# 9702/12 October/November 2018

> 9702/12 October/November 2018: 40 questions, 40 marks. Difficulty 0.31, deviation 0.12, algebraic 0.24, text density 0.35. CIE IAL Physics 9702 P1.

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CIE IAL · Physics · 2018 October/November

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=4300f1e4-aeee-45e4-a386-dcf0b8139fe8)
- [All 9702 P1 papers](https://www.examsci.com/past-papers/cie-ial/physics/9702-paper-1/)

Core finding

**9702/12 October/November 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 0.24; text density and modelling average 0.35. 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**: 0.24 — 0.20–0.75 · nearer Low
- **Text Density and Modelling Measure**: 0.35 — 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** | 0.24 | Σ(c_i × marks_i) / Σmarks_i, with c = 0.20 / 0.45 / 0.75 |
| **Text Density and Modelling Measure** | 0.35 | 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 | 0.45 Medium | 0.20 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=4300f1e4-aeee-45e4-a386-dcf0b8139fe8&question_id=05b1042e-49c1-476d-910a-a4877a264b2e&source_detail=9702%2F12+October%2FNovember+2018) |
| **Q2** FRQ | [1.2 SI units](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/si-units/) | 1 | 0.20 Easy | 0.20 Low | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=4300f1e4-aeee-45e4-a386-dcf0b8139fe8&question_id=e8df62fa-3bc8-45ab-8568-c8aafde943c9&source_detail=9702%2F12+October%2FNovember+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=4300f1e4-aeee-45e4-a386-dcf0b8139fe8&question_id=5358f971-3ad2-4370-822e-b5a99664cbf3&source_detail=9702%2F12+October%2FNovember+2018) |
| **Q4** 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=4300f1e4-aeee-45e4-a386-dcf0b8139fe8&question_id=23e59874-7317-49a2-aec0-31b82e80b7c9&source_detail=9702%2F12+October%2FNovember+2018) |
| **Q5** 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=4300f1e4-aeee-45e4-a386-dcf0b8139fe8&question_id=d9853344-d5b2-4abc-b34d-6edc84eac655&source_detail=9702%2F12+October%2FNovember+2018) |
| **Q6** FRQ | [3.1 Equations of motion](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/equations-of-motion/) | 1 | 0.45 Medium | 0.45 Medium | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=4300f1e4-aeee-45e4-a386-dcf0b8139fe8&question_id=f37625b4-4d52-4bef-876e-b3c20230fa6c&source_detail=9702%2F12+October%2FNovember+2018) |
| **Q7** 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 | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=4300f1e4-aeee-45e4-a386-dcf0b8139fe8&question_id=ba427480-c487-4229-8c9f-22fd9b675b43&source_detail=9702%2F12+October%2FNovember+2018) |
| **Q8** FRQ | [4.2 Non-uniform motion](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/non-uniform-motion/) | 1 | 0.20 Easy | 0.20 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=4300f1e4-aeee-45e4-a386-dcf0b8139fe8&question_id=789bf5c7-cf21-468f-8948-00477303daea&source_detail=9702%2F12+October%2FNovember+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 | 0.20 Easy | 0.20 Low | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=4300f1e4-aeee-45e4-a386-dcf0b8139fe8&question_id=3ab72ce6-91db-4b9f-86bb-dcd88790214f&source_detail=9702%2F12+October%2FNovember+2018) |
| **Q10** 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 | 0.20 Easy | 0.20 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=4300f1e4-aeee-45e4-a386-dcf0b8139fe8&question_id=b06f43f7-92d9-4057-a072-7f4ebe06bdda&source_detail=9702%2F12+October%2FNovember+2018) |
| **Q11** FRQ | [17.2 Uniform electric fields](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=4300f1e4-aeee-45e4-a386-dcf0b8139fe8&question_id=8dfe3219-ee5d-441f-a98d-d1919ad9209e&source_detail=9702%2F12+October%2FNovember+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 | 0.45 Medium | 0.45 Medium | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=4300f1e4-aeee-45e4-a386-dcf0b8139fe8&question_id=0178b7f8-b963-45f1-8181-9b51137dd43e&source_detail=9702%2F12+October%2FNovember+2018) |
| **Q13** FRQ | [5.3 Equilibrium of forces](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/equilibrium-of-forces/) | 1 | 0.20 Easy | 0.20 Low | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=4300f1e4-aeee-45e4-a386-dcf0b8139fe8&question_id=002d5b52-5cf0-46b1-87c1-5050aa234add&source_detail=9702%2F12+October%2FNovember+2018) |
