Note: 2023 All Papers Everyday Science Mcqs. These Everyday Science MCQs taken from different exams were conducted in Pakistan in 2023.

 

1. The particles, atoms, or molecules in solids remain in motion and that motion is limited to?

A. Rotational Motion
B. Translational Motion
C. Vibrational Motion
D. Random Motion

Answer

Correct Answer: C. Vibration Motion

Detail about MCQs

The question is related to the motion of particles, atoms, or molecules in solids. In solids, the particles are closely packed together and have a regular, fixed arrangement. While they are not as free to move as particles in liquids or gases, they still exhibit some form of motion.
The motion of particles in solids is primarily limited to vibrational motion. This means that the particles vibrate around their fixed positions. They oscillate back and forth, but they do not change their overall positions within the solid structure. This vibrational motion is a result of the thermal energy present in the solid, causing the particles to move around their equilibrium positions.
So, the correct answer to the question is C. Vibrational Motion.

 

2. Protons and Neutrons are collectively known as?

A. Nucleotides
B. Nucleons
C. Isotopes
D. Positrons

Answer

Correct Answer: B. Nucleons

Detail about MCQs

The question is related to the constituents of an atomic nucleus. In an atomic nucleus, you find protons and neutrons. Here’s a breakdown of the terms:
Protons: Positively charged subatomic particles found in the nucleus of an atom.
Neutrons: Electrically neutral subatomic particles found in the nucleus of an atom.
Collectively, protons and neutrons are referred to as “nucleons.” The term “nucleon” is a general name for particles found in the nucleus of an atom, regardless of whether they are protons or neutrons.
So, the correct answer to the question is B. Nucleons.

 

3. Which of the following is not a magnetic material?

A. Paper Clip
B. Coin
C. Eraser
D. Iron mail

Answer

Correct Answer: C. Eraser

Detail about MCQs

An eraser is not a magnetic material. Among the options provided:
Paper Clip: Often made of steel, which is magnetic.
Coin: Depending on the composition, some coins may contain metals like nickel or iron, making them potentially magnetic.
Eraser: Typically made of non-magnetic materials such as rubber or synthetic polymers.
Iron Nail: Made of iron, which is magnetic.
So, the correct answer is Eraser.

 

4. An iron nail can be magnetized by?

A. Hammering on it
B. Heating on a High Flame
C. Heating on a very low flame
D. Passing an electric current around it

Answer

Correct Answer: D. Passing an electric current around it

Detail about MCQs

An iron nail can be magnetized by passing an electric current around it. This process is known as electromagnetic induction. When an electric current flows through a coil of wire, it creates a magnetic field. If an iron or steel object, such as a nail, is placed within this magnetic field, the nail can become magnetized. This phenomenon is the basis for creating electromagnets. Hammering or heating on a flame, either high or low, typically won’t result in permanent magnetization.

 

5. A force that stops things from moving easily is known as?

A. Fraction
B. Friction
C. Fission
D. Flocculation

Answer

Correct Answer: B. Friction

Detail about MCQs

Friction is a force that opposes the relative motion or tendency of such motion of two surfaces in contact. It acts parallel to the surfaces in contact and hinders the motion or sliding of one surface past the other. Friction is a result of the interactions between the atoms and molecules at the surfaces of objects. Friction plays a crucial role in everyday life, as it is responsible for phenomena like walking, driving, and many mechanical processes. While it can be a hindrance in some situations, it is also essential for enabling functions like walking and the operation of many machines. There are Several Types of Friction:
1. Static Friction
2. Kinetic Friction
3. Rolling Friction

 

6. The skydivers use parachutes to easily descend towards the earth because it?

A. Increases air resistance
B. Decreases air resistance
C. Decreases air fraction
D. Speeds Up

Answer

Correct Answer: A. Increases Air Resistance

Detail about MCQs

Skydivers use parachutes to easily descend towards the earth because parachutes increase air resistance. When a parachute is deployed, it opens up and captures a large amount of air. The increased surface area and air resistance slow down the descent of the skydiver, allowing for a controlled and safer landing. The parachute counteracts the force of gravity, providing a gradual descent instead of a rapid fall.

 

7. Amphibians lay their eggs in/on?

A. Land
B. Water
C. Nest
D. Mountains

Answer

Correct Answer: B. Water

Detail about MCQs

Amphibians typically lay their eggs in water. Most amphibians undergo a life cycle that involves an aquatic larval stage, and their eggs are adapted to develop in water. The aquatic environment is crucial for the development of amphibian eggs and larvae. Some species may lay eggs in ponds, lakes, or streams, depending on the specific amphibian species. After hatching, the larvae undergo metamorphosis and eventually transition to a terrestrial or semi-aquatic adult stage.

 

8. Organisms that eat all the dead and waste products and returning useful elements to soil and environment are known as?

A. Decomposers
B. Producers
C. Consumers
D. Propellers

Answer

Correct Answer: A. Decomposers

Detail about MCQs

Organisms that eat dead and waste products and return useful elements to the soil and environment are known as decomposers. These organisms play a crucial role in breaking down organic matter, such as dead plants and animals, into simpler substances. Decomposers include bacteria, fungi, and various types of insects, and they contribute to the recycling of nutrients in ecosystems.

 

9. Animals that eat only animals are called?

A. Insectivores
B. Carnivores
C. Omnivores
D. Herbivores

Answer

Correct Answer: B. Carnivores

Detail about MCQs

Animals that eat only animals are called carnivores. Carnivores primarily feed on the flesh or tissues of other animals as their main source of nutrition. They are part of the broader classification of consumers in ecological food webs, where they occupy a higher trophic level compared to herbivores and omnivores.

 

10. Materials from which current passes through are called?

A. Insulators
B. Conductors
C. Non-Conductors
D. Non-Metals

Answer

Correct Answer: B. Conductors

Detail about MCQs

Materials through which current can pass easily are called conductors. Conductors have low electrical resistance, allowing electric current to flow through them with minimal hindrance. Common examples of conductors include metals like copper, aluminum, and silver. In contrast, insulators (or non-conductors) are materials that do not allow electric current to pass through them easily and have high electrical resistance. Non-metals, such as rubber or plastic, are often insulators.

 

11. Which statement is incorrect about gas molecules?

A. Molecules are Widely Separated
B. Molecules have low attractive forces
C. Molecules free to move in any direction
D. Molecules do not collide with one another

Answer

Correct Answer: D. Molecule do not collide with one another

Detail about MCQs

The statement “Molecules do not collide with one another” is incorrect about gas molecules.
In reality, gas molecules are in constant motion, and collisions between them are common. The kinetic theory of gases explains that gas molecules move randomly and rapidly, and they collide with each other and the walls of their container. These collisions contribute to the pressure exerted by the gas. So, the correct statement is that molecules in a gas do indeed collide with each other.

 

12. The smallest particle of a compound, made up of group of atoms is known as?

A. Molecule
B. Mixture
C. Alloy
D. Isotope

Answer

Correct Answer: A. Molecule

Detail about MCQs

The smallest particle of a compound, made up of a group of atoms, is known as a molecule. A molecule is formed when two or more atoms chemically bond together. Compounds consist of molecules, and each molecule is made up of specific types and numbers of atoms, representing the chemical formula of the compound.

 

13. A method which is used to separate colored chemicals or substances is known as?

A. Filtration
B. Sublimation
C. Distillation
D. Paper Chromatography

Answer

Correct Answer: D. Paper Chromatography

Detail about MCQs

A method used to separate colored chemicals or substances is known as Paper Chromatography. In paper chromatography, a sample mixture is applied to a piece of paper, and the paper is then placed in a solvent. As the solvent moves through the paper, it carries the different components of the mixture along with it at different rates. This differential movement results in the separation of the components based on their solubility and affinity for the paper. The separated components appear as distinct bands or spots on the paper.

 

14. If the ratio of solute to solvent is low, the solution is said to be?

A. Supersaturated
B. Dilute
C. Saturated
D. Concentrated

Answer

Correct Answer: B. Dilute

Detail about MCQs

If the ratio of solute to solvent is low, the solution is said to be dilute. In a dilute solution, there is a relatively small amount of solute dissolved in a larger amount of solvent. The concentration of the solute is low compared to the solvent.

 

15. Our weight is carried by the pull of?

A. Stars
B. Magnet
C. Gravity
D. Electrostatic Force

Answer

Correct Answer: C. Gravity

Detail about MCQs

Our weight is carried by the pull of gravity. Gravity is the force of attraction between masses, and it is responsible for pulling objects with mass toward each other. On Earth, gravity is what gives us weight, as it pulls us towards the planet’s center. Gravity is a fundamental force in nature and plays a crucial role in the motion of celestial bodies, such as stars and planets.

 

16. If you move to the moon your weight will change because?

A. The pull of gravity is weaker there than on earth
B. The pull of gravity is stronger there than on earth
C. The pull of space is stronger than earth
D. The pull of sun is weaker than earth

Answer

Correct Answer: A. The pull of gravity is weaker there on Earth

Detail about MCQs

If you move to the Moon, your weight will change because the pull of gravity is weaker there than on Earth. The force of gravity depends on the mass of the celestial body and the distance from its center. The Moon is much smaller than Earth, so its gravitational pull at the surface is weaker. As a result, a person would weigh less on the Moon compared to their weight on Earth. However, it’s important to note that mass remains the same regardless of location, so your mass would be the same on the Moon as it is on Earth.

 

17. A type of simple machine which is used to move heavy objects up or down over a vertical height is known as?

A. Lever
B. Wedge
C. Inclined Plane
D. Fulerum

Answer

Correct Answer: C. Inclined Plane

Detail about MCQs

A type of simple machine used to move heavy objects up or down over a vertical height is known as an Inclined Plane. An inclined plane is a flat surface that is tilted at an angle to the horizontal, allowing objects to be moved up or down with less effort than lifting them straight up. Examples of inclined planes include ramps and staircases. Levers, wedges, and fulcrums are other types of simple machines, each with its own specific applications.

 

18. Which of the following food has high protein content?

A. Cow Milk
B. Apples
C. Eggs
D. Peanuts

Answer

Correct Answer: C. Eggs

Detail about MCQs

Among the options provided, eggs and peanuts are known for having high protein content:
1. Eggs: Eggs are an excellent source of high-quality protein. They contain all essential amino acids, making them a complete protein source.
2. Peanuts: Peanuts, and products made from peanuts like peanut butter, are also relatively high in protein. They are a good source of plant-based protein.
Cow milk and apples, while nutritious, are not as high in protein as eggs and peanuts.

 

19. Mental retardation in children is mainly caused by the deficiency of?

A. Copper
B. Magnesium
C. Iodine
D. Sodium

Answer

Correct Answer: C. Iodine

Detail about MCQs

Iodine deficiency during pregnancy is a known factor that can lead to severe developmental issues in children, including intellectual disabilities. Adequate levels of iodine are crucial for the proper functioning of the thyroid gland, and when a pregnant woman lacks sufficient iodine, it can result in conditions like cretinism. Cretinism is characterized by mental retardation, stunted growth, and other developmental delays in the affected child. Therefore, ensuring proper iodine intake, especially during pregnancy, is essential for supporting the healthy development of the fetal brain and preventing long-term cognitive impairments.

 

20. Which one among the following is not a chemical change?

A. Burning of Coal
B. Rusting of Iron
C. Melting of Ice
D. Photosynthesis

Answer

Correct Answer: C. Melting of Ice

Detail about MCQs

Melting of ice is a physical change, not a chemical change. In this process, ice changes from a solid state to a liquid state without undergoing a chemical reaction. The chemical composition of water remains the same during the phase change from ice to water. On the other hand:
A. Burning of Coal – Chemical Change: It involves the combustion of coal, resulting in the production of new substances like carbon dioxide and water vapor.
B. Rusting of Iron – Chemical Change: It is a process where iron reacts with oxygen and water to form iron oxide (rust), representing a chemical change.
D. Photosynthesis – Chemical Change: It is a complex biochemical process in plants where carbon dioxide and water are converted into glucose and oxygen through a series of chemical reactions.

 

21. Ozone Layer protects our earth from the harmful effects of sun’s?

A. Ultraviolet Rays
B. Infrared Rays
C. X-Ray
D. Gama Rays

Answer

Correct Answer: A. Ultraviolet Rays

Detail about MCQs

The ozone layer primarily protects the Earth from the harmful effects of the sun’s ultraviolet (UV) rays. Ultraviolet rays, particularly UV-B and UV-C, can have detrimental effects on living organisms, including humans, by causing skin damage, cataracts, and negatively impacting ecosystems. The ozone layer acts as a shield by absorbing and blocking a significant portion of these harmful UV rays from reaching the Earth’s surface.

 

22. Which statement is incorrect about chemical reactions?

A. Chemical Reactions Produce new Substance
B. Chemical Reactions occur with the absorption or emission of energy
C. Chemical reactions may be fast, moderate, or slow
D. States of matter does not change during chemical reaction

Answer

Correct Answer: D. States of matter does not change during chemical reaction

Detail about MCQs

The statement “States of matter do not change during a chemical reaction” is incorrect. In chemical reactions, one or more substances undergo a transformation, and this can involve changes in the physical state of matter. For example, a chemical reaction might involve the solidification of a liquid, the vaporization of a liquid to form a gas, or the dissolution of a solid in a liquid. The change in states of matter is indeed a possibility during chemical reactions.

 

23. The body system that controls and coordinates the function of all other organ systems is called?

A. Nervous System
B. Digestive System
C. Circular System
D. Excretory System

Answer

Correct Answer: A. Nervous System

Detail about MCQs

The body system that controls and coordinates the function of all other organ systems is the Nervous System. The nervous system includes the brain, spinal cord, and a network of nerves. It plays a crucial role in receiving and interpreting signals from various parts of the body, enabling communication between different organs and systems. This coordination allows the body to respond appropriately to internal and external stimuli, maintaining homeostasis and ensuring proper functioning of all organ systems.

 

24. The structure of brain is very similar to the structure of?

A. Almond
B. Walnut
C. Pistachios
D. Peanus

Answer

Correct Answer: B. Walnut

Detail about MCQs

The structure of the brain is often likened to the structure of a Walnut. This comparison is due to the convoluted and folded appearance of the brain’s outer layer, the cerebral cortex, which resembles the convoluted surface of a walnut. The intricate folding of the brain’s surface increases the surface area, allowing for a greater number of neurons and synapses, which are essential for complex cognitive functions.

 

25. When a liquid is placed in a container, the pressure applied to the fluid by the container is equal throughtout the container is the statement of?

A. Charle’s Law
B. Avogadro’s Law
C. Pascal’s Law
D. Graham’s Law

Answer

Correct Answer: C. Pascal’s Law

Detail about MCQs

The statement “When a liquid is placed in a container, the pressure applied to the fluid by the container is equal throughout the container” is an expression of Pascal’s Law. Pascal’s Law, also known as the principle of transmission of fluid-pressure, states that a change in pressure applied to an enclosed fluid is transmitted undiminished to all portions of the fluid and to the walls of its container.

 

26. A Unit of pressure equal to 1 Newton per square meter (N/m2) is known as?

A. Volt
B. Pascal
C. Joule
D. Henry

Answer

Correct Answer: B. Pascal

Detail about MCQs

A unit of pressure equal to 1 Newton per square meter (N/m²) is known as the Pascal (Pa). Therefore, option B, Pascal, is the correct answer. The unit Pascal (Pa) is named after Blaise Pascal, a French mathematician, physicist, and inventor. It is the SI (International System of Units) unit of pressure. One Pascal is equivalent to one Newton of force per square meter.

 

27. Which one among the following is not an example of pneumatic system?

A. Spray Gun
B. Bicycle Pump
C. Car Brake
D. Vacuum Cleaner

Answer

Correct Answer: C. Car Brake

Detail about MCQs

A car brake system typically uses hydraulic pressure rather than pneumatic pressure. Hydraulic systems use a non-compressible fluid (usually brake fluid) to transmit force and operate the braking mechanism. Pneumatic systems, on the other hand, use compressed air to transmit power. So, in the context of the given options, the car brake system is not an example of a pneumatic system. The other options (A. Spray Gun, B. Bicycle Pump) are indeed examples of pneumatic systems as they involve the use of compressed air.

