6.A solid sphere, a disc and a ring of the same mass and radius are allowed to roll down a frictinless inclined plane simultaneously from the same height. In this context, which one of the following statements is correct ?

7.Two bodies A and B are of some mass, and same amount of heat is given to both of them. If the temperature of A increases more than that fo B because of heat addition, then :

8.One Astronomical Unit is the average distance between

9.The working of potical fibres is based on the ................ of electromagnetic waves.

10.When milk is churned, the cream separates from it due to the :