1. In a tensile test of specimen,the ratio of maximum load to the original cross sectional area of test piece is called
Correct : B. ultimate stress
2. In a body, thermal stress is one which arises because of the existence of
Correct : B. temperature gradient
3. A localized compressive stress at the area of contact between the two surfaces is called as
Correct : C. bearing stress
4. The ratio between change in volume to original volume of body is called
………… strain.
Correct : D. volumetric
5. There is always a limiting value of load up to which the strain totally disappears on the removal of load; the stress corresponding to this load is called…………
Correct : A. elastic limit
6. Robert Hooke discovered experimentally that within elastic limit
Correct : C. stress/strain = constant
7. When a tensile or compressive force (P) acts on a body, the change in its length is given by
Correct : A. pl/ae
8. Modulus of elasticity is defined as the ratio of
Correct : B. linear stress to linear strain
9. The ratio of linear strain to lateral strain is known as
Correct : D. none of above
10. The ratio of lateral strain to linear strain is known as
Correct : C. poisson's ratio
11. The relation between E (modulus of elasticity) and C (modulus of rigidity) is given by
Correct : B. e =2 c (1+µ)
12. The relation between E (modulus of elasticity) and K (bulk modulus of elasticity) is given by
Correct : C. e=3k(1-2µ)
13. Relation between E, K and C is given by
Correct : A. e=9kc/(3k+c)
14. Which of the following statement is incorrect?
Correct : C. hooke's law holds good up to the breaking point
15. When a bar is subjected to a change of temperature and its deformation is prevented, which of the following stress is induced?
Correct : A. thermal stress
16. Temperature stress developed in a bar depends on which of the following?
Correct : D. all of above
17. The temperature strain in a bar is ……………..proportional to the change in
temperature.
Correct : A. directly
18. …………….Strain is the deformation of the bar per unit length in the
direction of force.
Correct : D. linear
19. Strain in a direction at right angles to the direction of applied force is known as
Correct : A. lateral strain
20. A localized compressive stress at the area of contact between two members
is known as ……………..stress.
Correct : B. crushing
21. A material with identical properties in all directions is known as
Correct : A. homogeneous
22. The units of stress in the SI system are
Correct : B. n/m2
23. In a lap riveted joint the rivets are mainly subjected to --------------stress
Correct : A. shear
24. The resistance to deformation of a body per unit area is known as
Correct : A. stress
25. stress developed due to external force in an elastic material
Correct : B. does not depend on elastic constants
26. Strain is defined as deformation per unit
Correct : B. length
27. The units of modulus of elasticity are the same as of
Correct : D. any of the above
28. Approximate value of Young's modulus for mild steel is
Correct : C. 205gpa
29. 1MPa is equal to
Correct : B. 1 n/mm2
30. Temperature stress is a function of
Correct : D. all of the above
31. Factor of safety is defined as ratio of
Correct : A. ultimate stress to allowable stress
32. The stress at which elongation of a material is quite large as compared to increase in load is known as
Correct : B. yield point
33. Poisson's ratio is defined as ratio of
Correct : B. transverse strain to axial strain
34. During free expansion due to temperature rise or fall,
Correct : A. no stress is developed
35. For any material, the maximum value of
E in terms of G is E =
Correct : C. 3g
36. For any material, the minimum value of E in terms of G is E
Correct : B. 2g
37. Two materials are having modulus of elasticity, modulus of rigidities and bulk modulus as (E1, E2), (C1, C2), and (K1, K2). The modulus ratio is given by
Correct : C. e1/e2
38. The force
Correct : A. stiffness
39. Thermal stress is developed in a temperature when _.
Correct : B. not allowed to expand freely
40. Which of the following beams will develop thermal stress when subjected to a change in temperature ?
Correct : B. beam with hinges at both ends
41. Change in length of a rod due to change in depend on _.
Correct : C. modulus of elasticity
42. A steel strip is welded to a copper strip of the same dimensions along the length. The coefficient of thermal expansion for copper is greater than that for steel. If temperature is increased, ___ .
Correct : B. steel has tensile stress
43. While punching a hole in a metal sheet using a punch, stress is developed in the metal sheet.
Correct : C. shear
44. While punching a hole in a metal sheet using a punch, stress is developed in the Punch.
Correct : A. normal compressive
45. Poisson’s ratio for rubber is……that for steel.
Correct : A. larger than
46. For a certain material, the Poisson's ratio is 0. The relation between modulus of elasticity E and the bulk modulus K is E = ____ _.
