# 9702/13 May/June 2018

> 9702/13 May/June 2018: 40 questions, 40 marks. Difficulty 0.31, deviation 0.12, algebraic 0.29, text density 0.36. CIE IAL Physics 9702 P1.

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CIE IAL · Physics · 2018 May/June

This Physics 9702 Paper 1 (Multiple Choice) paper contains 40 questions worth 40 marks. The profile below reports five mark-weighted difficulty and complexity measures, and every question row repeats them. Full question text and mark scheme open in the Interactive Practice Hub.

- CIE IAL
- 9702 P1
- 40 questions
- 40 marks
- Free paper
- [Practise this paper](https://www.examsci.com/practice?set_id=131fa3c2-21cf-4f33-a7ca-bf3e1a8d5109)
- [All 9702 P1 papers](https://www.examsci.com/past-papers/cie-ial/physics/9702-paper-1/)

Core finding

**9702/13 May/June 2018 is a past paper for CIE IAL Physics 9702 Paper 1 (Multiple Choice), with 40 questions worth 40 marks.** Its mark-weighted Difficulty Measure is 0.31 on a 0.20–0.75 scale, with a Difficulty Deviation of 0.12 and a mark split of 57.5% Easy, 42.5% Medium and 0.0% Hard. Algebraic complexity averages 0.29; text density and modelling average 0.36. All five measures use 40 part-level tags, not candidate results. Every question row below repeats them and opens the Interactive Practice Hub for that question.

## Difficulty & complexity profile

All five measures are mark-weighted and calculated from 40 parts carrying 40 part marks. Difficulty tags cover 40 parts, algebraic tags 40 and text-density tags 40. Tags are internal metadata, not official exam-board ratings.

- **Difficulty Measure**: 0.31 — 0.20–0.75 · nearer Easy
- **Difficulty Deviation**: 0.12 — 0 = uniform; higher = more mixed
- **Difficulty Ratio**: 57.5 / 42.5 / 0.0 — % Easy / Medium / Hard
- **Algebraic Complexity Measure**: 0.29 — 0.20–0.75 · nearer Low
- **Text Density and Modelling Measure**: 0.36 — 0.20–0.75 · nearer Medium

Scale: Easy 0.20 · Medium 0.45 · Hard 0.75, and Low 0.20 · Medium 0.45 · High 0.75 for the two complexity measures. [How each band is defined and how the values are calculated →](https://www.examsci.com/guides/difficulty-and-complexity-measures/)

### Definitions and calculation

| Measure | Paper value | Formula |
| --- | --- | --- |
| **Difficulty Measure** | 0.31 | Σ(d_i × w_i) / Σw_i, with d = 0.20 / 0.45 / 0.75 |
| **Difficulty Deviation** | 0.12 | √(Σw_i(d_i − μ)^2 / Σw_i) |
| **Difficulty Ratio** | 57.5% Easy / 42.5% Medium / 0.0% Hard | marks in band / all tagged marks |
| **Algebraic Complexity Measure** | 0.29 | Σ(c_i × marks_i) / Σmarks_i, with c = 0.20 / 0.45 / 0.75 |
| **Text Density and Modelling Measure** | 0.36 | Σ(t_i × marks_i) / Σmarks_i, with t = 0.20 / 0.45 / 0.75 |

w_i equals the part marks, except for a Hard part worth 4 or more marks, where w_i = marks^0.75 to offset the accessible starter steps inside long structured questions.

## Question list

Each measure is recalculated from the parts of that question and uses the same weights as the paper profile.

