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UPSC Civil Service Exam Questions - Engineering

Q1:

In a direct shear test the shear stress and normal stress on a dry sand sample at failure are 0.6 kg/cm2 and 1 kg/cm2 respectively. The angle of internal friction of the sand will be nearly

A 25°

B 31°

C 37°

D 43°

ANS:B - 31°

We know that s=c+6Tan^.
For sandy soil c=0,
than, we findTan^.