 

28. Which metal has the highest electrical conductivity?

A. Copper
B. Aluminum
C. Tungsten
D. Iron

Answer

Correct Answer: A. Copper

Detail about MCQs

Copper has the highest electrical conductivity among the options provided. It is an excellent conductor of electricity, which makes it widely used in electrical wiring and various electrical components. Copper’s high electrical conductivity is due to its atomic structure and the ease with which electrons can move through its lattice, allowing for efficient electrical conduction.

 

29. Which one among the following is an example of decomposition reaction?

A. The Reaction of Sodium and Chlorine to Form Sodium Chloride
B. The Bunting of Coal to give Carbon Dioxide
C. The Formation of Hydrogen and Oxygen from Water
D. The Formation of Ammonia from Nitrogen and Hydrogen

Answer

Correct Answer: C. the Formation of Hydrogen and Oxygen from water

Detail about MCQs

C. The Formation of Hydrogen and Oxygen from Water
The formation of hydrogen and oxygen from water represents an example of a decomposition reaction. In this reaction, water (H₂O) is broken down into its constituent elements, hydrogen (H₂) and oxygen (O₂), through the process of decomposition. The balanced chemical equation for this reaction is:
2H2O→2H2+O2
This reaction is a type of decomposition reaction where a single compound breaks down into simpler substances.

 

30. The study of heat changes in chemical reaction is called?

A. Electrochemistry
B. Thermochemistry
C. Organic Chemistry
D. Biochemistry

Answer

Correct Answer: B. thermochemistry

Detail about MCQs

The study of heat changes in chemical reactions is called Thermochemistry. Thermochemistry is a branch of physical chemistry that deals with the relationship between heat changes and chemical reactions. It involves the measurement and calculation of heat changes in various chemical processes, including reactions and phase transitions.

 

31. The reaction which releases or gives off heat energy is called?

A. Exothermic Reaction
B. Endothermic Reaction
C. Isothermic Reaction
D. Indothermic Reaction

Answer

Correct Answer: A. Exothermic Reaction

Detail about MCQs

The reaction that releases or gives off heat energy is called an Exothermic Reaction. In exothermic reactions, energy is released to the surroundings in the form of heat. The term “exothermic” comes from the Greek words “exo,” meaning outside, and “therme,” meaning heat. Combustion reactions, such as the burning of fuel, are common examples of exothermic reactions.

 

32. The basic physical and functional unit of heredity is called?

A. Chromosomes
B. Gene
C. Cell
D. Cytoplasm

Answer

Correct Answer: B. Gene

Detail about MCQs

The basic physical and functional unit of heredity is called a gene. Genes are segments of DNA (deoxyribonucleic acid) that contain the instructions for building and maintaining the structures and functions of living organisms. Genes are located on chromosomes, which are thread-like structures found in the cell nucleus. The information encoded in genes is passed from one generation to the next during reproduction.

 

33. The molecular model of DNA which suggests the basic mechanism of DNA replication was proposed by?

A. James Watson and Francis Crick
B. Charles Darwin and G. Mendel
C. Woese and R. Franklin
D. M. Wilkins and J. Black

Answer

Correct Answer: A. James Watson and Francis Crick

Detail about MCQs

The molecular model of DNA that suggests the basic mechanism of DNA replication was proposed by James Watson and Francis Crick. They, along with contributions from Rosalind Franklin’s X-ray diffraction data, presented the double helix model of DNA in 1953, elucidating the structure of DNA and providing insights into its replication mechanism.

 

34. In the bacterial cell, the DNA is found floating in the?

A. Nucleus
B. Cytoplasm
C. Ectoplasm
D. Nucleoplasm

Answer

Correct Answer: B. Cytoplasm

Detail about MCQs

In bacterial cells, the DNA is found floating in the cytoplasm. Unlike eukaryotic cells, bacteria lack a membrane-bound nucleus. The genetic material, which is typically a single, circular DNA molecule in bacteria, is located in the cytoplasm, where various cellular processes, including replication and transcription, take place.

 

35. Convex Lenses are also known as?

A. Converging Lenses
B. Diverging Lenses
C. Deflecting Lenses
D. Reflecting Lenses

Answer

Correct Answer: A. Converging Lenses

Detail about MCQs

Convex lenses are also known as converging lenses. Convex lenses are thicker in the center than at the edges, and they converge light rays that are parallel to their principal axis. They are capable of bringing parallel rays of light to a focal point after refraction.

 

36. The light sensitive part of the eye is?

A. Cornea
B. Retina
C. Optic Nerve
D. Iris

Answer

Correct Answer: B. Retina

Detail about MCQs

The light-sensitive part of the eye is the Retina. The retina is a layer of tissue located at the back of the eye, lining the inner surface of the eyeball. It plays a crucial role in the process of vision by capturing and processing light.
The retina contains specialized cells called photoreceptors, which are of two main types: rods and cones. Rods are responsible for vision in low-light conditions and help with peripheral vision, while cones are responsible for color vision and visual acuity, especially in well-lit conditions.

 

37. Solar Panels contains solar cells which are called?

A. Photo-Voltaic Cells
B. Photo-Electric Cells
C. Photo-Nuclear Cells
D. Photo-Protic Cells

Answer

Correct Answer: A. Photo-Voltaic Cells

Detail about MCQs

Solar Cells/Photovoltaic Cells: These are the fundamental units of a solar panel. They are devices that convert sunlight directly into electricity through a phenomenon known as the photovoltaic effect. The most common material used in solar cells is silicon. When sunlight strikes the silicon atoms in the solar cell, it generates an electric current by freeing electrons from their atomic bonds. This flow of electrons creates an electric current that can be harnessed as usable electrical energy.

 

38. Who used telescope first time in the human history to observe Jupiter, Saturn and Venus?

A. Galileo-Galilei
B. Aristotle
C. AL-Beruni
D. Thomas Harriot

Answer

Correct Answer: A. Galileo-Galilie

Detail about MCQs

The credit for using a telescope to observe Jupiter, Saturn, and Venus for the first time in human history goes to Galileo Galilei. Galileo Galilei (1564–1642): Galileo was an Italian astronomer, physicist, mathematician, and philosopher. He is often referred to as the “father of observational astronomy,” and he made significant contributions to the understanding of the cosmos.
In 1609, Galileo heard about the invention of the telescope, a device that magnifies distant objects, and he decided to build his own. By the following year, in 1610, he had constructed a telescope with sufficient magnification to make groundbreaking astronomical observations.

 

39. Severe deficiency of Vitamin D results in ___?

A. Scurvy
B. Rickets
C. Night Blindness
D. None of These

Answer

Correct Answer: B. Rickets

Detail about MCQs

Severe deficiency of Vitamin D results in Rickets. Rickets is a condition characterized by the softening and weakening of bones in children, leading to deformities. Vitamin D is essential for the proper absorption of calcium and phosphorus in the body, and its deficiency can impair bone mineralization and growth, causing conditions like rickets. Scurvy is caused by a deficiency of Vitamin C, and night blindness is associated with a deficiency of Vitamin A.

 

40. The Sun is a ___?

A. Star
B. Planet
C. Asteroid
D. Moon

Answer

Correct Answer: A. Star

Detail about MCQs

The Sun is a Star. It is a G-type main-sequence star, commonly referred to as a yellow dwarf. The Sun is at the center of our solar system and serves as the primary source of energy for Earth. It is a massive ball of hot, ionized gas (plasma) that undergoes nuclear fusion in its core, converting hydrogen into helium and releasing a tremendous amount of energy in the process.

 

41. Undigested food is expelled from the human body through?

A. Liver
B. Spleen
C. Pancreas
D. Large Intestine

Answer

Correct Answer: D. Largest Intestine

Detail about MCQs

Undigested food is expelled from the human body through the Large Intestine. The large intestine, also known as the colon, plays a crucial role in the final stages of digestion and absorption of water and electrolytes. It receives undigested food material from the small intestine, absorbs water, and forms feces. The remaining undigested and unabsorbed material is then eliminated from the body through the rectum and anus during the process of defecation. The liver, spleen, and pancreas are involved in various aspects of digestion and metabolism but do not directly expel undigested food.

 

42. Which among the following is not the stage of mitosis?

A. Prophase
B. Metaphase
C. Interphase
D. Anaphase

Answer

Correct Answer: C. Interphase

Detail about MCQs

Interphase is not technically a stage of mitosis. It’s the phase in the cell cycle where the cell is not actively dividing. During interphase, the cell prepares for division, replicating its DNA and carrying out normal cellular functions. While it’s a crucial part of the cell cycle, it’s not considered one of the specific stages of mitosis.
So, the correct answer to the question is C. Interphase.

 

43. Brain is enclosed in a hard bony protective structure called?

A. Cranium
B. Calcium
C. Cronium
D. Chromium

Answer

Correct Answer: A. Cranium

Detail about MCQs

The brain is enclosed in a hard bony protective structure called the cranium. The cranium is also known as the skull, and it serves to protect the brain from external injuries. The cranium is made up of several bones that form a rigid structure around the brain, providing both structural support and protection.

 

44. The rental artery transports the blood to the?

A. Liver
B. Lungs
C. Kidneys
D. Spleen

Answer

Correct Answer: C. Kidneys

Detail about MCQs

The blood transported by the renal artery reaches the kidneys, where various processes such as filtration, reabsorption, and secretion take place.
The kidneys are vital organs that help regulate blood pressure, maintain electrolyte balance, and eliminate waste products from the body through urine formation.
So, in summary, the renal artery transports blood to the kidneys, and the correct answer is C. Kidneys.

 

45. Which gas among the following is a major greenhouse gas?

A. Hydrogen
B. Oxygen
C. Ammonia
D. Carbon Dioxide

Answer

Correct Answer: D. Carbon Dioxide

Detail about MCQs

Carbon dioxide is a major greenhouse gas. Human activities, such as burning fossil fuels (coal, oil, and natural gas), deforestation, and industrial processes, contribute to increased levels of carbon dioxide in the atmosphere. This enhanced concentration of CO2 is a significant driver of global warming and climate change.

 

46. The process in which acid is mixed with base, and then a salt and water are formed is called?

A. Combustion
B. Neutralization
C. Addition
D. Condensation

Answer

Correct Answer: B. Neutralization

Detail about MCQs

The process described in the question, where an acid is mixed with a base resulting in the formation of a salt and water, is called Neutralization. This is a chemical reaction between an acid and a base, and it results in the formation of a salt and water. The reaction can be represented as follows: acid+base→salt+wateracid+base→salt+water

 

47. Citric Acid is found in?

A. Lemon
B. Apples
C. Mangoes

D. Bananas

Answer

Correct Answer: A. Lemon

Detail about MCQs

Citric acid is abundant in lemons. It gives lemons their characteristic sour taste and is commonly used in cooking and food preparation. Lemon juice is a natural source of citric acid.

 

48. Which one among the following is the formula of glucose?

A. C6H2O
B. C12H6O12
C. C6H12O6
D. C12H12O12

Answer

Correct Answer: C. C6H12O6

Detail about MCQs

The correct formula for glucose is:
C. C6H12O6.
Glucose is a simple sugar and a monosaccharide. Its molecular formula is C6H12O6.
Each molecule of glucose consists of six carbon atoms (C6), twelve hydrogen atoms (H12), and six oxygen atoms (O6).

 

49. How many times a proton is heavier than an electron?

A. 1030
B. 1206
C. 1650
D. 1836

Answer

Correct Answer: D. 1836

Detail about MCQs

The mass of a proton is about 1836 times greater than the mass of an electron. This ratio is due to the significant difference in mass between the two subatomic particles. The mass of a proton is approximately 1.6726219×10−271.6726219×10−27 kilograms.
The mass of an electron is approximately 9.10938356×10−319.10938356×10−31 kilograms. To find the ratio, you can divide the mass of a proton by the mass of an electron: Mass of Proton/ Mass of Electron = 1.6726219×10−27/9.10938356×10-3 = 1836
So, a proton is about 1836 times heavier than an electron. This is a significant difference in mass between these two subatomic particles.

 

50. The power of combining of an atom with other atom to form molecule or compound is called?

A. Density
B. Valency
C. Electron Affinity
D. Electronegativity

Answer

Correct Answer: B. Valency

Detail about MCQs

The power of combining of an atom with another atom to form a molecule or compound is called Valency. Valency: Valency is a measure of an atom’s ability to form chemical bonds with other atoms. It determines how many bonds an atom can form to achieve a stable, full outer electron shell.

 

51. At higher altitude, the temperature and density of the air is?

A. Lower
B. Higher
C. Fixed
D. Constant

Answer

Correct Answer: A. Lower

Detail about MCQs

At higher altitudes, both temperature and air density decrease primarily due to changes in atmospheric pressure and the way Earth’s atmosphere responds to changes in elevation. Here’s an explanation: As air rises in the troposphere, it expands due to decreasing atmospheric pressure, resulting in adiabatic cooling. This leads to a temperature decrease at a rate of approximately 6.5 degrees Celsius per kilometer. Simultaneously, the lower temperature causes slower-moving air molecules, reducing collisions and lowering air density. The decrease in density is compounded by the lower pressure at higher altitudes, where fewer air molecules are present.

 

52. The distance between the optical centre and the principal focus is called?

A. Focus Length
B. Focal Length
C. Focus Point
D. Focal Point

Answer

Correct Answer: B. Focal Length

Detail about MCQs

The correct term for the distance between the optical centre and the principal focus in optics is:
B. Focal Length.
Focal length is a key parameter in optics, specifically in the context of lenses and mirrors.
For lenses, it is the distance between the lens’s optical center and its focal point.
For mirrors, it is the distance between the mirror’s surface and its focal point.
Focal length determines the degree of convergence or divergence of light and plays a crucial role in the formation of images by lenses and mirrors.
So, the correct answer to the question is B. Focal Length.

 

53. Which lens is used for the correction long-sightedness?

A. Convex Lens
B. Concave Lens
C. Compact Lens
D. None of these

Answer

Correct Answer: A. Convex Lens

Detail about MCQs

For the correction of long-sightedness, a Convex Lens is used. Long-sightedness, also known as hypermetropia, occurs when the light entering the eye focuses behind the retina instead of directly on it.
A convex lens converges light rays, bringing them together. This is beneficial for individuals with hypermetropia because it helps to focus the image correctly onto the retina.

 

54. A branch of Physics that deals with controlling of electrical energy is called?

A. Hydraulics
B. Electronics
C. Mechanics
D. Pneumatics

Answer

Correct Answer: B. Electronics

Detail about MCQs

The branch of physics that deals with the control of electrical energy is called Electronics. Electronics is a branch of physics and engineering that focuses on the study and application of electrical circuits and devices. It involves the design, analysis, and application of electronic circuits that use active electrical components such as transistors, diodes, and integrated circuits to control the flow of electrical current. Electronics plays a crucial role in various technologies, including computers, communication systems, medical devices, and many other electrical systems.So, the correct answer to the question is B. Electronics.

 

55. The current which flows in one direction is called?

A. Alternating Current
B. Direct Current
C. Fixed Current
D. Variable Current

Answer

Correct Answer: B. Direct Current

Detail about MCQs

Direction of Flow: In direct current, the electric charge flows consistently in one direction through the conductor.
Source: DC is often produced by batteries, fuel cells, and solar cells, where there is a constant potential difference (voltage) causing the current to flow in a single direction.
Applications: DC is commonly used in electronic devices, such as laptops, cell phones, and most electronic gadgets, as well as in certain power transmission systems.

 

56. How many component colors formed while light split?

A. Three
B. Five
C. Seven
D. None of these

Answer

Correct Answer: C. Seven

Detail about MCQs

When light is split, it can be separated into its component colors through a process called dispersion. The number of component colors that are typically observed when light is split is:
C. Seven
The seven colors of the visible spectrum, often remembered by the acronym ROYGBIV, are red, orange, yellow, green, blue, indigo, and violet. These colors result from the dispersion of light through a prism or other similar optical elements.

