Strength of Materials Quiz practies questions test1

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1. Modulus of rigidity is defined as the ratio of ______.
longitudinal stress to longitudinal strain	shear stress to shear strain
stress to strain	stress to volumetric strain

2. 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 _____.
-1	-0.5
0.5	zero

3. Limit of proportionality depends upon ______.
area of cross-section	type of loading
type of material	all of the above

4. For an isotropic, homogeneous and elastic material obeying Hooke's law, number of independent elastic constants is ______.
2	3
9	1

5. In a thin cylindrical shell, the ratio of longitudinal stress to hoop stress is ______.
0.5	1
2	4

6. If all the dimensions of a prismatic bar are doubled, then the maximum stress produced in it under its own weight will
decrease	remain unchanged
increase to two times	increase to four times

7. The relationship between Young's, modulus of elasticity E, bulk modulus K and Poisson's ratio u is given by _____.
E = 2K(l-2u.)	E = 3K(l + u)
E = 3K(l-2u)	E = 2K(l + u)

8. Limiting values of Poisson's ratio are _____.
- 1 and 0.5	-1 and -0.5
1 and - 0.5	0 and 0.5

9. The elongation of a conical bar under its own weight is equal to ______.
that of a prismatic bar of same length	one half that of a prismatic bar of same length
one third that of a prismatic bar of same length	one fourth that of a prismatic bar of same length

10. If a material has identical properties in all directions, it is said to be _____.
homogeneous	isotropic
elastic	orthotropic

11. Two bars of different materials are of the same size and are subjected to 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
7:4	4:7
4:17	16:49

12. A prismatic bar of volume V is subjected to a tensile force in longitudinal direction. If Poisson's ratio of the material is u and longitudinal strain is e, then the final volume of the bar becomes
(l + e)(l-u)2V	(l-e)2(l + ue)V
(l + e)(l-ne)2V	(l-ue)3V

13. If a composite bar of steel and copper is heated, then the copper bar will be under _____.
tension	compression
shear	torsion

14. Effective length of a weld is equal to ______.
overall length - weld size	overall length - throat thickness
overall length - 2 x weld size	overall length - 2 x throat thickness

15. Size of a right angled fillet weld is given by _____.
0.707 x throat thickness	0.414 x throat thickness
2.0 x throat thickness	throat thickness

16. The effective length of a fillet weld designed to transmit axial load shall not be less than _____.
2 x size of weld	4 x size of weld
6 x size of weld	10 x size of weld

17. Size of fillet weld with unequal legs is equal to _____.
smaller leg length	longer leg length
throat thickness	average of smaller and longer leg lengths

18. Weakest section in a fillet weld is ______.
throat of the fillet	smaller side
side parallel to force	side perpendicular to force

19. Effective throat thickness of a fillet weld is _____.
0.707 x size of weld	1.414 x size of weld
a function of the angle between fusion faces	equal to the side of the fillet

20. According to Unwin's formula, the dia¬meter of rivet in mm to suit the t mm thickness of plate is given by _____.
6t	6Vt
1.9-y/t	1.5 t+ 4