# MCQ Questions for Class 11 Physics Chapter 9 Mechanical Properties of Solids with Answers

Here you will find NCERT MCQ Questions for Class 11 Physics with Answers PDF Free Download based on the important concepts and topics given in the textbook as per CBSE new exam pattern. This may assist you to understand and check your knowledge about the chapters. Students also can take a free test of the Multiple Choice Questions of Class 11 Physics. Each question has four options followed by the right answer. These MCQ Questions are selected supported by the newest exam pattern as announced by CBSE.

## Q1. If a glass prism is dipped in water, its dispersive power

(a) increases
(b) decreases
(c) does not change
(d) may increase or decrease depending on whether the angle of the prism is less than or greater than 60º

(b) decreases

## Q2. The objective of a telescope must be of large diameter in order to

(a) remove chromatic aberration
(b) remove spherical aberration and high magnification
(c) gather more light and for high resolution
(d) increase its range of observation

(c) gather more light and for high resolution

(a) 10 cm
(b) 15 cm
(c) 2.5 cm
(d) 5 cm

(d) 5 cm

## Q4. To increase the angular magnification of a simple microscope, one should increase

(a) the focal length of the lens
(b) the power of the lens
(c) the aperture of the lens
(d) the object size

(b) the power of the lens

## Q5. Longitudinal strain is possible in the case of

(a) Gases
(b) Liquid
(c) Only solids
(d) Only gases & liquids

(c) Only solids

(a) 2 : 3
(b) 3 : 4
(c) 4 : 3
(d) 9 : 16

(b) 3 : 4

(a) 25 N
(b) 50 N
(c) 100 N
(d) 200 N

(c) 100 N

(a) Copper
(b) Invar steel
(c) Brass
(d) Silver

(b) Invar steel

## Q9. An iron bar of length l m and cross section A m² is pulled by a force of F Newton from both ends so as to produce and elongation in meters. Which of the following statement statements is correct

(a) Elongation is inversely proportional to length l
(b) Elongation is directly proportional to cross section A
(c) Elongation is inversely proportional to A
(d) Elongation is directly proportional to Youngs modulus

(c) Elongation is inversely proportional to A

## Q10. The ratio of the change in dimension at right angles to the applied force to the initial dimension is known as

(a) Youngs modulus
(b) Poissons ratio
(c) Lateral strain
(d) Shearing strain

(c) Lateral strain

(a) 3 ft
(b) 4.5 ft
(c) 7.5 ft
(d) 6 ft

(a) 3 ft

## Q13. The Young’s modulus of a perfectly rigid body is

a) infinity
b) some finite non-zero constant
c) zero
d) unity

a) infinity

## Q14. According to Hooke’s law of elasticity, if stress is increased, then the ratio of stress to strain

a) remains constant
b) increases
c) becomes zero
d) decreases

a) remains constant

a) stress
b) plasticity
c) elasticity
d) strain

a) stress

## Q16. Which of the following phenomena is used in optical fibres ?

(a) Total internal reflection
(b) Scattering
(c) Diffraction
(d) Refraction

(a) Total internal reflection

## Q17. Critical angle of light passing from glass to water is minimum for

(a) red colour
(b) green colour
(c) yellow colour
(d) violet colour

(d) violet colour

## Q18. The reason for the change in shape of a regular body is

a) volume stress
b) shearing strain
c) longitudinal strain
d) metallic strain

a) volume stress

a) area
b) length
c) volume
d) mass

a) area

## Q20. Which of the following affects the elasticity of a substance?

a) All of the above
b) Impurity in substance
c) Change in temperature
d) Hammering and annealing

a) All of the above

## Q21. If the load is increased beyond the _ point, the strain increases rapidly for even a small change in the stress

a) yield point
b) fracture point
c) elastic point
d) plastic point

a) yield point

## Class 11 Physics MCQs Questions with Answers Chapter Wise

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