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UPSC Civil Service Exam Questions - Engineering

Q1:

The ratio of total elongation of a bar of uniform cross-section produced under its own weight to the elongation produced by an external load equal to the weight of the bar is

A 2

B 1

C 1/2

D 1/4

ANS:C - 1/2

Elongation due to self wt = PL/2AE,
Elongation due to external load = PL/AE,
Then ratio will be according to question = 1/2.