NEET thermodynamics important questions comprehensive guide helps students to know the important questions that can come from the specific topic. Accordingly, students can prepare for the exam.
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Thermodynamics is a tough but important topic in Physics for NEET aspirants. Expertising the topic requires a clear understanding of fundamental concepts, laws and the ability to solve related questions efficiently.
In this article, we will cover important thermodynamics questions for NEET and provide strategies on how to prepare this topic effectively. This guide also offers strategies to practice the NEET previous year question paper to enhance the preparation.
Necessity of Understanding the Topics of Thermodynamics
As this chapter has a high weightage in NEET Physics, there is a probability that around 2-5 questions are asked every year. Securing high marks in this section can give students a high rank in NEET 2025, making it necessary to practice important questions thoroughly. This chapter includes the study of heat, energy, and work, along with the laws which govern these phenomena.
- Zeroth law of thermodynamics: Thermal equilibrium and its applications.
- 1st Law of Thermodynamics: Contains concepts of internal energy, heat, and work.
- 2nd Law of thermodynamics: Entropy, spontaneous processes, and heat engines.
- Carnot Theorem and Carnot Engine: Contains topics such as the efficiency of engines, refrigerators and reversible processes.
- Enthalpy, entropy, and free energy: These are used in predicting the spontaneity of reactions.
In addition, it also contains topics on adiabatic and isothermal processes, heat transfer methods, and specific heat capacities. The differences between reversible and irreversible processes, along with concepts like enthalpy, internal energy, and the ideal gas law, are important for solving complex NEET thermodynamics questions.
Also Read: Top 15 Most Repeated Questions in NEET Physics
Most Important Thermodynamics Questions for NEET 2025
The types of questions asked in previous NEET exams can help aspirants focus on their preparation effectively.
Below are some of the frequently-repeated and most- important-questions from the thermodynamics chapter:
1. First law of thermodynamics questions
The first law, also known as the law of energy conservation, forms the foundation of many NEET questions.
Question 1. A gas undergoes expansion from an initial volume of 2L to 5L against a constant external pressure of 2 atm. Calculate the work done, W by the gas.
Answer: The work done (W) can be calculated using the formula: W=-Pext ∆V
W=-2*(5-2)=-6L-atm
To convert L-atm to Joules (J), multiply by 101.3:
W=-6*101.3=-607.8J
Hence, the work done is -607.8 J.
2. Heat engine refrigerator and carnot cycle
Questions from this topic focus on the efficiency, heat engines and refrigerators
Question B. A Carnot engine operates between temperatures of 500 K and 300 K. Find its efficiency.
Answer: The efficiency of a carnot engine is given by:
ñ=1-Tc/TH
=1-300/500
=1-0.6
=0.4
Thus, the efficiency is 40%.
3. Enthalpy, entropy and 2nd law of thermodynamics
The second law, which introduces the concept of entropy, often features in NEET questions involving irreversible processes and entropy changes.
Question C. Find entropy change when 2 moles of an ideal gas expand isothermally from 10 L to 20 L at 300 K.
Answer: Change in entropy (∆S) for an isothermal process is
∆S=nRln(V2/V1)
Where n is the number of moles, R is the gas constant, V2 and V1 are the final and initial volumes, respectively.
∆S=2*8.314ln(20/10)
=2*8.314ln2
=2*8.314*0.693
=11.52
Thus, the entropy change is 11.52 J/K.
Also Read: NEET Physics Chapter-Wise Weightage 2025
Strategies for Preparing for NEET Thermodynamics Questions
- Thoroughly understand the Basic Laws: Start from basics. The Zeroth, First, and Second Laws of Thermodynamics. These laws form the basis of many NEET questions.
- Practice previous years' questions: Many questions in NEET are either repeated or follow similar patterns. Regular practice of NEET previous year question papers will improve speed and accuracy.
- Focus on conceptualized learning: Many questions test conceptual topics rather than rote learning. Be sure that you grasp the underlying principles and can apply them to different scenarios.
- Solve numerical problems: This chapter includes a lot of numerical questions, particularly involving work done, heat transfer, and efficiency. Make sure to practice them thoroughly.
- Stress and time management: During the NEET exam, time management is key to success. Try solving thermodynamics questions in NEET mock test papers within the time limit to improve speed and efficiency.
Also Read: NEET Physics Question Paper 2023, 2022, 2021
Tips for Studying Thermodynamics for NEET 2025
Regular practice, along with a strong understanding of the fundamental laws and equations, will help you excel in the NEET Physics section. Prepare accordingly, stay consistent, and ensure you solve as many practice questions and previous years questions as possible to achieve success in NEET 2025.
- Create summary notes: Jot down key formulas, laws, and concepts in a notebook for quick revisions.
- Use diagrams: Visual aids such as PV diagrams can help in understanding processes like isothermal, adiabatic, and isochoric changes.
- Revise regularly: Revisit the chapter at regular intervals to keep the concepts fresh in your mind.
- Mock tests: Take full-length mock tests under exam conditions to simulate the NEET experience.
In short, it is a very important topic for NEET. By focusing on the important questions outlined above and following a structured study plan, students can significantly improve their performance in this section.
Also Read: NEET Physics Syllabus
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