An apple of mass 100 g. falls from a tree because of gravitational attraction between the earth and the apple. If the magnitude of force exerted by the earth on the apple be F1 and the magnitude of force exerted by the apple on the earth be F2 then:

A. F1 is very much greater than F2

B. F2 is very much greater then F1

C. F1 is only a little greater than F2

D. F1 and F2 are exactly equal

In the relation F = G × M × m/d², the quantity G:

A. A depends on the value of g at the place of observation

B. Is used only when the earth is one of the two masses

C. Is the greatest on the surface of the Earth

D. Is of the same value irrespective of the place of observation

The gravitational force of attraction between two objects is x, Keeping the masses of the objects unchanged, if the distance between the objects is halved, then the magnitude of gravitational force between them will become:

A. x/4 B. x/2

C. 2x D. 4x

According to one of the Kepler’s laws of planetary motion:

A. r²∝ T³ B. r∝ T²

C. r³∝ T² D. r³∝

If the distance between two masses is increased by a factor of 5, by what factor would the m ass of one of them have to be altered to maintain the same gravitational force? Would there be an increase or decrease in the mass?