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 mass of moon is about 0.012 times that of earth and its diameter is about 0.25 times that of earth. The value of G on the moon will be:

A. Less than that on the earth

B. More than that on the earth

C. Same as that on the earth

D. About one-sixth of that on the earth

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 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 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