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UPSC Civil Service Exam Questions - Engineering

Q1:

If in a concrete mix the fineness modulus of coarse aggregate is 7.6, the fineness modulus of fine aggregate is 2.8 and the economical value of the fineness modulus of combined aggregate is 6.4, then the proportion of fine aggregate is

A 25%

B
%

C 50%

D
%

ANS:A - 25%

Fine = (fm coarse - fm combined) / (fm coarse - fm fine) = 25%.