# 9702/13 May/June 2019

> 9702/13 May/June 2019: 40 questions, 40 marks. Difficulty 0.31, deviation 0.12, algebraic 0.25, text density 0.31. CIE IAL Physics 9702 P1.

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CIE IAL · Physics · 2019 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=f36262a8-0e1b-4518-9e6d-ccf77c12ae8e)
- [All 9702 P1 papers](https://www.examsci.com/past-papers/cie-ial/physics/9702-paper-1/)

Core finding

**9702/13 May/June 2019 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 55.0% Easy, 45.0% Medium and 0.0% Hard. Algebraic complexity averages 0.25; text density and modelling average 0.31. 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**: 55.0 / 45.0 / 0.0 — % Easy / Medium / Hard
- **Algebraic Complexity Measure**: 0.25 — 0.20–0.75 · nearer Low
- **Text Density and Modelling Measure**: 0.31 — 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** | 0.31 | 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** | 55.0% Easy / 45.0% 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** | 0.31 | 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 | [1.2 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=f36262a8-0e1b-4518-9e6d-ccf77c12ae8e&question_id=d9e00140-5765-4540-be68-96878a36bffb&source_detail=9702%2F13+May%2FJune+2019) |
| **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=f36262a8-0e1b-4518-9e6d-ccf77c12ae8e&question_id=00594582-179f-4512-8daf-9900e131ce36&source_detail=9702%2F13+May%2FJune+2019) |
| **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 | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=f36262a8-0e1b-4518-9e6d-ccf77c12ae8e&question_id=cd821ef4-bc8d-47cc-8453-a97f2e8d450a&source_detail=9702%2F13+May%2FJune+2019) |
| **Q4** 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=f36262a8-0e1b-4518-9e6d-ccf77c12ae8e&question_id=c6508293-5e82-4eb9-805f-ff7c7024f29d&source_detail=9702%2F13+May%2FJune+2019) |
| **Q5** 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=f36262a8-0e1b-4518-9e6d-ccf77c12ae8e&question_id=7ba44736-9ba6-4821-ad6f-69df3f11c86b&source_detail=9702%2F13+May%2FJune+2019) |
| **Q6** FRQ | [2.2 Errors and uncertainties](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/errors-and-uncertainties/) | 1 | 0.45 Medium | 0.20 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=f36262a8-0e1b-4518-9e6d-ccf77c12ae8e&question_id=1b289740-fcea-4988-9c12-7289aafd046b&source_detail=9702%2F13+May%2FJune+2019) |
| **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 | 0.20 Low | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=f36262a8-0e1b-4518-9e6d-ccf77c12ae8e&question_id=93722880-eba2-4c12-b05c-a571d29efa81&source_detail=9702%2F13+May%2FJune+2019) |
| **Q8** 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=f36262a8-0e1b-4518-9e6d-ccf77c12ae8e&question_id=29ef5f8a-596e-4a36-b3cd-6a75754c997d&source_detail=9702%2F13+May%2FJune+2019) |
| **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 | 0.20 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=f36262a8-0e1b-4518-9e6d-ccf77c12ae8e&question_id=00760374-e5ab-4c4b-8bce-36e16bb793e6&source_detail=9702%2F13+May%2FJune+2019) |
| **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=f36262a8-0e1b-4518-9e6d-ccf77c12ae8e&question_id=72b85e06-3c37-45f3-bd80-5d3ef6206670&source_detail=9702%2F13+May%2FJune+2019) |
| **Q11** 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 | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=f36262a8-0e1b-4518-9e6d-ccf77c12ae8e&question_id=ab36d9a4-b77f-49d9-bad1-f1e642ab1609&source_detail=9702%2F13+May%2FJune+2019) |
| **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=f36262a8-0e1b-4518-9e6d-ccf77c12ae8e&question_id=eb131c42-0379-42e8-9c47-507a61297bfd&source_detail=9702%2F13+May%2FJune+2019) |
| **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=f36262a8-0e1b-4518-9e6d-ccf77c12ae8e&question_id=1846a54f-f54d-4746-b25b-e8d27fd733a2&source_detail=9702%2F13+May%2FJune+2019) |
| **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 | 0.45 Medium | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=f36262a8-0e1b-4518-9e6d-ccf77c12ae8e&question_id=a6c90862-1c3d-4cd8-ab20-de855a45b410&source_detail=9702%2F13+May%2FJune+2019) |
| **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 | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=f36262a8-0e1b-4518-9e6d-ccf77c12ae8e&question_id=9b69e658-3cb0-4b7f-b9f7-7bf2d6e80679&source_detail=9702%2F13+May%2FJune+2019) |
| **Q16** 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=f36262a8-0e1b-4518-9e6d-ccf77c12ae8e&question_id=27814712-da2d-4a82-bb4a-21b9d2b55884&source_detail=9702%2F13+May%2FJune+2019) |
| **Q17** 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=f36262a8-0e1b-4518-9e6d-ccf77c12ae8e&question_id=c1f73f72-2b8a-42b9-8c6a-9c1168efe53c&source_detail=9702%2F13+May%2FJune+2019) |
| **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 | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=f36262a8-0e1b-4518-9e6d-ccf77c12ae8e&question_id=4aa6a39d-d7bc-4dab-96af-8caa292ad6dc&source_detail=9702%2F13+May%2FJune+2019) |
