# 9702/12 October/November 2019

> 9702/12 October/November 2019: 40 questions, 40 marks. Difficulty 0.32, deviation 0.15, algebraic 0.26, text density 0.39. CIE IAL Physics 9702 P1.

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CIE IAL · Physics · 2019 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=c0d89c3a-afbe-4e68-b0a0-c98fa4c369e5)
- [All 9702 P1 papers](https://www.examsci.com/past-papers/cie-ial/physics/9702-paper-1/)

Core finding

**9702/12 October/November 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 0.32 on a 0.20–0.75 scale, with a Difficulty Deviation of 0.15 and a mark split of 57.5% Easy, 37.5% Medium and 5.0% Hard. Algebraic complexity averages 0.26; text density and modelling average 0.39. 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**: 0.32 — 0.20–0.75 · nearer Easy
- **Difficulty Deviation**: 0.15 — 0 = uniform; higher = more mixed
- **Difficulty Ratio**: 57.5 / 37.5 / 5.0 — % Easy / Medium / Hard
- **Algebraic Complexity Measure**: 0.26 — 0.20–0.75 · nearer Low
- **Text Density and Modelling Measure**: 0.39 — 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** | 0.32 | Σ(d_i × w_i) / Σw_i, with d = 0.20 / 0.45 / 0.75 |
| **Difficulty Deviation** | 0.15 | √(Σw_i(d_i − μ)^2 / Σw_i) |
| **Difficulty Ratio** | 57.5% Easy / 37.5% Medium / 5.0% 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** | 0.39 | 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=c0d89c3a-afbe-4e68-b0a0-c98fa4c369e5&question_id=dc86095d-c0cf-4e88-a230-48dfce2d7094&source_detail=9702%2F12+October%2FNovember+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=c0d89c3a-afbe-4e68-b0a0-c98fa4c369e5&question_id=5832702c-a92b-4574-8181-6dce6b955dd6&source_detail=9702%2F12+October%2FNovember+2019) |
| **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=c0d89c3a-afbe-4e68-b0a0-c98fa4c369e5&question_id=e61e3574-e63d-4f1b-bbfe-6f50bd1ca5f2&source_detail=9702%2F12+October%2FNovember+2019) |
| **Q4** 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 | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=c0d89c3a-afbe-4e68-b0a0-c98fa4c369e5&question_id=3f71e228-806c-4ce1-aa9f-973f4289b48d&source_detail=9702%2F12+October%2FNovember+2019) |
| **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=c0d89c3a-afbe-4e68-b0a0-c98fa4c369e5&question_id=1e5f1e63-88ab-4f2a-b298-2f517839cf66&source_detail=9702%2F12+October%2FNovember+2019) |
| **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=c0d89c3a-afbe-4e68-b0a0-c98fa4c369e5&question_id=37d88da3-6306-4da6-be17-12a6ba05d982&source_detail=9702%2F12+October%2FNovember+2019) |
| **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 | 0.20 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=c0d89c3a-afbe-4e68-b0a0-c98fa4c369e5&question_id=01099418-f609-4ceb-bca4-f26e0b10e24d&source_detail=9702%2F12+October%2FNovember+2019) |
| **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=c0d89c3a-afbe-4e68-b0a0-c98fa4c369e5&question_id=1d4f35db-c8bd-4ef0-aa9f-2f0953fd8ded&source_detail=9702%2F12+October%2FNovember+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 | 0.20 Easy | 0.20 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=c0d89c3a-afbe-4e68-b0a0-c98fa4c369e5&question_id=dfc2e171-926f-4be7-b26c-d5192284316f&source_detail=9702%2F12+October%2FNovember+2019) |
| **Q10** FRQ | [5.1 Types of force](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/) | 1 | 0.75 Hard | 0.45 Medium | 0.75 High | [Go to Practice Hub](https://www.examsci.com/practice?set_id=c0d89c3a-afbe-4e68-b0a0-c98fa4c369e5&question_id=392a9a15-7f27-47d2-b501-407b3325cfdb&source_detail=9702%2F12+October%2FNovember+2019) |
