Thermodynamics is an important topic in the Physics section in BITSAT exam. Practising this topic will increase your score overall and make your conceptual grip on BITSAT exam stronger.
This article gives you a full set of BITSAT PYQs for Thermodynamics with explanations for effective preparation. Practice of BITSAT Physics PYQs including Thermodynamics questions regularly will improve accuracy, speed, and confidence in the BITSAT 2026 exam.
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BITSAT PYQs for Thermodynamics with Solutions
1.
A source supplies heat to a system at the rate of 1000 W. If the system performs work at a rate of 200 W, what is the rate at which internal energy of the system increases?- 1200 W
- 600 W
- 500 W
- 800 W
2.
A thermodynamical system is changed from state $(P_1, V_1)$ to $(P_2, V_2)$ by two different processes, the quantity which will remain same will be- $\Delta Q$
- $\Delta W$
- $\Delta Q + \Delta W $
- $\Delta Q - \Delta W$
3.
A gas expands isothermally and reversibly from a volume V to 2V. If the initial pressure is P, what is the final pressure?- \( \frac{P}{2} \)
- \( \frac{P}{4} \)
- \( 2P \)
- \( P \)
4.
An ideal gas expands from 2 L to 6 L at a constant temperature of 300 K. Calculate the work done by the gas if pressure remains constant at 2 atm. (1 atm = $1.013 \times 10^5$ Pa)- 810.4
- 820
- 820.5
- 795.5
5.
For the reaction: \( \text{N}_2(g) + 3\text{H}_2(g) \rightarrow 2\text{NH}_3(g) \), the enthalpy change (\( \Delta H \)) is –92.4 kJ/mol. What type of reaction is it?- Endothermic
- Exothermic
- Isothermal
- Photochemical
6.
In an isobaric process, 200 J of heat is supplied to a gas. The gas does 50 J of work. What is the change in internal energy?- 150 J
- 250 J
- 100 J
- 200 J
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