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UPSC Civil Service Exam Questions - Engineering

Q1:

A bed of sand consists of three horizontal layers of equal thickness. The value of Darcy's k for the upper and lower layers is 1 x 10-2 cm/sec and that for the middle layer is 1 x 10-1 cm/sec. The ratio of the permeability of the bed in the horizontal direction to that in the vertical direction is

A 10.0 to 1

B 2.8 to 1

C 2.0 to 1

D 1 to 10

ANS:B - 2.8 to 1

K1*Z1+K2*Z2+K3*Z3/(Z1+Z2+Z3).
K1=1*10^-2,
K2=K3=1*10^-1.