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

NCERTCOURSE.COM given here the NCERT chapter-wise Multiple Choice Questions from Class 11 Physics book Chapter 9 Mechanical Properties of Solids with Answers Pdf free download. 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 Mechanical Properties of Solids. 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.

MCQ Class 11 Physics Chapter 9 With Answers

Q1. The breaking stress for wire of unit area of cross-section is called its:

(i) Young’s modulus
(ii) tensile strength
(iii) yield point
(iv) elastic limit

(ii) tensile strength

Q2. Longitudinal strain is possible in the case of

(i) Gases
(ii) Liquid
(iii) Only solids
(iv) Only gases & liquids

(iii) Only solids

Q3. 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

(i) E
(ii) 2 E
(iii) 4 E
(iv) 25 E

(iv) 25 E

Q4. If the length of a wire is reduced to half, then it can hold the

(i) same load
(ii) one fourth load
(iii) half load
(iv) double load

(i) same load

Q5. The substance which shows no elastic after effect practically is

(i) steel
(ii) rubber
(iii) copper
(iv) quartz

(iv) quartz

Q6. The change in the shape of a regular boy is due to

(i) Bulk strain
(ii) Shearing strain
(iii) Longitudinal strain
(iv) Volume strain

(ii) Shearing strain

Q7. The radii of two wires of a same material are in ratio 2 : 1. if the wires are stretched by equal forces, the stress produced in them will be

(i) 2 : 1
(ii) 4 : 1
(iii) 1 : 4
(iv) 1 : 2

(iii) 1 : 4

Q8. In magnitude hydraulic stress is equal to

(i) hydraulic pressure
(ii) hydraulic strain
(iii) hydraulic force
(iv) restoring force

(i) hydraulic pressure

Q9. If both the length and radius of the wire are doubled, then how does the modulus of elasticity change?

(i) doubled
(ii) halved
(iii) becomes one fourth
(iv) remains unchanged

(iv) remains unchanged

Q10. What is the energy stored per unit volume in a copper wire, which produces longitudinal strain of 0.1%. [Y = 1.1 × 1011 N/m²]

(i) 11 × 103 J/m³
(ii) 5.5 × 103 J/m³
(iii) 11 × 104 J/m³
(iv) 5.5 × 104 J/m³

(iv) 5.5 × 104 J/m³

Q11. The ratio of the change in dimension at right angles to the applied force to the initial dimension is known as

(i) Youngs modulus
(ii) Poissons ratio
(iii) Lateral strain
(iv) Shearing strain

(iii) Lateral strain

Q12. Longidudinal stress depends on

(i) area
(ii) length
(iii) volume
(iv) mass

(i) area

Q13. The bulk modulus of a perfectly rigid body is

(i) one
(ii) infinity
(iii) zero
(iv) none of the above

(ii) infinity

Q14. When impurities are added to an elastic substance, its elasticity

(i) Increases
(ii) Decreases
(iii) Becomes zero
(iv) May increase or decrease

(iv) May increase or decrease

Q15. When the intermolecular distance increases due to tensile force, then

(i) There is no force between the molecules
(ii) There is a repulsive force between the molecules
(iii) There is an attractive force between the molecules
(iv) There is zero resultant force between the molecules

(iii) There is an attractive force between the molecules

Q16. 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?

(i) Bulk modulus
(ii) Shear modulus
(iii) Young’s modulus
(iv) All of these

(iv) All of these

Q17. The modulus of rigidity of water is

(i) one
(ii) infinity
(iii) zero
(iv) none of the above

(iii) zero

Q18. If a material is heated and annealed, then its elasticity is

(i) Increased
(ii) Decreased
(iii) Not change
(iv) Becomes zero

(ii) Decreased

Q19. Out of the following materials, whose elasticity is independent of temperature?

(i) Copper
(ii) Invar steel
(iii) Brass
(iv) Silver

(ii) Invar steel

Q20. The ratio of shearing stress to the corresponding shearing strain is called

(i) modulus of rigidity
(ii) bulk modulus
(iii) Young’s modulus
(iv) None of these

(i) modulus of rigidity

Q21. For obtaining appreciable extension, the wire must be

(i) short and thin
(ii) long and thick
(iii) long and thin
(iv) short and thick

(iii) long and thin

Q22. Out of the following materials, whose elasticity is independent of temperature?

(i) Copper
(ii) Invar steel
(iii) Brass
(iv) Silver

(ii) Invar steel

  • Q23. 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

(i) 4 : 1
(ii) 1 : 4
(iii) 1 : 2
(iv) 2 : 1

(iv) 2 : 1

Q24. Shearing strain is expressed by

(i) angle of shear
(ii) decrease in volume
(iii) angle of twist
(iv) increase in volume

(i) angle of shear

Q25. A cable breaks if stretched by more than 2 mm. It is cut into two equal parts. By how much either part can be stretched without breaking?

(i) 2mm
(ii) 1 mm
(iii) 0.5 mm
(iv) 0.25 mm

(ii) 1 mm

Q26. Theoretical value of Poissions ratio lies between

(i) -1 to 0.5
(ii) -1 to -2
(iii) 0.5 to 1
(iv) None

(i) -1 to 0.5

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Class 11 Physics MCQ Questions Chapter wise with Answers

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