# 9702/11 May/June 2019

> 9702/11 May/June 2019: 40 questions, 40 marks. Difficulty 0.27, deviation 0.11, algebraic 0.23, text density 0.35. 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=5329a19c-c525-4fdc-b080-bf202aa34008)
- [All 9702 P1 papers](https://www.examsci.com/past-papers/cie-ial/physics/9702-paper-1/)

Core finding

**9702/11 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 0.27 on a 0.20–0.75 scale, with a Difficulty Deviation of 0.11 and a mark split of 72.5% Easy, 27.5% Medium and 0.0% Hard. Algebraic complexity averages 0.23; text density and modelling average 0.35. 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**: 0.27 — 0.20–0.75 · nearer Easy
- **Difficulty Deviation**: 0.11 — 0 = uniform; higher = more mixed
- **Difficulty Ratio**: 72.5 / 27.5 / 0.0 — % Easy / Medium / Hard
- **Algebraic Complexity Measure**: 0.23 — 0.20–0.75 · nearer Low
- **Text Density and Modelling Measure**: 0.35 — 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** | 0.27 | 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** | 72.5% Easy / 27.5% 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** | 0.35 | 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=5329a19c-c525-4fdc-b080-bf202aa34008&question_id=9fcde2f3-2d0e-4e8f-b85a-2fedea724e2f&source_detail=9702%2F11+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=5329a19c-c525-4fdc-b080-bf202aa34008&question_id=3e21b71d-e253-4e04-8030-c866525e653c&source_detail=9702%2F11+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 | 0.20 Easy | 0.20 Low | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=5329a19c-c525-4fdc-b080-bf202aa34008&question_id=2d877cc1-ac6e-484e-ab7d-70050325ea36&source_detail=9702%2F11+May%2FJune+2019) |
| **Q4** 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=5329a19c-c525-4fdc-b080-bf202aa34008&question_id=b33988d1-2ebe-4729-bd18-f0c278704361&source_detail=9702%2F11+May%2FJune+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=5329a19c-c525-4fdc-b080-bf202aa34008&question_id=e7e388c7-f549-4e37-bb42-2bd20d501cb7&source_detail=9702%2F11+May%2FJune+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=5329a19c-c525-4fdc-b080-bf202aa34008&question_id=41abeaa0-d6c6-4d1c-bcce-83f3a652b1d7&source_detail=9702%2F11+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 | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=5329a19c-c525-4fdc-b080-bf202aa34008&question_id=e2c217e5-e021-497c-acbe-2bc05ba4639a&source_detail=9702%2F11+May%2FJune+2019) |
| **Q8** 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=5329a19c-c525-4fdc-b080-bf202aa34008&question_id=144aa6ee-3f11-444b-af32-bb6e77c468a8&source_detail=9702%2F11+May%2FJune+2019) |
| **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 | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=5329a19c-c525-4fdc-b080-bf202aa34008&question_id=21188e3e-5044-4882-bbcd-748c05c69e77&source_detail=9702%2F11+May%2FJune+2019) |
| **Q10** FRQ | [4.2 Non-uniform motion](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/non-uniform-motion/) | 1 | 0.45 Medium | 0.20 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=5329a19c-c525-4fdc-b080-bf202aa34008&question_id=beaebd69-e15b-443b-ac18-91e4e89d4f59&source_detail=9702%2F11+May%2FJune+2019) |
| **Q11** 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=5329a19c-c525-4fdc-b080-bf202aa34008&question_id=43e08408-6aed-4794-a9ba-8ff6dac480a6&source_detail=9702%2F11+May%2FJune+2019) |
| **Q12** FRQ | [5.1 Types of force](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=5329a19c-c525-4fdc-b080-bf202aa34008&question_id=a19b5163-d6b8-49b2-94a5-3f609db9d24c&source_detail=9702%2F11+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=5329a19c-c525-4fdc-b080-bf202aa34008&question_id=da9e5cc1-b36c-4bec-b538-7b72c97ef9b4&source_detail=9702%2F11+May%2FJune+2019) |
| **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 | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=5329a19c-c525-4fdc-b080-bf202aa34008&question_id=9c6609f0-6cc7-4661-a878-20ad64c58815&source_detail=9702%2F11+May%2FJune+2019) |
| **Q15** 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 | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=5329a19c-c525-4fdc-b080-bf202aa34008&question_id=44c43bf6-19f6-454f-b84b-4984d226be63&source_detail=9702%2F11+May%2FJune+2019) |
| **Q16** 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=5329a19c-c525-4fdc-b080-bf202aa34008&question_id=44c53445-8f90-4c98-b8b4-759a1efbc5d5&source_detail=9702%2F11+May%2FJune+2019) |
| **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=5329a19c-c525-4fdc-b080-bf202aa34008&question_id=ac876e10-ded5-4e1d-a14a-7f75f64edee3&source_detail=9702%2F11+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=5329a19c-c525-4fdc-b080-bf202aa34008&question_id=f122a4a7-40ca-4095-9594-cfd2b176f188&source_detail=9702%2F11+May%2FJune+2019) |
