UPSC Civil Service Exam Questions - Engineering

Q1:

A sewer is laid from a manhole A to a manhole B, 250 m apart along a downward gradient of 1 in 250. If the reduced level of the invert at A is 205.75 m and the height of the boring rod is 3 m, then, reduced level of the sight rail at B, is

A 202.75 m

B 206.75 m

C 208.75 m

D 211.75 m

ANS:B - 206.75 m

According to me, The right answer should be 207.75m.