Answer :

In an adiabatic process, we assume that there is no heat exchange between the system and surroundings.


Hence, Q = 0. Also, U = W(when Q = 0), so Q ≠ W holds.


Option (b) is incorrect because due to change in temperature, there is still a change in internal energy and from the first law of thermodynamics, ΔU = W. Hence W ≠ 0.


Option (c) is incorrect because the heat exchange is zero, but the work done in general is not zero.


Hence, the correct answers are option (a) and (d).

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