The value of gravitational constant G changes with the change in :

1. height
2. place
3. distance
4. it remains unchanged

The gravitational force between two masses is :

1. directly proportional to the product of the masses
2. inversely proportional to the square of the separation between them
3. significant between heavenly bodies, but is insignificant between atomic bodies.
4. all of the above

The gravitational force of attraction between two bodies of masses 60 kg and 40 kg separated by a distance 10 m is : (where G = 6.7 x 10^-11 Nm²kg^-2 )

1. 1.60 x 10^-9 N
2. 2.8 x 10^-11 N
3. 1.0 x 10^-11 N
4. 1.6 x 10^-11 N

The S.I. unit of g is :

1. m s^-1
2. m s^-2
3. cm s^-1
4. cm s^-2