| **Q11** 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 | 0.20 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=c0d89c3a-afbe-4e68-b0a0-c98fa4c369e5&question_id=a66f6f9d-9d5f-4084-9d33-744aa5722b56&source_detail=9702%2F12+October%2FNovember+2019) |
| **Q12** 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=c0d89c3a-afbe-4e68-b0a0-c98fa4c369e5&question_id=23a79b26-8d2c-4b71-940e-471c93ff9554&source_detail=9702%2F12+October%2FNovember+2019) |
| **Q13** 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=c0d89c3a-afbe-4e68-b0a0-c98fa4c369e5&question_id=5f67b8ed-79d6-4379-9ef0-b7ec73b4cde8&source_detail=9702%2F12+October%2FNovember+2019) |
| **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=c0d89c3a-afbe-4e68-b0a0-c98fa4c369e5&question_id=5964c0bb-de50-4789-88b3-5fd8bd3547d6&source_detail=9702%2F12+October%2FNovember+2019) |
| **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 | 0.75 High | [Go to Practice Hub](https://www.examsci.com/practice?set_id=c0d89c3a-afbe-4e68-b0a0-c98fa4c369e5&question_id=0ccd00ff-4a8e-4e8f-8ce6-e246fd225234&source_detail=9702%2F12+October%2FNovember+2019) |
| **Q16** FRQ | [5.1 Types of force](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=c0d89c3a-afbe-4e68-b0a0-c98fa4c369e5&question_id=b7e901f2-907c-457c-9a74-6a428b7903b9&source_detail=9702%2F12+October%2FNovember+2019) |
| **Q17** FRQ | [6.4 Power](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=c0d89c3a-afbe-4e68-b0a0-c98fa4c369e5&question_id=e4ecfc9d-8d19-4c64-bb94-8d6a91eca193&source_detail=9702%2F12+October%2FNovember+2019) |
| **Q18** 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=c0d89c3a-afbe-4e68-b0a0-c98fa4c369e5&question_id=c63df71f-7218-4f5d-a392-d63f93cace8f&source_detail=9702%2F12+October%2FNovember+2019) |
| **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 | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=c0d89c3a-afbe-4e68-b0a0-c98fa4c369e5&question_id=a38dd79e-9793-474e-aa30-f37305aa9130&source_detail=9702%2F12+October%2FNovember+2019) |
| **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=c0d89c3a-afbe-4e68-b0a0-c98fa4c369e5&question_id=3abdbb09-c20f-4427-b4fa-7a2e0928a69f&source_detail=9702%2F12+October%2FNovember+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 | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=c0d89c3a-afbe-4e68-b0a0-c98fa4c369e5&question_id=bb470251-d77f-4a98-8d69-1c871fe5bf3c&source_detail=9702%2F12+October%2FNovember+2019) |
| **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 | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=c0d89c3a-afbe-4e68-b0a0-c98fa4c369e5&question_id=f2f012f9-c634-49ac-9bd8-afbb6a47a3b5&source_detail=9702%2F12+October%2FNovember+2019) |
| **Q23** 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=c0d89c3a-afbe-4e68-b0a0-c98fa4c369e5&question_id=a8c30a5e-b97c-40bf-b7aa-a4d1d3c74f4c&source_detail=9702%2F12+October%2FNovember+2019) |
| **Q24** 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=c0d89c3a-afbe-4e68-b0a0-c98fa4c369e5&question_id=a318724e-181e-43e8-84ba-27d0bf2aa52a&source_detail=9702%2F12+October%2FNovember+2019) |
| **Q25** 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=c0d89c3a-afbe-4e68-b0a0-c98fa4c369e5&question_id=0f4ac8a6-4c5d-4d1e-88f0-e1a1d59e94de&source_detail=9702%2F12+October%2FNovember+2019) |
| **Q26** 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=c0d89c3a-afbe-4e68-b0a0-c98fa4c369e5&question_id=abd01e33-31e5-4fd9-9d4b-465843acd98c&source_detail=9702%2F12+October%2FNovember+2019) |
