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For polytropic process PV^n = constant, n = 0 means:

AIsochoric
BIsobaric
CIsothermal
DAdiabatic
Answer & Solution
Correct answer: B. Isobaric
n = 0: PV⁰ = P × 1 = P = constant. So pressure is constant — ISOBARIC. (n = 1 isothermal; n = γ adiabatic; n = ∞ isochoric.)
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