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6th Class Science The Living Organisms and their Surrounding Question Bank Our Environment

  • question_answer
    Three burning candles are covered with glass jars as shown in figures. Equal amount of air, \[C{{O}_{2}}\] and \[{{O}_{2}}\] are present in jars X, Y and Z, respectively. Arrange the candles in decreasing order of the time for which they will continue to burn.

    A) Z, X, Y            

    B)        X, Y, Z            

    C)        X, Z, Y            

    D)        Z, Y, X

    Correct Answer: A

    Solution :

    Oxygen is necessary for burning. Air also supports burning as it contains oxygen. It is a mixture of gases i.e. nitrogen, oxygen, noble gases, carbon dioxide and water vapour. Hence amount of oxygen present in jar Z is higher as compared to that present in jar X. Jar Z will therefore support burning of candle for a longer time than jar X. Carbon dioxide does not support burning and extinguishes fire.


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