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Physics: Multiple Choice Questions on Gravitation


1.

A satellite is moving around the Earth in a circular orbit with a velocity V. If the gravitational force of the Earth were to suddenly disappear, then the satellite would

  spirally move away from the Earth.

  move with a velocity V, tangentially to its circular orbit.

  move radially outwards with a velocity V.

  fall towards the surface of the Earth.

2.

A planet's density is 2 times that of the Earth. But the acceleration due to gravity on its surface is exactly the same as on the Earth's surface. The radius of the planet in terms of the Earth's radius R is

  4 R

  2 R

  R / 2

  R / 4

3.

Consider a hole drilled into the Earth and an object placed at the bottom of the hole (point P) as shown in the figure. The gravitational force of attraction on the object will be due to

  region 1 and a portion of region 2

  regions 1 and 2

  region 1

  region 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

  FC/2

  F/C

  FC

  Zero.

5.

If a simple pendulum with a time period of 6 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 / 12 s

  6 s

  12 s

  1 / 6 s

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