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

  • question_answer
    During summer; we feel comfortable under a fan because it:

    A)  Produces air which carries heat away from the body

    B)  Sets the air in motion, thereby increasing the evaporation of sweat

    C)  Produces convection currents

    D)  Throws cool air on us

    Correct Answer: B

    Solution :

    [b] Forced convection, as is effectuated by use of a fan or a blower, results in more efficient heat transfer than is possible by natural convection (which is the process in action in the absence of a fan).

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