Download Aptitude Crack
img not found img not found

UPSC Civil Service Exam Questions - Engineering

Q1:

Which one of the following related to domestic potable water quality is correct?

A Turbidity (on Silica scale) is 15-20 ppm or mg/lit.

B Colour (on Cobalt scale) is 15-25 ppm or mg/lit.

C Hardness (expressed as Ca CO3 equivalent) is 75-115 ppm or mg/lit

D BOD is 20 ppm or mg/lit

ANS:C - Hardness (expressed as Ca CO3 equivalent) is 75-115 ppm or mg/lit

Total hardness - 75-115mg/l.
Chloride - 250mg/l.
Fluorides - 0.5mg/l.
Nitrates - 45-100mg/l.
Magnesium - 30mg/l.
Iron - 0.3 mg/l.
Total diaolved solid - 450mg/l.
Turbidity - 5-10mg/l.
And pH -> 6.5-8.5.