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7th Class Science Heat Question Bank Heat

  • question_answer
    Which part of a thermos flask prevents loss of heat through radiation?

    A)  Vacuum

    B)         Cork stopper

    C)         Double glass walls

    D)         Shiny/silvery wall

    Correct Answer: D

    Solution :

    Though there is vacuum in the thermos flask, radiation can take place as it does not require a medium. The shiny, silvery wall   reflects the radiated heat and thus keeps the contents hot/cold,                    


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