Download Aptitude Crack
img not found img not found

UPSC Civil Service Exam Questions - Engineering

Q1:

A 4-hour rainfall in a catchment of 250 km2 produces rainfall depths of 6.2 cm and 5.0 cm in successive 2-hour unit periods. Assuming the φ index of the soil to be 1.2 cm/hour, the run-off volume in ha-m will be

A 16

B 22

C 1600

D 2200

ANS:C - 1600

Runoff depth = (6.2-1.2x2) + (5-1.2x2).

= 3.8 + 2.6 = 6.4 cm.

Runoff volume = 6.4x10^-2x250x10^6x10^-4 ha-m.

= 1600 ha-m.