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UPSC Civil Service Exam Questions

Q1:

If the time required for 60% consolidation of a remoulded soil sample of clay with single drainage is t, then what is the time required to consolidate the same sample of clay with the same degree of consolidation but with double drainage ?

A 4 t

B 2 t

C t/2

D t/4

ANS:D - t/4

For the same degree of consolidation,

t1/t2=(d1/d2)^2

single drainage t1=t;d1=H

Double drainage t2=?; d2=h/2.
t2=t*((H/2)/H)^2=t/4.



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