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

  • question_answer
    In refrigerators, the liquid used as refrigerant is

    A)  Liquid nitrogen

    B)         Liquid carbon dioxide

    C)  Liquid ammonia 

    D)           Super-cooled water

    Correct Answer: C

    Solution :

    [c] A refrigerant is a substance or mixture, usually a fluid, used in a heat pump and refrigeration cycle. In most cycles it undergoes phase transitions from a liquid to a gas and back again. Many working fluids have been used for such purposes. Fluorocarbons, especially chlorofluorocarbons, became commonplace in the 20th century, but they are being phased out because of their ozone depletion effects. Other common refrigerants used in various applications are ammonia, sulfur    dioxide,    and    non- halogenated hydrocarbons such as propane.

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