 

57. Our normal body temperature is?

A. 33.6 F
B. 98.6 F
C. 112.6 F
D. 212.7 F

Answer

Correct Answer: B. 98.6 F

Detail about MCQs

The average normal body temperature is often considered to be 98.6°F (37°C). However, it’s essential to note that individual variations exist, and normal body temperature can range slightly above or below this average. Body temperature is usually measured orally, but temperatures can also be measured in other areas of the body, such as the rectum or armpit.

 

58. What is the color of phenolphthalein indicator in basic medium?

A. Orange
B. Yellow
C. Blue
D. Pink

Answer

Correct Answer: D. Pink

Detail about MCQs

Color of Phenolphthalein in Basic Medium:
In a basic solution, phenolphthalein turns Pink. Phenolphthalein is colorless in acidic solutions and turns pink or magenta in basic or alkaline solutions. The color change occurs in the pH range of approximately 8.2 to 10, indicating the transition from acidic to basic conditions.

 

59. Which of the following is a micro nutrient?

A. Carbohydrate
B. Protein
C. Fats
D. Calcium

Answer

Correct Answer: D. Calcium

Detail about MCQs

Among the options provided, Calcium is considered a micronutrient. Micronutrients are essential nutrients required by the body in relatively smaller amounts compared to macronutrients (carbohydrates, proteins, and fats).
Calcium is a micronutrient that plays a crucial role in various physiological processes, including bone and teeth formation, blood clotting, muscle function, and nerve transmission.

 

60. Which of the following is the source of purest water in nature?

A. River
B. Rain
C. Spring
D. Well

Answer

Correct Answer: B. Rain

Detail about MCQs

The source of the purest water in nature is generally considered to be Rainwater. Rainwater is formed by the process of evaporation, condensation, and precipitation. As water evaporates from the Earth’s surface, it leaves impurities behind. When it condenses into clouds and falls as rain, it is relatively pure.
However, the purity of rainwater can be influenced by environmental factors. For example, pollutants in the atmosphere or contaminants on surfaces can affect the quality of rainwater.

 

61. Which of the following is the viral infection?

A. Malaria
B. Measles
C. Tuberculosis
D. Whooping Cough

Answer

Correct Answer: B. Measles

Detail about MCQs

Among the options provided, Measles is a viral infection. Measles: Measles is a highly contagious viral infection caused by the measles virus (MeV). It primarily affects children and is characterized by symptoms such as high fever, cough, runny nose, and a characteristic rash.

 

62. In one of muscles fatigue, which of the following vitamin should be taken?

A. Vitamin A
B. Vitamin B
C. Vitamin C
D. Vitamin D

Answer

Correct Answer: B. Vitamin B

Detail about MCQs

In the context of muscle fatigue, Vitamin B is often associated with energy metabolism and overall muscle function. Vitamin B Complex: The B vitamins, collectively known as the B-complex vitamins, play crucial roles in energy metabolism, including the breakdown of carbohydrates into glucose, which is used for energy. They are also involved in the maintenance of nerve cells and the production of red blood cells.
B Vitamins for Muscles: Proper muscle function requires adequate levels of B vitamins, especially B1 (thiamine), B2 (riboflavin), B3 (niacin), B5 (pantothenic acid), B6 (pyridoxine), B7 (biotin), and B12 (cobalamin). These vitamins are involved in processes that contribute to energy production and the maintenance of muscle tissue.

 

63. Which of the following is correct about schedule of BCG vaccination?

A. Twelve Month and Above
B. Eighteen years and Above
C. None Months
D. At Birth

Answer

Correct Answer: D. At Birth

Detail about MCQs

The correct schedule for BCG (Bacillus Calmette-Guérin) vaccination varies by country and healthcare guidelines. However, a common schedule is to administer the BCG vaccine shortly after birth.
Correct Answer: At Birth. BCG vaccination is typically given in the first few days or weeks after birth. This early vaccination aims to provide protection against tuberculosis (TB), particularly in regions where TB is prevalent. The vaccine is often administered intradermally (under the skin), usually on the upper arm.

 

64. The result through which food is directly given in the veins is called?

A. Parenteral
B. Intravenous
C. Oral
D. External

Answer

Correct Answer: A. Parenteral

Detail about MCQs

The result through which food is directly given in the veins is called Parenteral Nutrition. Parenteral Nutrition: This is a method of feeding that involves providing nutrients directly into the bloodstream, bypassing the digestive system. It is used when a person cannot or should not receive nutrition through the gastrointestinal tract.
Intravenous (IV): Intravenous refers to the administration of substances directly into a vein. In the context of parenteral nutrition, nutrients are delivered intravenously.

 

65. A person who has had a rental transplant should regulate the intake of?

A. Carbohydrates
B. Fibers
C. Proteins
D. Fats

Answer

Correct Answer: C. Proteins

Detail about MCQs

A person who has had a renal (kidney) transplant should regulate the intake of several nutrients, with a particular focus on Proteins.
Proteins:
After a renal transplant, there is often a need to monitor protein intake. This is because excessive protein consumption can increase the workload on the kidneys. On the other hand, insufficient protein intake can lead to malnutrition. Therefore, the quantity and quality of protein in the diet are often carefully managed in individuals who have undergone renal transplantation. Fiber: Fiber is typically important for digestive health, but it might be necessary to manage fiber intake based on the individual’s specific health needs.

 

66. Following are the disease due to presence of infective host except?

A. Genetic Disorder
B. Hepatitis
C. Typhoid
D. Dysentery

Answer

Correct Answer: A. Genetic Disorder

Detail about MCQs

One example of a disease not caused by an infective host is “Genetic Disorders.” Genetic disorders are conditions that result from abnormalities in an individual’s DNA, and they are not caused by infectious agents such as bacteria, viruses, or parasites. Instead, genetic disorders are typically inherited or arise due to mutations in an individual’s genes. Examples include cystic fibrosis, Huntington’s disease, and sickle cell anemia.

 

67. Following are the steps in rapid sand filter except?

A. Coagulation
B. Rapid Molding
C. Filter Cleaning
D. Sedimentation

Answer

Correct Answer: B. Rapid Molding

Detail about MCQs

The term “Rapid Molding” does not typically relate to the steps in a rapid sand filter. The correct term related to the process of filtering in water treatment is “Rapid Sand Filtration.” So, the correct answer to the question would be “Rapid Molding.” The other steps mentioned—Coagulation, Sedimentation, and Filter Cleaning—are indeed associated with the process of water treatment using a rapid sand filter.

 

68. Influenza Pandemic occurs after every 7-10 years. This kind of disease distribution in time is known as?

A. Secular Trend
B. Short Time Fluctuation
C. Cyclical Trend
D. Seasonal Trend

Answer

Correct Answer: C. Cyclical Trend

Detail about MCQs

The pattern of occurrence described, where an influenza pandemic occurs every 7-10 years, is indicative of a “Cyclical Trend.” A cyclical trend refers to a repeating pattern or cycle of events over time. In this context, the occurrence of influenza pandemics at regular intervals represents a cyclical pattern rather than a secular trend (long-term trend), short-time fluctuation, or a seasonal trend.

 

69. Which poisoning retards Purification:

A. Arsenic
B. Mercury
C. Lead
D. Phosphorus

Answer

Correct Answer: A. Arsenic

Detail about MCQs

The element that is particularly known for retarding purification is Arsenic. Arsenic contamination can pose challenges in water purification processes, making it difficult to remove through conventional methods and potentially impacting the quality of purified water.

 

70. The route through which the food is directly introduced in the stomach or intestines, is called?

A. Oral
B. External
C. Parenteral
D. Exits Semendral

Answer

Correct Answer: A. Oral

Detail about MCQs

The route through which food is directly introduced into the stomach or intestines is called “oral.” Oral refers to anything related to the mouth or the act of taking in food through the mouth. The other options are not related to the process of introducing food into the digestive system.

 

71. To overcome diabetics mellitus, a person can increase the intake of ___ and reduce the intake of ___?

A. Carbohydrates, Protein
B. Carbohydrates, Protein
C. Fats, Carbohydrates
D. Proteins, Fats

Answer

Correct Answer: C. Fats, Carbohydrates

Detail about MCQs

To manage diabetes mellitus, a person can generally benefit from:
1. Reducing the intake of carbohydrates: Carbohydrates directly impact blood sugar levels, so managing their intake, especially refined carbohydrates, can help control blood glucose levels.
2. Increasing the intake of fiber-rich carbohydrates: While reducing overall carbohydrate intake, increasing the consumption of complex carbohydrates that are high in fiber, such as whole grains and vegetables, can be beneficial for people with diabetes. So, the correct answer from the options you provided is: Carbohydrates, Fats

 

72. A Person who is suffering from hypertension should cut down on?

A. Potassium
B. Calcium
C. Magnesium
D. Sodium

Answer

Correct Answer: D. Sodium

Detail about MCQs

A person suffering from hypertension (high blood pressure) should typically cut down on sodium intake. High sodium levels can contribute to elevated blood pressure. Therefore, reducing salt (which is a major source of sodium) in the diet is often recommended for individuals with hypertension.

 

73. Which of the following bone is classified as “Short Bone”?

A. Mandbile
B. Cranium
C. Carpals
D. Femur

Answer

Correct Answer: C. Carpals

Detail about MCQs

Among the options provided, the bone classified as a “Short Bone” is the Carpals. Carpals are the bones found in the human wrist and are considered short bones. Short bones are typically cube-shaped or roughly equal in length, width, and thickness. They provide stability and support, and their compact structure distinguishes them from long and irregular bones.

 

74. The Sternum meant to protect which of the following organ?

A. Liver
B. Brain
C. Lungs
D. Heart

Answer

Correct Answer: D. Heart

Detail about MCQs

The Sternum is meant to protect the Heart. The sternum, or breastbone, is a flat bone located in the center of the chest and serves as the attachment point for the ribs. It forms the front part of the rib cage, providing protection to vital organs such as the heart and a portion of the lungs.

 

75. Which of the following blood cells play important role in blood clotting?

A. Neurophils
B. Thrombocytes
C. Leucocytes
D. Erythrocytes

Answer

Correct Answer: B. Thrombocytes

Detail about MCQs

The blood cells that play an important role in blood clotting are Thrombocytes, which are also commonly known as platelets. Platelets are involved in the coagulation process, forming blood clots to prevent excessive bleeding when there is damage to blood vessels. They adhere to the site of injury and release substances that initiate the clotting cascade, leading to the formation of a stable blood clot.

 

76. Serum differs from blood as is lacks?

A. Antigenes
B. Antibodies
C. Clotting Factors
D. Albumin

Answer

Correct Answer: C. Clotting Factors

Detail about MCQs

Serum differs from blood because it lacks Clotting Factors. Serum is the liquid component of blood that remains after blood has clotted. During the clotting process, blood forms a clot to prevent excessive bleeding. Clotting factors are proteins involved in this coagulation process. Since serum is obtained after clotting, it does not contain clotting factors, while plasma (the liquid portion of blood before clotting) contains clotting factors.

 

77. The life span of RBCs is ____?

A. 90 Days
B. 100 Days
C. 110 Days
D. 120 Days

Answer

Correct Answer: D. 120 Days

Detail about MCQs

The typical life span of red blood cells (RBCs) is around 120 days. After this period, they are removed from circulation and broken down, primarily in the spleen and liver. This process is part of the normal life cycle of red blood cells, and the body continually produces new red blood cells to replace the old ones. After the production of new red blood cells, the old ones are removed from circulation and broken down through a process called hemolysis. This breakdown primarily occurs in the spleen and liver. The process of recycling and eliminating old red blood cell components is essential for maintaining the balance of blood cell populations in the body.

 

78. What is the name of iron-containing protein that gives red colour to the blood?

A. Pyrite
B. Hemoglobin
C. Myoglobin
D. Homocysteire

Answer

Correct Answer: B. Hemoglobin

Detail about MCQs

The iron-containing protein that gives red color to the blood is Hemoglobin. Hemoglobin is a crucial component of red blood cells and is responsible for transporting oxygen from the lungs to the tissues and carbon dioxide from the tissues back to the lungs. The iron in hemoglobin binds with oxygen, giving blood its characteristic red color. Myoglobin is another iron-containing protein, but it is found in muscle cells and is involved in oxygen storage within muscles, not in blood. Pyrite and homocysteire are not related to the oxygen-carrying function of blood.

 

79. The percentage of daily total calories obtained from carbohydrates should be?

A. 50-60%
B. 20-30%
C. 15-20%
D. 5-10%

Answer

Correct Answer: A. 50% – 60%

Detail about MCQs

The recommended percentage of daily total calories obtained from carbohydrates can vary based on individual needs and dietary preferences. However, a commonly suggested range by health authorities, including the Dietary Guidelines for Americans, is approximately 45-65% of total daily calories. If we were to choose the closest option, it would be 50-60%. This range falls within the general guideline for the percentage of daily calories obtained from carbohydrates for many individuals. Keep in mind that individual dietary requirements may vary.

 

80. Which of the following bone is classified as “long bone”?

A. Ulna
B. Ribs
C. Skull
D. Mandible

Answer

Correct Answer: A. Ulna

Detail about MCQs

Among the options provided, the bone classified as a “long bone” is the Ulna. The ulna is one of the two long bones in the forearm, with the other being the radius. Long bones, such as the ulna, are characterized by their elongated shape and include bones like the femur, humerus, and tibia. These bones play a crucial role in support, movement, and blood cell formation.

 

81. Determinants of disease means?

A. Agent, Host and Environment
B. Case, Carrier and Reservoir
C. Rate, Ratio and Proportions
D. Time Place and person

Answer

Correct Answer: A. Agent, Host and Environment

Detail about MCQs

Determinants of disease refer to the factors that contribute to the occurrence, distribution, and control of diseases. Among the options provided, the widely recognized framework for understanding the determinants of disease is captured by the phrase “Agent, Host, and Environment.” This framework emphasizes the interaction between the agent (causative factor), the host (individual or population affected), and the environment (surrounding conditions). So, the correct answer is: Agent, Host, Environment.

 

82. Incubation Period of Influenza is?

A. 1 to 2 Days
B. 3 to 5 Days
C. 4 to 6 Days
D. 8 to 10 Days

Answer

Correct Answer: A. 1 to 2 Days

Detail about MCQs

The incubation period of influenza, which is the time between exposure to the virus and the onset of symptoms, is typically 1 to 4 days, with an average of about 2 days. Symptoms of influenza usually begin around 2 days after being infected by someone who has the virus. Symptoms include: sudden onset of fever. cough (usually dry).

 

83. The term Light year refers to:

A. Time that earth takes to complete one revolution around the Sun
B. Distance of earth from the sun at which intensity of light is maximum
C. Speed of light expressed in miles per year
D. Unit of Distance

Answer

Correct Answer: D. Unit of Distance

Detail about MCQs

The term Light year refers to: Unit Distance
A light-year is a unit of distance, not time. It represents the distance that light travels in one year in the vacuum of space, and it is used to measure astronomical distances on a cosmic scale. Light travels at an incredibly fast speed of about 186,282 miles (299,792 kilometers) per second, so in one year, it covers a vast distance of approximately 5.88 trillion miles (9.46 trillion kilometers).

 

84. Why does the sky appear blue?

A. Due to scattering of light from atmosphere
B. Due to color of cans in the atmosphere
C. Due to the reflection from Earth’s Surface
D. None of these

Answer

Correct Answer: A. Due to scattering of light from atmosphere

Detail about MCQs

The sky appears blue primarily due to the scattering of sunlight by the Earth’s atmosphere. This phenomenon is known as Rayleigh scattering.
Scattering of Light: The Earth’s atmosphere is composed of molecules and small particles. When sunlight enters the atmosphere, it interacts with these particles. The shorter wavelengths of light, such as blue and violet, are scattered more easily than the longer wavelengths, like red and yellow.

 

85. The extraction of metal from the ore is done by “Smelting” which involves:

A. Heating and Chemical Reduction
B. Heating and Oxidation
C. Heating and Electrolysis
D. None of these

Answer

Correct Answer: A. Heating and Chemical Reduction

Detail about MCQs

The extraction of metal from the ore is done by “Smelting,” which involves: Heating and Chemical Reduction
Smelting is a process where a metal ore is heated strongly in the presence of a reducing agent, such as carbon, to obtain the metal. During smelting, the metal oxide in the ore is reduced to the metal, and the process often involves the removal of impurities as well. This method is commonly used for extracting metals like iron, copper, lead, and tin from their ores.

