Explanation of *tensile stress* and *Young’s modulus* were poorly stated by majority of the candidates. While many scored for valid additional information, many others failed to relate tensile stress with a wire or rod.

The expected answers are:

(a) *Tensile stress* is the ratio of force to cross-sectional area of a __wire/rod__

It is expressed in Newton per metre squared (Nm-2)

(b) *Young’s modulus* is the ratio of tensile stress to tensile strain. It is expressed in Newton per metre squared. (Nm-2)