A safety lamp when inserted in the upper portion of a manhole causes flames. It indicates the presence of Options: A . &nbspCarbondioxide gas B . &nbspHydrogen sulphide gas C . &nbspMethane gas D . &nbspPetrol vapours

A safety lamp when inserted in the upper portion of a manhole causes flames. It

Question

A safety lamp when inserted in the upper portion of a manhole causes flames. It indicates the presence of

Options:

A . Carbondioxide gas

B . Hydrogen sulphide gas

C . Methane gas

D . Petrol vapours

Answer: Option C

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