# Topic Questions: 1 state the basic assumptions of the kinetic theory of gases — 9702 P4 Kinetic theory of gases

> 5 9702 P4 Kinetic theory of gases topic questions (8 marks) on 1 state the basic assumptions of the kinetic… — 3 papers, 2025–2026. Open the exact question…

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CIE IAL · Physics · 9702 P4 · Kinetic theory of gases

5 9702 P4 Kinetic theory of gases topic questions are tagged to this syllabus point across 3 papers (2025–2026). Only the parts whose knowledge graph matches this syllabus statement are counted, and the table shows which parts of each question are involved.

- 5 topic questions
- 3 papers
- 8 tagged marks
- 15.6% of topic questions
- 11.4% of topic marks
- 2025–2026
- Syllabus 2025–2027
- [All 9702 P4 Kinetic theory of gases topic questions](https://www.examsci.com/topics/cie-ial/physics/9702-paper-4/kinetic-theory-of-gases/)
- [All paper codes](https://www.examsci.com/topics/)

Core finding

**This Kinetic theory of gases syllabus point appears in 3 9702 P4 papers across 2025–2026, contributing 5 topic questions and 8 marks.** The most recent appearance is 9702/42 May/June 2026. That equals 15.6% of the 32 topic questions and 11.4% of the 70 marks tagged to Kinetic theory of gases. Only parts tagged to this subtopic are counted, so a four-part question can contribute one item and one part's marks. The table lists every matching question, its tagged parts and marks, with a link back to the paper page. Sessions are newest first, so the statement can be traced back through the full paper history.

## Topic questions by session

Newest sessions first. Parts and marks count only the parts tagged to this subtopic; “x of y parts” shows how much of the question is tagged elsewhere. Select the paper cell to open the matching question on the paper page, or use **Go to Practice Hub** to answer that exact question in the Interactive Practice Hub.

| Paper | Question | Type | Parts | Marks | Difficulty | Practice |
| --- | --- | --- | --- | --- | --- | --- |
| [**9702/42** May/June 2026 · CIE IAL](https://www.examsci.com/past-papers/cie-ial/physics/9702-paper-4/2026-may-june-9702-42/#q-4) | **Q4** Kinetic Theory Derivation of Gas Pressure - CIE A-Level Physics 2026 Jun Paper 42 Q4 | FRQ | 1 of 6 parts ((a)) | 2 of 10 on the paper | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=a6b3f991-4e08-4777-b0c1-71ae2ebf6845&question_id=8e4ab4f7-27fa-47da-8a18-f882a8eee6e3&source_detail=9702%2F42+May%2FJune+2026) |
| [**9702/44** May/June 2026 · CIE IAL](https://www.examsci.com/past-papers/cie-ial/physics/9702-paper-4/2026-may-june-9702-44/#q-4) | **Q4** Thermodynamics and Ideal Gas Internal Energy - CIE A-Level Physics 2026 Jun Paper 44 Q4 | FRQ | 1 of 8 parts ((b)(iv)) | 1 of 13 on the paper | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=92110ebb-9742-4a78-840d-cc028724e060&question_id=40fe9003-fba9-497c-9bb2-c759ecec15c4&source_detail=9702%2F44+May%2FJune+2026) |
| [**9702/42** October/November 2025 · CIE IAL](https://www.examsci.com/past-papers/cie-ial/physics/9702-paper-4/2025-october-november-9702-42/#q-2) | **Q2** Gravitation Law and Ideal Gas Assumptions - CIE Physics 2025 Nov Paper 42 Q2 | FRQ | 3 of 6 parts ((b), (c)(ii), (d)(ii)) | 5 of 11 on the paper | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=be8ce179-8cd6-48f3-9c64-978393c433d0&question_id=011f85ec-4965-4b6b-a3f0-48ff9e236c5c&source_detail=9702%2F42+October%2FNovember+2025) |

## Related topic questions in Kinetic theory of gases

- [2 explain how molecular movement causes the pressure exerted by a gas and derive and use the relationship $pV = \frac{1}{3}Nm\langle c^2 \rangle$, where $\langle c^2 \rangle$ is the mean-square speed (a simple model considering one-dimensional collisions and then extending to three dimensions using $\frac{1}{3}\langle c^2 \rangle = \langle c_x^2 \rangle$ is sufficient)](https://www.examsci.com/topics/cie-ial/physics/9702-paper-4/kinetic-theory-of-gases/2-explain-how-molecular-movement-causes-the-pressure-exerted-by-a-gas-and-derive-and/) — 7 question items · 3 papers — 13 marks · 2025–2026
- [3 understand that the root-mean-square speed $c_{r.m.s.}$ is given by $\sqrt{\langle c^2 \rangle}$](https://www.examsci.com/topics/cie-ial/physics/9702-paper-4/kinetic-theory-of-gases/3-understand-that-the-root-mean-square-speed-c-r-m-s-is-given-by-sqrt-langle-c-2/) — 5 question items · 5 papers — 11 marks · 2025–2026
- [4 compare $pV = \frac{1}{3}Nm\langle c^2 \rangle$ with $pV = NkT$ to deduce that the average translational kinetic energy of a molecule is $\frac{3}{2}kT$, and recall and use this expression](https://www.examsci.com/topics/cie-ial/physics/9702-paper-4/kinetic-theory-of-gases/4-compare-pv-frac-1-3-nm-langle-c-2-rangle-with-pv-nkt-to-deduce-that-the-average/) — 18 question items · 11 papers — 45 marks · 2025–2026

## Topic question rules and edge cases

**How many topic questions cover this syllabus point?**

3 question stems cover this subtopic across 3 papers, but only 5 tagged parts and 8 marks belong to it. Other parts of the same questions are assessed under different statements and are excluded from this page.

**Which papers include this subtopic?**

The table lists every matching session from 2025–2026. Each row links to the question anchor on the paper page, where the full paper context and practice entry point are available.

**Why can one question appear under several subtopics?**

The parts of one question can assess different syllabus statements. Each part is counted under its own subtopics, so the same question stem can appear on several subtopic pages while each page lists only the parts and marks tagged to that statement.

**Can I practise these questions with AI marking?**

Yes. Open a paper from the table and use the Interactive Practice Hub entry point. The page itself is static HTML so search engines and retrieval agents can read the full question list without executing JavaScript.

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