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UPSC Civil Service Exam Questions

Q1: Well-graded dense saturated sands have high shear strength because :

A Such sands have a better grade (superior type) of sand grains resulting in higher strength

B Such sands have lower water content, which increases shear strength

C Such sands have better interlocking of grains, higher inter-particle contacts and higher inter-particle frictional resistance resulting in higher strength.

D Presence of water in such sands induces capillary pressure generating higher inter-granular stresses, which generate apparent cohesion and hence higher shear strength.

ANS:C - Such sands have better interlocking of grains, higher inter-particle contacts and higher inter-particle frictional resistance resulting in higher strength.

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