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UPSC Civil Service Exam Questions

Q1:
A gradually applied load W is suspended by with ropes AB and CD as shown in the figure. The wires AB and CD, made of the same material and of the same cross-section are connected to a rigid block from which the load W is suspended in such a way that both the ropes stretch by the same amount. If the stress in AB and CD are p1 and p2 respectively, then the ratio - will be

A

B

C

D

ANS:A -

πL1=FL/AY
Now according to question πL1=πL2 ,Y1=Y2, A1=A2
hence p1L1=p2L2.

P1/p2=L2/L1=6/4=3/2.



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