AIIMS 2019 Physics Adiabatic Processes Assertion Reason Question
Assertion : In adiabatic process work is independent of path.
Reason : In adiabatic process work done is equal to negative of change in internal energy.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Correct Answer
Detailed Explanation
In an adiabatic process, there is no heat exchange (Q = 0), and the work done (W) is indeed equal to the negative change in internal energy (ΔU), leading to the relationship W = -ΔU. However, the assertion that "work is independent of path" is misleading; while the work done in an adiabatic process can be calculated using the internal energy change, it is still path-dependent in general thermodynamic terms. Therefore, option D is correct as it indicates that the assertion and reason are not both true in the context provided. Options A and B misinterpret the relationship by not addressing the path dependency of work in thermodynamic processes.
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