# 9702/12 May/June 2018

> 9702/12 May/June 2018: 40 questions, 40 marks. Difficulty 0.29, deviation 0.12, algebraic 0.23, text density 0.27. CIE IAL Physics 9702 P1.

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CIE IAL · Physics · 2018 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=d2d2f25a-4425-4e45-afd1-41e552c95466)
- [All 9702 P1 papers](https://www.examsci.com/past-papers/cie-ial/physics/9702-paper-1/)

Core finding

**9702/12 May/June 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 0.29 on a 0.20–0.75 scale, with a Difficulty Deviation of 0.12 and a mark split of 65.0% Easy, 35.0% Medium and 0.0% Hard. Algebraic complexity averages 0.23; text density and modelling average 0.27. 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**: 0.29 — 0.20–0.75 · nearer Easy
- **Difficulty Deviation**: 0.12 — 0 = uniform; higher = more mixed
- **Difficulty Ratio**: 65.0 / 35.0 / 0.0 — % Easy / Medium / Hard
- **Algebraic Complexity Measure**: 0.23 — 0.20–0.75 · nearer Low
- **Text Density and Modelling Measure**: 0.27 — 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** | 0.29 | 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** | 65.0% Easy / 35.0% Medium / 0.0% Hard | marks in band / all tagged marks |
| **Algebraic Complexity Measure** | 0.23 | Σ(c_i × marks_i) / Σmarks_i, with c = 0.20 / 0.45 / 0.75 |
| **Text Density and Modelling Measure** | 0.27 | 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=d2d2f25a-4425-4e45-afd1-41e552c95466&question_id=3cf27824-289c-4d0e-9c50-60b627ff7d01&source_detail=9702%2F12+May%2FJune+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=d2d2f25a-4425-4e45-afd1-41e552c95466&question_id=63567616-1291-419b-916f-769c0b644c74&source_detail=9702%2F12+May%2FJune+2018) |
| **Q3** 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 | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=d2d2f25a-4425-4e45-afd1-41e552c95466&question_id=5424c51b-317d-4b17-b0a3-f49d199de5eb&source_detail=9702%2F12+May%2FJune+2018) |
| **Q4** 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=d2d2f25a-4425-4e45-afd1-41e552c95466&question_id=64864893-2a9c-49e3-a8e0-da47e1f2cdad&source_detail=9702%2F12+May%2FJune+2018) |
| **Q5** 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=d2d2f25a-4425-4e45-afd1-41e552c95466&question_id=6b8e6b34-9273-4b56-ac42-e82b4a8a79d0&source_detail=9702%2F12+May%2FJune+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 | 0.20 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=d2d2f25a-4425-4e45-afd1-41e552c95466&question_id=4109ac3a-3603-4ee2-8bc5-81b6074fb4e0&source_detail=9702%2F12+May%2FJune+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=d2d2f25a-4425-4e45-afd1-41e552c95466&question_id=a68df328-5631-4562-811a-aeb6f82d5021&source_detail=9702%2F12+May%2FJune+2018) |
| **Q8** 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=d2d2f25a-4425-4e45-afd1-41e552c95466&question_id=ed154fce-cb3f-4194-85d3-a46d24c4ca02&source_detail=9702%2F12+May%2FJune+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 | 0.45 Medium | 0.45 Medium | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=d2d2f25a-4425-4e45-afd1-41e552c95466&question_id=c2255bbd-372f-46f8-ad9b-68a9a5adedd7&source_detail=9702%2F12+May%2FJune+2018) |
| **Q10** 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=d2d2f25a-4425-4e45-afd1-41e552c95466&question_id=1aa39085-bdee-4e19-b540-992ae92eb449&source_detail=9702%2F12+May%2FJune+2018) |
| **Q11** 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=d2d2f25a-4425-4e45-afd1-41e552c95466&question_id=cd7f0471-a188-4e81-a817-178f0528012e&source_detail=9702%2F12+May%2FJune+2018) |
| **Q12** 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=d2d2f25a-4425-4e45-afd1-41e552c95466&question_id=ee40a9b3-3008-4dcc-96bc-c140873d5677&source_detail=9702%2F12+May%2FJune+2018) |
| **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=d2d2f25a-4425-4e45-afd1-41e552c95466&question_id=5c6ebe15-8618-4e0e-855e-12324c2ec13c&source_detail=9702%2F12+May%2FJune+2018) |
| **Q14** 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=d2d2f25a-4425-4e45-afd1-41e552c95466&question_id=e5b0d12c-0142-4e8b-a40a-14fcfc09d992&source_detail=9702%2F12+May%2FJune+2018) |
| **Q15** 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=d2d2f25a-4425-4e45-afd1-41e552c95466&question_id=68de0e8a-3a97-4455-8e6c-3707384efe6a&source_detail=9702%2F12+May%2FJune+2018) |
| **Q16** FRQ | [6.2 Work and efficiency](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/) | 1 | 0.45 Medium | 0.45 Medium | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=d2d2f25a-4425-4e45-afd1-41e552c95466&question_id=4bf725a4-2dea-4c7e-b5af-5d231ca72c40&source_detail=9702%2F12+May%2FJune+2018) |
| **Q17** 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=d2d2f25a-4425-4e45-afd1-41e552c95466&question_id=b798bac1-a248-48bf-b276-1c1938bed0f0&source_detail=9702%2F12+May%2FJune+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 | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=d2d2f25a-4425-4e45-afd1-41e552c95466&question_id=6546627b-8115-4616-abaa-1754413fa10c&source_detail=9702%2F12+May%2FJune+2018) |
| **Q19** 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=d2d2f25a-4425-4e45-afd1-41e552c95466&question_id=afa51add-311b-437e-bec4-43b4e821ea27&source_detail=9702%2F12+May%2FJune+2018) |
| **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=d2d2f25a-4425-4e45-afd1-41e552c95466&question_id=af5c330b-0a55-441b-b342-0aad8a04354a&source_detail=9702%2F12+May%2FJune+2018) |
