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UPSC Civil Service Exam Questions - Engineering

Q1:

Undrained strength of a clay soil can be obtained by conducting which of the following tests ?
1. UC test
2. Vane sheer test
3. Cyclic triaxial test
4. Slow direct sheer test
Select the correct answer using the code given below :

A 1 and 2 only

B 2 only

C 1 and 4

D 1, 2 and 3

ANS:D - 1, 2 and 3

The direct shear test is only for cohesionless soil ie. Sand. So, definitely Option D will not be A answer. I think option A is correct.