NEET 2010 Physics question

If and represent the increase in internal energy and work done by the system respectively in a thermodynamical process, which of the following is true?

(1), in a adiabatic processCorrect
(2), in a isothermal process
(3), in a adiabatic process
(4), in a isothermal process

Answer: (1)

Solution

First law of thermodynamics: , where is the work done BY the system. Adiabatic process: no heat exchange, , so . This is option (1) (the internal energy falls by the amount of work done by the gas). Isothermal

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Question ID VK-090490