The force of attraction between two unit point masses separated by a unit distance is called:

A. Gravitational potential

B. Acceleration due to gravity

C. Gravitational field strength

D. Universal gravitational constant

The value of g on the surface of the moon:

A. Is the same as on the Earth

B. Is less than that on the Earth

C. Is more than that on the Earth

D. Keeps changing day by day

The atmosphere consisting of a large number of gases is held to the earth by:

A. Winds

B. Clouds

C. Earth’s magnetic field

D. Gravity

The weight of an object at the centre of the earth of radius R is:

A. Zero

B. R times the weight at the surface of the earth.

C. Infinite

D. 1/R² times the weight at the surface of the earth

Two objects of different masses falling freely near the surface of moon would:

A. Have same velocities at any instant

B. Have different accelerations

C. Experience forces of same magnitude

D. Undergo a change in their inertia