| **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=f36262a8-0e1b-4518-9e6d-ccf77c12ae8e&question_id=9db74b37-a644-4d0f-a0fa-3eefca1a7423&source_detail=9702%2F13+May%2FJune+2019) |
| **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=f36262a8-0e1b-4518-9e6d-ccf77c12ae8e&question_id=c5453f89-1ca2-4995-be8b-fd16e0c77689&source_detail=9702%2F13+May%2FJune+2019) |
| **Q21** 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=f36262a8-0e1b-4518-9e6d-ccf77c12ae8e&question_id=394ccb28-e43d-4896-94fa-4202ae8cdba9&source_detail=9702%2F13+May%2FJune+2019) |
| **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=f36262a8-0e1b-4518-9e6d-ccf77c12ae8e&question_id=8baad46f-bd50-422f-a45f-0f914aa15185&source_detail=9702%2F13+May%2FJune+2019) |
| **Q23** 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=f36262a8-0e1b-4518-9e6d-ccf77c12ae8e&question_id=6a4386f4-76d0-468c-bcf3-ffa36ffffce0&source_detail=9702%2F13+May%2FJune+2019) |
| **Q24** FRQ | [14.4 Doppler effect](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=f36262a8-0e1b-4518-9e6d-ccf77c12ae8e&question_id=308c4119-c1e4-49d4-a78e-ef9891fa8a84&source_detail=9702%2F13+May%2FJune+2019) |
| **Q25** 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=f36262a8-0e1b-4518-9e6d-ccf77c12ae8e&question_id=3afcf468-5142-43e8-b550-3e81ee1b8522&source_detail=9702%2F13+May%2FJune+2019) |
| **Q26** 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=f36262a8-0e1b-4518-9e6d-ccf77c12ae8e&question_id=65a7cacf-194f-4dd9-91f3-e0bbf6254300&source_detail=9702%2F13+May%2FJune+2019) |
| **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=f36262a8-0e1b-4518-9e6d-ccf77c12ae8e&question_id=77031869-7596-4f1e-b779-52396f87b6f4&source_detail=9702%2F13+May%2FJune+2019) |
| **Q28** 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=f36262a8-0e1b-4518-9e6d-ccf77c12ae8e&question_id=40c0bcf2-1d85-4c15-838b-d850a97e44e5&source_detail=9702%2F13+May%2FJune+2019) |
| **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=f36262a8-0e1b-4518-9e6d-ccf77c12ae8e&question_id=eede53df-0b80-404d-8bd3-c9023b3ebdd1&source_detail=9702%2F13+May%2FJune+2019) |
| **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=f36262a8-0e1b-4518-9e6d-ccf77c12ae8e&question_id=3c796a3b-4a88-46b4-a451-f278736450be&source_detail=9702%2F13+May%2FJune+2019) |
| **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=f36262a8-0e1b-4518-9e6d-ccf77c12ae8e&question_id=0cbfa3b4-0ac7-4da9-a17b-c638097e532b&source_detail=9702%2F13+May%2FJune+2019) |
| **Q32** 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=f36262a8-0e1b-4518-9e6d-ccf77c12ae8e&question_id=7dc7ac3e-3d02-4c1d-a822-fcf68a2c4dd4&source_detail=9702%2F13+May%2FJune+2019) |
| **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=f36262a8-0e1b-4518-9e6d-ccf77c12ae8e&question_id=dfabd7b8-d5e2-4914-8749-99c0e256267d&source_detail=9702%2F13+May%2FJune+2019) |
| **Q34** FRQ | [20.1 Practical circuits](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/practical-circuits/) | 1 | 0.45 Medium | 0.20 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=f36262a8-0e1b-4518-9e6d-ccf77c12ae8e&question_id=e4c5751e-d6ea-43fa-9afb-b3074588d67b&source_detail=9702%2F13+May%2FJune+2019) |
| **Q35** 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=f36262a8-0e1b-4518-9e6d-ccf77c12ae8e&question_id=71845f84-5f22-4ff4-a882-be81dcf601ce&source_detail=9702%2F13+May%2FJune+2019) |
| **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=f36262a8-0e1b-4518-9e6d-ccf77c12ae8e&question_id=8b957e57-8f5e-4587-8933-e7a1ae3604bc&source_detail=9702%2F13+May%2FJune+2019) |
| **Q37** 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=f36262a8-0e1b-4518-9e6d-ccf77c12ae8e&question_id=fd193757-7bf9-4677-b0ba-939aa1ecd62f&source_detail=9702%2F13+May%2FJune+2019) |
| **Q38** 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=f36262a8-0e1b-4518-9e6d-ccf77c12ae8e&question_id=03febc4a-bf47-43b8-b121-d85e6191a2b0&source_detail=9702%2F13+May%2FJune+2019) |
| **Q39** 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=f36262a8-0e1b-4518-9e6d-ccf77c12ae8e&question_id=8b57a29c-f965-46d2-9104-8885c88668a1&source_detail=9702%2F13+May%2FJune+2019) |
| **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=f36262a8-0e1b-4518-9e6d-ccf77c12ae8e&question_id=278812fc-ae75-4052-a806-954c7887fa3e&source_detail=9702%2F13+May%2FJune+2019) |

## Topics in this paper

- [1.2 SI units](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/si-units/)
- [5.4 Density and pressure](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/density-and-pressure/)
- [1.4 Scalars and vectors](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/scalars-and-vectors/)
- [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/)
- [2.1 Measurements](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/)
- [4.3 Linear momentum and its conservation](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/linear-momentum-and-its-conservation/)
- [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/)
- [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 0.31 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 55.0% Easy, 45.0% 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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