Thermodynamics JEE Mains Questions With Solutions, PDF Link

Thermodynamics JEE Mains Questions are an important part of the Physics syllabus for competitive exams like JEE, which are high scoring. This topic covers fundamental concepts such as the first law of thermodynamics, thermodynamic processes including isothermal, adiabatic, isobaric, isochoric, heat engines, and efficiency. 

Regularly solving Thermodynamics JEE Mains Questions helps students apply key formulas like ΔU=Q−W. Also, it helps them to understand their practical application in numerical problems. Students can expect both conceptual and numerical queries based on this topic in the JEE paper. Dedicated practice with these questions can improve the confidence of students. It also provides them with the clarity to tackle complex physics problems. For the upcoming cycle, focusing on Thermodynamics JEE Mains Questions 2025 is important to understand the most recent exam trends and patterns.

Thermodynamics JEE Mains Questions Overview

Thermodynamics JEE Mains Questions are a mix of theoretical understanding, solving numerical problems, and reasoning based on concepts. These questions test the knowledge of energy transfer, work done by a system, and the properties of different thermodynamic processes. They need a clear understanding of the difference between an isothermal and an adiabatic process, and how these are represented on P-V diagrams. Solving the latest Thermodynamics JEE Mains Questions and Answers can provide aspirants with the essential practice needed to improve their conceptual base and calculation speed. 

Thermodynamics JEE Mains Questions PDF Link

Thermodynamics JEE Mains Questions PDF is an important resource for students who are aiming for practice and revision that is productive. It includes multiple-choice questions and solved numerical problems based on topics. This facilitates a structured and systematic study. Having the PDF allows candidates to study and practise offline, without dependency on the internet. This concentrated practice is key to building speed and accuracy. Here is the PDF Download Link:

Thermodynamics JEE Mains Questions PDF Link 

How Thermodynamics JEE Mains Questions with Solutions Help Students?

Thermodynamics JEE Mains Questions With Solutions are very beneficial, as they offer detailed explanations and step-by-step breakdowns of the answers. By reviewing the solutions, students can understand the reasoning, the correct formula selection, and the calculation sequence used to arrive at the final answer. Students are advised to analyse the solutions completely to enhance their conceptual understanding of complex topics. Regular practice helps aspirants build accuracy and speed, especially for numerical problems. Numerical problems are often a core part of Thermodynamics JEE Questions.

• Students can increase their understanding of basic concepts in Thermodynamics by reviewing solutions with care.

• Students are advised to enhance logical skills to solve problems through reasoning.

• Students can follow the sequence of calculations to enhance their accuracy in numerical problems.

• Students are advised to maintain a regular practice schedule to improve their efficiency during exams.

• Students should use these solutions to track progress and identify areas that require further revision.

Importance and Weightage of Thermodynamics JEE Mains Questions

Thermodynamics JEE Mains Questions form an important segment of the Physics section. The questions test both direct formula application and conceptual reasoning related to energy and processes. Focusing on Thermodynamics JEE Questions helps students prepare for expected question patterns and improve accuracy. From here, students can understand the importance of Thermodynamics JEE Mains Questions:

Note: The weightage of the Thermodynamics questions mentioned above is for reference purposes only. Candidates can check the official examination portal to learn about the latest trends in questions.

Example Thermodynamics JEE Mains Questions

Here are a few examples of Thermodynamics JEE Mains Questions from previous years to help you understand the type of questions asked:

Q1 An electric appliance supplies 6000 J/min heat to the system. If the system delivers a power of 90 W. How long it would take to increase the internal energy by 2.5×103 J?

(A) 4.1×101 s

(B) 2.4×103 s

(C) 2.5×101 s

(D) 2.5×102 s

Q2 The P-V diagram of a diatomic ideal gas system going under cyclic process as shown in figure. The work done during an adiabatic process CD is (use γ=1.4).

(A) -500 J

(B) 400 J

(C) -400 J

(D) 200 J

Q3 In the reported figure, there is a cyclic process ABCDA on a sample of 1 mol of a diatomic gas. The temperature of the gas during the process A → B and C → D are T1​ and T2​ (T1​>T2​) respectively. Choose the correct option out of the following for work done if processes BC and DA are adiabatic.

