Question

Read the following two statements below carefully and state, with reasons, if it is true or false.

a) The Young’* modulus of rubber is greater than that of steel;

b) The stretching of a coil is determined by its shear modulus.

Answer 1

(a) False

(b) True

For a given stress, the strain in rubber is more than it is in steel.

Hence, Young’* modulus for rubber is less than it is for steel

Shear modulus is the ratio of the applied stress to the change in the shape of a body. The stretching of a coil changes its shape. Hence, shear modulus of elasticity is involved in this process.