MCQ for Class 11 Physics Chapter 9 Mechanical Properties of Solids with answer

MCQ for Class 11 Physics Chapter 9 : MCQs for Class 11 Physics Chapter 9 Mechanical Properties of Solids with Answers PDF Free Download prepared here according to the latest CBSE RBSE and Other State Board syllabus and NCERT Books.

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MCQ for Class 11 Physics Chapter 9 Mechanical Properties of Solids with answer

Q1. A body of mass 1 kg is attached to one end of a wire and rotated in horizontal circle of diameter 40 cm with a constant speed of 2 m/s. what is the area of cross-section of the wire if the stress developed in the wire is 5 × 106 N/m²?

(a) 2 mm²
(b) 3 mm²
(c) 4 mm²
(d) 5 mm²

(c) 4 mm²

Q2. In a wire, when elongation is 2 cm energy stored is E. if it is stretched by 10 cm, then the energy stored will be

(a) E
(b) 2 E
(c) 4 E
(d) 25 E

(d) 25 E

Q3. Two wires A and B are of the same length. The diameters are in the ratio 1 : 2 and the Youngs modulus are in ratio 2 : 1. if they are pulled by the same force, then their elongations will be in ratio

(a) 4 : 1
(b) 1 : 4
(c) 1 : 2
(d) 2 : 1

(d) 2 : 1

Q4. Hookes law essentially defines

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

(d) Elastic limit

Q5. Longitudinal strain is possible in the case of

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

(c) Only solids

Q6. Two wires have the same material and length, but their masses are in the ration of 4 : 3. If they are stretched by the same force, their elongations will be in the ratio of

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

(b) 3 : 4

Q7. A rubber cord of cross sectional area 1 mm² and unstretched length 10 cm is stretched to 12 cm and then released to project a stone of mass 5 gram. If Y for rubber = 5 ? 108N/m², then the tension in the rubber cord is

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

(c) 100 N

Q8. Out of the following materials, whose elasticity is independent of temperature?

(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

Q11. Four wires whose lengths and diameter respectively are given below are made of the same material. Which of these will have the largest extension when same tension is applied?

(a) 0.50 m, 0.50 mm
(b) 1.00 mm, 1.00 mm
(c) 2.00 m, 2.00 mm
(d) 4.00 m, 4.00 mm

(a) 0.50 m, 0.50 mm

Q12. If the length of a wire is reduced to half, then it can hold the

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

Q15. The restoring force per unit area is known as

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

a) stress

Q16. In magnitude hydraulic stress is equal to

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

a) hydraulic pressure

Q17.Substances which can be stretched to cause large strains are called

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

a) elastomer

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

Q19. Longidudinal stress depends on

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

Q22. 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

a) All of these

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