 

86. The hardness of a hammer made of aluminum is due to the presence of:

A. Ionic Bond
B. Covalent Bond
C. Metallic Bond
D. None of these

Answer

Correct Answer: C. Metallic Bond

Detail about MCQs

The hardness of a hammer made of aluminum is due to the presence of Metallic Bond.
In metallic bonding, metal atoms share electrons and form a “sea of electrons” that move freely throughout the structure. This electron delocalization contributes to the characteristic properties of metals, such as electrical conductivity and malleability. The presence of metallic bonds allows metals like aluminum to have hardness and strength, making them suitable for applications like hammer construction.

 

87. In which layer of the atmosphere are most of the clouds formed?

A. Mesosphere
B. Troposphere
C. Stratosphere
D. None of these

Answer

Correct Answer: B. Troposhpere

Detail about MCQs

Most of the clouds are formed in the Troposphere, which is the lowest layer of Earth’s atmosphere. The Troposphere extends from the Earth’s surface up to an average altitude of about 8 to 15 kilometers (5 to 9 miles), depending on the location and season. This layer contains the majority of Earth’s weather phenomena, including clouds, because it is where most of the water vapor is concentrated, and temperature decreases with altitude. The cooling of air as it rises in the troposphere leads to the condensation of water vapor into visible clouds.

 

88. Biosphere is defined as:

A. Part of the earth, water and atmosphere inhabited by living organism
B. Part of Soil inhabited by animals and Plants
C. Atmosphere in which life exists
D. None of these

Answer

Correct Answer: A. Part of the Earth, Water and Atmosphere inhabited by Living Organism

Detail about MCQs

Biosphere is defined as:
Part of the earth, water, and atmosphere inhabited by living organisms.
The biosphere encompasses all regions of the Earth where living organisms exist, including the surface of the land, bodies of water, and the atmosphere where life is supported. It is a dynamic system that includes various ecosystems and supports a wide diversity of life forms.

 

89. Malaria, Polio, Dengue fever and influenza are example of:

A. Deficiency Diseases
B. Infectious Diseases
C. Physiological Diseases
D. None of these

Answer

Correct Answer: B. Infectious Disease

Detail about MCQs

Malaria, Polio, Dengue fever, and influenza are examples of Infectious Diseases. Infectious diseases are caused by pathogenic microorganisms, such as bacteria, viruses, parasites, or fungi, and they can be transmitted from one person to another or from other sources. These diseases are often characterized by the invasion and multiplication of these pathogens in the body, leading to various symptoms and health issues.

 

90. What information about an earthquake defines its size?

A. Magnitude
B. Depth of the Epicenter
C. Energy Released
D. All of these

Answer

Correct Answer: A. Magnitude

Detail about MCQs

The information about an earthquake that defines its size is its Magnitude. Magnitude is a measure of the energy released at the source of the earthquake. It is a logarithmic scale, meaning that each whole number increase in magnitude represents a tenfold increase in measured amplitude of the seismic waves and roughly 31.6 times more energy release.

 

91. The fluid most of blood is known as?

A. Blood Cell
B. Platelets
C. Plasma
D. None of these

Answer

Correct Answer: C. Plasma

Detail about MCQs

The fluid component of blood is known as Plasma. Blood is composed of red blood cells, white blood cells, platelets, and plasma. Plasma is the liquid portion of blood that makes up about 55% of the total blood volume. It is a yellowish fluid that consists of water, electrolytes, proteins, hormones, and waste products. Plasma plays a crucial role in transporting cells, nutrients, hormones, and waste products throughout the body.

 

92. Name the hardest part of human body?

A. Enamel of Teeth
B. Skull of Head
C. Thumb Nails
D. Chest Bone

Answer

Correct Answer: A. Enamel of Teeth

Detail about MCQs

The hardest part of the human body is considered to be the enamel of teeth. Tooth enamel is the outermost layer that covers the crown of the tooth, and it is composed primarily of hydroxyapatite, a crystalline structure that makes it extremely hard and durable. Enamel plays a crucial role in protecting the teeth from wear and decay.

 

93. Study of development of human race is known as?

A. Anthropology
B. Entomology
C. Eugenics
D. Cryptology

Answer

Correct Answer: A. Anthropology

Detail about MCQs

The study of the development of the human race is known as Anthropology. Anthropology is a broad field that encompasses the study of human societies, cultures, languages, and physical development, including the evolution and development of the human species. It is divided into cultural anthropology, archaeology, linguistic anthropology, and physical (biological) anthropology, with each subfield addressing different aspects of human existence and development.

 

94. What are the celestial bodies Ceres, Pallas, Juno and Vesta?

A. Constellations
B. Stars
C. Asteroids
D. Galaxies

Answer

Correct Answer: C. Asteroids

Detail about MCQs

Ceres, Pallas, Juno, and Vesta are asteroids. They are part of the asteroid belt, a region of space located between the orbits of Mars and Jupiter, where numerous small, rocky bodies orbit the Sun. These objects are remnants from the early formation of the solar system and are distinct from stars, constellations, and galaxies. Each of these asteroids is relatively large compared to others in the belt and has been studied by astronomers to learn more about the early solar system.

 

95. What does a Thermostat do?

A. Switches off Electrical Appliance
B. Measures Temperature
C. Rotates Fans
D. Regulation of Temperature

Answer

Correct Answer: D. Regulation of Temperature

Detail about MCQs

A thermostat is a device that is used to regulate temperature. It is commonly used in heating, ventilation, and air conditioning (HVAC) systems to maintain a set temperature by controlling the operation of a heating or cooling device. Thermostats can sense the current temperature and, based on the user-set temperature, activate or deactivate the heating or cooling system to achieve the desired temperature level in a space. So, the correct option is “Regulates Temperature.”

 

96. What is the common name for the condition myopia?

A. Shortsightedness
B. Double Vision
C. Colour Blindness
D. Weak Eye Nerve

Answer

Correct Answer: A. Shortsightedness

Detail about MCQs

The common name for the condition myopia is Shortsightedness. Myopia is a refractive error of the eye where close objects are seen clearly, but distant objects appear blurry. It occurs when the eyeball is too long or the cornea has too much curvature, causing light entering the eye to focus in front of the retina instead of on it. Shortsightedness is a colloquial term often used to describe this condition.

 

97. While going towards the center of the earth, the weight of a body shall?

A. Increase
B. Decrease
C. Remain Same
D. Be Infinite

Answer

Correct Answer: B. Decrease

Detail about MCQs

While going towards the centre of the earth, the weight of a body shall decrease. This is because the distance from the centre of the earth reduces

 

98. Which is the green house gas among the following?
A. Carbon Dioxide
B. Methane
C. Nitrous Oxide
D. All of these

Answer

Correct Answer: D. All of these

Detail about MCQs

Among the options provided, all three are greenhouse gases. Therefore, the correct answer is All of these.
Carbon Dioxide (CO2): This is a well-known greenhouse gas and is a significant contributor to the greenhouse effect.
Methane (CH4): Methane is another potent greenhouse gas, and its impact on trapping heat in the atmosphere is more potent than carbon dioxide, although it has a shorter atmospheric lifetime.
Nitrous Oxide (N2O): Nitrous oxide is also a greenhouse gas, though its contribution to the greenhouse effect is less compared to carbon dioxide and methane. All three gases contribute to the greenhouse effect, which leads to the warming of the Earth’s atmosphere.

 

99. Which one is not a vestigial organ of human being?

A. Appendix
B. Coccys
C. Eyelids
D. All of these

Answer

Correct Answer: C. Eyelids

Detail about MCQs

The structure that is not considered a vestigial organ in humans is the Eyelids. Vestigial organs are evolutionary remnants that have lost their original function through the course of evolution.
The appendix and coccyx (tailbone) are often considered vestigial:
• Appendix: The appendix is believed to be a vestigial structure with a reduced or unclear function in modern humans.
• Coccyx: The coccyx is considered a vestigial structure, believed to be a remnant of a tail that our distant ancestors once had. On the other hand, eyelids are functional structures that play a crucial role in protecting and moisturizing the eyes. They are not considered vestigial.

 

100. Work of Pituitary gland in Human body?

A. Controls Several other hormones glands
B. Remove wastes and extra fluid
C. Maintaining blood Pressure
D. None of these

Answer

Correct Answer: A. Control Several other Hormones Glands

Detail about MCQs

The correct statement is: Controls Several other hormones glands.
The pituitary gland, located at the base of the brain, is often referred to as the “master gland” because it plays a central role in regulating various other endocrine glands throughout the body. It produces and releases hormones that control the activities of several other hormone-secreting glands, such as the thyroid, adrenal glands, and reproductive glands. These hormones are essential for the proper functioning and coordination of various physiological processes in the body.

 

101. During winter in cold countries, the ___ is mixed to melt the ice on the ice roads?

A. Salt
B. Chorine
C. Carbon Dioxide
D. Water

Answer

Correct Answer: A. Salt

Detail about MCQs

During winter in cold countries, salt is commonly mixed with ice on roads to melt the ice. Salt lowers the freezing point of water, and when spread on icy surfaces, it helps to prevent the formation of ice or melt existing ice by turning it into a brine with a lower freezing point. This process makes the roads safer for driving during icy conditions.

 

102. The lifespan of White Blood Cells is ___?

A. 1-5 Days
B. 3-7 Days
C. 4-8 Days
D. 5-21 Days

Answer

Correct Answer: D. 5-21 Days

Detail about MCQs

White blood cells are also called leucocytes. They are irregular and colorless cells with a nucleus. They protect the body from infections and foreign particles. The lifespan of WBC is about 5 to 21 Days. The lifespan of white blood cells (WBCs) can vary depending on the specific type of white blood cell. 5 to 21 days, is correct for some types of white blood cells, particularly lymphocytes.

 

103. Long Sightedness defect could be corrected by using ___ lens:

A. Concave
B. Convex
C. Diverging
D. None of these

Answer

Correct Answer: B. Convex

Detail about MCQs

Long-sightedness, also known as hyperopia, can be corrected by using B. Convex lenses.
Hyperopia is a refractive error where the eye focuses light behind the retina instead of directly on it, causing distant objects to appear clearer than close objects.
A convex lens is used to correct this condition by converging incoming light rays before they reach the eye, allowing for proper focusing on the retina.

 

104. Radioactivity was discovered by ____?

A. Kelvin
B. Thomson
C. Rutherford
D. Becquerel

Answer

Correct Answer: D. Becquerel

Detail about MCQs

Radioactivity was discovered by Henri Becquerel. In 1896, Becquerel observed that certain uranium salts emitted rays that could expose photographic plates. This accidental discovery marked the beginning of the study of radioactivity, leading to further investigations by scientists such as Marie and Pierre Curie and Ernest Rutherford, who made significant contributions to the understanding of radioactive elements and their properties.

 

105. The gas used in a refrigerator to cool water is ___:

A. Nitrogen
B. Carbon
C. Methane
D. Tetrafluoroethane

Answer

Correct Answer: D. Tetrafluoroethane

Detail about MCQs

The gas commonly used in a refrigerator to cool water is Tetrafluoroethane (often known by its trade name R-134a). Tetrafluoroethane is a hydrofluorocarbon (HFC) and is commonly used as a refrigerant in modern refrigeration and air conditioning systems. It is chosen for its thermodynamic properties and its lower impact on the environment compared to some older refrigerants like chlorofluorocarbons (CFCs).

 

106. Each day human body breathes in ___ liters of Air:

A. 5,000 to 10,000
B. 10,000 to 15,000
C. 15,000 to 25,000
D. 20,000 to 25000

Answer

Correct Answer: C. 15,000 to 25,000

Detail about MCQs

Each day, the human body typically breathes in approximately 15,000 to 25,000 liters of air. The exact amount can vary depending on factors such as respiratory rate, physical activity, and individual differences. The provided range accounts for normal breathing patterns and variations.

 

107. 1 Nanometer is equal to ___?

A. 10^-3 meter
B. 10^-4 meter
C. 104 meter
D. 10-9 meter

Answer

Correct Answer: D. 10^-9 meter

Detail about MCQs

1 Nanometer is equal to 10^-9 meter. The prefix “nano-” denotes one billionth of a unit, so a nanometer is one billionth of a meter.

 

108. Meteorology is the study of ___?

A. Seasons
B. Atmosphere
C. Air and Seasons
D. Winds and clouds

Answer

Correct Answer: B. Atmosphere

Detail about MCQs

Meteorology is the study of the atmosphere. It involves the examination of atmospheric phenomena, weather patterns, climate, and the processes that occur in the Earth’s atmosphere. While meteorology encompasses the study of various atmospheric elements, it is not limited solely to air and seasons but includes a broader understanding of atmospheric dynamics.

 

109. Diamond is an allotropic form of ___?

A. Carbon
B. Hydrogen
C. Nitrogen
D. Silicon

Answer

Correct Answer: A. Carbon

Detail about MCQs

Diamond is an allotropic form of carbon. In the context of chemistry, allotropes are different structural forms of the same element, and carbon exhibits several allotropes, with diamond being one of them. Another well-known allotrope of carbon is graphite.

 

110. The largest cell in the human body?

A. Ovum
B. Mycoplasma
C. Nerve
D. None of these

Answer

Correct Answer: A. Ovum

Detail about MCQs

The largest cell in the human body is the ovum or egg cell. The ovum is the female reproductive cell and is notably larger than other cells in the human body. Mycoplasma is a type of bacteria, and nerve cells (neurons) are generally much smaller than egg cells. Therefore, the correct answer is Ovum.

 

111. The dearest substance on the earth is?

A. Platinum
B. Copper
C. Steel
D. Cerium

Answer

Correct Answer: A. Platinum

Detail about MCQs

Platinum is considered one of the more valuable and precious metals. Platinum is rarer than gold and has various industrial uses, contributing to its high value. Keep in mind that market prices for precious metals can fluctuate over time.

 

112. The salinity of seawater is determined by the amount of common salt (Sodium Chloride) ___ of seawater.

A. 1 gram
B. 10 grams
C. 1 kg
D. 10 kg

Answer

Correct Answer: C. 1kg

Detail about MCQs

The salinity of seawater is typically expressed as the amount of common salt (sodium chloride) dissolved in one kilogram (kg) of seawater. Therefore, the correct option is 1 kg. Salinity is often measured in parts per thousand (ppt) or practical salinity units (PSU), which are roughly equivalent to the grams of salt per kilogram of seawater.

 

113. The planet that moved round the sun at the highest speed is ___?

A. Jupiter
B. Venus
C. Mars
D. Mercury

Answer

Correct Answer: D. Mercury

Detail about MCQs

The planet that moves around the Sun at the highest speed is Mercury. Mercury is the closest planet to the Sun in our solar system, and it has the shortest orbital period. It takes approximately 88 Earth days for Mercury to complete one orbit around the Sun. The proximity to the Sun results in a higher orbital speed compared to the other planets in the solar system.

 

114. In a very low temperature which from the following will freeze at last?

A. River Water
B. Canal Water
C. Sea water
D. Water in a lake

Answer

Correct Answer: C. Sea Water

Detail about MCQs

In very low temperatures, Sea water would generally freeze at a lower temperature compared to freshwater from rivers, canals, or lakes. The freezing point of seawater is lower than that of freshwater because of the dissolved salts. The presence of salts lowers the freezing point and raises the boiling point of water, making it more resistant to freezing in cold conditions.

 

115. Number of chromosomes in human body is?

A. 32
B. 59
C. 46
D. 29

Answer

Correct Answer: C. 46

Detail about MCQs

The number of chromosomes in the human body is 46. Humans have 23 pairs of chromosomes, and each parent contributes one chromosome to each pair. This includes 22 pairs of autosomes and one pair of sex chromosomes, resulting in a total of 46 chromosomes.

 

116. Agrostology is the study of?

A. Grasses
B. Leaves
C. Roses
D. Vegetables

Answer

Correct Answer: A. Grasses

Detail about MCQs

Agrostology is the study of grasses. It involves the scientific study of the family Poaceae, which includes grasses, bamboos, and cereals. Agrostologists focus on the classification, identification, and understanding of the biology of grasses.

