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Physics: Multiple Choice Questions on Gravitation


1.

A reference frame attached to the Earth

  is an inertial frame by definition.

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

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

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

2.

A planet's density is 4 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

  R / 16

  4 R

  R / 4

  16 R

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

  regions 1 and 2

  region 1 and a portion of region 2

  region 2

  region 1

4.

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

  reduce by a factor of 5

  remain Same

  increase by a factor of 5

  reduce by a factor of 25

5.

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

  (R1 /R2)2

  R1 /R2

  R2 /R1

  (R2 /R1)2

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