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  1.  

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

    Carbondioxide gas
    B.
    Hydrogen sulphide gas
    C.

    Methane gas
    D.

    Petrol vapours.

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    Workspace

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    Answer : Option C

    Explanation :

    No answer description available for this question.

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