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UPSC Civil Service Exam Questions - Engineering

Q1:

The shear modulus of a material is half of its Young's modulus. What is the value of its Poisson's ratio ?

A - 1

B - 0.5

C Zero

D 0.5

ANS:C - Zero

E = 2G(1+M).

Let E = 1 then G = 1/2,
1 = 2. 1/2 (1+M),
1 = 1+M,
M = 1-1 = 0.