# 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.

## 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

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

(iv) 25 E

(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

(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

(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

(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

(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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