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UPSC Civil Service Exam Questions - Engineering

Q1:

A steel cable of 2 cm diameter is used to lift a load of 500π kg. Given that, E = 2 x 106 kg/cm2 and the length of the cable is 10 m, the elongation of the cable due to the load will be

A 0.5 cm

B 0.25

C 1 cm

D 1/π cm

ANS:B - 0.25

Because elongation due to load, not by self-weight.

So, PL/AE.