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Mechanical Engineering Objective Questions { Strength of Materials }

86. The deformation of a bar under its own weight compared to the deformation of same body subjected to a direct load equal to weight of the body is
D.Four times

87. The elongation of a freely hanging uniform steel rope, if its length is doubled will increase in the ratio of

88. Young's Modulus is defined as the ratio of
A.Longitudinal stress to longitudinal strain
B.Lateral strain to longitudinal strain
C.Lateral stress to longitudinal strain
D.Longitudinal stress to lateral strain

89. If a merial is loaded beyond yield point stress
A.It becomes elastic
B.It becomes ductile
C.Its resistance to fatigue increases
D.It loses its tendency to return to its original shape

90. If all the dimensions of a prismatic bar be increased in the ratio of k 1, then maximum stress produced in the bar due to its own weight will increase in the following ratio
A.K : 1
B.K2 : 1
C.K3 : 1
D.1 : k

91. Modulus of rigidity is defined as the ratio of
A.Linear stress to longitudinal strain
B.Stress to volumetric strain
C.Shear stress to shear strain
D.Stress to strain

92. A body is subjected to three mutually per-' pendicular stresses of equal intensity. The ratio of direct stress to corresponding volumetric strain is called
A.Poisson's ratio
B.Bulk modulus
C.Modulus of rigidity
D.Young's modulus

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