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7th Class Science Heat Question Bank Heat

  • question_answer
    On a cold day, it is hard to open the lid of a tight container. But when you gently heat the neck you can easily open the lid. Why?

    A) On heating glass expands and lid contracts

    B) Lid expands more than the neck and thus slides easily

    C) Neck becomes slippery on heating

    D) Lids of the bottles cannot bear the heat

    Correct Answer: B

    Solution :

    Lid expands more than the neck and thus slides easily


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