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UPSC Civil Service Exam Questions - Engineering

Q1:

For the compound bar shown in the below figure, the ratio of stresses in the portions AB : BC : CD will be

A 4 : 1 : 2

B 1 : 2 : 4

C 1 : 4 : 2

D 4 : 2 : 1

ANS:C - 1 : 4 : 2

Please give explanation.