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

  • question_answer
    Global warming is a result of ____i_____ percentage of ____ii_____ in air. The information in which alternative completes the given statement?

    A)  i-An increased, ii-Carbon dioxide

    B)  i-A decreased, ii-Carbon dioxide

    C)  i-An increased, ii-nitrogen

    D)  i-A decreased, ii-nitrogen

    Correct Answer: A

    Solution :

      Fuels, on combustion, release carbon dioxide\[(C{{O}_{2}})\]in the environment. As a large amount of fuel is burnt daily to meet our energy needs, the concentration of carbon dioxide in the atmosphere is increasing everyday. This increase in the concentration of carbon dioxide in the atmosphere causes a rise in the temperature of the Earth. This phenomenon is called global warming. The correct answer is A.


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