# 9702/11 October/November 2020

> 9702/11 October/November 2020: 40 questions, 40 marks. Difficulty 0.38, deviation 0.16, algebraic 0.26, text density 0.36. CIE IAL Physics 9702 P1.

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CIE IAL · Physics · 2020 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=006aa764-a014-4746-b916-36b0ce54022b)
- [All 9702 P1 papers](https://www.examsci.com/past-papers/cie-ial/physics/9702-paper-1/)

Core finding

**9702/11 October/November 2020 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 0.38 on a 0.20–0.75 scale, with a Difficulty Deviation of 0.16 and a mark split of 35.0% Easy, 57.5% Medium and 7.5% Hard. Algebraic complexity averages 0.26; 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**: 0.38 — 0.20–0.75 · nearer Medium
- **Difficulty Deviation**: 0.16 — 0 = uniform; higher = more mixed
- **Difficulty Ratio**: 35.0 / 57.5 / 7.5 — % Easy / Medium / Hard
- **Algebraic Complexity Measure**: 0.26 — 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** | 0.38 | Σ(d_i × w_i) / Σw_i, with d = 0.20 / 0.45 / 0.75 |
| **Difficulty Deviation** | 0.16 | √(Σw_i(d_i − μ)^2 / Σw_i) |
| **Difficulty Ratio** | 35.0% Easy / 57.5% Medium / 7.5% Hard | marks in band / all tagged marks |
| **Algebraic Complexity Measure** | 0.26 | 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=006aa764-a014-4746-b916-36b0ce54022b&question_id=c783c3c5-7ff4-484d-ae1b-58c7d3d7ea40&source_detail=9702%2F11+October%2FNovember+2020) |
| **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=006aa764-a014-4746-b916-36b0ce54022b&question_id=a3028e7f-eee2-4d31-b1e5-28ac1e119369&source_detail=9702%2F11+October%2FNovember+2020) |
| **Q3** FRQ | [1.4 Scalars and vectors](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/scalars-and-vectors/) | 1 | 0.45 Medium | 0.20 Low | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=006aa764-a014-4746-b916-36b0ce54022b&question_id=feb76369-f6f2-47c7-98eb-57a7c6a406cc&source_detail=9702%2F11+October%2FNovember+2020) |
| **Q4** FRQ | [2.1 Measurements](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=006aa764-a014-4746-b916-36b0ce54022b&question_id=e5fd1a2e-6733-4eae-a71a-4d85e2ae4940&source_detail=9702%2F11+October%2FNovember+2020) |
| **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=006aa764-a014-4746-b916-36b0ce54022b&question_id=76b0f777-15b5-4b14-8647-c511801a5177&source_detail=9702%2F11+October%2FNovember+2020) |
| **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 | 0.20 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=006aa764-a014-4746-b916-36b0ce54022b&question_id=f001b9b3-730a-45b7-817e-f7f96fa49a2b&source_detail=9702%2F11+October%2FNovember+2020) |
| **Q7** 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=006aa764-a014-4746-b916-36b0ce54022b&question_id=86467cfa-7da2-4bad-a152-29804def6f4f&source_detail=9702%2F11+October%2FNovember+2020) |
| **Q8** FRQ | [4.2 Non-uniform motion](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/non-uniform-motion/) | 1 | 0.45 Medium | 0.20 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=006aa764-a014-4746-b916-36b0ce54022b&question_id=6cacb83e-50e9-4025-b12e-8f7138baee72&source_detail=9702%2F11+October%2FNovember+2020) |
| **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 | 0.75 Hard | 0.45 Medium | 0.75 High | [Go to Practice Hub](https://www.examsci.com/practice?set_id=006aa764-a014-4746-b916-36b0ce54022b&question_id=b4bfffa5-9b3d-46d4-8241-2e97fe7d0160&source_detail=9702%2F11+October%2FNovember+2020) |
| **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 | 0.45 Medium | 0.45 Medium | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=006aa764-a014-4746-b916-36b0ce54022b&question_id=eb3f85df-8f5e-4046-a46b-9b4ca825fcfe&source_detail=9702%2F11+October%2FNovember+2020) |
| **Q11** 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=006aa764-a014-4746-b916-36b0ce54022b&question_id=2faa07f2-8657-4ac8-a0e7-053fd082f212&source_detail=9702%2F11+October%2FNovember+2020) |
| **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 | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=006aa764-a014-4746-b916-36b0ce54022b&question_id=fb56fecc-c81e-4473-ba29-75a23f8a9263&source_detail=9702%2F11+October%2FNovember+2020) |
