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UPSC Civil Service Exam Questions - Engineering

Q1:

A city supply of 15000 cubic metres of water per day is treated with a chlorine dosage of 0.5 ppm. For this purpose, the requirement of 25% bleaching powder per day would be

A 300 kg

B 75 kg

C 30 kg

D 7.5 kg

ANS:C - 30 kg

@Ubaithullah

BP required = cl2 dosge/ % Cl2 in BP.
0.5/25% = (0.5/25) * 100 = 2 mg/lit.

Total BP in kg = 15000 * 10 3 * 2 * 10^-6 = 30 kg.

And @Joysen.

It will be 10^-6. Because to convert mg to kg we need to multiply it with 10^-6.