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UPSC Civil Service Exam Questions

Q1: Which one of the following equations correctly gives the relationship between the specific graivity of soil grains (G) and the hydraulic gradient (i) to initiate 'quick' condition in a sand having a void ratio of 0.5 ?

A G = 0.5 i + 1

B G = i + 0.5

C G = 1.5 i + 1

D G = 1.5 i - 1

ANS:C - G = 1.5 i + 1

i = (G-1)/(1+e).
i = (G-1)/(1+0.5),
i = (G-1)/1.5,
1.5i = G-1,
1.5i + 1 = G.



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