A. themselves
B. herself
C. yourselves
D. itself

## A NOT gate can be implemented by which of the following?

A. A single transistor
B. A single resistor
C. A single diode
D. Two diodes

Correct Answer: A. A single transistor

## Which among the following is the property of Tungsten which makes it eligible to use in the bulbs?

A. highest melting point
B. highest resistance
C. Highest malleability
D. All are correct

Correct Answer: A. highest melting point

## 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

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

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.

## What is the orbital velocity of a satellite orbiting very close to the surface of earth?

A. 7.92 km/s
B. 9.8 km/s
C. 11.2 km/s
D. 14.8 km/s

In this case, the radius of the orbit will be nearly equal to the radius of earth. The orbital velocity of a satellite orbiting very close to the surface of earth is 7.92 km/s.

## The value of acceleration due to gravity is minimum on which of these planets?

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

The value of acceleration due to gravity is minimum on the planet Mercury and maximum on planet Jupiter.

## An orbital velocity of a satellite does not depend on:

B. Mass of the planet
D. Mass of the satellite

Correct Answer: D. Mass of the satellite

An orbital velocity of a satellite does not depend on the mass of the satellite. It depends on the mass and radius of the planet around which it is orbiting. Also, it depends on the radius of the orbit or the height of the satellite.

## What is the dimensional formula of work done?

A. M1 L1 T-1
B. M1 L2 T-1
C. M1 L-1 T-2
D. M1 L2 T-2

Correct Answer: D. M1 L2 T-2

The dimensional formula of work done is M1 L2 T-2. Work is said to be done by a force when the body is displaced actually through some distance in the direction of applied force. The S.I unit of Work is the joule.

## Work done is defined as the dot product of:

A. Force and acceleration
B. Force and area
C. Force and instantaneous velocity
D. Force and displacement