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## Physics: Multiple Choice Questions on Gravitation

1.

A reference frame attached to the Earth
 is an inertial frame because Newton's laws of motion are applicable inside it. cannot be an inertial frame of reference because of the Earth's rotation and revolution. is an inertial frame by definition. is not an inertial frame because the Earth moves with respect to the Sun.

2.

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
 5 s 10 s 1 / 5 s 1 / 10 s

3.

Two planets of radii R1 and R2 have the same density. The ratio of their accelerations due to gravity at the surface is
 (R2 /R1)2 R2 /R1 R1 /R2 (R1 /R2)2

4.

 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

5.

If the radius of the Earth were increased by a factor of 3 and its mass remained the same, then the acceleration due to gravity on the Earth would
 reduce by a factor of 9 increase by a factor of 3 reduce by a factor of 3 increase by a factor of 9

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