| Question | Topic | Marks | Difficulty Measure | Algebraic Complexity Measure | Text Density and Modelling Measure | Practice |
| --- | --- | --- | --- | --- | --- | --- |
| **Q1** FRQ | [1.1 Physical quantities](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/physical-quantities/) | 1 | 0.20 Easy | 0.20 Low | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=131fa3c2-21cf-4f33-a7ca-bf3e1a8d5109&question_id=4ca785f7-7f88-4ba5-baa4-4732bb0812d5&source_detail=9702%2F13+May%2FJune+2018) |
| **Q2** FRQ | [1.4 Scalars and vectors](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/scalars-and-vectors/) | 1 | 0.20 Easy | 0.20 Low | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=131fa3c2-21cf-4f33-a7ca-bf3e1a8d5109&question_id=44b2871e-a2f0-445b-9f24-de7a179d7343&source_detail=9702%2F13+May%2FJune+2018) |
| **Q3** FRQ | [1.4 Scalars and vectors](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/scalars-and-vectors/) | 1 | 0.20 Easy | 0.20 Low | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=131fa3c2-21cf-4f33-a7ca-bf3e1a8d5109&question_id=f2de88b5-f9b5-420b-b8bd-2a74cfeb5a69&source_detail=9702%2F13+May%2FJune+2018) |
| **Q4** FRQ | [2.2 Errors and uncertainties](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/errors-and-uncertainties/) | 1 | 0.20 Easy | 0.20 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=131fa3c2-21cf-4f33-a7ca-bf3e1a8d5109&question_id=a05cecee-7adf-49dc-8173-c3631861d7be&source_detail=9702%2F13+May%2FJune+2018) |
| **Q5** FRQ | [2.2 Errors and uncertainties](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/errors-and-uncertainties/) | 1 | 0.45 Medium | 0.45 Medium | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=131fa3c2-21cf-4f33-a7ca-bf3e1a8d5109&question_id=49dbd185-de4b-4505-acf3-04579f2a08e6&source_detail=9702%2F13+May%2FJune+2018) |
| **Q6** FRQ | [3.1 Equations of motion](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/equations-of-motion/) | 1 | 0.20 Easy | 0.20 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=131fa3c2-21cf-4f33-a7ca-bf3e1a8d5109&question_id=5269bc36-8e0f-497e-ae22-24c5b49eba8a&source_detail=9702%2F13+May%2FJune+2018) |
| **Q7** FRQ | [4.1 Momentum and Newton’s laws of motion](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/momentum-and-newton-s-laws-of-motion/) | 1 | 0.45 Medium | 0.45 Medium | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=131fa3c2-21cf-4f33-a7ca-bf3e1a8d5109&question_id=41d26782-185c-4040-a9ec-4ae422edd985&source_detail=9702%2F13+May%2FJune+2018) |
| **Q8** FRQ | [3.1 Equations of motion](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/equations-of-motion/) | 1 | 0.45 Medium | 0.20 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=131fa3c2-21cf-4f33-a7ca-bf3e1a8d5109&question_id=db151d4f-a296-4926-903f-7648e5eece28&source_detail=9702%2F13+May%2FJune+2018) |
| **Q9** FRQ | [4.3 Linear momentum and its conservation](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/linear-momentum-and-its-conservation/) | 1 | 0.45 Medium | 0.45 Medium | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=131fa3c2-21cf-4f33-a7ca-bf3e1a8d5109&question_id=58ebfe5b-5fab-45e9-903e-ea31cc6f275d&source_detail=9702%2F13+May%2FJune+2018) |
| **Q10** FRQ | [5.1 Types of force](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/) | 1 | 0.20 Easy | 0.20 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=131fa3c2-21cf-4f33-a7ca-bf3e1a8d5109&question_id=578e037d-4f48-43c3-831c-378de94ef96b&source_detail=9702%2F13+May%2FJune+2018) |
| **Q11** FRQ | [5.4 Density and pressure](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/density-and-pressure/) | 1 | 0.45 Medium | 0.45 Medium | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=131fa3c2-21cf-4f33-a7ca-bf3e1a8d5109&question_id=476484a3-fbe8-4924-a78b-c56b8f472750&source_detail=9702%2F13+May%2FJune+2018) |
| **Q12** FRQ | [5.2 Turning effects of forces](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/turning-effects-of-forces/) | 1 | 0.20 Easy | 0.20 Low | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=131fa3c2-21cf-4f33-a7ca-bf3e1a8d5109&question_id=7300773d-3f63-45e8-99ef-663d6c4063ba&source_detail=9702%2F13+May%2FJune+2018) |
| **Q13** FRQ | [5.4 Density and pressure](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/density-and-pressure/) | 1 | 0.45 Medium | 0.45 Medium | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=131fa3c2-21cf-4f33-a7ca-bf3e1a8d5109&question_id=3345edc6-245d-4bf5-986e-af69c511a489&source_detail=9702%2F13+May%2FJune+2018) |
