NCERT Class 11 Chapter 9 Physics Mechanical Properties of Solids MCQ

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Page 1 of 3

1. If the length of a wire is reduced to half, then it can hold the

A. same load

B. one fourth load

C. half load

D. double load

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

A. infinity

B. some finite non-zero constant

C. zero

D. unity

3. 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

4. The restoring force per unit area is known as

A. stress

B. plasticity

C. elasticity

D. strain

5. In magnitude hydraulic stress is equal to

A. hydraulic pressure

B. hydraulic strain

C. hydraulic force

D. restoring force

6. Substances which can be stretched to cause large strains are called

A. elastomer

B. plastic

C. ductile

D. brittle

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

A. volume stress

B. shearing strain

C. longitudinal strain

D. metallic strain

8. Longidudinal stress depends on

A. area

B. length

C. volume

D. mass

9. 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

10. 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

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11. Which of the following elastic moduli is used to describe the elastic behaviour of object as they respond to the deforming forces acting on them?

A. All of these

B. Shear modulus

C. Young's modulus

D. Bulk modulus

12. Which of the following is the correct relation? Y = Young's modulus & G = modulus of rigidity?

A. Y > G

B. None of these

C. Y < G

D. Y = G

13. The ratio of shearing stress to the corresponding shearing strain is called

A. modulus of rigidity

B. bulk modulus

C. Young's modulus

D. None of these

14. The reciprocal of the bulk modulus is called

A. compressibility

B. volume stress

C. modulus of rigidity

D. volume strain

15. Which of the following statements is/are wrong?
I. Hollow shaft is much stronger than a solid rod of same length and same mass.
II. Reciprocal of bulk modulus of elasticity is called compressibility.
III. It is difficult to twist a long rod as compared to small rod.

A. III only

B. III only

C. II and III

D. I and II

16. Shearing strain is expressed by

A. angle of shear

B. decrease in volume

C. angle of twist

D. increase in volume

17. A uniform cube is subjected to volume compression. If each side is decreased by 1%, then bulk strain is

A. 0.03

B. 0.02

C. 0.06

D. 0.01

18. Identical springs of steel and copper are equally stretched. More work will be done on the steel spring
Reason : Steel is more elastic than copper.

A. Assertion is correct, reason is correct; reason is a correct explanation for assertion

B. Assertion is correct, reason is correct; reason is not a correct explanation for assertion

C. Assertion is correct, reason is incorrect

D. Assertion is incorrect, reason is correct

19. The Poisson’s ratio of a material is 0.5. If a force is applied to a wire of this material, there is a decrease in the cross-sectional area by 4%. The percentage increase in the length is

A. 4%

B. 2.5%

C. 2%

D. 1%

20. Modulus of rigidity of ideal liquids is

A. zero

B. infinity

C. unity

D. some finite small non-zero constant value

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21. Beyond the critical speed, the flow of fluids becomes

A. turbulent

B. streamline

C. steady

D. very slow

22. For flow of a fluid to be turbulent

A. both

B. fluid should have high density

C. velocity should be large

D. None of these

23. In Bernoulli’s theorem which of the following is conserved?

A. Energy

B. Mass

C. Linear momentum

D. Angular momentum

24. A liquid is allowed to flow into a tube of truncated cone shape. Identify the correct statement from the following

A. the speed is low at the wider end and high at the narrow end.

B. the speed is high at the wider end and high at the narrow end

C. the speed is same at both ends in a stream line flow

D. the liquid flows with uniform velocity in the tube.

25. As the temperature of a liquid is raised, the coefficient of viscosity

A. decreases

B. increases

C. remains the same

D. may increase or decrease depending on the nature of liquid