strength of materials mechanical engineering Mcqs
101. Hookes law holds good up to____________________?
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A. elastic limit

B. breaking point

C. yield point

D. limit of proportionality

E. plastic limit

102. Tensile strength of a material is obtained by dividing the maximum load during the test by the_________________?
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A. area at the time of fracture

B. average of A. and B.

C. original cross-sectional area

D. minimum area after fracture

E. none of the above.

103. It equal and opposite forces applied to a body tend to elongate it, the stress so produced is called______________________?
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A. internal resistanpe

B. tensile stress

C. compressive stress

D. transverse stress

E. working stress

104. If the radius of wire stretched by a load is doubled, then its Youngs modulus will be_______________?
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A. become four times

B. become one-fourth

C. remain unaffected

D. doubled

E. halved

105. In the lever of third order, load W, effort P and fulcrum F are oriented as follows_________________?
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A. P between W and F

B. W between P and F

C. F between W and P

D. W, P and F all on one side

E. none of the above

106. The ultimate tensile stress of mild steel compared to ultimate compressive stress is__________________?
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A. less

B. same

C. unpredictable

D. more or less depending on other factors

E. more
107. Modulus of rigidity is defined as the ratio of_________________?
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A. volumetric stress and volumetric strain

B. longitudinal stress and longitudinal strain

C. shear stress and shear strain

D. lateral stress and lateral strain

E. linear stress and lateral strain

108. The stress developed in a material at breaking point in extension is called__________?
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A. Breaking stress

B. Proof stress

C. Fracture stress

D. Yield point stress

109. A thin mild steel wire is loaded by adding loads in equal increments till it breaks. The extensions noted with increasing loads will behave as under_________________?
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A. first increase and then decrease

B. uniform throughout

C. increase uniformly first and then increase rapidly

D. increase rapidly first and then uniformly

E. increase uniformly

110. The unit of Youngs modulus is__________________?
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A. kg/cm

B. kg

C. kg cm2

D. kg/cm2

E. mm/mm