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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

  move radially outwards with a velocity V.

  spirally move away from the Earth.

  fall towards the surface of the Earth.

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

2.

The ratio of the time periods for two satellites of equal mass in circular orbits of radii R and 9 R is

  9 : 1

  1 : 9

  27 : 1

  1 : 27

3.

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

  increase by a factor of 5

  remain Same

  reduce by a factor of 5

  reduce by a factor of 25

4.

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 = 2 d

  h = d2 / R

  h = d

  h = d / 2

5.

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 / 4

  R / 2

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