NEET 2022 Chemistry Work Work Done in Thermodynamic Processes MCQ Question

Chapter: Thermodynamics

Class: 11 | Topic: Work Done in $P$-$V$ Diagram | Difficulty: 🟡 Moderate

✅ Ans: D

Work done by a gas is:

$$W=\int P\,dV$$

Therefore, work done is represented by the area under the $P$-$V$ curve.

For the given curves:

• A ❌ — Volume remains constant, so $dV=0$:

  $$W=0$$

• B ❌ — The area under the curve is smaller.

• C ❌ — It is a closed cycle. The net work is only the area enclosed between the two curves.

• D ✅ — It has the largest area under the $P$-$V$ curve, hence maximum work.

📌 NCERT: The work done by a system is represented by the area under the $P$-$V$ curve.

🧠 NEET Trick:

$$\boxed{\text{Larger area under }P\text{-}V\text{ curve} \Rightarrow \text{larger work}}$$

So, Option D.