Thermodynamics JEE Advance Previous Year Questions with Solutions and Weightage

Thermodynamics is an important and frequently asked topic under Thermal Physics. It carries weightage of 6% and the candidates can expect 2-3 questions from these topics in the JEE Advanced exam.Last year, 3 questions were asked from these topics in the JEE Advanced exam 2024.

The most asked topics in heat and thermodynamics are the Laws of Thermodynamics, the Carnot Cycle, Heat Transfer, and the Kinetic theory of gases.

Must Read Articles:

• Download JEE Advanced Syllabus 2025
• Download JEE Advanced 2024 Paper With Detailed Solutions
• JEE Advanced Previous Year Question Paper PDF Download

Listed below is the list of thermodynamics questions with detailed solutions asked in JEE Advanced exam 2025:

Question 1:

PARAGRAPH "II" A cylindrical furnace has height (????) and diameter (????) both 1 m. It is maintained at temperature 360 K. The air gets heated inside the furnace at constant pressure ???????? and its temperature becomes ???? = 360 ????. The hot air with density ???? rises up a vertical chimney of diameter ???? = 0.1 m and height ℎ = 9 m above the furnace and exits the chimney (see the figure). As a result, atmospheric air of density ???????? = 1.2 kg m−3, pressure ???????? and temperature ???????? = 300 K enters the furnace. Assume air as an ideal gas, neglect the variations in ???? and ???? inside the chimney and the furnace. Also ignore the viscous effects. [Given: The acceleration due to gravity ???? = 10 m s−2 and ???? = 3.14] Considering the air flow to be streamline, the steady mass flow rate of air exiting the chimney is _______ gm s−1.

View Solution

Question 2:

A cylindrical furnace has height (????) and diameter (????) both 1 m. It is maintained at a temperature of 360 K. The air gets heated inside the furnace at constant pressure ???????? and its temperature becomes ???? = 360 ????. The hot air with density ???? rises up a vertical chimney of diameter ???? = 0.1 m and height ℎ = 9 m above the furnace and exits the chimney (see the figure). As a result, atmospheric air of density ???????? = 1.2 kg m−3, pressure ???????? and temperature ???????? = 300 K enter the furnace. Assume air as an ideal gas, neglecting the variations in ???? and ???? inside the chimney and the furnace. Also, ignore the viscous effects. [Given: The acceleration due to gravity ???? = 10 m s−2 and ???? = 3.14] Considering the airflow to be streamlined, the steady mass flow rate of air exiting the chimney is _______ gm s−1.

View Solution

Question 3:

One mole of an ideal gas undergoes two different cyclic processes I and I, as shown in the P-V diagrams below. In cycle, I processes a, b, c and d are isobaric, isothermal, isobaric, and isochoric, respectively. In cycle II, processes a',b',c', and d' are isothermal, isochoric, isobaric, and isochoric, respectively. The total work done during cycle I is ????I and that during cycle II is ????II. The ratio WI/WII is

View Solution

Question 4:

View Solution

Question 5:

View Solution

Question 6:

View Solution

Question 7:

An ideal gas is in thermodynamic equilibrium. The number of degrees of freedom of a molecule of the gas is ????. The internal energy of one mole of the gas is ???????? and the speed of sound in the gas is v????. At a fixed temperature and pressure, which of the following is the correct option?

View Solution

Question 8:

List I describes thermodynamic processes in four different systems List II gives the magnitudes (either exactly or as a close approximation) of possible changes in the internal energy of the system due to the process

Which one of the following options is correct?

View Solution

Question 9:

An ideal gas undergoes a four step cycle as shown in the P−V diagram below During this cycle, heat is absorbed by the gas in

• steps 1 and 2
• steps 1 and 3
• steps 1 and 4
• steps 2 and 4

View Solution

Question 10:

View Solution

Question 11:

As shown schematically in the figure, two vessels contain water solutions (at temperature (T ) of potassium permanganate (KMnO4) of different concentrations N1 and n2(n1>n2) molecules per unit volume with Δn=(n1−n2)<v of the molecules is limited by the viscous force −βv on each molecule, where β is a constant. Neglecting all terms of the order (Δn2), which of the following is/are correct?

