11.Ratio of inertia force to elastic force is known as

12.According to the principle of buoyancy a body totally or partially immersed in a fluid will be lifted up by a force equal to

13.The centre of gravity of the volume of the liquid displaced by an immersed body is called

14.For a floating body to be in stable equilibrium, its metacentre should be

15.For a body floating in a liquid the normal pressure exerted by the liquid acts at