Download Aptitude Crack
img not found img not found

UPSC Civil Service Exam Questions - Engineering

Q1:

A septic tank of 7 m3 in volume serves for 5 people. If the rate of accumulation of sludge is 70 litres per capita per year and sludge is removed when it occupies 50% of its volume, what is the cleaning interval of septic tank ?

A 3 years

B 5 years

C 7.5 years

D 10 years

ANS:D - 10 years

Volume/discharge = detention time.
Discharge = population * rate of accumulation of sludge = 70 * 5.

So, (0.5 * 7 * 1000)/(70 * 5) = 10 yr.