UPSC Civil Service Exam Questions - Civil Engineering Questions and Answers

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

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

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

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

BOD is 20 ppm or mg/lit

Answer : Option C

Explanation :

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