- Amal Augustine
- January 7, 2026
Boost Your Score Fast: Ultimate Thermodynamic Processes MCQs for NEET,JEE & CUET
Thermodynamics is one of the most concept-driven and frequently tested areas of physics, especially in competitive examinations such as NEET, JEE Main, JEE Advanced, and state board exams. Among its many components, thermodynamic processes MCQs form a crucial subset that evaluates a student’s understanding of how heat, work, and internal energy interact under different physical constraints.
Thermodynamic processes mcqs describe the manner in which a system changes from one state to another. These changes may occur at constant temperature (isothermal), constant volume (isochoric), constant pressure (isobaric), or without heat exchange (adiabatic). Each process follows specific physical laws and mathematical relations, making them ideal candidates for multiple-choice questions that test both conceptual clarity and analytical reasoning.
Most thermodynamic processes MCQs revolve around identifying which physical quantity remains constant, how internal energy behaves, and how heat and work are distributed during a process. For instance, understanding that internal energy remains unchanged during an isothermal process for an ideal gas, or that no heat exchange occurs during an adiabatic process, is essential for quickly eliminating incorrect options in exams.
These thermodynamic processes MCQs also test deeper ideas such as entropy change, reversibility, cyclic processes, and real-world applications like petrol engines, sound propagation in air, and atmospheric heating. Rather than relying on rote memorization, students must visualize pressure-volume (PV) diagrams, interpret physical meaning, and apply the First and Second Laws of Thermodynamics correctly.
Practicing thermodynamic processes MCQs not only improves exam scores but also builds a strong conceptual foundation that supports advanced topics like heat engines, refrigerators, and entropy-based analysis.
