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UPSC Civil Service Exam Questions - Engineering

Q1:

The area between the two isohytes 45 cm and 55 cm is 100 km2, and that between 55 cm and 65 cm is 150 km2. What is the average depth of annual precipitation over the basin of 250 km2 ?

A 50 cm

B 52 cm

C 56 cm

D 60 cm

ANS:C - 56 cm

P = A1(P1+P2 /2)+ A2(p2+p3/2) /(A1+A2).
= 100*(45+55/2)+ 150(55+65/2)/250,
= (5000+9000)/250.
= 14000/250 = 56.