| **Q13** FRQ | [5.3 Equilibrium of forces](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/equilibrium-of-forces/) | 1 | 0.45 Medium | 0.20 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=006aa764-a014-4746-b916-36b0ce54022b&question_id=7bc68ed3-9548-4503-bd2b-d69f1cfd5db7&source_detail=9702%2F11+October%2FNovember+2020) |
| **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=006aa764-a014-4746-b916-36b0ce54022b&question_id=6f3394c4-1782-435e-bae5-7b7f80f720a5&source_detail=9702%2F11+October%2FNovember+2020) |
| **Q15** 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=006aa764-a014-4746-b916-36b0ce54022b&question_id=4cc5eda6-e61f-4fb4-9558-05b01469537f&source_detail=9702%2F11+October%2FNovember+2020) |
| **Q16** FRQ | [6.2 Work and efficiency](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=006aa764-a014-4746-b916-36b0ce54022b&question_id=b649634d-0e1e-4e88-802e-6188aa3c9b56&source_detail=9702%2F11+October%2FNovember+2020) |
| **Q17** FRQ | [6.2 Work and efficiency](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=006aa764-a014-4746-b916-36b0ce54022b&question_id=ef662024-3d45-43f0-ab02-9ff4f835c8c8&source_detail=9702%2F11+October%2FNovember+2020) |
| **Q18** 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 | 0.20 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=006aa764-a014-4746-b916-36b0ce54022b&question_id=26c52467-4f17-49fc-8708-1650f5aa4a6c&source_detail=9702%2F11+October%2FNovember+2020) |
| **Q19** 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=006aa764-a014-4746-b916-36b0ce54022b&question_id=ff424048-13cc-472d-862f-085d85706464&source_detail=9702%2F11+October%2FNovember+2020) |
| **Q20** 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=006aa764-a014-4746-b916-36b0ce54022b&question_id=e8a3259f-5c71-4372-86d5-ef75ac3aa398&source_detail=9702%2F11+October%2FNovember+2020) |
| **Q21** 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=006aa764-a014-4746-b916-36b0ce54022b&question_id=746802d2-3324-404a-a2a5-e9b075d16d9f&source_detail=9702%2F11+October%2FNovember+2020) |
| **Q22** 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 | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=006aa764-a014-4746-b916-36b0ce54022b&question_id=1a2d4a9b-b62c-4895-9938-72254a046eb9&source_detail=9702%2F11+October%2FNovember+2020) |
| **Q23** FRQ | [14.3 Determination of frequency and wavelength of sound waves](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=006aa764-a014-4746-b916-36b0ce54022b&question_id=035fee9c-75ea-4bf7-bf55-24a3d342fa1b&source_detail=9702%2F11+October%2FNovember+2020) |
| **Q24** FRQ | [14.4 Doppler effect](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/) | 1 | 0.45 Medium | 0.45 Medium | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=006aa764-a014-4746-b916-36b0ce54022b&question_id=9655d9e2-54ff-4bb4-9eff-245d3c17a333&source_detail=9702%2F11+October%2FNovember+2020) |
| **Q25** FRQ | [14.5 Electromagnetic spectrum](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/electromagnetic-spectrum/) | 1 | 0.45 Medium | 0.20 Low | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=006aa764-a014-4746-b916-36b0ce54022b&question_id=85294684-233e-45d8-a6e4-45883e5d6848&source_detail=9702%2F11+October%2FNovember+2020) |
| **Q26** FRQ | [15.1 Stationary waves](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/stationary-waves/) | 1 | 0.20 Easy | 0.20 Low | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=006aa764-a014-4746-b916-36b0ce54022b&question_id=abae617b-4ad0-4a87-9783-fe569f60c48a&source_detail=9702%2F11+October%2FNovember+2020) |
| **Q27** 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=006aa764-a014-4746-b916-36b0ce54022b&question_id=f150b131-739b-4961-b964-654263959fb6&source_detail=9702%2F11+October%2FNovember+2020) |
| **Q28** 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=006aa764-a014-4746-b916-36b0ce54022b&question_id=170505ac-3a10-4878-8714-2b1226d11973&source_detail=9702%2F11+October%2FNovember+2020) |
| **Q29** FRQ | [15.4 Diffraction gratings](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/) | 1 | 0.45 Medium | 0.20 Low | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=006aa764-a014-4746-b916-36b0ce54022b&question_id=df4df806-e170-4463-9f2a-298c6e60335e&source_detail=9702%2F11+October%2FNovember+2020) |
