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Which one of the following equations does not correctly represent the first law of thermodynamics for the given processes involving an ideal gas ? (Assume non-expansion work is zero) (1) Adiabatic process : ΔU = –w (2) Cyclic process : q = – w (3) Isothermal process : q = – w (4) Isochoric process : ΔU = q |
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Answer» Correct option (1) Adiabatic process : ΔU = –w Explanation: Ist law of thermodynamics ΔE = q + w 1. Adiabatic process q = 0, (ΔE = w) or (ΔU = w) 2. Cyclic process ΔE = 0, (q = – w) 3. Isothermal process ΔE = nCVΔT, (ΔT = 0) ΔE = 0, (q = –w) 4. Isochoric process ΔV = 0 w = PΔV = 0 ΔE = q |
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