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Physics: Multiple Choice Questions on Gravitation


1.

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

  region 1 and a portion of region 2

  region 2

2.

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

  F/C

  FC

  FC/2

  Zero.

3.

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 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.

4.

If the distance between two masses is increased by a factor of 2, the gravitational force of attraction between them will

  remain Same

  reduce by a factor of 2

  increase by a factor of 2

  reduce by a factor of 4

5.

If the radius of the Earth were increased by a factor of 5 and its mass remained the same, then the acceleration due to gravity on the Earth would

  increase by a factor of 5

  increase by a factor of 25

  reduce by a factor of 25

  reduce by a factor of 5

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