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.

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

Answer

Correct Answer: A. 7.92 km/s

Detailed About MCQs

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.

An orbital velocity of a satellite does not depend on:

A. Radius of the planet
B. Mass of the planet
C. Radius of orbit
D. Mass of the satellite

Answer

Correct Answer: D. Mass of the satellite

Detailed About MCQs

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.

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

Answer

Correct Answer: D. Force and displacement

Detailed About MCQs

Work done is defined as the dot product of Force vector and displacement vector. W = F.s Work done is a scalar quantity. Note: Instantaneous power is defined as the dot product of the Force vector and instantaneous velocity.

What is the apparent weight of the person when the elevator is accelerating downwards?

A. equal to the actual weight
B. greater than the actual weight
C. less than the actual weight
D. Zero

Answer

Correct Answer: C. less than the actual weight

Detailed About MCQs

The apparent weight of the person becomes less than the actual weight when the elevator is accelerating downwards. The apparent weight of the person becomes more than the actual weight when the elevator is accelerating upwards.