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    Question

    Which of the following statement(s) is/are true?

    I. Air expands on heating II. The warm air is heavier than the cold air
    A Neither I nor II Correct Answer Incorrect Answer
    B Both I and II Correct Answer Incorrect Answer
    C Only I Correct Answer Incorrect Answer
    D Only II Correct Answer Incorrect Answer

    Solution

    Warm air is lighter than the cold air. When air gets heated up it expands, occupies a larger volume and becomes less dense than the air surrounding it. Hence, the warm air rises and the cold air descends.

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