strength of materials mechanical engineering MCQs – Page 4

Practise focused strength of materials mechanical engineering questions with marked answers for exam preparation and subject revision.

strength of materials mechanical engineering Mcqs

61. The stress necessary to initiate yielding is_________________?
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A. greater than that necessary to stop it

B. considerably lesser than that necessary to continue it

C. equal to that necessary to stop it

D. lesser than that necessary to stop it

E. considerably greater than that necessary to continue it

62. The co-efficient of friction depends upon _________________?
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A. nature of surfaces

B. ail of the above.

C. A. and B. above

D. area of contact

E. shape of the surfaces

63. The materials which exhibit the same elastic properties in all directions are called______________?
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A. isentropic

B. homogeneous

C. isotropic

D. inelastic

E. visco-elastic.

64. If rain is falling in the opposite direction of the movement of a pedestrain, he has to hold his umbrella ________________________?
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A. less inclined when standing

B. more inclined when moving

C. more inclined when standing

D. less inclined when moving

E. none of the above

65. A particle inside a hollow sphere of radius r, having coefficient of friction -rr can rest upto height of___________________?
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A. r/2

B. r/A

C. r/%

D. 0.134 r

E. 3r/8

66. A single force and a couple acting in the same plane upon a rigid body_________________?
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A. are equivalent

B. cannot balance each other

C. none of the above

D. balance each other

E. produce moment of a couple

67. A cylindrical section having no joint is known as ____________________?
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A. jointless section

B. seamless section

C. homogeneous section

D. manufactured section

E. perfect section

68. The value of Poissons ratio for steel is between_________________?
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A. 3 to 4

B. 0.25 to 0.33

C. 0.01 to 0.1

D. 0.4 to 0.6

E. 0.23 to 0.27

69. The algebraic sum of moments of the forces forming couple about any point in their plane is__________________?
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A. equal to the moment of the couple

B. constant

C. both of above are correct

D. both of above are wrong

E. none of the above

70. In a tensile test on mild steel specimen, the breaking stress as compared to ultimate tensile stress is_________________?
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A. same

B. less

C. more/less depending on composition

D. may have any value

E. more

71. The ratio of lateral strain to the linear strain within elastic limit is known as_______________?
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A. bulk modulus

B. modulus of elasticity

C. modulus of rigidity

D. Youngs modulus

E. Poissons ratio

72. During a tensile test on a specimen of 1 cm cross-section, maximum load observed was 8 tonnes and area of cross-section at neck was 0.5 cm2. Ultimate tensile strength of specimen is___________________?
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A. none of the above

B. 22 tonnes/cm2

C. 4 tonnes/cm2

D. 8 tonnes/cm2

E. 16 tonnes/cm2

73. If n = number of members andy = number of joints, then for a perfect frame, n =________________?
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A. 2/ -4

B. 2/-3

C. j-2

D. 3/-2

E. 2j-l

74. A beam is loaded as cantilever. If the load at the end is increased, the failure will occur ___________________?
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A. anywhere

B. in the middle

C. at the tip below the load

D. none of the above

E. at the support

75. In a belt drive, the pulley diameter is doubled, the belt tension and pulley width remaining same. The changes required in key will be____________________?
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A. increase key length

B. none of the above

C. increase key width

D. increase key depth

E. double all the dimensions

76. The C.G. of a plane lamina will not be at its geometrical centre in the case of a __________________?
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A. equilateral triangle

B. circle

C. rectangle

D. square

E. right angled triangle

77. Flow stress corresponds to___________________?
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A. rupture stress

B. breaking point

C. plastic deformation of solids

D. none of the above

E. fluids in motion

78. A flywheel on a motor goes from rest to 1000 rpm in 6 sec. The number of revolutions made is nearly equal to_________________?
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A. 250

B. 500

C. 25

D. 50

E. 100

79. In the tensile test, the phenomenon of slow extension of the material, i. e. stress increasing with the time at a constant load is called_____________?
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A. breaking

B. plasticity

C. yielding

D. creeping

E. none of the above

80. Coulomb friction is the friction between_____________________?
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A. two dry surfaces

B. solids and liquids

C. bodies having relative motion

D. two lubricated surfaces

E. electrically charged particles

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