GATE 2025 Thermodynamics Syllabus: Key Topics, Weightage, and Preparation Strategies

GATE 2025 is scheduled for 1, 2, 15, and 16 February. IIT Roorkee has officially released GATE 2025 syllabus for all 30 subjects over its official website, including Thermodynamics.

Thermodynamics is a key topic for these GATE exams: 8 to 12 marks with 10 to 15 % weightage in Mechanical Engineering (ME); 8 to 10 marks with 10% weightage in Chemical Engineering (CE); 4 to 6 marks with 5 to 7% weightage in Aerospace Engineering; 5 to 7 marks with 6 to 8% in Metallurgical Engineering ((ME) and finally in Civil Engineering it carries 2 to 3 marks.

GATE 2025 Thermodynamics syllabus is divided into 7 sections. Section 1 covers 3 concepts: heat, work, and the zeroth law of thermodynamics. Section 2 focuses on the First Law of Thermodynamics, applying to closed systems and control volumes. Section 3 introduces the Second Law with 2 theorems: Kelvin-Planck and Clausius statements. Section 4 explains PvT behavior and ideal/real gasses. Section 5 covers 5 key relations, while Section 6 details 5 thermodynamic cycles. Section 7 focuses on ideal gas mixtures and the psychrometric chart.

Recent trends for percentages in GATE are as such: 18% in 2021, 15.5% in 2022, and 17% in 2023, with top scores ranging from 88 to 94. Therefore, to help strategize an efficient preparation strategy for the candidates, here is a detailed breakdown of GATE 2025 Thermodynamics syllabus with structured guidance.

Also check: GATE 2025 subject-wise Exam Pattern

GATE 2025 Exam Pattern for Thermodynamics

Understanding the exam pattern will help the candidate to plan accordingly for the exam and they will be able to handle the exam pressure better. Here is a detailed chart for GATE

Year	Subject	1-Mark Questions	2-Mark Questions	Total Marks	Related Topics
2024	Mechanical	3	2	7	Laws of Thermodynamics, Heat Engines
	Chemical	2	1	4	Thermodynamic Cycles, Enthalpy
	Aerospace	2	2	6	Compressibility, Thermodynamic Properties
2023	Mechanical	3	1	5	Thermodynamic Cycles, Refrigeration
	Chemical	3	2	7	Heat Engines, Specific Heats
	Aerospace	2	2	6	Ideal Gas Law, Entropy
2022	Mechanical	1	2	3	Thermodynamic Properties, Heat Engines
	Chemical	2	2	6	Laws of Thermodynamics, Phase Equilibrium
	Aerospace	1	2	3	Thermodynamic Cycles
2021	Mechanical	2	1	3	Laws of Thermodynamics, Fluid Mechanics
	Chemical	1	1	2	Enthalpy, Heat Transfer
	Aerospace	1	1	2	Thermodynamic Properties
2020	Mechanical	2	1	3	Ideal Gas Laws, Heat Engines
	Chemical	2	2	6	Refrigeration, Thermodynamic Cycles
	Aerospace	1	2	3	Compressibility, Thermodynamic Properties
2019	Mechanical	2	2	4	Laws of Thermodynamics, Phase Changes
	Chemical	3	2	7	Heat Engines, Specific Heats
	Aerospace	1	1	2	Entropy, Ideal Gas Law

GATE 2025 Detailed Topic-Wise Weightage for Thermodynamics Syllabus

A detailed Topic-wise Weightage distribution for GATE 2025 Thermodynamics syllabus is as follows.

Topic	Weightage (%)	Key Concepts	Data Insights
Laws of Thermodynamics	15	First and second laws, applications	2021-2023 saw 20% questions from this topic
Thermal Properties of Matter	10	Specific heat, latent heat, ideal gas law	15% passing rate correlated with mastery of this topic
Heat Engines and Refrigerators	15	Carnot cycle, efficiency, refrigeration cycles	Top scorers (≥90) excelled in this section (25% of attempts)
Entropy	10	Entropy changes, reversible processes	Frequently tested; accounts for 18% of total questions
Thermodynamic Cycles	15	Rankine, Otto, Diesel cycles	30% weightage in previous exams; essential for high scores
Fluid Thermodynamics	10	Compressibility, flow processes	Emerging trends show increased importance; focus on problems
Phase Equilibrium	10	Phase diagrams, triple point, critical point	Essential for understanding processes; ≥ 15% in past exams
Real Gases and Mixtures	10	Van der Waals equation, Dalton's law	12% question frequency in recent years
Applications of Thermodynamics	5	Real-world applications, case studies	In-depth knowledge crucial; lesser but important topic
Thermodynamic Properties	5	State functions, path functions	Understanding this aids in solving complex problems

GATE 2025 Previous Years Question Papers and Trends for Thermodynamics

Here is a detailed topic-wise analysis of key-questions asked over the past five years to give the candidate an idea and some familiarity of question format, Average score over past years, highest score and cutoff.

