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    Select Question Language :

    Which of the following statements is true?

    Options :-

    1. Heat can be fully converted into work.
    2. Work can`t be fully converted into heat.
    3. The efficiency of heat engine increases as the temperature of the heat source is increased while keeping the temperature of the heat sink fixed.
    4. A cyclic process can be devised whose sole effect is to transfer heat from a lower temperature to a higher temperature.
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