Gravitation Tes...

If the radius of the earth is reduced to half of its present value, with no change in the mass, the acceleration due to gravity will be:

Two particles are kept at a separation $$r$$. The gravitational force between them is proportional to

Which statement is correct?

On the surface of the Moon

The gravitational force attraction between two spherical bodies, each of mass $$1\ kg$$ placed at $$10\ m$$ apart ( $$G=6.67\times 10^{-11}\ Nm^2/kg^2$$) is :

The gravitational force of attraction between two spherical bodies, each of mass $$100\ kg$$, if the distance between their centres is $$100\ m$$, is :
( $$G=6.67\times 10^{-11}\ Nm^2\ kg^{-2}$$)

Archimedes' principle states that when a body is totally or partially immersed in a fluid, the upthrust is equal to:

The gravitational force between two objects is $$F$$. If masses of both objects are halved without changing distance between them, then the gravitational force would become

Two particles are placed at some distance. If the mass of each of the two particles is doubled, keeping the distance between them unchanged, the value of gravitational force between them will be 

The unit of thrust is