NCERT Solutions for class 11 Physics | Chapter 9 - Mechanical Properties of Solids

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Questions
1 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.

Answer:the speed is low at the wider end and high at the narrow end.
2 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

Answer:0.03
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3 Beyond the critical speed, the flow of fluids becomes
A turbulent
B streamline
C steady
D very slow

Answer:turbulent
4 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

Answer:both
5 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

Answer:Assertion is correct, reason is correct; reason is a correct explanation for assertion
6 The reciprocal of the bulk modulus is called
A compressibility
B volume stress
C modulus of rigidity
D volume strain

Answer:compressibility
7 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

Answer:All of these
8 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

Answer:modulus of rigidity
9 Which of the following affects the elasticity of a substance?
A Impurity in substance
B Change in temperature
C Hammering and annealing
D All of the above

Answer:All of the above
10 Substances which can be stretched to cause large strains are called
A elastomer
B plastic
C ductile
D brittle

Answer:elastomer
11 In magnitude hydraulic stress is equal to
A hydraulic pressure
B hydraulic strain
C hydraulic force
D restoring force

Answer:hydraulic pressure
12 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

Answer:yield point
13 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

Answer:Y > G.
14 The Young’s modulus of a perfectly rigid body is
A infinity
B some finite non-zero constant
C zero
D unity

Answer:infinity
15 The restoring force per unit area is known as
A stress
B plasticity
C elasticity
D strain

Answer:stress
16 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

Answer:same load
17 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

Answer:decreases
18 Shearing strain is expressed by
A angle of shear
B decrease in volume
C angle of twist
D increase in volume

Answer:angle of shear
19 Longidudinal stress depends on
A area
B length
C volume
D mass

Answer:area
20 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

Answer:remains constant

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