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UPSC Civil Service Exam Questions - Engineering

Q1:

A clay layer, 5 m thick undergoes 50% consolidation in 5 years when subjected to an average pressure increase of 50 kN/m2. If the clay layer were 10 m thick, in what period would it undergo 50% consolidation for the same pressure ?

A 10 years

B 2.5 years

C 25 years

D 20 years

ANS:D - 20 years

RELATION.

T = Ct/d^2
t is proportional to d^2.
so,
t2=t1(d2/d1)^2.
t2= 5(10/5)^2.
t2=5x4=20 years.