📅 Published on: 27.12.2025
Kinetic Theory of Gases JEE Mains PYQ – Pdf
Kinetic Theory of Gases (KTG) is one of the most scoring topics in JEE Mains Physics because questions generally test formula-based understanding, conceptual clarity, and quick calculations. Over the years, PYQs (Previous Year Questions) from this chapter have consistently appeared in the paper, making it essential for every aspirant to thoroughly revise this topic.
This article provides a complete overview of KTG, key formulas, expected concepts, and Kinetic Theory of Gases JEE Mains PYQ PDF download link to boost your revision and practice.
⭐ Download Kinetic Theory of Gases JEE Mains PYQ PDF
Click below to access previous year solved questions for practice:
👉 Download PDF:
https://drive.google.com/file/d/1iGewrfH6n3_vyGPyvOiVzqNJYw4l0C1Q/view?usp=drivesdk
Kinetic Theory of Gases JEE Mains PYQ
In JEE Mains, Kinetic Theory of Gases PYQs mainly revolve around the following concepts:
- Mean free path
- Pressure of a gas using molecular collisions
- Root mean square (rms) speed, average speed & most probable speed
- Degrees of freedom and equipartition law
- Specific heat of gases at constant pressure and constant volume
- Boltzmann constant & Avogadro’s number
- Ideal gas assumptions and limitations
Most questions are direct formula-based, and solving PYQs improves accuracy & confidence.
🔹 Important Formulas – Frequently Used in PYQs
| Concept | Formula |
|---|---|
| RMS speed | vrms = √(3RT/M) |
| Average speed | vavg = √(8RT/πM) |
| Most probable speed | vp = √(2RT/M) |
| Relation | vavg > vrms > vp |
| Pressure of gas | P = (1/3)ρvrms2 |
| Mean kinetic energy per molecule | (3/2)kT |
| Energy per mole | (3/2)RT |
| Degrees of freedom & specific heat | CV = (f/2)R, CP = CV + R |
JEE Mains Tip: Always check the unit consistency and molar mass units — many PYQs test accuracy here.
Kinetic Theory of Gases PYQ JEE Mains
Here are the types of PYQs usually asked from KTG:
1️⃣ Speed of gas molecules
- Find the ratio vrms:vavg:vp
- Determine speeds at different temperatures
2️⃣ Concept of degrees of freedom
- Monoatomic, diatomic, and polyatomic gases
- Variation of heat capacities with temperature
3️⃣ Pressure and kinetic energy
- Using molecular interpretation of pressure
- Application in ideal gases
4️⃣ Mean free path
- Effect of temperature, pressure & number density
5️⃣ Heat capacities & equipartition theorem
- Relationship between Cp and Cv
- Gamma ratio γ = CP / CV
JEE Trend: Recent papers include conceptual + formula based MCQs from this chapter.
🎯 How to score full marks in KTG questions
- Memorize speed formulas and their order
- Practice PYQs to understand question style
- Revise Cp–Cv relation and gamma values
- Solve numerical problems with correct unit conversions
💡 Why PYQs are important for KTG?
Because 60–70% of KTG questions in JEE Mains directly match the format & logic of previous year problems. Practicing them reduces exam-time confusion and boosts speed.
👇 Once again, here is your PDF
✔ KTG PYQ JEE Mains PDF:
https://drive.google.com/file/d/1iGewrfH6n3_vyGPyvOiVzqNJYw4l0C1Q/view?usp=drivesdk
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FAQs – Kinetic Theory of Gases JEE Mains PYQ
Q1. What type of questions are generally asked from KTG in JEE Mains?
Questions are mostly formula-based, focusing on molecular speeds, mean free path, Cp–Cv relations, and degrees of freedom.
Q2. Is Kinetic Theory of Gases important for JEE Mains?
Yes, 1–2 questions appear almost every year, making it a scoring chapter with direct application-based problems.
Q3. Which formula is most repeated in KTG PYQs?
The RMS speed formula vrms = √(3RT/M) appears frequently in numerical and conceptual questions.
Q4. What is the correct order of molecular speeds?
The order is vavg > vrms > vp, often asked directly in PYQs.
Q5. Why should I practice previous year questions for KTG?
PYQs help identify repeated patterns, improve speed, and increase scoring potential due to predictable question style.
Q6. What is the relation between Cp and Cv?
For an ideal gas, the relation is CP - CV = R, commonly asked in theoretical and numerical problems.
Q7. What are the degrees of freedom for different types of gases?
Monoatomic = 3, Diatomic = 5 (at room temperature), Polyatomic = 6 — essential for calculating heat capacities.
Q8. On what factor does mean kinetic energy of a gas molecule depend?
It depends only on temperature: (3/2)kT. This is a frequently tested conceptual fact in JEE.
Q9. Does the mass of molecules affect gas pressure?
Yes, pressure depends on mass through RMS speed, given by P = (1/3)ρvrms2.
Q10. How to score full marks in KTG questions?
Focus on formulas, practice PYQs, revise units carefully, and avoid calculation errors — most answers come directly from key equations.
