Civil Engineering MCQAE Level Civil Engineering
If chlorine demand of a water sample is 0.2 mg/l and the bleaching powder contains 30% chlorine, the amount of bleaching powder needed for 1 litre of water is:
Environmental EngineeringEnvironmental EngineeringMEDIUM
Choose the correct answer
A
0.14 mg
B
0.06 mg
C
0.133 mg
D
0.67 mg
Correct Answer
D. 0.67 mg
AI Detailed Explanation & IS Code Reference
Unlock the reasoning, formula path and code-linked notes inside your student dashboard.
Required bleaching powder = chlorine demand/available chlorine fraction = 0.2/0.30 = 0.67 mg
ScoreCardAI links this solution with subject, topic and difficulty signals so your scorecard can identify weak areas after a full mock test.
Concept shortcut
IS/IRC reference
Common trap
Practice more Civil Engineering questions
This MCQ belongs to WBPSC AE Previous Years Questions Series. Full tests include timed attempts, rank comparison and subject-wise analysis.