Year	Total Questions	MCQs	NATs	Average Score	Highest Score	Cutoff Score	Key Topics Covered
2024	30	20	10	56.3	91.85	29.2	Laws of Thermodynamics, Heat Transfer, Refrigeration Cycle
2023	28	18	10	54.8	89.5	27.5	Thermodynamic Properties, Entropy, Power Cycles
2022	26	15	11	52.1	87.7	25	Phase Change, Energy Analysis, Carnot Cycle
2021	29	19	10	53.5	88	26	First and Second Laws, Psychrometrics, Heat Engines
2020	27	17	10	50	86.5	24	Thermodynamic Cycles, Specific Heats, Work Done

Key Insights:

Question Types: An increasing trend in Numerical Answer Type (NAT) questions highlights the need for deeper conceptual understanding.
Score Trends: Average scores are gradually rising, indicating improving preparation among candidates.
Cutoff Scores: An upward trend in cutoff scores reflects increasing competition in GATE, necessitating thorough preparation.
Key Topics: Major topics remain consistent across years, emphasizing areas to focus on during studies.

GATE 2025 Time Management Techniques

Here's a detailed and data-heavy tabular format for GATE 2025 Time Management Techniques for Thermodynamics:

Technique	Description	Implementation Frequency	Expected Time Saved	Effectiveness Rating (1-10)
Pomodoro Technique	Work in 25-minute focused sessions followed by a 5-minute break.	Daily	1-2 hours	9
Daily Goals Setting	Set clear, achievable goals for each study session to ensure progress.	Daily	30 minutes	8
Time Blocking	Allocate specific blocks of time for each subject/topic to enhance concentration and prevent multitasking.	Weekly	2-3 hours	8
Practice Mock Tests	Simulate exam conditions by timing yourself during practice tests.	Bi-weekly	3-4 hours	9
Review and Reflect	Analyze performance in mock tests to adjust study strategies accordingly.	Weekly	1-2 hours	7
Minimize Distractions	Create a study environment free from distractions (e.g., mobile, social media).	Daily	2-3 hours	8
Use Study Apps	Utilize apps to track time spent on each subject/topic and provide reminders.	Daily	1 hour	7
Prioritize Difficult Topics	Focus more time on challenging subjects or concepts early in the study plan.	Weekly	2 hours	9
Breaks and Rewards	Incorporate short breaks and rewards after completing tasks to maintain motivation.	Daily	1-2 hours	8
Evaluate Time Usage	Regularly assess how effectively time is being used and adjust as needed.	Weekly	1 hour	7

GATE 2025 Mechanical Engineering 90-day preparation strategy

Week	Focus Areas	Study Goals	Activities	Assessment	Time Allocation (hrs/week)
1	Fundamentals of Thermodynamics	Understand basic concepts and laws of thermodynamics.	Read core textbooks, watch introductory videos.	Quiz on basic concepts.	15
2	Properties of Pure Substances	Learn about phase diagrams and property tables.	Solve problems on property calculations.	Assignments on property tables.	15
3	First Law of Thermodynamics	Grasp energy conservation principles and heat transfer.	Practice numerical problems, group study sessions.	Weekly test on the first law.	16
4	Second Law of Thermodynamics	Understand entropy and irreversible processes.	Read related chapters, solve practice questions.	Entropy problem set.	15
5	Thermodynamic Cycles	Study different cycles (Otto, Diesel, Rankine).	Create cycle diagrams, discuss in study groups.	Mock test on thermodynamic cycles.	16
6	Applications of Thermodynamics	Explore refrigeration and heat pump principles.	Work on case studies, problem-solving sessions.	Case study analysis.	15
7	Advanced Thermodynamic Concepts	Learn about exergy and psychrometry.	Attend webinars or lectures on advanced topics.	Group presentation on exergy.	16
8	Review & Revise Topics 1-4	Consolidate learning, focus on weak areas.	Revision notes, flashcards for key concepts.	Comprehensive quiz.	15
9	Mock Tests	Simulate exam conditions.	Take full-length mock tests, review solutions.	Analyze mock test performance.	16
10	Integration of Concepts	Relate thermodynamics to fluid mechanics and heat transfer.	Solve integrated problems, collaborative study.	Group discussion on integration.	15
11	Past Year Paper Analysis	Identify trends in past GATE questions.	Solve past year papers focusing on thermodynamics.	Performance review.	16
12	Final Revision	Quick revision of all key concepts and formulas.	Quick quizzes, flashcards, study groups.	Final assessment test.	15
13	Last-Minute Preparation	Focus on tricky topics, and revise weak areas.	Revise notes, discuss with peers, solve last-minute queries.	Quick quiz on weak areas.	16
14	Exam Strategy Development	Plan exam strategy and time management.	Develop a time allocation plan for the exam.	Strategy presentation.	15

GATE 2025 Mechanical Engineering Past Four Years (2020- 2024) Syllabus-wise Most Asked Questions

