Question

Which one of the following equations specifies an isobaric process? \([Q = \text{heat supplied}, \Delta P, \Delta V \text{ and } \Delta T \text{ are change in pressure, volume and temperature respectively}]\)

• A. \( Q = 0 \)
• B. \( \Delta T = 0 \)
• C. \( \Delta V = 0 \)
• D. \( \Delta P = 0 \)

Hint:

Prefixes: “iso” means same. “baric” refers to pressure (bar). So isobaric = same pressure.

Answer 1

The Correct Option is D

Step 1: Recall what isobaric means.
The word isobaric means the pressure is held constant during the process.

Step 2: Turn that into a condition.
Constant pressure means there is no change in pressure, so $\Delta P = 0$.

Step 3: Check the others.
$Q=0$ is adiabatic, $\Delta T = 0$ is isothermal, and $\Delta V = 0$ is isochoric, so none of these fit.

Step 4: State the answer.
\[ \boxed{\Delta P = 0} \]