If the flame of a miner’s safety lamp in a manhole extinguishes within 5 minutes, the sewer certainly contains_______________? | MCQ Hive

Civil Engineering MCQs

Q If the flame of a miner’s safety lamp in a manhole extinguishes within 5 minutes, the sewer certainly contains_______________?

A A. Hydrogen sulphide
B B. Carbon dioxide
C C. Methane
D D. Oxygen

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