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Physics: Multiple Choice Questions on Gravitation


1.

The ratio of the time periods for two satellites of equal mass in circular orbits of radii R and 16 R is

  1 : 64

  1 : 16

  16 : 1

  64 : 1

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

  Vo2 = 2 Ve2

  Ve = 2 Vo

  Ve2 = 2 Vo2

  Ve = Vo

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 = d2 / R

  h = d / 2

  h = 2 d

4.

If the radius of the Earth were increased by a factor of 2 and its mass remained the same, then the acceleration due to gravity on the Earth would

  increase by a factor of 4

  increase by a factor of 2

  reduce by a factor of 4

  reduce by a factor of 2

5.

If the distance between two masses is increased by a factor of 5, the gravitational force of attraction between them will

  reduce by a factor of 25

  increase by a factor of 5

  remain Same

  reduce by a factor of 5

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