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UPSC Civil Service Exam Questions - Engineering

Q1:

Active earth pressure per metre length on the retaining wall with a smooth vertical back as shown in the given figure will be

A 81 t

B 27 t

C 2 t

D 1 t

ANS:B - 27 t

Pa = 1/2*ka*r*H^2.
Ka = 1-sin30/1+sin30.

So, ka = 0.33.
We take ka=1/3.

Now apply formula,=1/2*1/3*2*9*9.
= 27 tonne.