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# NCERT Solutions for Class 11 Physics Chapter 9 – Mechanical Properties of Solids

NCERT Solutions for Class 11 Physics Chapter 9 will enhance your understanding of the chapter and will help you score better marks in the exams. Chapter 9 includes topics like properties of solids, Hooke’s Law, Young’s Modulus, Shear Modulus, Poisson Ratio and Stress. There are 21 questions in the chapter that will help you practice these concepts. We have provided stepwise solutions to all these questions.

NCERT Solutions for Class 11 Physics Chapter 9 ‘Mechanical Properties of Solids ’ are prepared by highly trained Physics teachers at Instasolv. With the help of these solutions, you can revise the whole chapter quickly. You can understand how to solve questions related to this chapter and form a solid understanding of its concepts. Our solutions are designed as per the CBSE syllabus and exam pattern for your better performance in the exams.

## Important Topics for NCERT Solutions for Class 11 Physics Chapter 9

CBSE Class 11 Physics NCERT Solutions for chapter 9 is divided into 7 sub-sections namely the elastic behaviour of solids, stress and strain, Hooke’s Law, the stress-strain curve, elastic moduli and applications of elastic behaviour of materials.

Until now, you have studied that solids are in a fixed shape and cannot exhibit any elasticity. But, in this chapter, you will study that solids too have elasticity. This concept is explained in the section elastic behaviour of solids.

Then, Hooke’s Law is an important topic discussed in the chapter that will help you in higher studies as well. As per this law, the strain in a solid is proportional to the applied stress within the elastic limit of that solid. The cause and the effects of stress and strain are capable of being depicted in a curve figure, which is explained in the next section after Hooke’s Law.

Further revelations are in store for you as you proceed to learn the effect of stress and strain on solids. The concepts of stress and strain have been thoroughly and well explained with the examples of our day to day life. Apart from that the various types of stresses like a) Tensile Stress; b) Compressive Stress, c) Shearing or Tangential Stress, d) Longitudinal Stress, e) Shearing Strain Hydraulic Stress, and f) Volume Strain are some of the sub-topics that have been discussed in this chapter.

The concepts of Modulus Elasticity, Young’s Modulus, Poisson’s Ratio, Bulk Modulus, the Potentials of Elasticity in a Stretched Wire, and the Applications of Elastic Behavior of Metals have also been described in the concluding sections with suitable examples.

### Exercise-wise Discussion on NCERT Solutions for Class 11 Physics Chapter 9

• NCERT Class 11 Physics Chapter 9 has 2 exercises. The first exercise has 16 questions and the second exercise has 5 questions. All the questions are of numerical-type that require your proper understanding of the concepts of the chapter.
• In the first two questions, you are required to calculate Young’s Modulus. The third question is a graph-based question on stress.
• Then, the next few questions are based on the elongation of solids, strain and stress. The last few questions of exercise 1 are based on pressure.
• The additional exercise is related to pressure and stress topics.

### Benefits of NCERT Solutions for Class 11 Physics Chapter 9 by Instasolv

NCERT Solutions for Class 11 Physics Chapter 9 ‘Mechanical Properties of Solids’ by Instasolv provide you with 100% accurate and detailed explanation for every concept. All the answers are in a simple, easy to understand language and also facilitate your options for appropriate use of technical terms. Even from the CBSE exam point of view, our NCERT Solutions for Chapter 9 of Class 11 Physics will help you score top marks. Past experiences suggest that nearly 25% of the questions of Physics paper are from this Unit only. Hence, a clear understanding of this chapter will enable you to fare well in the exam.

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