View Solution

Question 12:

One mole of a monatomic ideal gas goes through a thermodynamic cycle, as shown in the volume versus temperature (V−T) diagram. The correct statement(s) is/are: [R is the gas constant]

View Solution

JEE Advanced 2025 Exam Pattern

The JEE Advanced 2025 exam consists of two papers: Paper 1 and Paper 2. Both papers are compulsory and must be attempted by the candidates. The exam will be conducted online (computer-based).

Subject-wise Syllabus: JEE Advanced 2025

The JEE Advanced 2025 Subject-wise Syllabus covers crucial topics across Physics, Chemistry, and Mathematics, with each subject focusing on advanced concepts.

• Mathematics emphasizes Calculus and Algebra (accounting for up to 40% of the exam)
• Physics delves into Mechanics and Electrodynamics, while Chemistry includes topics like Physical Chemistry and Organic Chemistry.
• As observed from past data that Mathematics often carries the highest weightage, making it a critical area for focused preparation.

JEE Advanced Chapter-wise Weightage

The JEE Advanced chapter-wise weightage helps you understand which topics carry more importance in the exam. By focusing on high-weightage chapters, you can optimize your preparation. For example, in Mathematics, topics like Calculus and Algebra usually carry about 50-60% of the questions, while in Physics, Mechanics and Electromagnetism contribute significantly.

JEE Advanced Physics - Weightage and Important Topics

• Mechanics (particularly Kinematics and Laws of Motion) have a higher weightage, often constituting a major chunk of the Physics paper.
• Modern Physics, with topics like the Photoelectric Effect and Nuclear Physics, remains significant with high-scoring potential.
• Physical Chemistry and Organic Chemistry both have a large weightage. Topics like Chemical Kinetics and Reaction Mechanisms in Organic Chemistry are crucial and frequently asked.
• Inorganic Chemistry remains a reliable scoring area with an emphasis on Periodic Table and Coordination Compounds.

JEE Advanced 2025: Subject-wise Weightage

• Mathematics holds the highest weightage, so mastering Calculus and Algebra is critical.
• Physics and Chemistry both have significant portions dedicated to Mechanics and Physical Chemistry, respectively.
• Regular practice of important topics like Modern Physics, Organic Chemistry, and Coordinate Geometry can help candidates maximize their scores in JEE Advanced 2025.

To find the Minimum Marks Required to Qualify JEE Advanced 2025, it's also important to understand the category-wise cutoff criteria set by the exam authorities.

Previous Years’ Question Paper

JEE Advanced 2024 Question Paper PDF

JEE Advanced 2023 Question Paper PDF

JEE Advanced 2022 Question Paper PDF

JEE Advanced 2021 Question Paper PDF

JEE Advanced 2020 Question Paper

Frequently Asked Questions:

Which thermodynamics topics are most frequently asked in JEE Advanced?

The topics which are frequently asked in JEE Advanced are first and the second law of thermodynamics, Carnot Cycle and Heat transfer. The laws of thermodynamics will be defined and mathematically expressed to offer a medium to measure changes in heat energy in a medium.

Does thermodynamics produce heat?

No, thermodynamics does not produce heat, it is the study of heat and energy and their transformation. There are certain proces in thermodynamics that inove heat generation or transfer like exothermic rection, heat transfer mechanisms, work heat conversions, and heat engine devices.

What is the most efficient way to revise thermodynamics in a short time?

The most efficient way to revise thermodynamics is as follows -

Make sure you have a solid understanding of basic concepts and laws of thermodynamics, such as the first and second laws, and the concepts of energy, heat, and work.

Step by step clear your concepts about the following topics:

1. Temperature

2. Heat

3. Internal energy

4. Work

5. Enthalpy

6. Entropy

7. Free energy

8. System

9. Thermodynamic processes like isothermal, isobaric. adiabatic.