7th Class Science Heat Question Bank Heat

  • question_answer
    DIRECTIONS: On the basis of following diagram/picture answer the questions given below: The diagram shows a vacuum flask and an enlarged view of a section through the flask wall. The main reason for the silvering is to reduce heat transfer by

    A) conduction only

    B) conduction and convection

    C) radiation only

    D) radiation and convection

    Correct Answer: C

    Solution :

    The silvering reduces heat transfer by radiation as shiny (silvered) surfaces are poor emitters and poor absorbers of radiation.


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