# 9702/13 October/November 2017

> 9702/13 October/November 2017: 40 questions, 40 marks. Difficulty 0.28, deviation 0.13, algebraic 0.24, text density 0.32. CIE IAL Physics 9702 P1.

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CIE IAL · Physics · 2017 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=a0fe70bd-10f6-4632-931e-c9206eca38d2)
- [All 9702 P1 papers](https://www.examsci.com/past-papers/cie-ial/physics/9702-paper-1/)

Core finding

**9702/13 October/November 2017 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 0.28 on a 0.20–0.75 scale, with a Difficulty Deviation of 0.13 and a mark split of 70.0% Easy, 27.5% Medium and 2.5% Hard. Algebraic complexity averages 0.24; text density and modelling average 0.32. 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**: 0.28 — 0.20–0.75 · nearer Easy
- **Difficulty Deviation**: 0.13 — 0 = uniform; higher = more mixed
- **Difficulty Ratio**: 70.0 / 27.5 / 2.5 — % Easy / Medium / Hard
- **Algebraic Complexity Measure**: 0.24 — 0.20–0.75 · nearer Low
- **Text Density and Modelling Measure**: 0.32 — 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** | 0.28 | Σ(d_i × w_i) / Σw_i, with d = 0.20 / 0.45 / 0.75 |
| **Difficulty Deviation** | 0.13 | √(Σw_i(d_i − μ)^2 / Σw_i) |
| **Difficulty Ratio** | 70.0% Easy / 27.5% Medium / 2.5% Hard | marks in band / all tagged marks |
| **Algebraic Complexity Measure** | 0.24 | Σ(c_i × marks_i) / Σmarks_i, with c = 0.20 / 0.45 / 0.75 |
| **Text Density and Modelling Measure** | 0.32 | 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=a0fe70bd-10f6-4632-931e-c9206eca38d2&question_id=2cb9069d-a3d0-4087-969d-9b223d65eb07&source_detail=9702%2F13+October%2FNovember+2017) |
| **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=a0fe70bd-10f6-4632-931e-c9206eca38d2&question_id=214658ae-dce9-4859-9e89-308866ce6bfe&source_detail=9702%2F13+October%2FNovember+2017) |
| **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=a0fe70bd-10f6-4632-931e-c9206eca38d2&question_id=7ef60cf9-7a00-4cbf-9288-9f8eb049d3ab&source_detail=9702%2F13+October%2FNovember+2017) |
| **Q4** 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=a0fe70bd-10f6-4632-931e-c9206eca38d2&question_id=f02e9fdc-5073-4869-a48a-df4ec842ba2c&source_detail=9702%2F13+October%2FNovember+2017) |
| **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=a0fe70bd-10f6-4632-931e-c9206eca38d2&question_id=66ac0f8d-39ad-4558-8cab-37c1d2ad1d00&source_detail=9702%2F13+October%2FNovember+2017) |
| **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 | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=a0fe70bd-10f6-4632-931e-c9206eca38d2&question_id=83a6afea-7906-439d-8842-a4adce64c40c&source_detail=9702%2F13+October%2FNovember+2017) |
| **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 | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=a0fe70bd-10f6-4632-931e-c9206eca38d2&question_id=04b8fdb8-f580-4422-a717-8da915b1b2ad&source_detail=9702%2F13+October%2FNovember+2017) |
| **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 | 0.45 Medium | 0.20 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=a0fe70bd-10f6-4632-931e-c9206eca38d2&question_id=6b2764cf-ffee-46b0-b99a-120c0908819b&source_detail=9702%2F13+October%2FNovember+2017) |
| **Q9** 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 | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=a0fe70bd-10f6-4632-931e-c9206eca38d2&question_id=a44336e5-b744-4fed-84b6-6414ea14e880&source_detail=9702%2F13+October%2FNovember+2017) |
| **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 | 0.20 Easy | 0.20 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=a0fe70bd-10f6-4632-931e-c9206eca38d2&question_id=8fec1b6a-9910-477c-862b-829a5c99c751&source_detail=9702%2F13+October%2FNovember+2017) |
