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Physics: Multiple Choice Questions on Gravitation


1.

If a simple pendulum with a time period of 5 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 / 5 s

  1 / 10 s

  5 s

  10 s

2.

The ratio of the time periods for two satellites of equal mass in circular orbits of radii R and 4 R is

  1 : 4

  4 : 1

  8 : 1

  1 : 8

3.

If the value of gravitational acceleration at a height h above the Earth's surface is the same as that at a depth d below the Earth's surface (with both h and d small compared to the Earth's radius R), then

  h = d

  h = 2 d

  h = d2 / R

  h = d / 2

4.

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

  F/C

  FC/2

  FC

  Zero.

5.

If the distance between two masses is increased by a factor of 4, the gravitational force of attraction between them will

  increase by a factor of 4

  remain Same

  reduce by a factor of 4

  reduce by a factor of 16

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