Question

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

(a) The Young’s 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’s 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.