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UPSC Civil Service Exam Questions - Engineering

Q1:

Length of line measured with a 20 m chain was found to be 634.4 m. If the chain was 5 cm too long, throughout the measurement, then the true length of the line is

A 635.990 m

B 635.986 m

C 632.818 m

D 632.814 m

ANS:B - 635.986 m

Yeah, it must be C.
Here N.L = 20,
A.L = 20 + 0.5 = 20.5
C.L = 634.4,
M.L = (634.4/20.05)*20.