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UPSC Civil Service Exam Questions - Engineering

Q1:

In a shape test of aggregate, which one of the following gives the correct slot for flakiness index of a material passing 50 mm sieve and retained on 40 mm sieve ?

A 25 mm

B 27 mm

C 81 mm

D 30 mm

ANS:B - 27 mm

50+40=90.
90÷2=45.
3/5*45=27mm.