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UPSC Civil Service Exam Questions - Engineering

Q1:

A soil deposit has three layers having same thickness each but the permeabilities of the layers are in the ratio of 1 : 2 : 4 from top to bottom. What is the ratio of average permeability in the horizontal direction to that in the vertical direction ?

A 7 : 2

B 14 : 6

C 28 : 24

D 49 : 36

ANS:D - 49 : 36

KH = 1+2+3/3 = 7/3.
KV = 3/1/1+1/2+1/4 = 3/1.75,
KH/KV= 2.3/1.71.