# Class 11 Physics Chapter 9: Mechanical Properties of Solids - NCERT Solutions

Welcome to the complete NCERT solutions for Class 11 Physics Chapter 9: Mechanical Properties of Solids. In this section, we provide detailed, easy-to-understand solutions for all the questions from this chapter. Whether you're preparing for exams or seeking a deeper understanding of the subject, these Mechanical Properties of Solids question answers will offer you valuable insights and explanations. Each solution is crafted to ensure conceptual clarity and step-by-step problem-solving methods, enabling students to grasp the core themes and excel in their academics.

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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.

### Key Features of NCERT Class 11 Physics Chapter 'Mechanical Properties of Solids' question answers :

• All chapter question answers with detailed explanations.
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• Aligned with the latest NCERT guidelines.
• Perfect for exam preparation and revision.