Question

Identify the process that proceeds with no heat exchange between system and surrounding.

• A. Isothermal
• B. Isobaric
• C. Isochoric
• D. Adiabatic

Hint:

Zero heat exchange means q equals zero.

Answer 1

The Correct Option is D

Step 1: Think of the first law
Heat flow is $q$. For an insulated container or very fast change there is no heat transfer, so $q=0$. That is the definition of an adiabatic process.

Step 2: Other options
Isothermal needs heat flow to keep $T$ fixed. Isobaric and isochoric fix $P$ and $V$, not the heat.

Final Answer:
Adiabatic. \[ \boxed{\text{(D)}\ \text{Adiabatic}} \]