| **Q14** FRQ | [6.2 Work and efficiency](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/) | 1 | 0.20 Easy | 0.20 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=131fa3c2-21cf-4f33-a7ca-bf3e1a8d5109&question_id=e46de4b2-3f9d-4291-8e93-0ae6664eaeea&source_detail=9702%2F13+May%2FJune+2018) |
| **Q15** FRQ | [6.2 Work and efficiency](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/) | 1 | 0.45 Medium | 0.45 Medium | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=131fa3c2-21cf-4f33-a7ca-bf3e1a8d5109&question_id=5a5e6b0d-b471-4ce4-8c63-1b609bf5871b&source_detail=9702%2F13+May%2FJune+2018) |
| **Q16** FRQ | [6.1 Energy conversion and conservation](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/) | 1 | 0.20 Easy | 0.20 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=131fa3c2-21cf-4f33-a7ca-bf3e1a8d5109&question_id=a94ee665-67a0-482b-aedb-49a5fec3089e&source_detail=9702%2F13+May%2FJune+2018) |
| **Q17** FRQ | [6.4 Power](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/) | 1 | 0.45 Medium | 0.45 Medium | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=131fa3c2-21cf-4f33-a7ca-bf3e1a8d5109&question_id=3c49ee31-aa37-499f-ad8c-82bfc2708c8c&source_detail=9702%2F13+May%2FJune+2018) |
| **Q18** FRQ | [9.1 Stress and strain](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/stress-and-strain/) | 1 | 0.45 Medium | 0.45 Medium | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=131fa3c2-21cf-4f33-a7ca-bf3e1a8d5109&question_id=8b19a14e-7671-44af-8bfc-2eccd158ace7&source_detail=9702%2F13+May%2FJune+2018) |
| **Q19** FRQ | [9.2 Elastic and plastic behaviour](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/elastic-and-plastic-behaviour/) | 1 | 0.20 Easy | 0.20 Low | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=131fa3c2-21cf-4f33-a7ca-bf3e1a8d5109&question_id=65583ee6-ece3-4c58-bab7-e6b9105635d8&source_detail=9702%2F13+May%2FJune+2018) |
| **Q20** FRQ | [14.1 Progressive waves](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/progressive-waves/) | 1 | 0.45 Medium | 0.20 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=131fa3c2-21cf-4f33-a7ca-bf3e1a8d5109&question_id=8aada7b0-544c-479e-9877-daf90657fc84&source_detail=9702%2F13+May%2FJune+2018) |
| **Q21** FRQ | [14.2 Transverse and longitudinal waves](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/transverse-and-longitudinal-waves/) | 1 | 0.20 Easy | 0.20 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=131fa3c2-21cf-4f33-a7ca-bf3e1a8d5109&question_id=5ebfd76e-4a56-49bd-8c36-eb2ad8550c74&source_detail=9702%2F13+May%2FJune+2018) |
| **Q22** FRQ | [14.3 Determination of frequency and wavelength of sound waves](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/) | 1 | 0.20 Easy | 0.20 Low | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=131fa3c2-21cf-4f33-a7ca-bf3e1a8d5109&question_id=61c422a2-894b-459e-8c41-b876d8962606&source_detail=9702%2F13+May%2FJune+2018) |
| **Q23** FRQ | [14.4 Doppler effect](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/) | 1 | 0.20 Easy | 0.20 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=131fa3c2-21cf-4f33-a7ca-bf3e1a8d5109&question_id=f9c6b9b1-f943-48fe-94fa-02ad2610bbd0&source_detail=9702%2F13+May%2FJune+2018) |
| **Q24** FRQ | [15.1 Stationary waves](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/stationary-waves/) | 1 | 0.45 Medium | 0.45 Medium | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=131fa3c2-21cf-4f33-a7ca-bf3e1a8d5109&question_id=7ebcd4f4-a786-428e-ab13-8965d2aadd06&source_detail=9702%2F13+May%2FJune+2018) |
| **Q25** FRQ | [15.2 Diffraction](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/diffraction/) | 1 | 0.20 Easy | 0.20 Low | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=131fa3c2-21cf-4f33-a7ca-bf3e1a8d5109&question_id=f55d3cf0-51d4-4e34-b8ba-e56d44730025&source_detail=9702%2F13+May%2FJune+2018) |
| **Q26** FRQ | [15.3 Interference, two-source interference](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/) | 1 | 0.20 Easy | 0.20 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=131fa3c2-21cf-4f33-a7ca-bf3e1a8d5109&question_id=58c8d5b0-ced4-488a-83a7-272353ffbbfa&source_detail=9702%2F13+May%2FJune+2018) |
| **Q27** FRQ | [17.2 Uniform electric fields](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/) | 1 | 0.45 Medium | 0.45 Medium | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=131fa3c2-21cf-4f33-a7ca-bf3e1a8d5109&question_id=b63b9ce1-0401-45f6-8169-82c759a4e2cb&source_detail=9702%2F13+May%2FJune+2018) |
