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4th Class Science Our Environment Question Bank Our Environment

  • question_answer
    Select the option that arranges the major gases w. air in air in descending order of their percentage.

    A)  Oxygen < Nitrogen < Carbon dioxide

    B)  Nitrogen < Oxygen < Carbon dioxide

    C)  Nitrogen > Oxygen > Carbon dioxide

    D)  Carbon dioxide > Nitrogen > Oxygen

    Correct Answer: C

    Solution :

    Air is a mixture of various gases. It contains 78% nitrogen, 21% oxygen and traces of water vapour, carbon dioxide, argon and various other components.


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