# 9702/11 May/June 2020

> 9702/11 May/June 2020: 40 questions, 40 marks. Difficulty 0.26, deviation 0.11, algebraic 0.25, text density 0.23. CIE IAL Physics 9702 P1.

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CIE IAL · Physics · 2020 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=b0e1408d-ba1a-4414-bd11-8349494d642b)
- [All 9702 P1 papers](https://www.examsci.com/past-papers/cie-ial/physics/9702-paper-1/)

Core finding

**9702/11 May/June 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 0.26 on a 0.20–0.75 scale, with a Difficulty Deviation of 0.11 and a mark split of 75.0% Easy, 25.0% Medium and 0.0% Hard. Algebraic complexity averages 0.25; text density and modelling average 0.23. 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**: 0.26 — 0.20–0.75 · nearer Easy
- **Difficulty Deviation**: 0.11 — 0 = uniform; higher = more mixed
- **Difficulty Ratio**: 75.0 / 25.0 / 0.0 — % Easy / Medium / Hard
- **Algebraic Complexity Measure**: 0.25 — 0.20–0.75 · nearer Low
- **Text Density and Modelling Measure**: 0.23 — 0.20–0.75 · nearer Low

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** | 0.26 | Σ(d_i × w_i) / Σw_i, with d = 0.20 / 0.45 / 0.75 |
| **Difficulty Deviation** | 0.11 | √(Σw_i(d_i − μ)^2 / Σw_i) |
| **Difficulty Ratio** | 75.0% Easy / 25.0% Medium / 0.0% Hard | marks in band / all tagged marks |
| **Algebraic Complexity Measure** | 0.25 | Σ(c_i × marks_i) / Σmarks_i, with c = 0.20 / 0.45 / 0.75 |
| **Text Density and Modelling Measure** | 0.23 | 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=b0e1408d-ba1a-4414-bd11-8349494d642b&question_id=a319d959-484c-49db-8bc2-da6c5341aaa6&source_detail=9702%2F11+May%2FJune+2020) |
| **Q2** FRQ | [1.2 SI units](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/si-units/) | 1 | 0.45 Medium | 0.45 Medium | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=b0e1408d-ba1a-4414-bd11-8349494d642b&question_id=28b2d552-ee31-4960-ae85-491dff300777&source_detail=9702%2F11+May%2FJune+2020) |
| **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=b0e1408d-ba1a-4414-bd11-8349494d642b&question_id=735e31d2-339d-495d-a2ec-d6c0ddf841b8&source_detail=9702%2F11+May%2FJune+2020) |
| **Q4** FRQ | [2.1 Measurements](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=b0e1408d-ba1a-4414-bd11-8349494d642b&question_id=e88638d4-b971-4eac-bbc8-4dc7501a5861&source_detail=9702%2F11+May%2FJune+2020) |
| **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=b0e1408d-ba1a-4414-bd11-8349494d642b&question_id=420a0f23-a747-45d2-a162-09bb05ba1a66&source_detail=9702%2F11+May%2FJune+2020) |
| **Q6** FRQ | [1.4 Scalars and vectors](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/scalars-and-vectors/) | 1 | 0.45 Medium | 0.45 Medium | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=b0e1408d-ba1a-4414-bd11-8349494d642b&question_id=d484826e-4e99-460e-a9f5-3f643da8e024&source_detail=9702%2F11+May%2FJune+2020) |
| **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=b0e1408d-ba1a-4414-bd11-8349494d642b&question_id=0f405b15-59fb-4175-b960-5710996a0eff&source_detail=9702%2F11+May%2FJune+2020) |
| **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 | 0.45 Medium | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=b0e1408d-ba1a-4414-bd11-8349494d642b&question_id=18b00669-ed7f-49b3-b810-666be136e8a2&source_detail=9702%2F11+May%2FJune+2020) |
| **Q9** 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 | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=b0e1408d-ba1a-4414-bd11-8349494d642b&question_id=708a7ef6-db4c-4326-bf30-d14a16c26a84&source_detail=9702%2F11+May%2FJune+2020) |
| **Q10** 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 | 0.20 Easy | 0.20 Low | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=b0e1408d-ba1a-4414-bd11-8349494d642b&question_id=090aa2bb-b16b-478b-920a-c1c96689bc6b&source_detail=9702%2F11+May%2FJune+2020) |