| **Q28** FRQ | [17.2 Uniform electric fields](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/) | 1 | 0.45 Medium | 0.45 Medium | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=131fa3c2-21cf-4f33-a7ca-bf3e1a8d5109&question_id=241a9981-754f-4888-a136-ccc2109a3053&source_detail=9702%2F13+May%2FJune+2018) |
| **Q29** FRQ | [19.1 Electric current](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/electric-current/) | 1 | 0.20 Easy | 0.20 Low | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=131fa3c2-21cf-4f33-a7ca-bf3e1a8d5109&question_id=f789fedb-7040-45ee-b830-6ed8b23097ea&source_detail=9702%2F13+May%2FJune+2018) |
| **Q30** FRQ | [19.1 Electric current](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/electric-current/) | 1 | 0.45 Medium | 0.45 Medium | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=131fa3c2-21cf-4f33-a7ca-bf3e1a8d5109&question_id=80cb0aa0-3c95-42f6-a66f-2cb237abac6c&source_detail=9702%2F13+May%2FJune+2018) |
| **Q31** FRQ | [20.1 Practical circuits](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/practical-circuits/) | 1 | 0.20 Easy | 0.20 Low | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=131fa3c2-21cf-4f33-a7ca-bf3e1a8d5109&question_id=b1facb14-54e0-49f9-b589-a76aeda3e674&source_detail=9702%2F13+May%2FJune+2018) |
| **Q32** FRQ | [19.3 Resistance and resistivity](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/resistance-and-resistivity/) | 1 | 0.20 Easy | 0.20 Low | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=131fa3c2-21cf-4f33-a7ca-bf3e1a8d5109&question_id=c0bb8030-e5fe-474a-a92a-82824aa91a51&source_detail=9702%2F13+May%2FJune+2018) |
| **Q33** FRQ | [19.3 Resistance and resistivity](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/resistance-and-resistivity/) | 1 | 0.20 Easy | 0.20 Low | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=131fa3c2-21cf-4f33-a7ca-bf3e1a8d5109&question_id=fb0defda-c1fb-49dc-9c4b-96d2da72af59&source_detail=9702%2F13+May%2FJune+2018) |
| **Q34** FRQ | [20.2 Kirchhoff’s laws](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/kirchhoff-s-laws/) | 1 | 0.45 Medium | 0.45 Medium | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=131fa3c2-21cf-4f33-a7ca-bf3e1a8d5109&question_id=b47627ce-72c5-47f4-8e14-e7d12f59004f&source_detail=9702%2F13+May%2FJune+2018) |
| **Q35** FRQ | [20.2 Kirchhoff’s laws](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/kirchhoff-s-laws/) | 1 | 0.45 Medium | 0.45 Medium | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=131fa3c2-21cf-4f33-a7ca-bf3e1a8d5109&question_id=617d4193-6df6-4913-b413-7818452190e3&source_detail=9702%2F13+May%2FJune+2018) |
| **Q36** FRQ | [20.1 Practical circuits](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/practical-circuits/) | 1 | 0.20 Easy | 0.20 Low | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=131fa3c2-21cf-4f33-a7ca-bf3e1a8d5109&question_id=a201fceb-d8a8-4a19-b0fb-363e41e69f1c&source_detail=9702%2F13+May%2FJune+2018) |
| **Q37** FRQ | [20.3 Potential dividers](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/potential-dividers/) | 1 | 0.20 Easy | 0.20 Low | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=131fa3c2-21cf-4f33-a7ca-bf3e1a8d5109&question_id=55972a4c-aef4-4007-9831-281c4c75c184&source_detail=9702%2F13+May%2FJune+2018) |
| **Q38** FRQ | [20.3 Potential dividers](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/potential-dividers/) | 1 | 0.45 Medium | 0.45 Medium | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=131fa3c2-21cf-4f33-a7ca-bf3e1a8d5109&question_id=76bc05a7-6d21-42ae-87a1-5a6c1d39c117&source_detail=9702%2F13+May%2FJune+2018) |
| **Q39** FRQ | [26.1 Atoms, nuclei and radiation](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/atoms-nuclei-and-radiation/) | 1 | 0.20 Easy | 0.20 Low | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=131fa3c2-21cf-4f33-a7ca-bf3e1a8d5109&question_id=9a5308b3-c5fd-4fe3-b411-c79ad4ffe4a6&source_detail=9702%2F13+May%2FJune+2018) |
| **Q40** FRQ | [26.2 Fundamental particles](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/fundamental-particles/) | 1 | 0.20 Easy | 0.20 Low | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=131fa3c2-21cf-4f33-a7ca-bf3e1a8d5109&question_id=3dc5c8e5-af15-4abe-9224-5b96cd5db1b8&source_detail=9702%2F13+May%2FJune+2018) |

