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Physics: Multiple Choice Questions on Gravitation


1.

If the radius of the Earth were increased by a factor of 3 and its mass remained the same, then the acceleration due to gravity on the Earth would

  reduce by a factor of 3

  reduce by a factor of 9

  increase by a factor of 9

  increase by a factor of 3

2.

A satellite orbits at a height h above the Earth's surface. Let R be the Earth's radius. If Ve is the escape velocity and Vo is the orbital velocity of the satellite orbiting at a height h << R, then

  Ve2 = 2 Vo2

  Ve = 2 Vo

  Ve = Vo

  Vo2 = 2 Ve2

3.

If a simple pendulum with a time period of 4 seconds is made to oscillate at a height R equal to the Earth's radius, then its time period at this height will be

  1 / 8 s

  4 s

  1 / 4 s

  8 s

4.

An Earth satellite of mass m revolves at a height h from the surface of the Earth. If R is the Earth's radius and g is the acceleration due to gravity at the surface of the Earth, then the velocity of the satellite is given by

 

 

 

 

5.

A planet is moving around the Sun in a circular orbit of circumference C. The work done on the planet by the gravitational force F of the Sun is

  FC/2

  Zero.

  F/C

  FC

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