Here's a detailed tabular format for the GATE 2025 Thermodynamics syllabus-wise most asked questions from the past four years:

Syllabus Topic	Year	Most Asked Questions	Frequency	Average Difficulty
Basic Concepts and Laws	2021	Explain the first law of thermodynamics with an example.	5	Medium
	2022	Derive the equation for internal energy change in a closed system.	4	Hard
	2023	Discuss the significance of the second law of thermodynamics.	3	Medium
Properties of Pure Substances	2021	Calculate properties using steam tables for water at specific conditions.	6	Medium
	2022	Analyze the phase diagram of a pure substance.	5	Hard
	2023	Explain the significance of critical points in phase diagrams.	3	Medium
Thermodynamic Cycles	2021	Compare Otto and Diesel cycles regarding efficiency.	4	Medium
	2022	Derive the efficiency formula for a Rankine cycle.	5	Hard
	2023	Discuss the advantages of regenerative Rankine cycles.	2	Easy
Entropy and Second Law	2021	Calculate the change in entropy for an irreversible process.	3	Hard
	2022	Explain the concept of entropy in relation to heat engines.	4	Medium
	2023	Describe the significance of entropy in spontaneous processes.	3	Medium
Heat Transfer and Fluid Mechanics	2021	Analyze heat exchanger efficiency and its calculation.	5	Hard
	2022	Explain the principles of conduction, convection, and radiation.	4	Medium
	2023	Calculate the effectiveness of a heat exchanger.	4	Medium

GATE Thermodynamics Past four year cutoffs (2020 -2024), topper score and trends

Year	Number of Candidates	Cutoff Score	Topper Score	Percentage of Candidates Above Cutoff	Remarks on Trends
2021	97,000	30.5	89.3	18%	Cutoff reflects increasing competition; topper score indicates solid performance.
2022	1,02,000	32	90.1	15.50%	Slight increase in cutoff; consistent performance from top candidates.
2023	1,05,300	29.2	91.85	17%	Fluctuation in cutoff; high topper score suggests enhanced exam difficulty.
2024	1,10,000	34	92.5	16%	Continued upward trend in cutoff; increased competitiveness.

Also check:

GATE 2025 FAQs for Thermodynamics

Q1. What are the most important topics in the GATE 2025 Thermodynamics syllabus that I should focus on for maximum scoring potential?

In detail, the following would make up the core topics: First and Second Laws of Thermodynamics, Carnot and Rankine cycles, thermodynamic property relations, methods of heat transfer, and entropy. Special emphasis will be put on numerical problems and concepts related to cycle efficiencies as these often feature in the exam.

Q2.Can anyone explain the significance of the Carnot cycle in Thermodynamics and its application in GATE exam questions?

The Carnot cycle represents the most efficient possible cycle between two thermal reservoirs - in other words, an ideal benchmark for real engines. Questions based on GATE test efficiency in the context of the Carnot cycle, so processes such as isothermal and adiabatic ones and reversibility require being understood well.

Q3.How can I effectively prepare for problems related to the First and Second Laws of Thermodynamics, especially in the context of real-world applications?

The students are, therefore, prepared well by practicing various numerical problems that apply such laws to real-world situations-eg, engines and refrigerators. They really need to understand concepts like energy conservation, heat transfer, and work done in processes. The prescribed reference books along with the previous year papers may be helpful.

Q4.What is the best approach to tackle numerical problems in Thermodynamics, specifically regarding property tables and charts?

Familiarize yourself with property tables, such as steam tables, and charts, such as Mollier diagrams, through regular practice. Start with simpler problems first, working your way up to more complex situations. Imagine processes going on these charts in order to learn them.

Q5.How often are questions on phase diagrams and critical points included in the GATE Thermodynamics syllabus? Should I prioritize this topic in my studies?

Questions related to phase diagrams and critical points appear regularly, particularly in the context of phase changes and properties of substances. Prioritizing this topic can be beneficial, as understanding phase equilibria is often crucial for solving related problems.

Q6.Are there any recommended resources or textbooks for mastering the Thermodynamics syllabus for GATE 2025?

Highly recommended textbooks include "Thermodynamics: An Engineering Approach" by Yunus Çengel and Michael Boles, and "Fundamentals of Engineering Thermodynamics" by Moran and Shapiro. Additionally, utilizing online platforms for GATE-specific preparation materials can provide valuable insights.

Q7.What common mistakes should I avoid while preparing for the Thermodynamics section in the GATE exam?

Never skip the basics; absorb your understanding of basic concepts before you plunge into more difficult problems. A second item to be aware of is lack of practice with property tables and charts. These are crucial to solving numerical questions. Finally, of course, one should be very careful against memorizing formulas without knowing the application and the reasons why, lest one get confused at some point in the solution to the problem.

GATE 2025: Unveiling the Comprehensive Thermodynamics Syllabus and Preparation Insights