 

117. Mimas is a moon of which of Planet?

A. Saturn
B. Jupiter
C. Mars
D. Mercury

Answer

Correct Answer: A. Saturn

Detail about MCQs

Mimas is a moon of the planet Saturn. It is one of Saturn’s natural satellites and is notable for its large Herschel Crater, which gives it a distinctive appearance resembling the Death Star from the Star Wars franchise.

 

118. Which metal is mostly used in steel products?

A. Bauxite
B. Marble
C. Copper
D. Chromite

Answer

Correct Answer: C. Copper

Detail about MCQs

The metal that is mostly used in steel products is C. Copper.
While copper is an important metal widely used in various industries, it is not the primary metal used in steel production. The primary metal used in steel production is iron. Iron is combined with carbon and other alloying elements, such as manganese, chromium, nickel, and molybdenum, to produce steel.

 

119. What is the more common name for Hansen’s disease?

A. Glaucoma
B. Tuberculosis
C. Leprosy
D. Typhoid

Answer

Correct Answer: C. Leprosy

Detail about MCQs

The more common name for Hansen’s disease is Leprosy. Hansen’s disease is a chronic infectious disease caused by the bacterium Mycobacterium leprae. It primarily affects the skin, peripheral nerves, and mucous membranes. The term “leprosy” is more widely used to refer to this condition.

 

120. What name is given to a line on a map joining places of equal temperature?

A. Isotherm
B. Isotope
C. Exoteric
D. Isolation

Answer

Correct Answer: A. Isotherm

Detail about MCQs

The name given to a line on a map joining places of equal temperature is Isotherm. Isotherms are lines connecting points on a map that have the same temperature. They are commonly used in meteorology to represent temperature distribution over a geographic area.

 

121. Solar System was discovered by?

A. Kepler
B. Galileo
C. Copernicus
D. Newton

Answer

Correct Answer: C. Copernicus

Detail about MCQs

The correct answer is Copernicus. Nicolaus Copernicus was an astronomer who proposed a heliocentric system, that the planets orbit around the Sun. He is a Polish astronomer who put forth the theory that the sun is at the centre of the Universe.

 

122. The Seasonal contrasts are maximum in ___?

A. Low Altitude
B. Mid Latitude
C. Subtropics
D. High Latitude

Answer

Correct Answer: B. Mid Latitude

Detail about MCQs

The seasonal contrasts are maximum in mid latitudes. Mid latitudes refer to the regions that are located between the equator and the polar regions. These regions experience significant seasonal variations in temperature, daylight hours, and weather conditions.

 

123. Sense of time is due to ___?

A. Rotation of Earth
B. Revolution of Earth
C. Rotation of Moon
D. Both A & B

Answer

Correct Answer: D. Both A & B

Detail about MCQs

The sense of time is due to both the rotation of the Earth on its axis and the revolution of the Earth around the Sun. The rotation of the Earth on its axis causes day and night, giving us the concept of a 24-hour day. As the Earth rotates, different parts of the globe are exposed to sunlight or darkness, leading to the cycle of day and night. The revolution of the Earth around the Sun takes approximately 365.25 days, resulting in the concept of a year. This revolution determines the changing seasons and the cycle of the calendar year. Therefore, both the rotation of the Earth (Option A) and the revolution of the Earth (Option B) contribute to our sense of time.

 

124. Hailstorm occurs in summer season due to the formation of clouds called ___?

A. Cumulus
B. Cumulonimbus
C. Cirrus
D. None of these

Answer

Correct Answer: B. Cumulonimbus

Detail about MCQs

Hailstorms in summer are often associated with the formation of clouds called Cumulonimbus clouds. Cumulonimbus clouds are large and vertically developed clouds that can bring intense thunderstorms, heavy rain, lightning, and even hail under the right atmospheric conditions. The strong updrafts and downdrafts within cumulonimbus clouds contribute to the development of hailstones.

 

125. The bodyguard of the earth is ___ that saves the earth from many comets and Asteroids:

A. Mars
B. Saturn
C. Uranus
D. Jupiter

Answer

Correct Answer: D. Jupiter

Detail about MCQs

Jupiter is often referred to as the “bodyguard of the Earth” because its strong gravitational influence can help protect the inner solar system, including Earth, from many comets and asteroids. Jupiter’s massive size and gravitational pull can alter the trajectories of incoming celestial objects, either causing them to collide with Jupiter or redirecting them away from the inner planets, including Earth. This protective role is sometimes referred to as the “Jupiter as a cosmic shield” hypothesis.

 

126. Einstein’s famous equation which states that mass and energy are interchangeable is ____?

A. E = mc2
B. E= cm2
C. M = ec2
D. M = ce2

Answer

Correct Answer: A. E = mc2

Detail about MCQs

Einstein’s famous equation which states that mass and energy are interchangeable is E = mc^2. This equation is a fundamental principle in physics, indicating that energy (E) is equal to mass (m) times the speed of light (c) squared. It demonstrates the concept that mass can be converted into energy and vice versa.

 

127. The nearest planet to the earth is ____?

A. Venus
B. Mercury
C. Mars
D. Moon

Answer

Correct Answer: A. Venus

Detail about MCQs

The nearest planet to Earth is Venus. While the Moon is the closest celestial body to Earth, when considering planets, Venus is the closest one in our solar system. Venus: Venus is the second planet from the Sun and is often referred to as Earth’s “sister planet” due to its similar size and composition. It is the closest planet to Earth.

 

128. Oxidation is a chemical reaction involving the ___?

A. Gain of Electrons
B. Loss of Electrons
C. Gain of Protons
D. Loss of Protons

Answer

Correct Answer: B. Loss of Electron

Detail about MCQs

Oxidation:
Definition: Oxidation is a chemical reaction in which a substance loses electrons.
Electron Loss: During oxidation, one or more electrons are removed from the atom or molecule undergoing the reaction.
Oxidation Number: The oxidation number of an element increases during oxidation.

 

129. The position of an element in the periodic table is determined by its ___ number?

A. Electron
B. Proton
C. Neutron
D. Positron

Answer

Correct Answer: B. Proton

Detail about MCQs

The atomic number of an element is the number of protons in the nucleus of an atom of that element. It is a unique identifier for each element and is the basis for the organization of elements in the periodic table.
The atomic number is denoted by the symbol “Z.”
Elements in the periodic table are arranged in order of increasing atomic number.
So, among the options you provided, the correct answer is Proton, as the atomic number is determined by the number of protons in an atom.

 

130. CNG stand for ___?

A. Converted Natural Gas
B. Conducted Natural Gas
C. Conducted Neural Gas
D. Compressed Natural Gas

Answer

Correct Answer: D. Compressed Natural Gas

Detail about MCQs

Let’s break down the acronym CNG:
Compressed: CNG is natural gas that has been compressed to reduce its volume for storage and transportation. Compressing natural gas makes it more practical and economical to store and transport over long distances.
Natural Gas: Natural gas primarily consists of methane (CH₄) along with small amounts of other hydrocarbons. It is a fossil fuel that is commonly used for heating, cooking, and as a fuel for vehicles.

 

131. The largest gland in the human body is___?

A. Heart
B. Kidney
C. Liver
D. Brain

Answer

Correct Answer: C. Liver

Detail about MCQs

The largest gland in the human body is the Liver. Liver:
Location: Located in the upper right side of the abdomen beneath the diaphragm.
Size: The largest internal organ in the human body.
Function: Multifunctional organ involved in metabolism, detoxification, synthesis of essential proteins, bile production, and blood filtration.
Unique Feature: Has the ability to regenerate, allowing it to recover from damage.

 

132. Temperature in human body is controlled by?

A. Pituitary Gland
B. Adrenal Gland
C. Thyroid Gland
D. Hypothalamus

Answer

Correct Answer: D. Hypothalamus

Detail about MCQs

Temperature in the Human Body is Controlled by the Hypothalamus.
Location: Located in the brain.
Function: Serves as the body’s thermostat, regulating temperature by initiating responses to maintain a relatively constant internal environment.
Thermoregulation: Monitors the body’s temperature and sends signals to adjust mechanisms like sweating or shivering to regulate heat production and loss.
Coordination: Works in conjunction with other organs and systems to maintain homeostasis, ensuring the body functions optimally at the right temperature.

 

133. Which of the following is the lightest metal?

A. Mercury
B. Silver
C. Lithium
D. Lead

Answer

Correct Answer: C. Lithium

Detail about MCQs

The lightest metal among the options is Lithium. Lithium:
Atomic Number: 3
Category: Alkali metal
Density: Low density, making it the lightest solid element.
Use: Widely used in rechargeable batteries and certain medications.
Physical Properties: Soft, silvery-white metal that is highly reactive and flammable.

 

134. The densest substance on the earth is ___?

A. Platinum
B. Copper
C. Steel
D. Osmium

Answer

Correct Answer: D. Osmium

Detail about MCQs

The densest substance on Earth is Osmium.
Density: Osmium has the highest density of any naturally occurring element.
Atomic Number: 76
Category: Transition metal
Physical Properties: Bluish-gray and extremely dense.
Applications: Used in certain alloys and in equipment that requires strong, durable materials due to its hardness and density.

 

135. What is Dry Ice?

A. Solid Oxygen
B. Solid Carbon Dioxide
C. Solid Hydrogen
D. Solid Nitrogen

Answer

Correct Answer: B. Solid Carbon Dioxide

Detail about MCQs

Dry Ice is Solid Carbon Dioxide.
Solid Carbon Dioxide (Dry Ice):Composition: Dry ice is composed of carbon dioxide (CO2) in solid form.
Formation: It forms when carbon dioxide gas is cooled and compressed.
Properties: Dry ice is extremely cold at around -78.5 degrees Celsius (-109.3 degrees Fahrenheit).
Physical State: Unlike water ice, dry ice sublimates directly from a solid to a gas without passing through a liquid phase.
Uses: Commonly used as a cooling agent in various applications, such as preserving perishable items, creating special effects in the entertainment industry, and in scientific experiments.

 

136. What name is given to the natural painkiller secreted by the brain that resemble opiate?

A. Endorphins
B. Salvia
C. Endrophane
D. Endomes

Answer

Correct Answer: A. Endorphins

Detail about MCQs

The natural painkiller secreted by the brain that resembles opioids is called Endorphins. Endorphins are a type of neurotransmitter, or chemical messenger, that is produced by the central nervous system, including the brain. They are known to have analgesic (pain-relieving) effects and can induce feelings of euphoria and well-being. Endorphins are released in response to various stimuli, such as exercise, stress, laughter, and certain foods.

 

137. A light year is equal to?

A. 8.46 Trillion km
B. 9.46 Trillion km
C. 10,46 Trillion km
D. None of these

Answer

Correct Answer: B. 9.46 Trillion km

Detail about MCQs

A light year is approximately equal to 9.46 trillion kilometers (or 5.88 trillion miles). A light-year is a unit of astronomical distance, representing the distance that light travels in one year in the vacuum of space. Since light travels at a constant speed of about 299,792 kilometers per second (186,282 miles per second) in a vacuum, a light-year is a considerable distance. The formal definition of a light-year is the distance that light travels in one Julian year, which is the time it takes for the Earth to complete one orbit around the Sun. This unit is commonly used to measure vast distances between stars and galaxies, as distances on such astronomical scales are immense and are more conveniently expressed in terms of the time it takes light to traverse them.

 

138. Deficiency of Vitamin-A results in ___?

A. Night Blindness
B. Rickets
C. Scurvy
D. Hair Fall

Answer

Correct Answer: A. Night Blindess

Detail about MCQs

Deficiency of Vitamin A results in A. Night Blindness. Vitamin A is essential for maintaining healthy vision, particularly in low light conditions. A deficiency in this vitamin can lead to a condition called night blindness, which is the inability to see clearly in dim light or at night. Vitamin A is also important for the immune system, growth and development, and the maintenance of healthy skin and mucous membranes.

 

139. Solid which undergoes sublimation is?

A. Argon
B. Iodine
C. Sodium Chloride
D. Water

Answer

Correct Answer: B. Iodine

Detail about MCQs

The solid that undergoes sublimation is B. Iodine. Sublimation is the process by which a solid directly converts into a gas without passing through the liquid state. Iodine is a solid element that can undergo sublimation when heated, forming a purple vapor without melting into a liquid. This property makes iodine commonly used in laboratory demonstrations of sublimation. Few of the substances which can undergo sublimation are iodine, ammonium chloride, camphor, naphthalene and carbon dioxide.

 

140. How does a magnesium atom form a bond with an oxygen atom?

A. By Giving one pair of Electrons to the Oxygen
B. By Sharing one pair of Electrons both Electrons Provided by the magnesium atom
C. By Sharing two pairs of electrons, both pairs provided by the oxygen atom
D. By Sharing two pairs of electrons, each atom donating one pair of electron

Answer

Correct Answer: B. By Sharing one pair of Electrons both Electrons Provided by the magnesium atom

Detail about MCQs

A magnesium atom forms a bond with an oxygen atom by donating two electrons to oxygen. This type of bond is called an ionic bond. In the process, magnesium loses two electrons (forming Mg²⁺ ions), and oxygen gains two electrons (forming O²⁻ ions). The resulting electrostatic attraction between the positively charged magnesium ion and the negatively charged oxygen ion holds the two ions together in an ionic compound, typically magnesium oxide (MgO).

 

141. These are two most common elements in the Earth Curst?

A. Oxygen and Silicon
B. Nitrogen and Silicon
C. Nitrogen and Silicon
D. Silicon and Phosphorus

Answer

Correct Answer: A. Oxygen and Silicon

Detail about MCQs

Oxygen and Silicon are indeed the two most abundant elements in the Earth’s crust, constituting a significant portion of the Earth’s solid surface. Oxygen is the most prevalent element, comprising about 46.6% of the Earth’s crust by weight. It is primarily found in the form of oxides, such as silicon dioxide (SiO2), commonly known as quartz. Silicon, the second most abundant element in the crust, makes up around 27.7%. Silicon is often present in various silicate minerals, forming the structural backbone of many rocks and minerals.

 

142. In process of sublimation ___?

A. Slid turns into Liquid
B. Solid turns into Gas
C. Liquid turns into Gas
D. Gas turns into Vapor

Answer

Correct Answer: B. Solid Turns into Gas

Detail about MCQs

Sublimation is the process in which a solid directly transforms into a gas without passing through the liquid phase. This occurs when the substance is heated, and the vapor pressure of the solid exceeds the atmospheric pressure. The solid particles gain enough energy to break the intermolecular forces and transform into the gas phase. This is why sublimation is often observed in substances like iodine, dry ice (solid carbon dioxide), and certain volatile compounds.

 

143. Cells that are responsible for photosynthesis in plants?

A. Mesophyll Cells
B. Mesenchyma Cells
C. Chloroplast
D. None of these

Answer

Correct Answer: C. Chloroplast

Detail about MCQs

Chloroplasts are the cellular structures responsible for photosynthesis in plants. These organelles contain chlorophyll, the green pigment that captures light energy and facilitates the conversion of carbon dioxide and water into glucose during the process of photosynthesis.
While mesophyll cells are involved in photosynthesis and contain chloroplasts, it is the chloroplasts themselves that directly carry out the biochemical reactions of photosynthesis.

 

144. Genetic material within larger thread like structure chromosomes is called?

A. Genes
B. DNA
C. Chromatin
D. RNA

Answer

Correct Answer: B. DNA

Detail about MCQs

Genetic material within the larger thread-like structure chromosomes is called DNA (Deoxyribonucleic Acid). Chromosomes are composed of DNA, which carries the genetic instructions for the development, functioning, growth, and reproduction of all living organisms. The DNA within chromosomes is organized along with proteins into a complex structure known as chromatin. Genes are specific segments of DNA that encode information for the synthesis of proteins or functional RNA molecules.

 

145. Which of the following does not contain cell wall?

A. Fungi
B. Algae
C. Amoeba
D. Bacteria

Answer

Correct Answer: C. Amoeba

Detail about MCQs

Amoeba does not contain a cell wall. Amoeba is a unicellular organism belonging to the group of protists, specifically the phylum Amoebozoa. Unlike fungi, algae, and bacteria, amoebas have a flexible cell membrane without a rigid cell wall. The absence of a cell wall allows amoebas to change their shape and move through their environment by extending and retracting pseudopodia (temporary projections of the cell membrane).

