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UPSC Civil Service Exam Questions - Engineering

Q1:

If all the dimensions of a prismatic bar of square cross-section suspended freely from the ceiling of a roof are doubled then the total elongation produced by its own weight will increase

A eight times

B four times

C three times

D two times

ANS:B - four times

Here, it's talking about keeping self-weight same so if we increase cross-section the weight will automatically increase. So here to keep weight same we use specific weight instead of its own weight.