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UPSC Civil Service Exam Questions - Engineering

Q1:

The head over a 90° V-notch weir increases from 0.15 m to 0.3 m. The ratio of new discharge to the original discharge is, nearly equal to

A 5.65

B 1.42

C 4.0

D 2.62

ANS:A - 5.65

Discharge through 90 deg. V-notch = 1380H^(2.5).

Ratio of new discharge to the original discharge = (0.3^2.5) / (0.15^2.5) = 5.65.