| **Q14** FRQ | [5.4 Density and pressure](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/density-and-pressure/) | 1 | 0.45 Medium | 0.20 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=4300f1e4-aeee-45e4-a386-dcf0b8139fe8&question_id=4a449019-6db5-48a6-8d5e-2d737a827c32&source_detail=9702%2F12+October%2FNovember+2018) |
| **Q15** FRQ | [6.1 Energy conversion and conservation](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/) | 1 | 0.45 Medium | 0.20 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=4300f1e4-aeee-45e4-a386-dcf0b8139fe8&question_id=d4b7f6ba-638b-4ddd-96ac-b9e20e0953f9&source_detail=9702%2F12+October%2FNovember+2018) |
| **Q16** FRQ | [6.2 Work and efficiency](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/) | 1 | 0.20 Easy | 0.20 Low | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=4300f1e4-aeee-45e4-a386-dcf0b8139fe8&question_id=11330410-7397-47be-987b-78d8baecb1d5&source_detail=9702%2F12+October%2FNovember+2018) |
| **Q17** FRQ | [6.3 Potential energy and kinetic energy](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=4300f1e4-aeee-45e4-a386-dcf0b8139fe8&question_id=d880a1de-e66c-40b6-a0bc-96890347ae67&source_detail=9702%2F12+October%2FNovember+2018) |
| **Q18** FRQ | [6.3 Potential energy and kinetic energy](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=4300f1e4-aeee-45e4-a386-dcf0b8139fe8&question_id=a463690d-2827-497e-bb6f-e92575d677a0&source_detail=9702%2F12+October%2FNovember+2018) |
| **Q19** FRQ | [6.4 Power](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=4300f1e4-aeee-45e4-a386-dcf0b8139fe8&question_id=da3fb4c6-c178-4229-987b-8c192b6f4aea&source_detail=9702%2F12+October%2FNovember+2018) |
| **Q20** FRQ | [9.1 Stress and strain](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/stress-and-strain/) | 1 | 0.45 Medium | 0.20 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=4300f1e4-aeee-45e4-a386-dcf0b8139fe8&question_id=b7a853c0-797f-4482-9fbc-cf070724cd16&source_detail=9702%2F12+October%2FNovember+2018) |
| **Q21** FRQ | [9.2 Elastic and plastic behaviour](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/elastic-and-plastic-behaviour/) | 1 | 0.45 Medium | 0.20 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=4300f1e4-aeee-45e4-a386-dcf0b8139fe8&question_id=fef51dda-57fc-4597-87fe-3c9b1a704803&source_detail=9702%2F12+October%2FNovember+2018) |
| **Q22** 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=4300f1e4-aeee-45e4-a386-dcf0b8139fe8&question_id=9a2d9b15-03c4-4b89-b616-80b33bbae781&source_detail=9702%2F12+October%2FNovember+2018) |
| **Q23** FRQ | [14.1 Progressive waves](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/progressive-waves/) | 1 | 0.20 Easy | 0.20 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=4300f1e4-aeee-45e4-a386-dcf0b8139fe8&question_id=e451208e-2419-4671-a98b-4392c32aa0e9&source_detail=9702%2F12+October%2FNovember+2018) |
| **Q24** FRQ | [15.1 Stationary waves](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/stationary-waves/) | 1 | 0.45 Medium | 0.20 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=4300f1e4-aeee-45e4-a386-dcf0b8139fe8&question_id=1e42aed7-eefd-4f33-9aca-7100d0bca89f&source_detail=9702%2F12+October%2FNovember+2018) |
| **Q25** FRQ | [14.4 Doppler effect](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=4300f1e4-aeee-45e4-a386-dcf0b8139fe8&question_id=c66a1724-a658-43b8-bb26-5d7717b44c93&source_detail=9702%2F12+October%2FNovember+2018) |
| **Q26** 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 | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=4300f1e4-aeee-45e4-a386-dcf0b8139fe8&question_id=9238555d-7056-468a-b67b-f5551c058f8f&source_detail=9702%2F12+October%2FNovember+2018) |
| **Q27** FRQ | [15.1 Stationary waves](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/stationary-waves/) | 1 | 0.45 Medium | 0.20 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=4300f1e4-aeee-45e4-a386-dcf0b8139fe8&question_id=f847d3cc-ddc3-4e41-9162-e6db83e25e0b&source_detail=9702%2F12+October%2FNovember+2018) |
| **Q28** 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=4300f1e4-aeee-45e4-a386-dcf0b8139fe8&question_id=4f68c391-d842-432a-b531-9760508fd6fc&source_detail=9702%2F12+October%2FNovember+2018) |
