Question

(i) what is relative density? (ii)when we put a piece of cork in water, does it float or sink in water? give reason for your answer

Answer 1

Relative density is ratio of density of a substance to the density of water
cork floats because it has density less than that of water

Answer 2

(i) Relative density of a substance is the ratio of its density to that of water.
    It has no unit
    Relative Density = Density of sub./ density of water.

(ii) The cork will float bcoz density of cork is less than that of water..