Internal energy of a gas increases when

The change is cyclic

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It absorbs heat

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The change is adiabatic

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None

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Solution

The correct option is C The change is adiabatic
An adiabatic process is one in which no heat is gained or lost by the system. The first law of thermodynamics with Q = 0 shows that all the change in internal energy is in the form of work done. Internal energy of a gas increases when the change is adiabatic.

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