| **Q21** 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=d2d2f25a-4425-4e45-afd1-41e552c95466&question_id=c9a04e68-930d-4615-afca-f2ebce3a5277&source_detail=9702%2F12+May%2FJune+2018) |
| **Q22** 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=d2d2f25a-4425-4e45-afd1-41e552c95466&question_id=5be932ac-5ac9-4121-b8b7-74bdd1ab9512&source_detail=9702%2F12+May%2FJune+2018) |
| **Q23** FRQ | [14.3 Determination of frequency and wavelength of sound waves](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/) | 1 | 0.20 Easy | 0.20 Low | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=d2d2f25a-4425-4e45-afd1-41e552c95466&question_id=b5c2faa0-f92e-40d4-81aa-016e3782b0d5&source_detail=9702%2F12+May%2FJune+2018) |
| **Q24** 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=d2d2f25a-4425-4e45-afd1-41e552c95466&question_id=d44903aa-c375-48e2-ada9-a624e5122eb5&source_detail=9702%2F12+May%2FJune+2018) |
| **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=d2d2f25a-4425-4e45-afd1-41e552c95466&question_id=7d75b130-71f9-4bb1-a715-806dafffee94&source_detail=9702%2F12+May%2FJune+2018) |
| **Q26** 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=d2d2f25a-4425-4e45-afd1-41e552c95466&question_id=4f97c5ac-686a-43be-bced-c8dd402a7ba5&source_detail=9702%2F12+May%2FJune+2018) |
| **Q27** 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=d2d2f25a-4425-4e45-afd1-41e552c95466&question_id=600d2a88-0452-42c7-aece-b3cd97e54f9c&source_detail=9702%2F12+May%2FJune+2018) |
| **Q28** 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=d2d2f25a-4425-4e45-afd1-41e552c95466&question_id=5d00557a-ec05-47dc-b9b0-22288b55e6a3&source_detail=9702%2F12+May%2FJune+2018) |
| **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=d2d2f25a-4425-4e45-afd1-41e552c95466&question_id=b9811d50-7aa5-4e40-ba2c-7c67375c6bb8&source_detail=9702%2F12+May%2FJune+2018) |
| **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 | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=d2d2f25a-4425-4e45-afd1-41e552c95466&question_id=183f4fef-3b3c-4f0a-b6da-dae3ad21a9c4&source_detail=9702%2F12+May%2FJune+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=d2d2f25a-4425-4e45-afd1-41e552c95466&question_id=003b90d4-218b-4098-b7c1-38db29cf4d88&source_detail=9702%2F12+May%2FJune+2018) |
| **Q32** FRQ | [19.2 Potential difference and power](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/potential-difference-and-power/) | 1 | 0.45 Medium | 0.45 Medium | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=d2d2f25a-4425-4e45-afd1-41e552c95466&question_id=3f203063-51f4-450a-9d64-03aca59a9ceb&source_detail=9702%2F12+May%2FJune+2018) |
| **Q33** FRQ | [19.3 Resistance and resistivity](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/resistance-and-resistivity/) | 1 | 0.45 Medium | 0.20 Low | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=d2d2f25a-4425-4e45-afd1-41e552c95466&question_id=62b0f4be-621c-4c41-9268-be996aec3bb6&source_detail=9702%2F12+May%2FJune+2018) |
| **Q34** 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=d2d2f25a-4425-4e45-afd1-41e552c95466&question_id=5fced03c-97e8-4707-9700-756fd91895ef&source_detail=9702%2F12+May%2FJune+2018) |
| **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=d2d2f25a-4425-4e45-afd1-41e552c95466&question_id=e36531ee-9793-40c6-9683-a204651502c1&source_detail=9702%2F12+May%2FJune+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 | 0.20 Low | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=d2d2f25a-4425-4e45-afd1-41e552c95466&question_id=c1eb1e09-d17d-4c63-89b1-4011247b75aa&source_detail=9702%2F12+May%2FJune+2018) |
| **Q37** FRQ | [20.3 Potential dividers](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/potential-dividers/) | 1 | 0.20 Easy | 0.20 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=d2d2f25a-4425-4e45-afd1-41e552c95466&question_id=c9d17bed-79f7-40df-8ea1-8701a53812f1&source_detail=9702%2F12+May%2FJune+2018) |
| **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=d2d2f25a-4425-4e45-afd1-41e552c95466&question_id=b1cbeff9-1a1a-49cf-a5d3-fb9e0186314c&source_detail=9702%2F12+May%2FJune+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=d2d2f25a-4425-4e45-afd1-41e552c95466&question_id=0ec67091-81bc-4fac-9367-85897fc05baf&source_detail=9702%2F12+May%2FJune+2018) |
| **Q40** 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=d2d2f25a-4425-4e45-afd1-41e552c95466&question_id=7e9871a6-93db-4f1c-94aa-48dbf0777b7c&source_detail=9702%2F12+May%2FJune+2018) |

## 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/)
- [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/)
- [4.1 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/)
- [4.3 Linear momentum and its conservation](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/linear-momentum-and-its-conservation/)
- [6.3 Potential energy and kinetic energy](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/)
- [5.4 Density and pressure](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/density-and-pressure/)
- [5.1 Types of force](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/)
- [5.3 Equilibrium of forces](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/equilibrium-of-forces/)
- [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 0.29 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 65.0% Easy, 35.0% 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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Full page with native tables, bar charts and Practice Hub links: https://www.examsci.com/past-papers/cie-ial/physics/9702-paper-1/2018-may-june-9702-12/