Hooke’s Law MCQ and Stress-Strain Curve MCQ – Strength of Materials

31. The number of elastic constants for a completely anisotropic elastic material which follows Hooke’s law is?

  1. 25
  2. 21
  3. 4
  4. 3
Answer
Answer. b

32. Among the materials mentioned below the pronounced yield point is the characteristic of

  1. Cast-iron
  2. Structural steel
  3. Concrete
  4. Stone
Answer
Answer. b

33. A plastic member

  1. does not regain its original shape after removal of load producing deformation
  2. regains its original shape after removal of load producing deformation
  3. regains its original shape after removal of load producing deformation when heat it applied to it
  4. none of the above
Answer
Answer. a

34. Choose the correct statements from the following

  1. Hooke’s law is valid upto the limit of proportionality.
  2. Hooke’s law is valid up to elastic limit
  3. Limit of proportionality is always less than the elastic limit
  4. Limit of proportionality is either equal to or less than the elastic limit
  1. ii and iv
  2. i and iv
  3. ii and iii
  4. i and iii
Answer
Answer. b

35. The value of stress up to which a member regains its original shape or size after load removal is called

  1. Proportional limit
  2. Elastic limit
  3. Plastic limit
  4. Yield stress
Answer
Answer. b

36. The maximum stress that can be applied to a material for an infinite number of cycles of repeated stress without causing failure is called

  1. elastic limit
  2. proportional limit
  3. endurance limit
  4. ultimate strength
Answer
Answer. c

37. The strength at which steel fails under repeated load applications is known as

  1. Impact strength
  2. Tensile strength
  3. Yield strength
  4. Fatigue strength
Answer
Answer. d

38. Proof Resilience is the

  1. Maximum energy stored at elastic limit of a material
  2. Minimum energy stored at elastic limit of a material
  3. Average energy stored at elastic limit of a material
  4. None of the above
Answer
Answer. a

39. Under compression loading, what would be area under the stress-strain curve represent?

  1. Energy required to cause failure
  2. Elasticity of the material
  3. Breaking stress of the material
  4. Fatigue
Answer
Answer. a

40. The unit for modulus of resilience is

  1. Joule
  2. Joules/mm
  3. Joules/mm2
  4. Joules/mm3
Answer
Answer. d
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