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

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Free download in PDF Class 11 Physics Chapter 9 Mechanical Properties of Solids Multiple Choice Questions and Answers for Board, JEE, NEET, AIIMS, JIPMER, IIT-JEE, AIEE and other competitive exams. MCQ Questions for Class 11 Physics with Answers were prepared based on the latest exam pattern. These short solved questions or quizzes are provided by Gkseries. These will help the students for preparation of their examination./p>

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(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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