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7th Class Science Heat Question Bank Heat

  • question_answer
    When you put a metal key into its metal lock, you find the key is too tight. Which of the following methods will you adopt to make the key fit properly?              

    A) Heating the key and lock both     

    B) Cooling the key and heating the lock

    C) Heating the key and cooling the lock

    D) Cooling the key and lock both     

    Correct Answer: B

    Solution :

    We have to cool the key and heat the lock since cooling causes contraction of key and heating causes expansion of the keyway of the lock.                             


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