Physics : Multiple-Choice Questions on Gravitation

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Physics: Multiple Choice Questions on Gravitation

A reference frame attached to the Earth

is an inertial frame by definition.

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

If the escape velocity of a rocket from the surface of the Earth is v_e , then the escape velocity of the same rocket from the surface of a planet whose acceleration due to gravity as well as radius are 4 times that of the Earth is

v_e

4 v_e

v_e / 4

16 v_e

If the value of gravitational acceleration at a height h above the Earth's surface is the same as that at a depth d below the Earth's surface (with both h and d small compared to the Earth's radius R), then

h = d

h = d / 2

h = d² / R

h = 2 d

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

reduce by a factor of 3

increase by a factor of 9

increase by a factor of 3

If the distance between two masses is increased by a factor of 4, the gravitational force of attraction between them will

reduce by a factor of 16

remain Same

increase by a factor of 4

reduce by a factor of 4

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