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UPSC Civil Service Exam Questions - Engineering

Q1:

Two similar round bars A and B are each 30 cm long as shown in the given figure. The ratio of the energies stored by the bars A and B, is

A 3/2

B 1.0

C 5/8

D 2/3

ANS:A - 3/2

Here U~V ( strain energy is proportional to volume).
V = v1 + VW.
Va = 282.73cm^3.
Vb = 188.49cm^3.
Therefore Ub/Ua = 0.67(2/3).