# Chapter 9 Mechanical Properties of Solids

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### Exercise 1

•  Q4 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. Ans: (a) False (b) True (a) For a given stress, the strain in rubber is more than it is in steel. Young’s modulus, Y = stress / strain For a constant stress:  Y ∝ 1 / strain Hence, Young’s modulus for rubber is less than it is for steel. (b) 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.