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

21. The principle of superposition is valid only for

1. Any elastic materials
2. All metals
3. Linear elastic materials
4. Homogeneous materials

22. The phenomenon of the decreased resistance of a material to repeated stresses is called

1. creep
2. fatigue
3. melting
4. freezing

23. Modular ratio of the two materials is the ratio of

1. Linear stress to linear strain
2. Shear stress to shear strain
3. Their modulus of elasticity’s
4. Their modulus of rigidities

24. The ability of a material to absorb energy within the elastic range

1. Elasticity
2. Toughness
3. Resilience
4. Stiffness

25. In mild steel specimens subjected to tensile test cycle, the elastic limit in tension is raised and the elastic limit in compression is lowered. This is called

1. Annealing effect
2. Bauschinger effect
3. Strain rate effect
4. Fatigue effect

26. The stress at which a material fractures under large number of reversal of stresses is called

1. Creep
2. Residual stress
3. Ultimate stress
4. Endurance limit

27. The principle of superposition is not applicable when

1. The material does not obey Hooke’s law
2. The effect of temperature changes is taken into consideration
3. The structure is being analysed for the effect of support settlement

Which of these statement(s) is/are correct?

1. i only
2. i and ii
3. ii and iii
4. i, ii, and iii

28. 0.2 percent proof stress means

1. stress corresponding to 0.2 percent strain
2. 0.2 percent of ultimate stress
3. stress at which if unloading is made, there will be 0.2 percent permanent strain
4. None of the above

29. In case of brittle materials, the ratio of ultimate compressive stress to ultimate tensile stress is

1. equal to 1
2. more than 1
3. less than 1
4. maybe anything. No definite relation exists

30. Every material obeys Hooke’s law within its

1. Elastic limit
2. Plastic limit
3. Limit of proportionality
4. None of these