 

146. Atom bomb is based on the principle of?

A. Nuclear Fusion
B. Nuclear Fission
C. Radioactive
D. Both A & B

Answer

Correct Answer: B. Nuclear Fission

Detail about MCQs

The atom bomb, also known as a nuclear bomb or atomic bomb, is based on the principle of Nuclear Fission. In nuclear fission, the nucleus of an atom is split into two or more smaller nuclei, releasing a significant amount of energy. This process is used in the explosive devices known as nuclear bombs. Nuclear fusion, on the other hand, involves the merging of atomic nuclei to release energy and is the principle behind hydrogen bombs. Both fission and fusion processes involve the conversion of mass into energy, as described by Einstein’s famous equation E=mc2.

 

147. Sea water is converted into fresh water by using the phenomenon of?

A. Plasmolysis
B. Sedimentation
C. Reverse Osmosis
D. Diffusion

Answer

Correct Answer: C. Reverse Osmosis

Detail about MCQs

Sea water is converted into fresh water by using the phenomenon of Reverse Osmosis. Reverse osmosis is a water purification process that involves the removal of salt and other impurities from sea water by using a semi-permeable membrane. This membrane allows water molecules to pass through while blocking the passage of larger ions and molecules.

 

148. The Theory of mutations was given by?

A. Darwin and Lawmarck
B. Hugo de Vires
C. Haldane
D. Fleming

Answer

Correct Answer: B. Hugo de Vires

Detail about MCQs

Hugo de Vries is often associated with the rediscovery of the concept of mutation in the late 19th century and early 20th century. He proposed the theory of mutation as a sudden and heritable change in the traits of an organism. The theory of mutations was not specifically given by any of the individuals mentioned in the options. The concept of mutations as a source of variation in living organisms was developed through the work of several scientists, and it is a fundamental aspect of modern evolutionary biology.

 

149. Name the embryologist who created “Dolly” the first cloned of sheep?

A. Curtis Youngs
B. Ian Wilmut
C. Martin Nijs
D. Rondall Prather

Answer

Correct Answer: B. Lan Wilmut

Detail about MCQs

The embryologist who played a key role in the creation of “Dolly,” the first cloned sheep, is Ian Wilmut. Dolly was born in 1996 at the Roslin Institute in Scotland. Ian Wilmut, along with his colleagues, conducted the groundbreaking research that led to the successful cloning of Dolly using a technique called somatic cell nuclear transfer. This achievement marked a significant milestone in the field of cloning and mammalian reproduction.

 

150. The study of tissues is called ___?

A. Haematology
B. Histology
C. Entramology
D. Taxicology

Answer

Correct Answer: B. Histology

Detail about MCQs

The study of tissues is called Histology. Histology is the branch of biology that involves the microscopic examination of tissues to understand their structure, function, and organization. It plays a crucial role in various scientific and medical disciplines, providing insights into the complex architecture of tissues and organs in living organisms.

151. Velocity of wind is measured by?

A. Sacharimeter
B. Tachemeter
C. Anemometer
D. Audemeter

Answer

Correct Answer: C. Anemometer

Detail about MCQs

The velocity of wind is measured by an instrument called an Anemometer. Anemometers are devices specifically designed to measure the speed or velocity of the wind. They come in various types, such as cup anemometers, vane anemometers, and hot-wire anemometers, each using different principles to determine wind speed.

 

152. The first Great Arab Alchemist was?

A. Ibn-e-Sina
B. Jabir Bin Hayyan
C. Al Razi
D. Yahya Bin Mansoon

Answer

Correct Answer: B. Jabir Bin Hayyan

Detail about MCQs

Jabir ibn Hayyan is often considered the first great Arab alchemist. Jabir ibn Hayyan, also known as Geber in the Western world, was a prominent figure in the early history of alchemy. He lived during the 8th century in the Islamic Golden Age and made significant contributions to alchemical knowledge, experimenting with various chemical processes and substances. His works influenced the development of alchemy in both the Islamic world and medieval Europe.

 

153. Which of the following is not component of digestive system?

A. Stomach
B. Small Intestine
C. Heart
D. Esophagus

Answer

Correct Answer: C. Heart

Detail about MCQs

The Heart is not a component of the digestive system. The digestive system includes organs such as the stomach, small intestine, esophagus, and others, which work together to break down food, absorb nutrients, and eliminate waste. The heart, however, is part of the circulatory system and is responsible for pumping blood throughout the body.

 

154. The energy which is due to the position of any object is termed as___?

A. Kinetic Energy
B. Potential Energy
C. Chemical Energy
D. Mechanical Energy

Answer

Correct Answer: B. Potential Energy

Detail about MCQs

The energy which is due to the position of an object is termed as Potential Energy. Potential energy is the energy an object possesses because of its position, state, or condition. It can be converted into kinetic energy, which is the energy of motion, when the object moves. The most common forms of potential energy include gravitational potential energy and elastic potential energy.

 

155. Which planet of the Solar system is easily visible from the earth?

A. Venus
B. Mars
C. Mercury
D. Jupiter

Answer

Correct Answer: A. Venus

Detail about MCQs

Venus is the planet of the Solar system that is easily visible from Earth. Venus is often referred to as the “Evening Star” or the “Morning Star” because it is one of the brightest objects in the night sky and is visible shortly after sunset or before sunrise, depending on its position in its orbit. It is typically the third-brightest natural object in the sky after the Sun and the Moon.

 

156. Ordinary Table salt is sodium chloride, what is baking soda?

A. Potassium Chloride
B. Potassium Carbonate
C. Potassium Hydroxide
D. Sodium Bicarbonate

Answer

Correct Answer: D. Sodium Bicarbonate

Detail about MCQs

Baking soda is Sodium Bicarbonate. The chemical formula for baking soda is NaHCO₃, and it is composed of sodium (Na), hydrogen (H), carbon (C), and oxygen (O). Baking soda is commonly used in cooking and baking as a leavening agent to help dough rise. It has various other household uses as well, such as cleaning and neutralizing odors.

 

157. Plants receive their nutrients mainly from?

A. Chlorophyll
B. Atmosphere
C. Light
D. Soil

Answer

Correct Answer: D. Soil

Detail about MCQs

Plants receive their nutrients mainly from the Soil. While light is essential for the process of photosynthesis, which allows plants to produce their own food, and the atmosphere provides carbon dioxide for photosynthesis, the soil is the primary source of essential minerals and nutrients that plants need for growth. Plant roots absorb water and nutrients from the soil, including minerals like nitrogen, phosphorus, and potassium, which are crucial for various physiological processes and the overall health of the plant.

 

158. Plants that grow under average temperature and moisture are called?

A. Halophytes
B. Hydrophytes
C. Mesophytes
D. Xerophytes

Answer

Correct Answer: C. Mesophytes

Detail about MCQs

Plants that grow under average temperature and moisture conditions are called Mesophytes. Mesophytes are adapted to moderate environmental conditions and are neither specialized for extremely wet (hydrophytes) nor extremely dry (xerophytes) environments. They thrive in conditions with moderate temperatures and sufficient moisture, which are often found in typical terrestrial habitats.

 

159. Main function of antibodies is against ____?

A. Unfavorable Environment
B. During Deficiency of Nutrient
C. Infection
D. None of these

Answer

Correct Answer: C. Infection

Detail about MCQs

The main function of antibodies is against Infection. Antibodies, also known as immunoglobulins, are proteins produced by the immune system in response to the presence of foreign substances, such as bacteria, viruses, or other pathogens. Antibodies recognize and bind to specific antigens on the surface of these invaders, marking them for destruction by other immune cells. The primary role of antibodies is to neutralize, inhibit, or eliminate pathogens to prevent infections and protect the body from harmful invaders.

 

160. Smallest bone of human body is ___?

A. Nails
B. Fibula
C. Bone of the Nose
D. Stapes

Answer

Correct Answer: D. Stapes

Detail about MCQs

The smallest bone in the human body is the Stapes. The stapes, also known as the stirrup bone, is located in the middle ear and is involved in the transmission of sound vibrations. It is part of the auditory ossicles, a group of three small bones (malleus, incus, and stapes) that play a crucial role in the process of hearing. The stapes is specifically associated with transmitting vibrations from the incus (anvil) to the inner ear.

 

161. The largest invertebrate is?

A. Octopus
B. Squid
C. Coral
D. Jelly Fish

Answer

Correct Answer: B. Squid

Detail about MCQs

The largest invertebrate is the Squid. The giant squid (Architeuthis dux) holds the title for being the largest invertebrate. It is a deep-sea dwelling cephalopod and is known for its enormous size. The size of giant squids can vary, but some individuals have been reported to reach lengths of up to 43 feet (13 meters) or more. The giant squid has tentacles equipped with suckers and is a fascinating creature that inhabits the depths of the ocean.

 

162. Function of pace maker is?

A. To Regulate the formation of Urine
B. To Regulate the process of Digestion
C. To Initiate Heart beat
D. To Start the Process of Respiration

Answer

Correct Answer: C. To Initiate Heart beat

Detail about MCQs

The function of a pacemaker is to initiate heartbeats. A pacemaker is a small electronic device implanted in the chest or abdomen to help control abnormal heart rhythms (arrhythmias). It emits electrical impulses that stimulate the heart to beat at a normal rate, especially when the heart’s natural pacemaker (the sinoatrial node) is not functioning properly or when there are irregularities in the heart’s rhythm. The pacemaker helps maintain a regular and appropriate heartbeat, ensuring effective pumping of blood throughout the body.

 

163. The red blood cells originated in the ____?

A. Ligaments
B. Liver
C. Spleen
D. Bone Marrow

Answer

Correct Answer: D. Bone Marrow

Detail about MCQs

Red blood cells (erythrocytes) originate in the Bone Marrow. The bone marrow, found in the cavities of certain bones, is a crucial site for the production of blood cells, including red blood cells. The process of red blood cell production is known as erythropoiesis, and it occurs in the red bone marrow. After their formation, red blood cells enter the bloodstream and play a vital role in transporting oxygen from the lungs to the rest of the body and returning carbon dioxide to the lungs for exhalation.

 

164. Trachoma is disease of the ____?

A. Brain
B. Larynx
C. Throat
D. Eye

Answer

Correct Answer: D. Eye

Detail about MCQs

Trachoma is a disease of the Eye. It is a contagious bacterial infection caused by Chlamydia trachomatis, and it primarily affects the conjunctiva (the outer surface of the eye) and the cornea. Trachoma is a leading cause of preventable blindness in some developing countries. If left untreated, repeated infections can lead to scarring, which may result in the eyelashes turning inward and scratching the cornea, causing further damage and potentially leading to blindness.

 

165. Deficiency of ____ causes loss of appetite and poor growth?

A. Zinc
B. Iodine
C. Copper
D. Iron

Answer

Correct Answer: A. Zinc

Detail about MCQs

Deficiency of Zinc can cause loss of appetite and poor growth. Zinc is an essential trace element that plays a crucial role in various physiological processes, including growth, immune function, and appetite regulation. Zinc deficiency can lead to a range of health issues, and in children, it may result in growth retardation and impaired development. Adequate levels of zinc are necessary for overall health and well-being.

 

166. Sensitive layer of the eye is?

A. Choroid
B. Scientific
C. Retina
D. Cornea

Answer

Correct Answer: C. Retina

Detail about MCQs

a light sensitive layer that lines the interior of the eye. It is composed of light sensitive cells known as rods and cones. The human eye contains about 125 million rods, which are necessary for seeing in dim light.

 

167. Which Gas is used in the preparation of Soft drinks?

A. Oxygen
B. Carbon Dioxide
C. Nitrogen
D. Halogen

Answer

Correct Answer: B. Carbon Dioxide

Detail about MCQs

Carbon Dioxide is the gas used in the preparation of soft drinks. It is dissolved
in the beverage to create carbonation, giving the drink its characteristic fizziness. The process involves carbonating the beverage by pressurizing it with carbon dioxide, which dissolves into the liquid to form carbonic acid. This carbonation enhances the taste and mouthfeel of the soft drink.

 

168. What is the function of Hemoglobin?

A. Utilization of Energy
B. Prevention of Anemia
C. Destruction of Bacteria
D. Transportation of Oxygen

Answer

Correct Answer: D. Transportation of Oxygen

Detail about MCQs

The primary function of Hemoglobin is the Transportation of Oxygen. Hemoglobin is a protein found in red blood cells, and its main role is to bind with oxygen in the lungs and transport it to the tissues and organs throughout the body. Oxygen binds to the iron component of hemoglobin, forming oxyhemoglobin, which is then carried through the bloodstream. This oxygen delivery is crucial for cellular respiration, where cells use oxygen to produce energy. Hemoglobin also helps in the transport of carbon dioxide from the tissues back to the lungs for exhalation.

 

169. Which acid is used in car battery?

A. Sulfuric Acid
B. Carbonic Acid
C. Nitric Acid
D. Hydrochloric Acid

Answer

Correct Answer: A. Sulfuric Acid

Detail about MCQs

Sulfuric Acid is used in car batteries. Car batteries, specifically lead-acid batteries, utilize a solution of sulfuric acid (H2SO4) as the electrolyte. The sulfuric acid facilitates the electrochemical reactions that occur within the battery, allowing for the storage and release of electrical energy. It is important to handle sulfuric acid with care, as it is a corrosive and potentially hazardous substance.

 

170. Which of the following helps body to repair and build tissues and muscle?

A. Carbohydrates
B. Vitamins
C. Proteins
D. Calcium

Answer

Correct Answer: C. Proteins

Detail about MCQs

Proteins are the macronutrients that play a crucial role in repairing and building tissues, including muscles. While carbohydrates provide energy, vitamins contribute to various bodily functions, and calcium is essential for bone health, proteins are specifically known for their role in tissue repair and muscle building.

 

171. Fear of Height is called?

A. Agoraphobia
B. Acrophobia
C. Altophobia
D. B & C

Answer

Correct Answer: D. B & C

Detail about MCQs

The fear of heights is called acrophobia. Therefore, the correct answer is “B & C,” as both options B (Acrophobia) and C (Altophobia) refer to the fear of heights. Agoraphobia, on the other hand, is a different type of anxiety disorder characterized by the fear of situations or places that might cause panic, helplessness, or

 

172. DNA is ___?

A. A Class of Nucleic Acid
B. Citric Acid
C. Acetic Acid
D. An Enzyme

Answer

Correct Answer: A. A class of Nucleic Acid

Detail about MCQs

DNA (Deoxyribonucleic Acid) is a class of nucleic acid. Therefore, the correct answer is “A Class of Nucleic Acid.” DNA is a molecule that carries genetic instructions for the development, functioning, growth, and reproduction of all known living organisms and many viruses.

 

173. Omicron variant of COVID has negligible effect on those who follow ____?

A. Vaccination with 2 Doses
B. Booster Shot
C. SOIPS
D. All of these

Answer

Correct Answer: D. All of these

Detail about MCQs

In November 2021, the World Health Organization (WHO) first identified the Omicron mutation of the COVID-19 virus as a variant of concern. It quickly became the most common strain worldwide. Since then, several sub-variants of Omicron have surfaced, including BA.2, BA.3, BA.4, and BA.5. By the summer of 2022, the BA.5 variant was the most dominant strain in the US.

 

174. Which among the following carries impure blood to human heart?

A. Aorta
B. Pulmonary Vein
C. Pulmonary Arteries
D. Vena Cava

Answer

Correct Answer: D. Vena Cava

Detail about MCQs

The vessel that carries impure (deoxygenated) blood to the human heart is the Vena Cava. There are two main types of vena cava: the superior vena cava, which brings deoxygenated blood from the upper part of the body, and the inferior vena cava, which brings deoxygenated blood from the lower part of the body. After reaching the heart through the vena cava, the blood is then pumped to the lungs for oxygenation and purification.

