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Physics: Multiple Choice Questions on Gravitation


1.

If the radius of the Earth were increased by a factor of 4 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 16

  reduce by a factor of 16

  reduce by a factor of 4

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

  Ve = Vo

  Vo2 = 2 Ve2

  Ve = 2 Vo

  Ve2 = 2 Vo2

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 = d2 / R

  h = 2 d

  h = d

  h = d / 2

4.

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 5

  increase by a factor of 5

  reduce by a factor of 25

  remain Same

5.

If the escape velocity of a rocket from the surface of the Earth is ve , then the escape velocity of the same rocket from the surface of a planet whose acceleration due to gravity as well as radius are 2 times that of the Earth is

  ve / 2

  ve

  2 ve

  4 ve

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