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UPSC Civil Service Exam Questions - Engineering

Q1:

A cylindrical bar of 20 mm diameter and 1 m length is subjected to a tensile test. Its longitudinal strain is 4 times that of its lateral strain. If the modulus of elasticity is 2 x 105 N/mm2, then its modulus of rigidity will be

A 8 x 106 N/mm2

B 8 x 105 N/mm2

C 0.8 x lO4 N/mm2

D 0.8 x 105 N/mm2

ANS:D - 0.8 x 105 N/mm2

G=2*10^5/2*(1+(1/4))=0.8*10^5.