Which chemical is also known as “Chinese snow”?

A. Silver iodide
B. Potassium nitrate
C. Ammonium chloride
D. Sodium phosphate

Answer

Correct Answer: B. Potassium nitrate

Detailed About MCQs

Potassium nitrate is one of several nitrogen-containing compounds collectively referred to as saltpeter. It is also known as “Chinese snow”. Major uses of potassium nitrate are in fertilizers, rocket propellants, and fireworks.

“Atoms can neither be created nor destroyed.” This principle was given by:

A. Avogadro
B. Dalton
C. Rutherford
D. Niels Bohr

Answer

Correct Answer: B. Dalton

Detailed About MCQs

The given principle is one of the postulates of Dalton’s atomic theory given in 1803 by John Dalton. The postulates of Dalton’s atomic theory are as follows:
1. Elements consist of indivisible small particles (atoms).
2. All atoms of the same element are identical; different elements have different types of atom.
3. Atoms can neither be created nor destroyed. 

The term “white coal” sometimes referred to which of the following?

A. Geothermal Electricity
B. Wind Energy
C. Hydroelectricity
D. Biomass Energy

Answer

Correct Answer: C. Hydroelectricity

Detailed About MCQs

The term white coal was used for Hydroelectricity, particularly in Europe, because of its capability to produce more energy than any other source except coal. The term was coined by a French Engineer Aristide Bèrges.

A Gold Ring which is 50% pure. Its purity can be alternatively shown as:

A. 18 Carat
B. 18 Karat
C. 12 Carat
D. 12 Karat

Answer

Correct Answer: D. 12 Karat

Detailed About MCQs

The carat is the common unit used to describe the mass of a gem. A 1-carat diamond, for example, has a mass of 0.20 g. The karat is the common unit used to describe the purity of precious metals, such as gold. A 24-karat gold ring is as pure as can be. A gold ring that is 50 % pure is 12 karat.

What is the stress known as when there is a relative displacement between various layers of solid?

A. Tangential
B. Linear
C. Lateral
D. Longitudinal

Answer

Correct Answer: A. Tangential

Detailed About MCQs

When successive layers of solid move on each other i.e. when there is a relative displacement between various layers of solid, the stress produced is called as Tangential stress.

By how much the orbital velocity of Moon has to increase for it to cease to remain the earth’s satellite?

A. 2 times
B. 3 times
C. √2 times
D. √3 times

Answer

Correct Answer: C. √2 times

Detailed About MCQs

If the speed of a satellite orbiting close to the earth is made √2 times (or increased by 41%) then it will escape from the gravitational field. Moon is a natural satellite of the earth.