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Class 11 Physics MCQ Questions of Mechanical Properties of Solids with Answers?

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Class 11 Physics MCQ Questions of Mechanical Properties of Solids with Answers are accessible here. The MCQ Questions for Class 11 Physics with answers have been set up according to the most recent Syllabus, NCERT Books, and exam pattern recommended in Class 11 by CBSE. 

Objective type Questions for a significant piece of exams for Class 11 Physics and whenever practiced appropriately can assist you with getting better marks. Refer to more Chapter-wise MCQ Questions for class 11 and furthermore access more most recent study material for all subjects. Just practice out the below MCQ Questions which are given here.

Practice MCQ Questions for class 11 Physics Chapter-Wise

1. Hookes law essentially defines

(a) Stress
(b) Strain
(c) Yield point
(d) Elastic limit

2. Longitudinal strain is possible in the case of

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

3. Out of the following materials, whose elasticity is independent of temperature?

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

4. 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

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

(a) Y
(b) η
(c) β
(d) K

6. When the intermolecular distance increases due to tensile force, then

(a) There is no force between the molecules
(b) There is a repulsive force between the molecules
(c) There is an attractive force between the molecules
(d) There is zero resultant force between the molecules

7. 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

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

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

9. 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

10. The restoring force per unit area is known as

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

11. In magnitude hydraulic stress is equal to

(a) hydraulic pressure
(b) hydraulic strain
(c) hydraulic force
(d) restoring force

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

(a) elastomer
(b) plastic
(c) ductile
(d) brittle

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

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

14. longitudinal stress is

(a) areal stress which changes the length of a body 
(b) normal stress which changes the length of a body
(c) shearing stress which changes the length of a body
(d) fracture stress which changes the length of a body

15. Which of the following affects the elasticity of a substance?

(a) All of the above
(b) Shear modulus
(c) Young's modulus
(d) All of the above

16. 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

17. The reciprocal of the bulk modulus is called

(a) compressibility
(b) volume stress
(c) modulus of rigidity
(d) volume strain

18. Shearing strain is expressed by

(a) angle of shear
(b) decrease in volume
(c) angle of twist
(d) increase in volume

19. Assertion: 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

20. Modulus of rigidity of ideal liquids is

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

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

(a) turbulent
(b) streamline
(c) steady
(d) very slow

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

(a) Energy
(b) Mass
(c) Linear momentum
(d) Angular momentum

23. When the temperature is raised, viscosity of the liquid decreases. This is because:

(a) volume of the solution decreases
(b) increase in temperature increases the average kinetic energy of the molecules which overcomes the attractive forces between them
(c) covalent and hydrogen bond forces decreases
(d) attraction between the molecule increases.

24. After terminal velocity is reached, the acceleration of a body falling through a fluid is

(a) zero
(b) equal to g
(c) less than g
(d) greater than g

25. Surface tension of a liquid is due to

(a) cohesive force between molecules
(b) adhesive force between molecules
(c) electrical force between molecules
(d) gravitational force between molecules

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Answer:

1. Answer: (d) Elastic limit

Explanation: Hooke's law is a principle which states that the force needed to extend or compress a spring by some distance is proportional to that distance. This proportionality constant defines the Elastic limit.

2. Answer: (c) Only solids

Explanation: Solids have definite shape and size and can stretch in length due to the force applied. Thus, longitudinal strain is only possible in solids and not possible in liquids and gases.

3. Answer: (b) Invar steel

Explanation: For most of the materials, elasticity decreases with temperature. One exception is invar steel.

4. Answer: (c) Elongation is inversely proportional to A

Explanation: :\(\Delta l=\frac{Fl}{AY}\) Thus, extension is inversely proportional to area.

5. Answer: (c) β

Explanation: The ratio of the change in dimension at right angles to the applied force to the initial dimension is known as β.

6. Answer: (b) There is a repulsive force between the molecules

Explanation: When the inter molecular distance increases due to tenisile force, there will be repulsive force between the molecules developed. 

7. Answer: (a) same load

Explanation: Breaking force ∝ area of cross-section of wire i.e. load hold by the wire does not depend upon the length of the wire.

8. Answer: (a) infinity

Explanation: The ratio of stress and strain is called young's modulus. For a perfectly rigid body, whatever may be the stress, strain will be always zero. So young's modulus will be infinite for a rigid body.

9. Answer: (a) remains constant

Explanation: Stresss/Strain = Constant .So, the ratio between stress and strain is always constant. So, if stress is increased, then strain changes in that way so that this ratio always remains constant.

10. Answer: (a) stress

Explanation: Hydraulic Stress is the restoring force per unit area when the force is applied by the fluid on the body.

11. Answer: (a) hydraulic pressure

Explanation: The internal restoring force per unit area in this case is known as hydraulic stress and its magnitude is equal to the hydraulic pressure (applied force per unit area.

12. Answer: (a) elastomer

Explanation: Substances which can be stretched to cause large strains are called elastomers e.g., tissue of aorta, rubber etc.

13. Answer: (b) shearing strain

Explanation: A body undergoes a change in shape without change in volume.

14. Answer: (b) normal stress which changes the length of a body

Explanation: Longitudinal stress is normal stress which changes the length of a body

15. Answer: (d) All of the above

Explanation: The elasticity of a substance is affected by Impurity of substance, Hammering and annealing, Change in temperature.

16. Answer: (d) None of these

Explanation: Shear modulus or modulus of rigidity is used to measure the rigidity of a body. The ratio of shear stress over shear strain is known as Shear modulus.

17. Answer: (a) compressibility

Explanation: The reciprocal of the bulk modulus is called the compressibility of the substance.

18. Answer: (a) angle of shear

Explanation: The Shearing strain is expressed as the tangent of the angle made to the perpendicular to the area of the surface under consideration. The Volume or bulk strain is the change in volume associated with the bulk pressure or stress on the material. We get that the Shearing strain is expressed by the angle of shear.

19. Answer: (a) Assertion is correct, reason is correct; reason is a correct explanation for assertion

Explanation: As steel is more elastic than copper more work has to be done in order to stretch the steel.

20. Answer: (a) zero

Explanation: Modulus of rigidity of ideal liquids is (b)zero. η = 0 in their case.

21. Answer: (a) turbulent

Explanation: Once the actual velocity of flow of liquid becomes greater than the critical velocity, the flow becomes turbulent.

22. Answer: (a) Energy

Explanation: In bernoulli theorem, mass, energy, linear momuntum, all the above quantities are conserved.

23. Answer: (b) increase in temperature increases the average kinetic energy of the molecules which overcomes the attractive forces between them

Explanation: When temperature increases, the energy level of liquid molecules increases (kinetic energy increases) and the distance between the molecule increases. It causes a decrease in inter-molecular attraction between them, which reduces viscosity.

24. Answer: (a) zero

Explanation: After terminal velocity is reached, the net acceleration of the body falling through a fluid is zero because the body after attaining terminal velocity will continue moving with same velocity through the viscous medium.

25. Answer: (a) cohesive force between molecules

Explanation: Its the cohesive force due to which surface molecules are attracted towards other similar molecules inside the surface, making the surface to behave like a stretched membrane. 

Click here to practice MCQ Questions for Mechanical Properties of Solids class 11

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