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UPSC Civil Service Exam Questions - Engineering

Q1:

Approximate ratio of the permeabilities of two clean soils having D10 = 0.6 mm and D10 = 0.3 mm is

A 4.0

B 3.75

C 4.25

D 3.5

ANS:A - 4.0

K=100*D10.

=100*.6*.6=36,
K=100*.3*.3=9,
36/9=4.