| **Q30** FRQ | [17.1 Concept of an electric field](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/) | 1 | 0.45 Medium | 0.20 Low | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=006aa764-a014-4746-b916-36b0ce54022b&question_id=c23b5806-2c06-4177-9e9a-5a77ba84f7ea&source_detail=9702%2F11+October%2FNovember+2020) |
| **Q31** 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=006aa764-a014-4746-b916-36b0ce54022b&question_id=996c8dc7-d14c-4cac-be05-c188f0d20dff&source_detail=9702%2F11+October%2FNovember+2020) |
| **Q32** 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=006aa764-a014-4746-b916-36b0ce54022b&question_id=bb821609-2dbb-4d93-877d-9d6ba6a1579e&source_detail=9702%2F11+October%2FNovember+2020) |
| **Q33** FRQ | [19.2 Potential difference and power](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/potential-difference-and-power/) | 1 | 0.20 Easy | 0.20 Low | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=006aa764-a014-4746-b916-36b0ce54022b&question_id=b38bc03b-93b2-4bdd-892a-50aa7a830f8c&source_detail=9702%2F11+October%2FNovember+2020) |
| **Q34** FRQ | [19.3 Resistance and resistivity](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/resistance-and-resistivity/) | 1 | 0.75 Hard | 0.45 Medium | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=006aa764-a014-4746-b916-36b0ce54022b&question_id=1dda92a3-71e6-4273-a997-fbb4b16878ba&source_detail=9702%2F11+October%2FNovember+2020) |
| **Q35** FRQ | [20.3 Potential dividers](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/potential-dividers/) | 1 | 0.75 Hard | 0.20 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=006aa764-a014-4746-b916-36b0ce54022b&question_id=0e22bb11-cf7e-48fd-b45c-1ebe0330135a&source_detail=9702%2F11+October%2FNovember+2020) |
| **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 | 0.20 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=006aa764-a014-4746-b916-36b0ce54022b&question_id=bf3c9a49-f835-4bb2-b743-a251f0530598&source_detail=9702%2F11+October%2FNovember+2020) |
| **Q37** 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=006aa764-a014-4746-b916-36b0ce54022b&question_id=70cb64a0-feda-4833-943a-06c17595fec8&source_detail=9702%2F11+October%2FNovember+2020) |
| **Q38** 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=006aa764-a014-4746-b916-36b0ce54022b&question_id=1d504495-2c39-452f-9d76-7949444d8f88&source_detail=9702%2F11+October%2FNovember+2020) |
| **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=006aa764-a014-4746-b916-36b0ce54022b&question_id=7300c8d0-9f2b-445d-80ef-4ced862a99c3&source_detail=9702%2F11+October%2FNovember+2020) |
| **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=006aa764-a014-4746-b916-36b0ce54022b&question_id=963f1145-11ef-4938-8ad8-6eb60695816e&source_detail=9702%2F11+October%2FNovember+2020) |

## Topics in this paper

- [1.1 Physical quantities](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/physical-quantities/)
- [1.2 SI units](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/si-units/)
- [1.4 Scalars and vectors](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/scalars-and-vectors/)
- [2.1 Measurements](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/)
- [14.3 Determination of frequency and wavelength of sound waves](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/)
- [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/)
- [6.3 Potential energy and kinetic energy](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/)
- [4.3 Linear momentum and its conservation](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/linear-momentum-and-its-conservation/)
- [17.1 Concept of an electric field](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/)
- [17.2 Uniform electric fields](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 0.38 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 0.16, 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 35.0% Easy, 57.5% Medium and 7.5% 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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