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Physics: Multiple Choice Questions on Gravitation


1.

If a simple pendulum with a time period of 5 seconds is made to oscillate at a height R equal to the Earth's radius, then its time period at this height will be

  10 s

  1 / 5 s

  1 / 10 s

  5 s

2.

A reference frame attached to the Earth

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

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

  is an inertial frame by definition.

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

3.

The figure shows the elliptical orbit of a planet with the Sun at the focus. The areas of regions 1 and 2 are the same. If the planet takes times t1 to go from one end to the other end of region 1 and t2 to go from one end to the other end of region 2, then what is the relationship between t1 and t2?

  Cannot be determined

  t1 > t2

  t1 = t2

  t1 < t2

4.

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

  4 ve

  2 ve

  ve

5.

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 16

  increase by a factor of 4

  reduce by a factor of 4

  reduce by a factor of 16

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