 

175. Which disease is caused to the deficiency of vitamin D that causes bones to become soft and weak?

A. Beriberi
B. Rickets
C. Scurvy
D. Night Blindness

Answer

Correct Answer: B. Rickets

Detail about MCQs

The disease caused by a deficiency of vitamin D that leads to soft and weak bones is called Rickets. Rickets is a condition where the bones in children fail to properly mineralize, resulting in skeletal deformities and soft bones. Vitamin D plays a crucial role in the absorption of calcium and phosphorus, and its deficiency can impair the mineralization of bones. The other conditions mentioned (Beriberi, Scurvy, Night Blindness) are caused by deficiencies of other vitamins (thiamine, vitamin C, and vitamin A, respectively).

 

176. Fats are found in following except?

A. Oil
B. Butter
C. Vegetable
D. None of these

Answer

Correct Answer: D. None of these

Detail about MCQs

Fats are found in all the options provided: oil, butter, and vegetable. Therefore, the correct answer is “None of these.” Fats can be present in various oils, butter, and some vegetables contain fat as well, though the type and amount of fat may vary.

 

177. Animals that eat both plants and animals are known as?

A. Herbivores
B. Carnivores
C. Omnivores
D. Insectivores

Answer

Correct Answer: C. Omnivores

Detail about MCQs

Animals that eat both plants and animals are known as Omnivores. Omnivores have a mixed diet that includes both plant matter and animal flesh. Examples of omnivores include humans, bears, and pigs. Herbivores eat plants, carnivores eat meat, and insectivores primarily eat insects.

 

178. A Solution that can dissolve more solute at a given temperature is called?

A. Saturated Solution
B. Unsaturated Solution
C. Supersaturated Solution
D. Concentrated Solution

Answer

Correct Answer: B. Unsaturated Solution

Detail about MCQs

A solution that can dissolve more solute at a given temperature is called an Unsaturated Solution. In an unsaturated solution, the concentration of the solute is below its saturation point, and more solute can be added and dissolved in the solvent.

 

179. The atoms of one element which have the same atomic number but different mass number is known as?

A. Isomers
B. Isotopes
C. Isomorphs
D. Isobars

Answer

Correct Answer: B. Isotopes

Detail about MCQs

The atoms of one element which have the same atomic number but different mass numbers are known as Isotopes. Isotopes are atoms of the same element that have the same number of protons (and thus the same atomic number) but different numbers of neutrons, resulting in different mass numbers. Isomers, isomorphs, and isobars refer to different concepts in chemistry and physics.

 

180. A chemical compound always contains the same elements combined together in the same proportion or ratio is the statement of?

A. Law of conservation of Mass
B. Law of multiple proportion
C. Law of constant composition
D. Law of Reciprocal Proportion

Answer

Correct Answer: C. Law of Constant Composition

Detail about MCQs

Both terms, “Law of Constant Composition” and “Law of Constant Proportion,” are often used interchangeably, and they refer to the same fundamental principle in chemistry. This law states that a given chemical compound always contains the same elements combined together in the same proportion by mass. So, whether you refer to it as the “Law of Constant Composition” or the “Law of Constant Proportion,” you are expressing the same concept. Both terms are widely accepted and convey the idea that the composition of a compound is constant and fixed.

 

181. Which of the following animal is secondary consumer?

A. Cat
B. Sheep
C. Mouse
D. Wolf

Answer

Correct Answer: D. Wolf

Detail about MCQs

Among the options provided, the secondary consumer is the Wolf. In an ecological food chain, a secondary consumer is an organism that primarily feeds on primary consumers (herbivores) and indirectly on primary producers (plants). Wolves typically feed on animals like mice, rabbits, deer, and other herbivores, making them secondary consumers in the food chain.

 

182. Among the following, which is not present in animal cell?

A. Cell membrane
B. Cytoplasm
C. Cell Wall
D. Nucleus

Answer

Correct Answer: C. Cell Wall

Detail about MCQs

Among the options provided, “Cell Wall” is not present in an animal cell. Animal cells lack a rigid cell wall, which is a characteristic feature of plant cells, fungi, and some other organisms. Animal cells are surrounded by a flexible cell membrane that gives shape and support to the cell. The other components listed—cell membrane, cytoplasm, and nucleus—are present in both plant and animal cells.

 

183. When a French bean germinates in soil, a hook like structure emerges that structure is called?

A. Hypocotyl
B. Cotyledons
C. Embryo
D. Micropyl

Answer

Correct Answer: A. Hypocotyl

Detail about MCQs

When a French bean germinates in soil, the hook-like structure that emerges is called the hypocotyl hook. The hypocotyl is the embryonic stem of a seedling, located below the cotyledons. The hypocotyl hook helps the emerging seedling push through the soil surface during germination. The cotyledons are the seed leaves, and they play a role in providing nutrients to the seedling until it can photosynthesize on its own. The embryo is the entire young plant within the seed. Micropyl is the opening in the seed coat through which the pollen tube enters during fertilization.

 

184. The substances that are added in the soil to make up any deficiency of minerals are called?

A. Fertilizers
B. Hydrocarbons
C. Plasticizers
D. Neutralizers

Answer

Correct Answer: A. Fertilizers

Detail about MCQs

The substances that are added to the soil to make up any deficiency of minerals are called fertilizers. Fertilizers provide essential nutrients to plants, promoting their growth and improving crop yields.

 

185. Which one among the following is a hydrocarbons compound?

A. Candle Wax
B. Table Salt
C. Glass
D. Soda Ash

Answer

Correct Answer: A. Candle Wax

Detail about MCQs

Candle Wax is a hydrocarbon compound. Hydrocarbons are organic compounds composed of hydrogen and carbon atoms. Candle wax is typically made up of hydrocarbons, such as long-chain alkanes (paraffins), which are organic molecules consisting of hydrogen and carbon atoms bonded together. In the case of candle wax, these hydrocarbons provide the fuel for the candle to burn.

 

186. Which among the following isotope is used for radiotherapy to stop the growth of cancer cells?

A. Cobalt-62
B. Cobalt 60
C. Cobalt 58
D. None of these

Answer

Correct Answer: B. Cobalt 60

Detail about MCQs

Cobalt-60 is the isotope used for radiotherapy to stop the growth of cancer cells. Cobalt-60 is a radioactive isotope of cobalt, and its gamma rays are used in radiation therapy to target and destroy cancer cells. The high-energy gamma rays emitted by Cobalt-60 disrupt the DNA in rapidly dividing cells, including cancer cells, preventing them from growing and dividing further. This helps in treating various types of cancers.

 

187. Carbon dating is used for the estimation of the age of?

A. Light
B. Fossils
C. Gases
D. Plastic

Answer

Correct Answer: B. Fossils

Detail about MCQs

Carbon dating is primarily used for the estimation of the age of organic materials, such as fossils. It is a method used in archaeology, paleontology, and other fields to determine the age of ancient and prehistoric artifacts, bones, and other organic remains. The technique relies on the measurement of the decay of the radioactive isotope carbon-14, which is present in living organisms and undergoes predictable decay over time.

 

188. Which one of the following is not a sign of chemical change?

A. Release of Gas
B. Change in Colour
C. Change in Smell
D. No Change in Composition

Answer

Correct Answer: D. No change in Composition

Detail about MCQs

Evolution of gas, release of heat and change in smell can be observed during a chemical change. However, the shape of a substance is a physical property and any change in physical properties cannot be considered as an indicator of a chemical change.

 

189. A process in which light rays falls on any material object and these rays bounce back is known as?

A. Reflection
B. Refraction
C. Diffraction
D. Deflection

Answer

Correct Answer: A. Reflection

Detail about MCQs

The process in which light rays fall on a material object and bounce back is known as “reflection.” Reflection occurs when light encounters a surface and is redirected, bouncing off that surface. This is a fundamental optical phenomenon and is responsible for what we commonly observe in mirrors, polished surfaces, and other reflective materials.

 

190. Which one of the following reduces the friction?

A. Banana Peel
B. Rough Road
C. Ridges and Grooves on the Soles
D. Rough Surface

Answer

Correct Answer: C. Ridges and Grooves on the Soles

Detail about MCQs

Ridges and grooves on the soles of a surface are designed to reduce friction. So, among the options given, “Ridges and Grooves on the Soles” is the one that helps in reducing friction. These features on shoe soles, for example, increase surface area contact and provide channels for fluids (like water) to escape, improving traction and reducing the likelihood of slipping.

 

191. The maize seed is surrounded by a seed coat and it has an opening called?

A. Hypocotyl
B. Dypocotyl
C. Micropyle
D. Cotyledon

Answer

Correct Answer: C. Microphyle

Detail about MCQs

The opening in the seed coat of a maize seed is called the “micropyle.” The micropyle is a small opening through which water and gases can enter the seed during the process of germination. It allows for the exchange of substances between the seed and its external environment.

 

192. Which one of the following is non-biodegradable material?

A. Plastics
B. Human Waste
C. Food Waste
D. None of these

Answer

Correct Answer: A. Plastics

Detail about MCQs

Plastics are non-biodegrad able materials. Unlike organic materials such as food waste or human waste, which can be broken down by natural processes, plastics do not easily decompose over time. Non-biodegradable materials like plastics can persist in the environment for long periods, contributing to pollution and environmental concerns.

 

193. The type of germination in which the cotyledons empty above the ground is called?

A. Axial Germination
B. Lateral Germination
C. Epigeal Germination
D. Hypogeal Germination

Answer

Correct Answer: C. Eipgeal Germination

Detail about MCQs

The type of germination in which the cotyledons emerge above the ground is called “Epigeal Germination.” In this process, the shoot system, including the cotyledons and the young shoot, is lifted above the soil surface. The cotyledons become green and start carrying out photosynthesis. This type of germination is contrasted with “Hypogeal Germination,” where the cotyledons remain below the soil surface during germination.

 

194. Among the following which group of food protects us from many diseases?

A. Fats
B. Vitamins
C. Carbohydrates
D. Protein

Answer

Correct Answer: B. Vitamins

Detail about MCQs

Vitamins are the group of food that plays a crucial role in protecting us from many diseases. They are essential micronutrients that support various physiological functions in the body and are vital for maintaining good health. Different vitamins have specific roles, such as boosting the immune system, promoting vision, supporting bone health, and acting as antioxidants to protect cells from damage. While all macronutrients (fats, carbohydrates, and proteins) are important for overall health, vitamins are particularly known for their role in disease prevention and overall well-being.

 

195. Anemia is caused due to the deficiency of:

A. Calcium
B. Potassium
C. Iron
D. Sodium

Answer

Correct Answer: C. Iron

Detail about MCQs

Anemia is commonly caused by a deficiency of iron. Iron is an essential mineral that plays a crucial role in the formation of hemoglobin, the protein in red blood cells responsible for carrying oxygen throughout the body. When there is insufficient iron in the body, it can lead to a decrease in the production of hemoglobin, resulting in anemia. While other nutritional deficiencies or underlying health conditions can also cause anemia, iron deficiency anemia is one of the most prevalent forms.

 

196. Among the following, which substance is not a compound?

A. H2O
B. NaCl
C. CO2
D. Mg

Answer

Correct Answer: D. Mg

Detail about MCQs

“Mg” represents magnesium, which is not a compound; it is an element. In contrast, the other three substances listed are compounds:
H₂O: Water, a compound composed of hydrogen and oxygen.
NaCl: Table salt, a compound composed of sodium and chlorine.
CO₂: Carbon dioxide, a compound composed of carbon and oxygen.
Elements, like magnesium (Mg), consist of only one type of atom and cannot be broken down into simpler substances by chemical means. Compounds, on the other hand, are substances formed by the chemical combination of two or more elements.

 

197. The process which converts carbon dioxide into glucose is known as?

A. Phytolysis
B. Carbolysis
C. Photosynthesis
D. Phytosynthesis

Answer

Correct Answer: C. Photosynthesis

Detail about MCQs

The process that converts carbon dioxide into glucose is known as “Photosynthesis.” During photosynthesis, plants, algae, and some bacteria use the energy from sunlight to convert carbon dioxide and water into glucose (a form of sugar) and oxygen. This process is crucial for the production of food and oxygen in the biosphere.

 

198. In mercury thermometer, mercury of bulb expands and rises in the tube which has linear scale?

A. 1 F – 48 F
B. 8 F – 68 F
C. 54 F – 98 F
D. 94 F – 108 F

Answer

Correct Answer: C. 54 F – 98 F

Detail about MCQs

The correct range for the Fahrenheit scale, based on the options provided, is:
54°F – 98°F
So, in a mercury thermometer, as the mercury in the bulb expands and rises in the tube, the temperature reading will be within the range of 54°F to 98°F on the Fahrenheit scale

 

199. How many lenses are present in refracting telescope?

A. Only one Lens
B. Two Lenses
C. Three Lenses
D. Five Lenses

Answer

Correct Answer: B. Two Lenses

Detail about MCQs

A refracting telescope typically consists of two lenses:
1. Objective Lens: This lens is at the front of the telescope and gathers and focuses light from distant objects.
2. Eyepiece Lens: This lens is closer to the eye and magnifies the focused image produced by the objective lens.
So, the correct answer is: Two Lenses in a refracting telescope.

 

200. In which color the coolest stars are appeared?

A. Yellow
B. Blue
C. Red
D. Green

Answer

Correct Answer: C. Red

Detail about MCQs

The coolest stars generally appear red. The color of a star is related to its temperature, with cooler stars emitting light more toward the red end of the spectrum, and hotter stars emitting light more toward the blue end. Therefore, red stars are cooler compared to yellow, blue, or green stars.

 

201. Which of the following is a water-soluble vitamin?

A. Vitamin A
B. Vitamin C
C. Vitamin K
D. Vitamin D

Answer

Correct Answer: B. Vitamin C


Detail about MCQs

Vitamin C is a water-soluble vitamin. Water-soluble vitamins dissolve in water and are easily absorbed by the body. Vitamin C, also known as ascorbic acid, is important for various bodily functions, including the synthesis of collagen, absorption of iron, and maintenance of the immune system. It is commonly found in fruits and vegetables like oranges, strawberries, and bell peppers. Vitamin A, Vitamin K, and Vitamin D are fat-soluble vitamins, meaning they are absorbed along with dietary fat and are stored in the body’s fatty tissues.

 

202. Which color of light has the shortest wavelength?

A. Red
B. Green
C. Blue
D. None of these

Answer

Correct Answer: C. Blue

Detail about MCQs

The color of light with the shortest wavelength is Blue.
Wavelength and Color:
Light is made up of electromagnetic waves, and its color is determined by its wavelength.
Shorter wavelengths are associated with higher frequencies and higher energy.
Blue Light:
Blue light has a shorter wavelength compared to red and green light.
It is part of the visible light spectrum, with wavelengths ranging from approximately 450 to 495 nanometers.
Blue light is often used in technology, such as LED displays and Blu-ray technology.
Other Colors:
Red light has a longer wavelength compared to blue light and is associated with lower energy.
Green light falls between red and blue in terms of wavelength and energy.

 

203. Functional group of chlorophyll is?

A. –CHO
B. –CH3
C. –C2H3
D. None of these

Answer

Correct Answer: B.-CH3

Detail about MCQs

Chlorophyll A, contains methyl group (-CH 3 ) and chlorophyll b contains aldehydic group (-CHO) instead. Chlorophyll is a green pigment found in plants. It is present in special cellular organelle called chloroplast present only in plant cells.

 

204. Linkage prevent between to heavy chains of Antibody molecule?

A. Double Disulphide
B. Double H-Bond
C. Double Covalent
D. None of these

Answer

Correct Answer: A. Double Disulphide

Detail about MCQs

The disulfide bonds contribute to the stability and structure of the antibody molecule.
The overall structure of antibodies is critical for their function in recognizing and binding to specific antigens.
In summary, the linkage preventing separation between the two heavy chains of an antibody molecule is a “double disulfide bond.” These bonds are essential for maintaining the structural integrity of the antibody, allowing it to effectively carry out its immune functions.

 

205. Agranulocytes (type of WBC) are formed in?

A. Red Bone Marrow
B. Liver
C. Lymphoid Tissue
D. None of these

Answer

Correct Answer: C. Lymphoid Tissue

Detail about MCQs

In birds and mammals the separation of function is complete: formation of granulocytes and erythrocytes is restricted to the bone marrow and agranulocytes are produced in lymphoid tissue.

