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

Civil Engineering Mcqs

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

(A)  Carbondioxide gas

(B)  Hydrogen sulphide gas

(C)  Methane gas

(D)  Petrol vapours

Submitted By :Ali Uppal

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