aarekh of... · aarekh.com. 27. two bars of different materials are of the same size and are...

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1. The ability of the material to absorb energy till the breaking or rupture taken place is known as

(a) Hardness (b) Toughness (c) Brittleness (d) Softness [SSC JE - 2013]

2. Poisson's ratio is µ defined as the ratio of (a) axial strain to transverse strain (b) axial strain to shear strain (c) transverse strain to axial strain (a) shear strain to axial strain [SSC JE - 2013]

3. A linear force-deformation relation is obtained in materials (a) having elastic stress-strain property (b) having plastic stress-strain property (c) following Hooke's law (d) which are rigid elastic materials [SSC JE - 2014 (Evening Shift)]

4. The property of a material by which it can be beaten or rolled into plates, is called (a) malleability. (b) ductility (c) plasticity (d) elasticity [SSC JE - 2014 (Evening Shift)]

5. "Poisson's ratio" is defined as the ratio of (a) lateral strain to linear strain (b) linear strain to lateral strain (c) lateral stress to linear stress (d) linear stress to lateral stress [SSC JE - 2014 (Evening Shift)]

6. Which of the following has least carbon content ? (a) Wrought iron (b) Cast iron (c) Mild steel (d) Pig steel [SSC JE - 2014 (Morning Shift)]

7. Which of the following is a dimension less quantity ? (a) Shear force (b) Stress (c) Strain (d) Modulus of elasticity [SSC JE - 2014 (Morning Shift)]

8. The ratio of normal stress to normal strain within elastic limits is called : (a) Young's modulus (b) Shear modulus (c) Poisson's ratio (d) Bulk modulus [SSC JE - 2014 (Morning Shift)]

9. In a structure, cables and wires are used generally as: (a) To resist shear stress (b) Tension member (c) Compression member (d) Flexural member [SSC JE - 2014 (Morning Shift)]

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10. The limit to Poisson's ratio is:

(a) 0.25 (b) 0.15 (c) 0.50 (d) 0.65 [SSC JE - 2010]

11. Relation between Young's modulus (E) and modulus of rigidity (N) is given as

(a) E = 3N (1+ n) (b) E = 2N (1- n) (c) E = 2N (1+ n) (e) E = 3N (1- 2n) [SSC JE - 2010]

12. The modulus of elasticity of steel is

(a) 2 X 104 MPa (b) 1.2 X 105 MPa (c) 2 X 105 MPa (d) 2 X 106 MPa [SSC JE - 2011]

13. Identify the erroneous statement.

Mild steel (a) has two yield points. (b) is a ductile material. (c) has small percent elongation at failure (d) shows strain hardening. [SSC JE - 2011]

14. The maximum numerical value of Poisson's ratio is

(a) 0.0 (b) 0.25 (c) 0.50 (d) 1.00 [SSC JE - 2011]

15. The relationship between Young's modulus, E, shear modulus, G, and Poisson's ratio, n, is given by

(a) G = E / [2(1+n)] (b) E = G / [2(1+n)] (c) G = E / [2(1-n)] (d) G / (1+n) [SSC JE - 2011]

16. The modulus of elasticity of steel is more than that of concrete. It indicates that steel is

(a) less elastic (b) more elastic (c) more plastic (d) less plastic [SSC JE - 2011]

17. Hooke's law is valid up to

(a) Elastic limit (b) Yield point (c) Limit of proportionality (d) Ultimate point [SSC JE - 2012]

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18. The ability of a material to absorb energy till the elastic limit is known as (a) Elasticity (b) Malleability (c) Resilience (d) Ductility [SSC JE - 2012]

19. Out of the following, which is least elastic ? (a) Iron (b) Copper (c) Silver (d) Rubber [SSC JE - 2012]

20. Modulus of rigidity is defined as the ratio of

(a) longitudinal stress to longitudinal strain (b) shear stress to shear strain (c) stress to strain (d) stress to volumetric strain

21. If the Young's modulus of elasticity of a material is twice its modulus of rigidity, then the Poisson's ratio of the

material is (a) -1 (b) -0.5 (c) 0.5 (d) zero

22. Limit of proportionality depends upon

(a) area of cross-section (b) type of loading (c) type of material (d) all of the above

23. For an isotropic, homogeneous and elastic material obeying Hook's law, number of independent elastic constants is

(a) 2 (b) 3 (c) 9 (d) 1

24. The relationship between Young's modulus of elasticity E, bulk modulus K and Poisson's ratio µ is given by (a) E = 2K(1-2µ) (b) E = 3K(1+µ) (c) E = 3K(1-2µ) (d) E = 2K(1+µ)

25. Limiting values of Poisson's ratio are (a) E = -1 and 0.5 (b) E = -1 and -0.5 (c) E = 1 and -0.5 (d) E = 0 and 0.5

26. If a material has identical properties in all directions, It is said to be (a) homogeneous (b) isotropic (c) elastic (d) orthotropic

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27. Two bars of different materials are of the same size and are subjected ton same tensile forces. If the bars have unit

elongations in the ratio of 4 : 7, then the ratio of moduli of elasticity of the two materials is (a) 7 : 4 (b) 4 : 7 (c) 4 : 17 (d) 16 : 49

28. A prismatic bar of volume V is subjected to a tensile force in longitudinal direction. If Poisson's ration of material is µ and longitudinal strain is e, then the final volume of the bar becomes (a) (1 + e) (1-µ)2 V (b) (1 - e) (1+µ e) V (c) (1 + e) (1-µe)2 V (d) (1-µe)3 V

Answers :- 1. (b), 2. (c), 3. (c), 4. (a), 5. (a), 6. (a), 7. (c), 8. (a) 9. (b), 10. (c), 11. (c), 12. (a), 13. (c), 14. (c), 15. (a), 16. (b), 17. (c), 18. (c), 19. (d), 20. (b), 21. (d), 22. (c), 23. (a), 24. (c), 25. (d), 26. (b), 27. (a), 28. (c),

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