Gravitation Tes...

'Weight' of a body may have the following attributes.
I. It is the gravitational force acting on a body at the earth's surface
II. It is independent of the mass of the body
III. The body feels weightlessness during free fall
IV. It is different at different places on earth's surface.

An aluminium sphere is dipped into water. Which of the following is true?

The value of universal gravitational constant on earth for a particle of mass 5 kg is 

Two identical particles of mass $$m$$ are placed at a distance $$r$$ from each other. If their separation is doubled, then the effect on gravitational constant will be 

Which of the following statements is correct regarding the universal gravitational constant G?

If the gravitational constant is expressed in terms of $$dynes\ m^{-2} kg^{2}$$, how will the value of G change:

If the radius of the earth decreases by $$10\%$$, the mass remaining unchanged, what will happen to the acceleration due to gravity?

Which of the following combination is true about the mass of a body according to Newton?
I. Mass is the quantity of matter contained in a body
II. Mass is represented by the relation: mass $$=\displaystyle\frac{force}{velocity}$$
III. Mass is always conserved
IV. Mass of a body is the ratio of its weight to acceleration due to gravity at a particular place.

What is the range of gravitational force. ?

The radii of two planets are $${ R }_{ 1 }$$ and $${ R }_{ 2 }$$ respectively and their densities are $${ \rho }_{ 1 }$$ and $${ \rho }_{ 2 }$$ respectively. The ratio of the accelerations due to gravity $$\dfrac{{ g }_{ 1 }}{{ g }_{ 2 }}$$ at their surfaces is