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

- Proportional limit
- Elastic limit
- Yield point
- Ultimate stress

2. Hooke’s law is valid

- only above elastic limit
- only within elastic limit
- only within plastic limit
- till breaking of substance

3. Yield strength is

- stress required to produce certain arbitrary plastic deformation
- stress required to produce certain arbitrary elastic deformation
- stress required to cause fracture
- stress required to cause fatigue

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

- Limit of proportionally
- Elastic limit
- Yield point
- Ultimate strength point
- point of rupture.

The correct sequence of occurrence of these points is

- v-iv-iii-ii-i
- i-ii-iii-iv-v
- ii-i-iii-iv-v
- i-iii-ii-iv-v
- i-v-iv-ii-iii

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

- Elastic limit
- Plastic limit
- Elastic range
- Yield strength

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

- 5, 3
- 4, 3
- 4, 4
- 4, 2

7. Which of the following statements is incorrect?

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

8. Hooke’s law holds good upto

- Elastic limit
- Upper yield point
- Plastic limit
- Lower yield point

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

- Proportional limit
- Elastic limit
- Plastic limit
- Yield stress

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

- Elastic point
- Plastic point
- Breaking point
- Yielding point

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

- Breaking stress
- True stress
- Ultimate stress
- Yield stress

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

- Internal forces only
- External forces only
- Internal as well as external forces
- None of the above options

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

- Yield Point
- Rupture Point
- Limit of Proportionality
- Ultimate Point

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

- Cold working
- Hot working
- Quenching
- Galvanizing

15. Shape factor may be defined as the ratio of

- Elastic Modulus to Plastic Modulus
- Plastic Modulus to Rigidity Modulus
- Elastic Modulus to Lateral Strain
- 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

- 863.9 kN
- 86.39 kN
- 8.639 kN
- 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

- Yielding point
- Elastic point
- Breaking point
- Plastic point

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

- 2
- 1
- 9
- 3

19. What is tenacity?

- ultimate strength in tension
- ultimate strength in compressionn
- ultimate shear stress
- ultimate impact strength

20. For linear elastic systems displacement function varies

- linearly
- quadratically
- cubically
- quartically