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UPSC Civil Service Exam Questions - Engineering

Q1:

If the proportion of soil passing 75 micron sieve is 50% and the liquid limit and plastic limit are 40% and 20% respectively, then the group index of the soil is

A 3.8

B 6.5

C 38

D 65

ANS:B - 6.5

0.2(50-35)+0.005(50-35)(40-40)+0.01(50-15)(20-10).
Answer = 6.5.