| **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=a0fe70bd-10f6-4632-931e-c9206eca38d2&question_id=c56bd8cc-6bba-4853-a7a5-7a7f5f4e9e39&source_detail=9702%2F13+October%2FNovember+2017) |
| **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=a0fe70bd-10f6-4632-931e-c9206eca38d2&question_id=0ec1782a-04ba-4b20-8e9e-9b3e7f70fd2e&source_detail=9702%2F13+October%2FNovember+2017) |
| **Q13** 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=a0fe70bd-10f6-4632-931e-c9206eca38d2&question_id=2b1d0b9d-f735-4239-a77d-a9c63e5db0fc&source_detail=9702%2F13+October%2FNovember+2017) |
| **Q14** 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 | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=a0fe70bd-10f6-4632-931e-c9206eca38d2&question_id=5d83315a-d262-4890-92a0-5ab40c3656a0&source_detail=9702%2F13+October%2FNovember+2017) |
| **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=a0fe70bd-10f6-4632-931e-c9206eca38d2&question_id=c30ac152-0765-4147-97d3-821491ce9b8e&source_detail=9702%2F13+October%2FNovember+2017) |
| **Q16** 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=a0fe70bd-10f6-4632-931e-c9206eca38d2&question_id=5719fd96-4378-462b-9f82-6e256e37e090&source_detail=9702%2F13+October%2FNovember+2017) |
| **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 | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=a0fe70bd-10f6-4632-931e-c9206eca38d2&question_id=36388196-a3c5-4300-8fc4-2c72400fcc1c&source_detail=9702%2F13+October%2FNovember+2017) |
| **Q18** FRQ | [6.3 Potential energy and kinetic energy](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=a0fe70bd-10f6-4632-931e-c9206eca38d2&question_id=2bc99668-418f-434a-a38d-7e0a92106465&source_detail=9702%2F13+October%2FNovember+2017) |
| **Q19** FRQ | [6.4 Power](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=a0fe70bd-10f6-4632-931e-c9206eca38d2&question_id=6289f5d3-a15f-4a49-bf25-4a7e6c2a0e21&source_detail=9702%2F13+October%2FNovember+2017) |
| **Q20** FRQ | [9.2 Elastic and plastic behaviour](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/elastic-and-plastic-behaviour/) | 1 | 0.45 Medium | 0.20 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=a0fe70bd-10f6-4632-931e-c9206eca38d2&question_id=0cceff68-970d-41be-8210-eaf2c0645fe9&source_detail=9702%2F13+October%2FNovember+2017) |
| **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 | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=a0fe70bd-10f6-4632-931e-c9206eca38d2&question_id=4b1335c2-9e02-4a66-9042-ede9a5193843&source_detail=9702%2F13+October%2FNovember+2017) |
| **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=a0fe70bd-10f6-4632-931e-c9206eca38d2&question_id=8e173637-07cb-4bbe-9b6c-07a2bb7352d3&source_detail=9702%2F13+October%2FNovember+2017) |
| **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=a0fe70bd-10f6-4632-931e-c9206eca38d2&question_id=42583d15-6450-4976-8228-39e6dbe1e3d5&source_detail=9702%2F13+October%2FNovember+2017) |
| **Q24** 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=a0fe70bd-10f6-4632-931e-c9206eca38d2&question_id=fec14df0-b599-48b1-8940-c45f2dc161e8&source_detail=9702%2F13+October%2FNovember+2017) |
| **Q25** FRQ | [14.4 Doppler effect](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/) | 1 | 0.20 Easy | 0.20 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=a0fe70bd-10f6-4632-931e-c9206eca38d2&question_id=bff5f8b9-2db5-4e2f-ab87-a93d82bf3821&source_detail=9702%2F13+October%2FNovember+2017) |
| **Q26** 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=a0fe70bd-10f6-4632-931e-c9206eca38d2&question_id=198c1013-8a77-4b77-99ec-5ea5ec823565&source_detail=9702%2F13+October%2FNovember+2017) |
| **Q27** 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=a0fe70bd-10f6-4632-931e-c9206eca38d2&question_id=33c2f205-121a-4a07-86e7-10d3604d2a3f&source_detail=9702%2F13+October%2FNovember+2017) |