Correct : B. 3k
47. For a certain material, E = 3K . The value of Poisson's ratio for the material will be__ _.
Correct : A. 0
48. Modulus of rigidity is defined as the ratio of
Correct : B. shear stress to shear strain
49. 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
Correct : D. zero
50. Limit of proportionality depends upon
Correct : C. type of material
51. For an isotropic, homogeneous and elastic material obeying Hooke's law, number of
independent elastic constants is
Correct : A. 2
52. In a thin cylindrical shell, the ratio of longitudinal stress to hoop stress is
Correct : C. 2
53. If all the dimensions of a prismatic bar are doubled, then the maximum stress produced in it
under its own weight will
Correct : C. increase to two times
54. The relationship between Young's, modulus of elasticity E, bulk modulus K and Poisson's
ratio u is given by
Correct : C. E = 3K(l-2u)
55. Limiting values of Poisson's ratio are
Correct : A. - 1 and 0.5
56. The elongation of a conical bar under its own weight is equal to
Correct : C. one third that of a prismatic bar of same length
57. If a material has identical properties in all directions, it is said to be
Correct : B. isotropic
58. 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
Correct : A. 7:4
59. 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
Correct : C. (l + e)(l-ne)2V
60. If a composite bar of steel and copper is heated, then the copper bar will be under
Correct : B. compression
61. Effective length of a weld is equal to
Correct : C. overall length - 2 x weld size
62. Size of a right angled fillet weld is given by
Correct : B. 0.414 x throat thickness
63. The effective length of a fillet weld designed to transmit axial load shall not be less than
Correct : B. 4 x size of weld
64. Size of fillet weld with unequal legs is equal to
Correct : A. smaller leg length
65. Weakest section in a fillet weld is
Correct : A. throat of the fillet
66. Effective throat thickness of a fillet weld is
Correct : C. a function of the angle between fusion faces
67. According to Unwin's formula, the dia¬meter of rivet in mm to suit the t mm thickness of
plate is given by
Correct : B. 6Vt
68. A flat carrying a pull of 69C kN is con-nected to a gusset plate using rivets. If the pulls required to shear the rivet, to crush the rivet and to tear the plate per pitch length are 68.5 kN, 46 kN and 69 kN respectively, then the number of rivets required is
Correct : C. 15
69. If the rivet value is 16.8 kN and force in the member is 16.3 kN, then the number of rivets
required for the connection of the member to a gusset plate is
Correct : B. 2
70. At a point in a strained body carrying two unequal unlike principal stresses pi and p2 (Pi >
P2X the maximum shear stress is given by
Correct : D. (p, + p2)/2
71. If a point in a strained material is subjected to equal normal and tangential stresses, then the angle of obliquity is
Correct : B. 45°
72. If a prismatic member with area of cross-section A is subjected to a tensile load P, then the maximum shear stress and its inclination with the direction of load respectively are
Correct : B. P/2Aand45°
73. The sum of normal stresses is
Correct : A. constant
74. The radius of Mohr's circle for two equal unlike principal stresses of magnitude p is
Correct : A. p
75. Shear stress on principal planes is
Correct : A. zero
76. The state of pure shear stress is produced by
Correct : A. tension in one direction and equal compression in perpendicular direction
77. According to Rankine's hypothesis, the criterion of failure of a brittle material is
Correct : A. maximum principal stress
78. Maximum bending moment in a beam occurs where
Correct : D. shear force changes sign
79. Rate of change of bending moment is equal to
Correct : D. rate of loading
80. The diagram showing the variation of axial load along the span is called
Correct : A. shear force diagram
81. The difference in ordinate of the shear curve between any two sections is equal to the area under
Correct : D. load curve between these two sections plus concentrated loads applied between the sections
82. The variation of the bending moment in the portion of a beam carrying linearly varying load is
Correct : C. cubic
83. The maximum bending moment due to a moving load on a fixed ended beam occurs
Correct : A. at a support
84. A cantilever beam AB of length 1 carries a concentrated load W at its midspan C. If the free
end B is supported on a rigid prop, then there is a point of contraflexure
Correct : A. between A and C
85. A prismatic beam fixed at both ends carries a uniformly distributed load. The ratio of bending moment at the supports to the bending moment at mid-span is
Correct : D. 2.0
86. A beam of overall length 1 with equal overhangs on both sides carries a uniformly distributed load over the entire length. To have numerically equal bending moments at centre of the beam and at supports, the distance between the supports should be
Correct : C. 0.5861
87. A prismatic beam of length 1 and fixed at both ends carries a uniformly distributed load. The
distance of points of contraflexure from either end is
Correct : B. 0.2111
88. A simply supported beam of length 1 carries a load varying uniformly from zero at left end to maximum at right end. The maximum bending moment occurs at a distance of
Correct : A. 1/V3 from left end
89. A portion of a beam between two sections is said to be in pure bending when there is
Correct : A. constant bending moment and zero shear force
90. The ratio of width to depth of a strongest beam that can be cut out of a cylindrical log of
wood is
Correct : B. 1/V2
91. Of the several prismatic beams of equal lengths, the strongest in flexure is the one having
maximum
Correct : B. section modulus
92. Of the two prismatic beams of same material, length and flexural strength, one is circular and other is square in cross-section. The ratio of weights of circular and square beams is
Correct : A. 1.118
93. A flitched beam consists of a wooden joist 150 mm wide and 300 mm deep strengthened by steel plates 10 mm thick and 300 mm deep one on either side of the joist. If modulus of elasticity of steel is 20 times that of wood, then the width of equivalent wooden section will be
Correct : D. 550 mm
94. A beam of rectangular cross-section is 100 mm wide and 200 mm deep. If the section is subjected to a shear force of 20 kN, then the maximum shear stress in the section is
Correct : D. 1.5 N/mm2
95. A beam of square cross-section with side 100 mm is placed with one diagonal vertical. If the shear force acting on the section is 10 kN, the maximum shear stress is
Correct : B. 1.125 N/mm2
96. A prismatic bar when subjected to pure bending assumes the shape of
Correct : D. arc of a circle
97. A beam of triangular cross section is placed with its base horizontal. The maximum shear stress intensity in the section will be
Correct : C. above the neutral axis
98. A beam of uniform strength has at every cross-section same
Correct : B. bending stress
99. For no torsion, the plane of bending should
Correct : B. pass through shear centre of section
100. Two beams, one of circular cross-section and other of square cross-section, have equal areas
of cross-section. If subjected to bending