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7th Class Science Heat Question Bank Heat

  • question_answer
    DIRECTIONS: On the basis of following diagram/picture answer the questions given below: Four metal cans are identical except for the color and texture of their outer surfaces. \[100\text{ }c{{m}^{3}}\] of water at \[70{}^\circ C\] is poured into each can. Which can cools most rapidly?

    A) A                     

    B) B

    C) C                                

    D) D

    Correct Answer: A

    Solution :

    Black, rough surfaces are good emitters of radiation, thus more heat will be lost by radiation, and will cool the fastest.


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