| **Q29** FRQ | [15.3 Interference, two-source interference](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/) | 1 | 0.45 Medium | 0.20 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=4300f1e4-aeee-45e4-a386-dcf0b8139fe8&question_id=246aabd0-0432-4c1a-8ba3-f3772702ae76&source_detail=9702%2F12+October%2FNovember+2018) |
| **Q30** FRQ | [15.4 Diffraction gratings](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=4300f1e4-aeee-45e4-a386-dcf0b8139fe8&question_id=a52fc5a6-13d3-4421-9013-2e016d156885&source_detail=9702%2F12+October%2FNovember+2018) |
| **Q31** FRQ | [17.1 Concept of an electric field](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=4300f1e4-aeee-45e4-a386-dcf0b8139fe8&question_id=87d321f4-90f0-4c1e-b9e3-994eb8ce625d&source_detail=9702%2F12+October%2FNovember+2018) |
| **Q32** FRQ | [17.2 Uniform electric fields](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/) | 1 | 0.45 Medium | 0.20 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=4300f1e4-aeee-45e4-a386-dcf0b8139fe8&question_id=7886e036-3274-464b-9927-cd7e1a88d139&source_detail=9702%2F12+October%2FNovember+2018) |
| **Q33** 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=4300f1e4-aeee-45e4-a386-dcf0b8139fe8&question_id=29a0cf75-0ec3-445f-abac-73a913a32876&source_detail=9702%2F12+October%2FNovember+2018) |
| **Q34** FRQ | [19.2 Potential difference and power](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/potential-difference-and-power/) | 1 | 0.45 Medium | 0.45 Medium | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=4300f1e4-aeee-45e4-a386-dcf0b8139fe8&question_id=53357bb4-cd38-4daf-9a04-32e19cf66b96&source_detail=9702%2F12+October%2FNovember+2018) |
| **Q35** 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 | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=4300f1e4-aeee-45e4-a386-dcf0b8139fe8&question_id=84f325bf-69da-4ca0-8fd3-f5aabc0ddc73&source_detail=9702%2F12+October%2FNovember+2018) |
| **Q36** 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=4300f1e4-aeee-45e4-a386-dcf0b8139fe8&question_id=5c436d01-22d3-4575-89b9-e85d07c0a7bf&source_detail=9702%2F12+October%2FNovember+2018) |
| **Q37** FRQ | [20.2 Kirchhoff’s laws](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/kirchhoff-s-laws/) | 1 | 0.20 Easy | 0.20 Low | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=4300f1e4-aeee-45e4-a386-dcf0b8139fe8&question_id=a25f2d03-1066-4113-9bd8-58eeb418eda3&source_detail=9702%2F12+October%2FNovember+2018) |
| **Q38** FRQ | [20.3 Potential dividers](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/potential-dividers/) | 1 | 0.45 Medium | 0.20 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=4300f1e4-aeee-45e4-a386-dcf0b8139fe8&question_id=baf682ca-7376-43d9-868a-29b4ecea7561&source_detail=9702%2F12+October%2FNovember+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=4300f1e4-aeee-45e4-a386-dcf0b8139fe8&question_id=4ae185c8-0b9f-4547-baf5-ba9ae669589b&source_detail=9702%2F12+October%2FNovember+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=4300f1e4-aeee-45e4-a386-dcf0b8139fe8&question_id=b346d7f2-9d5b-4bdb-abb3-a88bb34a221a&source_detail=9702%2F12+October%2FNovember+2018) |

## Topics in this paper

- [1.1 Physical quantities](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/physical-quantities/)
- [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/)
- [6.3 Potential energy and kinetic energy](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/)
- [1.2 SI units](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/si-units/)
- [19.3 Resistance and resistivity](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/resistance-and-resistivity/)
- [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/)
- [3.1 Equations of motion](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/equations-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/)
- [17.2 Uniform electric fields](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/)
- [5.2 Turning effects of forces](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/turning-effects-of-forces/)

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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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