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Physics: Multiple Choice Questions on Gravitation


1.

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 5 times that of the Earth is

  5 ve

  ve

  ve / 5

  25 ve

2.

A reference frame attached to the Earth

  cannot be an inertial frame of reference because of the Earth's rotation and revolution.

  is not an inertial frame because the Earth moves with respect to the Sun.

  is an inertial frame by definition.

  is an inertial frame because Newton's laws of motion are applicable inside it.

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 = d / 2

  h = d

  h = 2 d

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

  Zero.

  FC/2

  FC

  F/C

5.

Two satellites of masses M1 and M2 have escape velocities V1 and V2 from the surface of a planet of radius R with acceleration due to gravity g. Which of the following is true?

  V1 / V2 = M1 / M2

  V1 / V2 = M2 / M1

  V1 = V2

  V1 / V2 = (M2 / M1)2

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