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UPSC Civil Service Exam Questions - Engineering

Q1:

A dry sand specimen is put through a triaxial test. The cell pressure is 50 kPa and the deviator stress at failure is 100 Pa. The angle of internal friction for the sand specimen is

A 15°

B 30°

C 37°

D 45°

ANS:B - 30°

Sin(fi) = sigma 1 -sigma 3/sigma 1+ sigma 3.

Where;
Sigma 1 = 100+50=150.
Sigma 3= 50.
Sinθ= 150-50/150+50.
Sinθ=1/2.

Then,
θ = 30°.