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

  • question_answer
                    The following figure represents the different zones of a flame.
    The information in which alternative correctly represents the different zones of the flame?

    A)
    i ii iii
    Zone of complete combustion  Zone of partial combustion   Zone of unburnt wax vapours

    B)
    i ii iii
    Zone of partial combustion      Zone of unburnt wax vapours     Zone of complete combustion

    C)
    i ii iii
    Zone of unburnt   Wax  vapours Zone of partial combustion      Zone of complete combustion

    D)  
    i ii iii
    Zone of complete combustion Zone of partial combustion      Zone of unburnt   Wax  vapours

    Correct Answer: C

    Solution :

      The candle flame consists of outermost zone, middle zone, and innermost zone. The outermost zone is the zone of complete combustion. It is blue in colour and is the hottest part of the flame. In the middle zone, partial combustion takes place. It appears yellow in colour. This zone is moderately hot. The innermost zone is the zone of unburnt wax. This zone appears black in colour. It is the least hot region of the flame. The correct answer is C.


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