 

206. Genetically modified bacterium is produced when bacterium takes in?

A. Recombinant DNA
B. Modified DNA
C. Muted DNA
D. All of these

Answer

Correct Answer: A. Recombinant DNA

Detail about MCQs

Genetically modified bacterium is produced when bacterium takes in Recombinant DNA. Recombinant DNA:
Definition: Recombinant DNA is formed by combining DNA from different sources.
Process: In genetic engineering, genes of interest are inserted into a bacterial cell’s DNA, creating a genetically modified bacterium.
Technique: This is often achieved using techniques like gene cloning and transformation.
In summary, genetically modified bacteria are produced when bacteria take in recombinant DNA, a process commonly used in genetic engineering and biotechnology.

 

207. The term Xerostomia refers to?

A. Dry Skin
B. Dry Mouth
C. Dry Nose
D. None of these

Answer

Correct Answer: B. Dry Mouth

Detail about MCQs

Xerostomia:
Definition: Xerostomia is a medical term that refers to the condition of having an abnormally dry mouth.
Symptoms: Individuals with xerostomia may experience dryness, discomfort, and a reduced production of saliva in the mouth.
Causes: Xerostomia can be caused by various factors, including medications, certain medical conditions, radiation therapy to the head and neck, and dehydration.
Consequences: Reduced saliva production can have several consequences, including difficulty in swallowing, speaking, and an increased risk of dental issues such as cavities and gum disease.

 

208. A hypersonic weapon travels at hypersonic speed which is ___ times the speed of sound?

A. 10 to 50
B. 5 to 25
C. 2 to 10
D. None of these

Answer

Correct Answer: B. 5 to 25

Detail about MCQs

A hypersonic weapon is one that travels at speeds ranging from 5 to 25 times the speed of sound, making it extremely fast and capable of rapid and unpredictable maneuvers.

 

209. Photon with energy greater than 1.02 MeV can interact with matter as?

A. Photoelectric Effect
B. Compton Effect
C. Pair Production
D. None of these

Answer

Correct Answer: C. Pair Production

Detail about MCQs

Pair Production:
Definition: Pair production is a process in which a photon, typically a high-energy gamma-ray photon, interacts with the electromagnetic field near a nucleus, creating an electron and its antiparticle, a positron.
Energy Threshold: Pair production typically occurs when the energy of the photon is greater than or equal to twice the rest mass energy of an electron (1.02 MeV).
Outcome: The photon disappears, and the electron and positron move away from each other.

 

210. The uncertainty principle was given by?

A. De-Broglie
B. Heisenberg
C. Einstein
D. None of these

Answer

Correct Answer: B. Heisenberg

Detail about MCQs

The uncertainty principle was given by Werner Heisenberg. It is a fundamental concept in quantum mechanics, proposed by Heisenberg in 1927. The principle states that certain pairs of properties, such as a particle’s position and momentum, cannot be precisely simultaneously known. The more accurately one property is measured, the less accurately the other can be known. This inherent limit to precision has profound implications for our understanding of the behavior of particles on the quantum scale, challenging classical notions of determinism and emphasizing the probabilistic nature of quantum systems. The uncertainty principle played a crucial role in shaping the foundations of quantum mechanics.

 

211. Controlling rods inserted into the reactor are of metal?

A. Aluminum
B. Cadmium
C. Magnesium
D. None of these

Answer

Correct Answer: B. Cadmium

Detail about MCQs

Control rods inserted into a nuclear reactor play a crucial role in regulating the reactor’s power output, and they are often made of cadmium. Cadmium is chosen for its high neutron-absorbing capacity, which allows it to effectively control the rate of nuclear fission chain reactions. By adjusting the position of these cadmium control rods within the reactor core, operators can manage the absorption of neutrons, thus controlling the power produced by the reactor.

 

212. Which of the following type of mirrors can form an image larger than the object?

A. Concave
B. Convex
C. Plane
D. None of these

Answer

Correct Answer: A. Concave

Detail about MCQs

A concave mirror is the type of mirror that can form an image larger than the object. In a concave mirror, the reflecting surface curves inward, and its focal point lies in front of the mirror. When an object is positioned beyond the focal point but within the mirror’s focal length, a real and magnified image is formed. This phenomenon is utilized in various optical devices such as makeup mirrors and shaving mirrors. The ability of a concave mirror to produce magnified images is attributed to its converging nature, causing light rays parallel to the mirror’s axis to converge and intersect, resulting in an enlarged and upright image.

 

213. For anti-clock wise rotation direction of angular velocity is?

A. Positive
B. Negative
C. Zero
D. None of these

Answer

Correct Answer: A. Positive

Detail about MCQs

In the context of angular velocity, the convention for defining the direction of rotation is as follows: anti-clockwise rotation is considered as having a positive angular velocity. Angular velocity is a vector quantity, and its direction is determined by the right-hand rule. If you imagine pointing your thumb in the direction of the rotational axis and curling your fingers in the direction of rotation, the direction your fingers move represents the positive direction of angular velocity. For anti-clockwise rotation, if you look along the axis of rotation in the direction of the rotation, the angular velocity vector points towards you, and this direction is considered positive.

 

214. The density of ice?

A. 0.9 g/cm3
B. 1 g/cm3
C. 1:1 g/cm3
D. None of these

Answer

Correct Answer: A. 0.9 g/cm3

Detail about MCQs

The density of ice is approximately 0.9 g/cm³. Unlike most substances, water expands as it freezes into ice due to the unique arrangement of its molecules in a hexagonal lattice structure. As a result, the density of ice is lower than that of liquid water, which has a density of approximately 1 g/cm³. The expansion during freezing is why ice floats on water. This property is vital for aquatic ecosystems as it allows a layer of ice to form on the surface of bodies of water, insulating the liquid beneath and providing a habitat for aquatic life during cold seasons.

 

215. Mach number is used in connection with the speed of?

A. Ship
B. Light
C. Aircraft
D. None of these

Answer

Correct Answer: C. Aircraft

Detail about MCQs

The Mach number is a dimensionless unit that represents the speed of an object in a fluid, such as air or water, compared to the speed of sound in that fluid. It is named after Ernst Mach, an Austrian physicist. Mach number is used in connection with the speed of aircraft. It represents the ratio of the speed of an object to the speed of sound in the surrounding medium. So, the correct option is: Aircraft.

 

216. What is the SI unit of temperature?

A. Kelvin
B. Celsius
C. Fahrenheit
D. Centigrade

Answer

Correct Answer: A. Kelvin

Detail about MCQs

The SI (International System of Units) unit of temperature is the Kelvin (K). The Kelvin scale is an absolute temperature scale where 0 Kelvin is absolute zero, the lowest possible temperature. The Kelvin scale is commonly used in scientific and engineering contexts, and it is the standard unit of temperature in the International System of Units (SI).

 

217. What plays the most important role in regulating temperature and determining climate on the Earth?

A. Oceans
B. Mountains
C. Deserts
D. Forests

Answer

Correct Answer: A. Oceans

Detail about MCQs

Oceans play the most important role in regulating temperature and determining climate on Earth. The large thermal capacity of the oceans allows them to absorb and store vast amounts of heat. This heat storage capacity helps to moderate temperatures, both on land and in the atmosphere, creating a more stable climate. Oceans influence weather patterns, precipitation, and overall climate conditions.

 

218. Which part of the donor’s eye is utilized in eye donation?

A. Cornea
B. Lens
C. Retina
D. None of these

Answer

Correct Answer: A. Cornea

Detail about MCQs

In eye donation, the part of the donor’s eye that is typically utilized is the cornea. Corneal transplantation involves replacing a damaged or diseased cornea with a healthy cornea from a donor. The cornea is the transparent front part of the eye that covers the iris, pupil, and anterior chamber. It plays a crucial role in focusing light onto the retina and maintaining the eye’s structural integrity. The other parts mentioned (lens and retina) are not typically transplanted during routine eye donation procedures.

 

219. Potassium Permanganate is used for purifying drinking water, because?

A. It is a Reducing Agent
B. It dissolves the Impurities Agent
C. It is a Sterilizing Agent
D. It is an Oxidizing Agent

Answer

Correct Answer: D. It is an Oxidizing Agent

Detail about MCQs

Potassium permanganate is used for purifying drinking water primarily because it is an oxidizing agent. When added to water, potassium permanganate releases oxygen, which helps in the oxidation and removal of impurities, organic matter, and some microorganisms. It is effective in treating water for various contaminants and is particularly useful in situations where water needs disinfection and clarification.

 

220. Which one of the following types of waves is used in a night vision apparatus?

A. Radio Waves
B. Microwave
C. Infra-red Waves
D. None of these

Answer

Correct Answer: C. Infrared Waves

Detail about MCQs

Night vision apparatus typically uses infrared waves. Infrared (IR) waves have longer wavelengths than visible light, and they are not visible to the human eye. Night vision devices use infrared technology to detect and amplify ambient infrared radiation, allowing users to see in low-light or nighttime conditions. The heat emitted by objects in the form of infrared radiation is captured by these devices, enabling observation in situations where there is insufficient visible light.

 

221. What is the longest bone in the human body?

A. Femur
B. Arm
C. Leg
D. None of these

Answer

Correct Answer: A. Femur

Detail about MCQs

The femur is the longest bone in the human body. It is the thigh bone and extends from the hip to the knee. The femur is a strong, weight-bearing bone that plays a crucial role in supporting the body and facilitating various movements.

 

222. What divides the Earth into the Northern and Southern Hemispheres?

A. Axis of Rotation
B. Equator
C. North Pole
D. South Pole

Answer

Correct Answer: B. Equator

Detail about MCQs

The Equator divides the Earth into the Northern Hemisphere and the Southern Hemisphere. The Equator is an imaginary line that encircles the Earth horizontally, positioned equidistant from the North Pole and the South Pole. It serves as the reference point for measuring latitude, and locations north of the Equator are considered part of the Northern Hemisphere, while locations south of the Equator are part of the Southern Hemisphere.

 

223. The speed of sound is fasted in?

A. Solids
B. Liquids
C. Gasses
D. Vacuum

Answer

Correct Answer: A. Solids

Detail about MCQs

The speed of sound is fastest in solids. Sound travels faster through denser materials, and since solids have a higher density than liquids and gases, the speed of sound is generally faster in solids. In a vacuum, where there is no medium to transmit sound waves, sound cannot propagate, so it does not have a speed in a vacuum.

 

224. The weight of an object will be minimum when it is placed at?

A. The North Pole
B. The South Pole
C. The Equator
D. The Center of the Earth

Answer

Correct Answer: D. The center of the Earth

Detail about MCQs

The weight of an object will be minimum when it is placed at the center of the Earth. This is because the gravitational force acting on an object is proportional to the mass of the object and inversely proportional to the square of the distance between the centers of the masses of the object and the Earth. At the center of the Earth, the distance is minimized, resulting in the minimum gravitational force and, consequently, the minimum weight of the object.

 

225. Which of the planet moves fastest around the sun?

A. Venus
B. Mercury
C. Jupiter
D. None of these

Answer

Correct Answer: B. Mercury

Detail about MCQs

The planet that moves around the Sun at the highest speed is Mercury. Mercury is the closest planet to the Sun in our solar system, and it has the shortest orbital period. It takes approximately 88 Earth days for Mercury to complete one orbit around the Sun. The proximity to the Sun results in a higher orbital speed compared to the other planets in the solar system.

 

226. Which blood group is rare in the human body?

A. O Negative
B. AB Positive
C. AB Negative
D. None of these

Answer

Correct Answer: C. AB Negative

Detail about MCQs

AB Negative is considered a rare blood type in the human population. Blood types are classified based on the presence or absence of specific antigens on the surface of red blood cells and antibodies in the plasma. The AB Negative blood type is less common compared to some other blood types, such as O Positive or A Positive. Blood donation is crucial for maintaining an adequate supply of all blood types for medical treatments and emergencies.

 

227. What is the reason for the brown color of rust?

A. Reduction
B. Oxidation
C. Both a & b
D. None of these

Answer

Correct Answer: B. Oxidation

Detail about MCQs

The brown color of rust is primarily due to oxidation. Rust is a form of iron oxide that forms when iron or steel reacts with oxygen and moisture in the presence of air. In this process, iron undergoes oxidation, meaning it loses electrons, and oxygen is reduced, gaining electrons. The brown color of rust is a result of the presence of iron(III) oxide, which is formed during the oxidation of iron. Therefore, the correct answer is “Oxidation.”

 

228. Which of the following branch of zoology deals with the study of insects?

A. Ethology
B. Ornithology
C. Entomology
D. Herpetology

Answer

Correct Answer: C. Entomology

Detail about MCQs

The branch of zoology that deals with the study of insects is called “Entomology.” Entomology focuses on the scientific study of insects, including their anatomy, physiology, behavior, ecology, taxonomy, and evolution. Ethology is the study of animal behavior, ornithology is the study of birds, and herpetology is the study of amphibians and reptiles.

 

229. What does an airbag used for the safety of a car driver, contains?

A. Sodium Bicarbonate
B. Sodium Azide
C. Sodium Nitrate
D. Sodium Peroxide

Answer

Correct Answer: B. Sodium Azide

Detail about MCQs

Airbags used for the safety of a car driver typically contain sodium azide (NaN₃). Sodium azide undergoes a rapid chemical reaction when an electric current is passed through it, producing nitrogen gas. The rapid inflation of the airbag is a result of the generation of nitrogen gas, which helps cushion and protect the occupants during a collision by absorbing and distributing the impact force. The process is designed to be controlled and safe for the occupants of the vehicle.

 

230. Oil rises in a wick of oil lamp because of a property of matter, is called___?

A. Condensation
B. Capillary Action
C. Respiration
D. None of these

Answer

Correct Answer: B. Capillary Action

Detail about MCQs

The rise of oil in a wick of an oil lamp is due to a property of matter known as “capillary action.” Capillary action is the ability of a liquid to flow in narrow spaces without the assistance of, or against, external forces like gravity. In the case of an oil lamp wick, the capillary action draws the oil upward through the tiny spaces in the fibers of the wick, allowing it to be transported to the flame for combustion.

 

231. Smog is a case of?

A. Acid Rain
B. Air Pollution
C. Ozone Layer Thinning
D. None of these

Answer

Correct Answer: B. Air Pollution

Detail about MCQs

Smog is a case of “Air Pollution.” Smog is a type of air pollution that results from the interaction of pollutants, often from vehicle emissions and industrial activities, with sunlight. It can lead to the formation of ground-level ozone and particulate matter, causing harmful effects on human health and the environment. Smog is a visible haze that can occur in urban areas with high levels of pollution, and it can have detrimental effects on respiratory health and overall air quality.

 

232. The earth receives energy from the sun through?

A. Conduction
B. Radiation
C. Diffusion
D. Convection

Answer

Correct Answer: B. Radiation

Detail about MCQs

The Earth receives energy from the sun primarily through “Radiation.” The sun emits electromagnetic radiation, and this energy travels through the vacuum of space to reach the Earth. Once the solar radiation reaches the Earth’s atmosphere, it undergoes various processes, including absorption, reflection, and transmission, influencing the planet’s climate and supporting life on Earth.

 

233. The blue color of the clear sky is due to?

A. Diffraction of Light
B. Dispersion of Light
C. Reflection of Light
D. Refraction of Light

Answer

Correct Answer: B. Dispersion of Light

Detail about MCQs

The blue color of the sky is primarily due to the scattering of sunlight in the Earth’s atmosphere. However, if “Scattering of Light” is not listed as an option, “Dispersion of Light” can be considered a reasonable alternative. While dispersion is not the primary cause of the blue sky, it does involve the separation of colors in the spectrum, and it may play a role in certain atmospheric phenomena.

 

234. Which one is the most electronegative element?

A. Nitrogen
B. Oxygen
C. Chloride
D. Fluorine

Answer

Correct Answer: D. Fluorine

Detail about MCQs

Fluorine is the most electronegative element among the options given. Electronegativity is a measure of an atom’s ability to attract and hold electrons in a chemical bond. Fluorine, with an electronegativity value of 3.98 (on the Pauling scale), has the highest electronegativity among all the elements in the periodic table. It tends to attract electrons strongly when forming chemical bonds.

 

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