| **Q28** 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=a0fe70bd-10f6-4632-931e-c9206eca38d2&question_id=d084f6db-095b-49d3-ac41-b31c6eab01b0&source_detail=9702%2F13+October%2FNovember+2017) |
| **Q29** 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=a0fe70bd-10f6-4632-931e-c9206eca38d2&question_id=09c98501-5fa3-4c20-9d9a-f5c7cf3d49be&source_detail=9702%2F13+October%2FNovember+2017) |
| **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=a0fe70bd-10f6-4632-931e-c9206eca38d2&question_id=c96c0670-cf38-473c-92d2-30a2452c7fd7&source_detail=9702%2F13+October%2FNovember+2017) |
| **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=a0fe70bd-10f6-4632-931e-c9206eca38d2&question_id=4f37f6fe-4741-4b79-aa52-0105afc5db58&source_detail=9702%2F13+October%2FNovember+2017) |
| **Q32** 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=a0fe70bd-10f6-4632-931e-c9206eca38d2&question_id=e69e92e2-3f29-4dee-8368-df92d2496fa8&source_detail=9702%2F13+October%2FNovember+2017) |
| **Q33** 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=a0fe70bd-10f6-4632-931e-c9206eca38d2&question_id=210ec8c1-bcbb-490e-8100-8c3b3f99a826&source_detail=9702%2F13+October%2FNovember+2017) |
| **Q34** 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=a0fe70bd-10f6-4632-931e-c9206eca38d2&question_id=3b9677e3-4ed5-499d-af72-3763939dd45d&source_detail=9702%2F13+October%2FNovember+2017) |
| **Q35** 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 | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=a0fe70bd-10f6-4632-931e-c9206eca38d2&question_id=00d07a85-b449-4bb3-a0ce-a81298c93fb1&source_detail=9702%2F13+October%2FNovember+2017) |
| **Q36** FRQ | [20.1 Practical circuits](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/practical-circuits/) | 1 | 0.75 Hard | 0.45 Medium | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=a0fe70bd-10f6-4632-931e-c9206eca38d2&question_id=711bc94d-6e47-49da-b2c8-b5e6e65b51b9&source_detail=9702%2F13+October%2FNovember+2017) |
| **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=a0fe70bd-10f6-4632-931e-c9206eca38d2&question_id=62efe84d-cc5e-4067-8b82-1cc2590f3bcf&source_detail=9702%2F13+October%2FNovember+2017) |
| **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 | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=a0fe70bd-10f6-4632-931e-c9206eca38d2&question_id=a4692ab3-3d2f-4f3e-907f-b2db0ba68df6&source_detail=9702%2F13+October%2FNovember+2017) |
| **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=a0fe70bd-10f6-4632-931e-c9206eca38d2&question_id=1a8bb1cb-7e0f-4cd5-a9dd-07e62899c494&source_detail=9702%2F13+October%2FNovember+2017) |
| **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=a0fe70bd-10f6-4632-931e-c9206eca38d2&question_id=be61e256-32b6-46de-93c3-02fc49bc0f76&source_detail=9702%2F13+October%2FNovember+2017) |

## Topics in this paper

- [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/)
- [2.2 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/)
- [5.1 Types of force](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/)
- [5.2 Turning effects of forces](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/turning-effects-of-forces/)
- [5.3 Equilibrium of forces](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/equilibrium-of-forces/)
- [5.4 Density and pressure](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/density-and-pressure/)
- [6.1 Energy conversion and conservation](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 0.28 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 0.13, 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 70.0% Easy, 27.5% Medium and 2.5% 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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Full page with native tables, bar charts and Practice Hub links: https://www.examsci.com/past-papers/cie-ial/physics/9702-paper-1/2017-october-november-9702-13/