## Topics in this paper

- [1.1 Physical quantities](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/physical-quantities/)
- [1.4 Scalars and vectors](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/scalars-and-vectors/)
- [2.2 Errors and uncertainties](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/errors-and-uncertainties/)
- [9.1 Stress and strain](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/stress-and-strain/)
- [3.1 Equations of motion](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/equations-of-motion/)
- [4.1 Momentum and Newton’s laws of motion](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/momentum-and-newton-s-laws-of-motion/)
- [4.2 Non-uniform motion](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/non-uniform-motion/)
- [4.3 Linear momentum and its conservation](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/linear-momentum-and-its-conservation/)
- [5.1 Types of force](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/)
- [5.4 Density and pressure](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/density-and-pressure/)
- [5.2 Turning effects of forces](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/turning-effects-of-forces/)
- [6.2 Work and efficiency](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/)

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## Paper FAQ

**How are the difficulty and complexity measures calculated?**

Each part is weighted by its official marks. Difficulty uses Easy 0.20, Medium 0.45 and Hard 0.75; algebraic complexity and text density and modelling use Low 0.20, Medium 0.45 and High 0.75. A Hard part worth 4 or more marks is down-weighted to marks^0.75, so the accessible starter steps inside a long structured question do not inflate the difficulty result. This paper's Difficulty Measure is 0.31 from 40 parts.

**What does the Difficulty Deviation show?**

It is the mark-weighted standard deviation of the part difficulty values around the paper mean. A value of 0 would mean every tagged part has the same difficulty; this paper's deviation is 0.12, so its parts are more mixed than a single-level paper.

**Is the Difficulty Ratio based on question counts or marks?**

It is based on official marks, not question counts. This paper's shares are 57.5% Easy, 42.5% Medium and 0.0% Hard; the three shares sum to 100% before rounding.

**Are these official difficulty ratings?**

No. They are derived from the platform's part-level difficulty and static-question-profile tags. They are not exam-board grade boundaries and are not calculated from candidate outcomes. Use them to compare the demand profile of papers, not to predict a grade.

**Why does each question row show its own measures?**

Each row recalculates the same mark-weighted formula from that question's parts. A single-part MCQ therefore shows the tag value directly, while a multi-part structured question blends the tags of its parts using the same Hard-part decay as the paper profile.

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Full page with native tables, bar charts and Practice Hub links: https://www.examsci.com/past-papers/cie-ial/physics/9702-paper-1/2018-may-june-9702-13/