In which of the following processes is heat neither absorbed nor released by a system?
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In which of the following processes is heat neither absorbed nor released by a system?

G1 Physics · Accepted Answer

Step 1: An adiabatic process is defined by zero heat transfer across the system boundary: Q = 0. Step 2: Isobaric means constant pressure, isochoric means constant volume, and isothermal means constant temperature; none of these alone requires Q = 0. Step 3: Thus only an adiabatic process necessarily has no heat exchange. Final answer: (A) Adiabatic.