| **Q11** FRQ | [5.1 Types of force](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/) | 1 | 0.20 Easy | 0.20 Low | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=b0e1408d-ba1a-4414-bd11-8349494d642b&question_id=886de36a-7a71-400f-86e2-b52e3a7c7250&source_detail=9702%2F11+May%2FJune+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 | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=b0e1408d-ba1a-4414-bd11-8349494d642b&question_id=5028ce36-b4b9-4a48-9db6-548c962fa659&source_detail=9702%2F11+May%2FJune+2020) |
| **Q13** 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=b0e1408d-ba1a-4414-bd11-8349494d642b&question_id=246e39cf-7836-4788-a475-e2208e72d7a3&source_detail=9702%2F11+May%2FJune+2020) |
| **Q14** 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=b0e1408d-ba1a-4414-bd11-8349494d642b&question_id=13cc613c-a534-4d4e-920f-00a95c2a151b&source_detail=9702%2F11+May%2FJune+2020) |
| **Q15** FRQ | [5.4 Density and pressure](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/density-and-pressure/) | 1 | 0.20 Easy | 0.20 Low | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=b0e1408d-ba1a-4414-bd11-8349494d642b&question_id=e0b8fdaf-c460-47c2-9bd7-9a171e59dc45&source_detail=9702%2F11+May%2FJune+2020) |
| **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 | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=b0e1408d-ba1a-4414-bd11-8349494d642b&question_id=5a37fa52-0ee0-4f3c-a2ed-5e90c88b67a9&source_detail=9702%2F11+May%2FJune+2020) |
| **Q17** 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=b0e1408d-ba1a-4414-bd11-8349494d642b&question_id=e63b6f00-6edd-4bc2-9508-278e893a3fa7&source_detail=9702%2F11+May%2FJune+2020) |
| **Q18** 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 | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=b0e1408d-ba1a-4414-bd11-8349494d642b&question_id=5c4df6b9-d567-4fb4-9ac2-89a10c1ebd5b&source_detail=9702%2F11+May%2FJune+2020) |
| **Q19** 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=b0e1408d-ba1a-4414-bd11-8349494d642b&question_id=918b223e-a7c3-4b57-b1a1-360078793e9b&source_detail=9702%2F11+May%2FJune+2020) |
| **Q20** FRQ | [9.1 Stress and strain](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/stress-and-strain/) | 1 | 0.20 Easy | 0.20 Low | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=b0e1408d-ba1a-4414-bd11-8349494d642b&question_id=ad150412-4acb-4d2c-ac2b-a05d1b435c41&source_detail=9702%2F11+May%2FJune+2020) |
| **Q21** FRQ | [9.2 Elastic and plastic behaviour](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/elastic-and-plastic-behaviour/) | 1 | 0.20 Easy | 0.20 Low | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=b0e1408d-ba1a-4414-bd11-8349494d642b&question_id=82be1a23-279c-45e4-9ad6-b6f40e5a5db2&source_detail=9702%2F11+May%2FJune+2020) |
| **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=b0e1408d-ba1a-4414-bd11-8349494d642b&question_id=9bf0d352-ef4e-442a-8523-a0fb11f69373&source_detail=9702%2F11+May%2FJune+2020) |
| **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 | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=b0e1408d-ba1a-4414-bd11-8349494d642b&question_id=feeb54f8-901f-4ca7-b422-4478202e2ea9&source_detail=9702%2F11+May%2FJune+2020) |
| **Q24** 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 | 0.45 Medium | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=b0e1408d-ba1a-4414-bd11-8349494d642b&question_id=10f57d64-db6c-430e-87a1-d72e8441b8ef&source_detail=9702%2F11+May%2FJune+2020) |
| **Q25** FRQ | [14.4 Doppler effect](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=b0e1408d-ba1a-4414-bd11-8349494d642b&question_id=76adb438-5823-44c0-8b62-a69484ef5f8d&source_detail=9702%2F11+May%2FJune+2020) |