| **Q27** 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=c0d89c3a-afbe-4e68-b0a0-c98fa4c369e5&question_id=a21124dd-f746-4f7d-a32c-643459c232ff&source_detail=9702%2F12+October%2FNovember+2019) |
| **Q28** FRQ | [15.4 Diffraction gratings](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=c0d89c3a-afbe-4e68-b0a0-c98fa4c369e5&question_id=787c6576-3904-4cb1-8a7e-d76bb3a8cf78&source_detail=9702%2F12+October%2FNovember+2019) |
| **Q29** 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 | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=c0d89c3a-afbe-4e68-b0a0-c98fa4c369e5&question_id=6ee2fb06-1007-49f0-a234-fa5a9cd97092&source_detail=9702%2F12+October%2FNovember+2019) |
| **Q30** 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=c0d89c3a-afbe-4e68-b0a0-c98fa4c369e5&question_id=cffbdd6f-e13d-4e41-af95-6239aa2cd129&source_detail=9702%2F12+October%2FNovember+2019) |
| **Q31** 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=c0d89c3a-afbe-4e68-b0a0-c98fa4c369e5&question_id=d47ce14b-3d90-4786-afc4-5a467431d0d3&source_detail=9702%2F12+October%2FNovember+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=c0d89c3a-afbe-4e68-b0a0-c98fa4c369e5&question_id=4982e09b-adfd-4f90-981b-86fec81df8ec&source_detail=9702%2F12+October%2FNovember+2019) |
| **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=c0d89c3a-afbe-4e68-b0a0-c98fa4c369e5&question_id=78da0dfa-bdf7-4a18-b6e5-5317fa227f76&source_detail=9702%2F12+October%2FNovember+2019) |
| **Q34** FRQ | [20.1 Practical circuits](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/practical-circuits/) | 1 | 0.75 Hard | 0.75 High | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=c0d89c3a-afbe-4e68-b0a0-c98fa4c369e5&question_id=16bf6179-97ab-4732-8cf8-2a3ef24052b5&source_detail=9702%2F12+October%2FNovember+2019) |
| **Q35** 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=c0d89c3a-afbe-4e68-b0a0-c98fa4c369e5&question_id=486f1107-a1b7-43f1-b4d8-3d5b9557dd17&source_detail=9702%2F12+October%2FNovember+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 | 0.45 Medium | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=c0d89c3a-afbe-4e68-b0a0-c98fa4c369e5&question_id=de335c42-4172-48fd-b2e0-bf027af4a42b&source_detail=9702%2F12+October%2FNovember+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=c0d89c3a-afbe-4e68-b0a0-c98fa4c369e5&question_id=cb00acd4-45c2-4ee7-acdd-34bf92e68d5e&source_detail=9702%2F12+October%2FNovember+2019) |
| **Q38** FRQ | [26.1 Atoms, nuclei and radiation](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/atoms-nuclei-and-radiation/) | 1 | 0.45 Medium | 0.20 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=c0d89c3a-afbe-4e68-b0a0-c98fa4c369e5&question_id=1d9f52c9-ba9a-4d37-81fc-6ae4d6ee5e26&source_detail=9702%2F12+October%2FNovember+2019) |
| **Q39** 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=c0d89c3a-afbe-4e68-b0a0-c98fa4c369e5&question_id=7ff2147a-8367-4adb-85ad-025ef8ea1ced&source_detail=9702%2F12+October%2FNovember+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=c0d89c3a-afbe-4e68-b0a0-c98fa4c369e5&question_id=89478380-8b32-4bf7-8370-1440ff5b38fa&source_detail=9702%2F12+October%2FNovember+2019) |

## 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/)
- [19.1 Electric current](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/electric-current/)
- [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/)
- [5.1 Types of force](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 0.32 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 0.15, 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, 37.5% Medium and 5.0% 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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