In a thermodynamic system, Δ U represents the increases in its internal energy and dW is the work done by the system then correct statement out of the following is (a) Δ U = dW is an isothermal process (b) Δ U = -dW is an adiabatic process (c) Δ U = -dW is an isothermal process (d) Δ U = dW is an adiabatic process

Answer: (b). First law: dQ = Δ U + dW. Adiabatic: dQ = 0 ⇒ Δ U = -dW. Isothermal (ideal gas): Δ U = 0, so (a) and (c) fail. So the answer is (b).

In a thermodynamic system, Δ U represents the increases in its… | MHT CET 2023 (14 May, Shift 1)

Q133MHT CET 2023 · 14 MAY · SHIFT 1Easy

Thermodynamic Processes

In a thermodynamic system, $\Delta U$ represents the increases in its internal energy and dW is the work done by the system then correct statement out of the following is

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Answer: (b)

First law: $dQ = \Delta U + dW$ .
Adiabatic: $dQ = 0 \Rightarrow \Delta U = -dW$ .
Isothermal (ideal gas): $\Delta U = 0$ , so (a) and (c) fail.
So the answer is (b).

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