| **Q26** FRQ | [14.5 Electromagnetic spectrum](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/electromagnetic-spectrum/) | 1 | 0.20 Easy | 0.20 Low | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=b0e1408d-ba1a-4414-bd11-8349494d642b&question_id=41f64dad-d29c-4bad-97b8-e37d3e490de5&source_detail=9702%2F11+May%2FJune+2020) |
| **Q27** 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=b0e1408d-ba1a-4414-bd11-8349494d642b&question_id=45e56dce-9d9d-4171-8d79-d174ad360d40&source_detail=9702%2F11+May%2FJune+2020) |
| **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=b0e1408d-ba1a-4414-bd11-8349494d642b&question_id=26b9ac67-9b5a-416e-b8b3-56cb9b8524f5&source_detail=9702%2F11+May%2FJune+2020) |
| **Q29** 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 | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=b0e1408d-ba1a-4414-bd11-8349494d642b&question_id=f36668c4-41c9-401a-9d92-bdfdd0cfae82&source_detail=9702%2F11+May%2FJune+2020) |
| **Q30** 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 | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=b0e1408d-ba1a-4414-bd11-8349494d642b&question_id=a1bf309e-e4b3-4487-a402-26d0c7420175&source_detail=9702%2F11+May%2FJune+2020) |
| **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=b0e1408d-ba1a-4414-bd11-8349494d642b&question_id=45e78b2b-3f4d-4bb7-b7e7-8c98cb204699&source_detail=9702%2F11+May%2FJune+2020) |
| **Q32** FRQ | [17.2 Uniform electric fields](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/) | 1 | 0.45 Medium | 0.45 Medium | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=b0e1408d-ba1a-4414-bd11-8349494d642b&question_id=5f0c2b53-ea9b-45d5-825b-66ef4fd0b78a&source_detail=9702%2F11+May%2FJune+2020) |
| **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=b0e1408d-ba1a-4414-bd11-8349494d642b&question_id=a06123ff-9154-40c6-ade1-d5642ccfce2f&source_detail=9702%2F11+May%2FJune+2020) |
| **Q34** 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=b0e1408d-ba1a-4414-bd11-8349494d642b&question_id=ef037b3f-5ad6-45b2-ae47-5a9b86c8d6af&source_detail=9702%2F11+May%2FJune+2020) |
| **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 | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=b0e1408d-ba1a-4414-bd11-8349494d642b&question_id=d729128f-9ce4-43c8-a3c4-2d0e982d4674&source_detail=9702%2F11+May%2FJune+2020) |
| **Q36** 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 | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=b0e1408d-ba1a-4414-bd11-8349494d642b&question_id=4b9ca1f5-754d-4026-a137-36d24f0fb8ff&source_detail=9702%2F11+May%2FJune+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 | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=b0e1408d-ba1a-4414-bd11-8349494d642b&question_id=270c0da4-d6cb-421a-990f-69beaeec0630&source_detail=9702%2F11+May%2FJune+2020) |
| **Q38** 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=b0e1408d-ba1a-4414-bd11-8349494d642b&question_id=8f6a726a-3fd4-4f8b-9244-2bcd439ed151&source_detail=9702%2F11+May%2FJune+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=b0e1408d-ba1a-4414-bd11-8349494d642b&question_id=cebaab29-9382-4e31-bc99-5d9008d4e9c2&source_detail=9702%2F11+May%2FJune+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=b0e1408d-ba1a-4414-bd11-8349494d642b&question_id=7e1fd784-0e8f-47fd-a31e-b28635979ea9&source_detail=9702%2F11+May%2FJune+2020) |

## Topics in this paper

- [1.1 Physical quantities](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/physical-quantities/)
- [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/)
- [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/)
- [4.1 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/)

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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 0.26 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 0.11, 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 75.0% Easy, 25.0% 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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