SSC General Science & Technology Sample Paper NCERT Sample Paper-2

  • question_answer
    By which of the following methods could a cup of hot coffee lose heat if placed on a metal table in a room?

    A)  Convection and radiation

    B)  Conduction and radiation

    C)  Conduction and convection

    D)  Conduction, convection and radiation

    Correct Answer: D

    Solution :

    [d] Part of the heat is conducted away by the metal table. Convection currents in air near the surface of the coffee are set up which accounts for some heat loss. Heat is also lost by radiation from the hot coffee to the surroundings. Most of the heat is lost by the last method.

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