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8th Class Science Combustion and Flame Question Bank Combustion and Flame HOTS Objective Problems

  • question_answer
    If a goldsmith wants to make jewellery of gold and silver, then he has to melt them. To do this, he will use the ___i____ zone of the flame as this zone is the ____ii____ zone of the flame. The information in which alternative completes the given statement?

    A)  i-Innermost, ii-Hottest

    B)  i-Innermost, ii-Moderately hot

    C)  i-Outermost, ii-Moderately hot

    D)  i-Outermost, ii-Hottest

    Correct Answer: D

    Solution :

      The flame of a candle contains three different zones: outermost zone, middle zone, and innermost zone. The outermost zone of the flame is the hottest part of the flame, and the innermost zone of the flame is the least hot part. The middle zone is moderately hot. As gold and silver melts at a very high temperature, a goldsmith has to blow the outermost zone, which is the hottest part of the flame, to melt gold and silver. The correct answer is D.


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