(A) WAB​=WDC​

(B) WAD​=WBC​

(C) WAB​<WCD​

(D) (WBC​+WDA​)>0

Q4 A diatomic gas, having CP​=27​R and CV​=25​R is heated at constant pressure. The ratio dU:dQ:dW:

(A) 5:7:2

(B) 3:5:2

(C) 5:7:3

(D) 3:7:2

Q5 An ideal gas in a cylinder is separated by a piston in such a way that the entropy of one part is S1​ and that of the other part is S2​. Given that S1​>S2​. If the piston is removed then the total entropy of the system will be:

(A) S1​−S2​

(B) S2​S1​​

(C) S1​×S2​

(D) S1​+S2​

Q 6 Two Carnot engines A and B operate in series such that engine A absorbs heat at T1​ and rejects heat to a sink at temperature T. Engine B absorbs half of the heat rejected by Engine A and rejects heat to the sink at T3​. When work done in both the cases is equal, the value of T is:

(A) 23​T1​+31​T3​

(B) 32​T1​+23​T3​

(C) 32​T1​+31​T3​

(D) 31​T1​+32​T3​

Q 7 The amount of heat needed to raise the temperature of 4 moles of a rigid diatomic gas from 0∘C to 50∘C when no work is done is. (R is the universal gas constant)

(A) 175 R

(B) 750 R

(C) 250 R

(D) 500 R

Q 8 One mole of an ideal gas is taken through an adiabatic process where the temperature rises from 27∘C to 37∘C. If the ideal gas is composed of polyatomic molecule that has 4 vibrational modes which of the following is true?

(A) Work done on the gas is close to 582 J

(B) Work done by the gas is close to 332 J

(C) Work done by the gas is close to 582 J

(D) Work done on the gas is close to 332 J

Q 9 7 mol of a certain monoatomic ideal gas undergoes a temperature increase of 40 K at constant pressure. The increase in the internal energy of the gas in this process is: (Given R=8.3JK−1mol−1)

(A) 5810 J

(B) 3486 J

(C) 11620 J

(D) 6972 J

Q 10 The pressure P1​ and density d1​ of diatomic gas (γ=57​) changes suddenly to P2​(>P1​) and d2​ respectively during an adiabatic process. The temperature of the gas increases and becomes x1​ times of its initial temperature. (given d1​d2​​=32)

(A) 41​

(B) 31​

(C) 21​

(D) 61​

Q 11 Let η1​ is the efficiency of an engine at T1​=447∘C and T2​=147∘C while η2​ is the efficiency at T1​=947∘C and T2​=47∘C. The ratio η2​η1​​ will be

(A) 0.41

(B) 0.56

(C) 0.73

(D) 0.70

Q 12 A Carnot engine takes 5000 kcal of heat from a reservoir at 727∘C and gives heat to a sink at 127∘C. The work done by the engine is

(A) 3×106J

(B) Zero

(C) 12.6×106J

(D) 8.4×106J

Q 13 A cylinder of fixed capacity of 44.8 litres contains helium gas at standard temperature and pressure. The amount of heat needed to raise the temperature of gas in the cylinder by 20.0∘C will be: (Given gas constant R=8.3JK−1mol−1)

(A) 249 J

(B) 415 J

(C) 498 J

(D) 830 J

Q 14 A carnot engine whose heat sinks at 27∘C has an efficiency of 25%. By how many degrees should the temperature of the source be changed to increase the efficiency by 100% of the original efficiency?

(A) Increases by 18∘C

(B) Increases by 200∘C

(C) Increases by 120∘C

(D) Increases by 73∘C

Q 15 Heat energy of 735 J is given to a diatomic gas allowing the gas to expand at constant pressure. Each gas molecule rotates around an internal axis but do not oscillate. The increase in the internal energy of the gas will be:

(A) 525 J

(B) 441 J

(C) 572 J

(D) 735 J

Q 16  A heat engine operates between a cold reservoir at temperature T2​=400K and a hot reservoir at temperature T1​. It takes 300 J of heat from the hot reservoir and delivers 240 J of heat to the cold reservoir in a cycle. The minimum temperature of the hot reservoir has to be ........... K.

Q 17 300 cal of heat is given to a heat engine and it rejects 225 cal of heat. If source temperature is 227∘C, then the temperature of sink will be ........... ∘C.