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Physics: Multiple Choice Questions on Gravitation


1.

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?

  t1 < t2

  t1 = t2

  t1 > t2

  Cannot be determined

2.

An Earth satellite of mass m revolves at a height h from the surface of the Earth. If R is the Earth's radius and g is the acceleration due to gravity at the surface of the Earth, then the velocity of the satellite is given by

 

 

 

 

3.

If a simple pendulum with a time period of 4 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 / 4 s

  8 s

  1 / 8 s

  4 s

4.

A reference frame attached to the Earth

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

  is an inertial frame by definition.

  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.

5.

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

  FC/2

  Zero.

  F/C

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