30 Thermodynamic Processes MCQs-
1. During an isothermal expansion of an ideal gas:
A. Its internal energy decreases
B. Its internal energy does not change
C. The work done by the gas is equal to the quantity of heat absorbed by it
D. Both (B) and (C) are correct
Answer: D
2. Which of the following is NOT true about thermodynamic processes?
A. For isothermal process, dT = 0
B. For isochoric process, dP = 0
C. For isobaric process, dP = 0
D. For adiabatic process, dQ = 0
Answer: C
3. Which equation is valid for an adiabatic process?
A. TVγ=constantTV^\gamma = \text{constant}
B. pVγ=constantpV^\gamma = \text{constant}
C. TγVγ−1=constantT^\gamma V^{\gamma-1} = \text{constant}
D. T−1=constantT^{-1} = \text{constant}
Answer: A
4. Internal energy of a gas remains unchanged in which processes?
I. Isothermal
II. Adiabatic
III. Reversible
IV. Cyclic
A. I and IV
B. I, III and IV
C. III and IV
D. II and III
Answer: A
5. Which of the following is NOT a thermodynamic coordinate?
A. Gas constant (R)
B. Pressure (P)
C. Volume (V)
D. Temperature (T)
Answer: A
6. Heat supplied to an ideal gas under isothermal conditions results in:
A. Increase in internal energy
B. External work and temperature change
C. Rise in temperature
D. External work done by the system
Answer: D
7. Which ideal-gas process involves no heat transfer?
A. Isochoric
B. Isothermal
C. Isobaric
D. Adiabatic
Answer: D
8. Sound propagation in air is an example of:
A. Isothermal process
B. Adiabatic process
C. Isobaric process
D. Isochoric process
Answer: B
9. The work done by a gas is maximum when it expands:
A. Isothermally
B. Adiabatically
C. Isochorically
D. Isobarically
Answer: D
10. When water freezes to form ice cubes, entropy of water:
A. Does not change
B. Increases
C. Decreases
D. May increase or decrease
Answer: C
11. During isothermal expansion, internal energy of a gas:
A. Decreases
B. Increases
C. Becomes zero
D. Remains same
Answer: D
12. In an adiabatic process, which quantity remains constant?
A. Total heat of system
B. Temperature
C. Volume
D. Pressure
Answer: A
13. During adiabatic expansion, internal energy decreases by 2 J. Work done on gas is:
A. –2 J
B. 0 J
C. 3 J
D. 2 J
Answer: A
14. Internal energy remains constant in which process?
A. Adiabatic
B. Isochoric
C. Isobaric
D. Isothermal
Answer: D
15. Which statement is true?
A. Internal energy depends only on state
B. ΔU is maximum in isothermal process
C. Area under PV curve equals heat in all processes
D. Work is state dependent
Answer: A
16. Petrol engine does useful work during:
A. Suction stroke
B. Exhaust stroke
C. Adiabatic expansion
D. Combustion
Answer: C
17. Standard molar enthalpy of formation refers to:
A. Vaporization
B. Fusion
C. Vaporization (standard)
D. Formation from elements
Answer: D
18. For an ideal gas, internal energy:
A. Decreases in isothermal process
B. Decreases in isobaric process
C. Remains constant in isothermal process
D. Increases in isobaric process
Answer: B
19. Fraction of heat used to increase internal energy at constant pressure (monoatomic gas):
A. 3/8
B. 3/5
C. 3/4
D. 2/5
Answer: B
20. Which statement is correct?
A. Second law restricts some first-law-allowed processes
B. Spontaneous processes are reversible
C. No heat exchange in isothermal process
D. Environment differs greatly in quasi-static process
Answer: A
21. Which is NOT a reversible process?
A. Melting of ice
B. Heat conduction
C. Isothermal expansion
D. Adiabatic expansion
Answer: B
22. Psychrometer measures:
A. Relative humidity
B. Pressure
C. Temperature
D. Density
Answer: A
23. Internal energy remains unaffected in:
A. Isobaric
B. Adiabatic
C. Isochoric
D. Isothermal
Answer: D
24. Heating water at atmospheric pressure is a(n):
A. Isothermal process
B. Isobaric process
C. Adiabatic process
D. Isochoric process
Answer: B
25. A thermodynamic state is fully described by:
A. P, V, U
B. P, V, T
C. P, V, T, U
D. P and T
Answer: C
26. Which statement is NOT true?
A. Adiabatic system is insulated
B. Isochoric process has constant pressure
C. Isothermal process has constant temperature
D. Adiabatic: PVᵞ = constant
Answer: B
27. The PV diagram shown corresponds to which process?
A. Adiabatic
B. Isochoric
C. Isobaric
D. Isothermal
Answer: C
28. When water is heated from 0°C to 10°C, volume:
A. Decreases continuously
B. First decreases then increases
C. First increases then decreases
D. Increases continuously
Answer: B
29. When water is heated from 0°C to 20°C, volume:
A. Increases
B. Decreases
C. First increases then decreases
D. First decreases then increases
Answer: D
30. Which process involves no heat exchange but temperature change?
A. Isothermal
B. Isochoric
C. Isobaric
D. Adiabatic
Answer: D
Conclusion on Thermodynamic Processes MCQs
In conclusion, thermodynamic processes MCQs play a vital role in mastering the core ideas of thermodynamics. These thermodynamic processes mcqs questions demand more than formula recall—they require a clear understanding of physical principles, logical reasoning, and the ability to connect theory with real-world phenomena. By systematically practicing thermodynamic processes MCQs on isothermal, adiabatic, isochoric, and isobaric processes, students develop confidence in handling even tricky, concept-based questions under exam pressure.
A strong grasp of thermodynamic processes mcqs allows learners to quickly recognize which quantities remain constant, how internal energy responds to heat and work, and why certain processes are reversible while others are not. This thermodynamic processes mcqs conceptual strength significantly reduces common mistakes related to sign conventions, energy balance, and process identification.
Ultimately, consistent exposure to well-designed thermodynamic processes MCQs transforms thermodynamics from a challenging chapter into a scoring opportunity. With clarity, practice, and conceptual alignment, students can approach exams with assurance and apply thermodynamic principles accurately across a wide range of physics problems.
Amal Augustine is the founder of ExQuizMe, a dynamic learning and quiz platform built to make education engaging, competitive, and fun. A passionate learner and an academic achiever, Amal completed his schooling at Government HSS Manjapra, graduating with 92.5% in Computer Science. He later earned his degree from St. Stephen’s College, University of Delhi, one of India’s most prestigious arts and science institutions.
Currently, Amal is pursuing his Master’s degree at National Sun Yat-sen University, Taiwan, where he continues to deepen his interest in research and technology. Throughout his school and college years, he won 50+ national-level interschool and collegiate quiz competitions, was
Beyond academics, Amal Augustine is an avid reader of science journals, a dedicated research student, and a technology enthusiast who loves programming and exploring the world of Computer Science. Through ExQuizMe, he aims to make learning accessible, enjoyable, and empowering for students across the globe.