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

1. According to Robert Hooke, stress is directly proportional to strain within

1. Proportional limit
2. Elastic limit
3. Yield point
4. Ultimate stress

2. Hooke’s law is valid

1. only above elastic limit
2. only within elastic limit
3. only within plastic limit
4. till breaking of substance

3. Yield strength is

1. stress required to produce certain arbitrary plastic deformation
2. stress required to produce certain arbitrary elastic deformation
3. stress required to cause fracture
4. stress required to cause fatigue

4. In a stress-strain plot, the following points appear

1. Limit of proportionally
2. Elastic limit
3. Yield point
4. Ultimate strength point
5. point of rupture.

The correct sequence of occurrence of these points is

1. v-iv-iii-ii-i
2. i-ii-iii-iv-v
3. ii-i-iii-iv-v
4. i-iii-ii-iv-v
5. i-v-iv-ii-iii

5. The region in the stress-strain curve between elastic limit and point of rupture is

1. Elastic limit
2. Plastic limit
3. Elastic range
4. Yield strength

6. Number of elastic constant and independent elastic constant for material are

1. 5, 3
2. 4, 3
3. 4, 4
4. 4, 2

7. Which of the following statements is incorrect?

1. Stress is directly proportional to strain within elastic limit
2. The stress is force per unit area
3. Hook’s law hold good up to the breaking point
4. The ratio of linear stress to linear strain is called Young’s Modulus.

8. Hooke’s law holds good upto

1. Elastic limit
2. Upper yield point
3. Plastic limit
4. Lower yield point

9. The property of a material by which it returns partially or completely to its initial shape after unloading is called

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

10. The stress at which extension of a material takes place more quickly as compared to the increase in load is called

1. Elastic point
2. Plastic point
3. Breaking point
4. Yielding point

11. The stress corresponding to the maximum load in stress-strain curve is called as

1. Breaking stress
2. True stress
3. Ultimate stress
4. Yield stress

12. The principle of virtual work can be applied to elastic system by considering the virtual work of

1. Internal forces only
2. External forces only
3. Internal as well as external forces
4. None of the above options

13. Modulus of toughness is the area of the stress-strain diagram upto

1. Yield Point
2. Rupture Point
3. Limit of Proportionality
4. Ultimate Point

14. Upper yielding point in a stress-strain curve of structural steel can be avoided by

1. Cold working
2. Hot working
3. Quenching
4. Galvanizing

15. Shape factor may be defined as the ratio of

1. Elastic Modulus to Plastic Modulus
2. Plastic Modulus to Rigidity Modulus
3. Elastic Modulus to Lateral Strain
4. Plastic Modulus to Elastic Modulus

16. The maximum permissible load on a steel bar of 20 mm diameter when the factor of safety is 1.8 and the ultimate stress is 495 MPa is

1. 863.9 kN
2. 86.39 kN
3. 8.639 kN
4. 0.86 kN

17. The stress at which extension of a material takes place more quickly as compared to the increase in load is called

1. Yielding point
2. Elastic point
3. Breaking point
4. Plastic point

18. For an isotropic, homogeneous and elastic material obeying Hooke’s law, number of independent elastic constant is

1. 2
2. 1
3. 9
4. 3

19. What is tenacity?

1. ultimate strength in tension
2. ultimate strength in compressionn
3. ultimate shear stress
4. ultimate impact strength