In This Post we are providing Chapter-9 Mechanical Properties of Solids NCERT MCQ for Class 11 Physics which will be beneficial for students. These solutions are updated according to 2021-22 syllabus. These MCQS can be really helpful in the preparation of Board exams and will provide you with a brief knowledge of the chapter.
NCERT MCQ ON MECHANICAL PROPERTIES OF SOLIDS
Question 1: 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
Question 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
Question 3:
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
Question 4: The Poisson’s ratio of a material is 0.5. If a force is applied to a wire of this material, there is a decrease in the cross-sectional area by 4%. The percentage increase in the length is
- a) 4%
- b) 2.5%
- c) 2%
- d) 1%
Answer: 4%
Question 5: Modulus of rigidity of ideal liquids is
- a) zero
- b) infinity
- c) unity
- d) some finite small non-zero constant value
Answer: zero
Question 6: Beyond the critical speed, the flow of fluids becomes
- a) turbulent
- b) streamline
- c) steady
- d) very slow
Answer: turbulent
Question 7: Streamline flow is more likely for liquids with
- a) low density and high viscosity
- b) low density and high viscosity
- c) high density and high viscosity
- d) high density and high viscosity
Answer: low density and high viscosity
Question 8: 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
Question 9: In Bernoulli’s theorem which of the following is conserved?
- a) Energy
- b) Mass
- c) Linear momentum
- d) Angular momentum
Answer: Energy
Question 10: 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.
Question 11: 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
Question 12: After terminal velocity is reached, the acceleration of a body falling through a fluid is
- a) zero
- b) equal to g
- c) less than g
- d) greater than g
Answer: zero
Question 13: Terminal velocity of ball depends on
- a) density difference of liquid and ball
- b) density of ball only
- c) density of liquid only
- d) area of the ball
Answer: density difference of liquid and ball
Question 14: Surface tension of a liquid is due to
- a) cohesive force between molecules
- b) adhesive force between molecules
- c) electrical force between molecules
- d) gravitational force between molecules
Answer: cohesive force between molecules
Question 15: If a soap bubble formed at the end of the tube is blown very slowly, then the graph between excess pressure inside the bubble with time will be a
- a) parabolic curve sloping down
- b) parabolic curve sloping up
- c) straight line sloping down
- d) straight line sloping up
Answer: parabolic curve sloping down
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