| **Q19** 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 | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=5329a19c-c525-4fdc-b080-bf202aa34008&question_id=1553fcae-0138-42b7-8203-f5784d08275e&source_detail=9702%2F11+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 | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=5329a19c-c525-4fdc-b080-bf202aa34008&question_id=c57076c2-6b39-49ef-a580-a8d482c033b0&source_detail=9702%2F11+May%2FJune+2019) |
| **Q21** 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=5329a19c-c525-4fdc-b080-bf202aa34008&question_id=aaeb18d9-3787-4ae5-a9db-bd52be285d17&source_detail=9702%2F11+May%2FJune+2019) |
| **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=5329a19c-c525-4fdc-b080-bf202aa34008&question_id=6a5be4ae-299f-426d-b7dd-6e2aac152d61&source_detail=9702%2F11+May%2FJune+2019) |
| **Q23** FRQ | [14.2 Transverse and longitudinal waves](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/transverse-and-longitudinal-waves/) | 1 | 0.45 Medium | 0.20 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=5329a19c-c525-4fdc-b080-bf202aa34008&question_id=75572ee9-0a59-4f12-8963-62f47ac925dd&source_detail=9702%2F11+May%2FJune+2019) |
| **Q24** FRQ | [14.3 Determination of frequency and wavelength of sound waves](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/) | 1 | 0.20 Easy | 0.20 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=5329a19c-c525-4fdc-b080-bf202aa34008&question_id=2a5a1256-2712-4742-9895-fef2e42dc230&source_detail=9702%2F11+May%2FJune+2019) |
| **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=5329a19c-c525-4fdc-b080-bf202aa34008&question_id=59d66822-0402-49c5-99a7-2679690364a6&source_detail=9702%2F11+May%2FJune+2019) |
| **Q26** 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=5329a19c-c525-4fdc-b080-bf202aa34008&question_id=f76d1328-d70d-4c28-9cbf-e5ad52653698&source_detail=9702%2F11+May%2FJune+2019) |
| **Q27** 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=5329a19c-c525-4fdc-b080-bf202aa34008&question_id=631d827f-edc8-4513-a723-f8439cefb133&source_detail=9702%2F11+May%2FJune+2019) |
| **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=5329a19c-c525-4fdc-b080-bf202aa34008&question_id=0a61feea-6e42-4f95-b155-9486a9cc60db&source_detail=9702%2F11+May%2FJune+2019) |
| **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 | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=5329a19c-c525-4fdc-b080-bf202aa34008&question_id=3b75d91c-5796-4cb2-9cb3-629fe2b73d6c&source_detail=9702%2F11+May%2FJune+2019) |
| **Q30** FRQ | [15.3 Interference, two-source interference](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=5329a19c-c525-4fdc-b080-bf202aa34008&question_id=b6b2aee2-7c67-4176-8a7c-5c38d681f48b&source_detail=9702%2F11+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=5329a19c-c525-4fdc-b080-bf202aa34008&question_id=ae4a00f4-f1cd-4a18-a45f-1b4fc0c862db&source_detail=9702%2F11+May%2FJune+2019) |
| **Q32** 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=5329a19c-c525-4fdc-b080-bf202aa34008&question_id=3c4c1a38-4eba-4cab-bcd8-f22ef1546873&source_detail=9702%2F11+May%2FJune+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=5329a19c-c525-4fdc-b080-bf202aa34008&question_id=98fcf563-e82d-4504-8573-513bd88d389c&source_detail=9702%2F11+May%2FJune+2019) |
| **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=5329a19c-c525-4fdc-b080-bf202aa34008&question_id=07b9c2f5-356d-4e9d-bdc1-ec62e9abe836&source_detail=9702%2F11+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 | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=5329a19c-c525-4fdc-b080-bf202aa34008&question_id=cc94e550-6dab-442c-8c0f-8b22d2a0a2a4&source_detail=9702%2F11+May%2FJune+2019) |
| **Q36** FRQ | [20.1 Practical circuits](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/practical-circuits/) | 1 | 0.45 Medium | 0.45 Medium | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=5329a19c-c525-4fdc-b080-bf202aa34008&question_id=f68478b4-cf50-48d0-bb72-75463c2db389&source_detail=9702%2F11+May%2FJune+2019) |
| **Q37** 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 | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=5329a19c-c525-4fdc-b080-bf202aa34008&question_id=a10b6cb5-87a0-4c8e-9836-1d31814c3034&source_detail=9702%2F11+May%2FJune+2019) |
| **Q38** 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=5329a19c-c525-4fdc-b080-bf202aa34008&question_id=f0023d68-ef7d-40dc-acc3-cad4ce7dc336&source_detail=9702%2F11+May%2FJune+2019) |
| **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=5329a19c-c525-4fdc-b080-bf202aa34008&question_id=60bae825-3a51-4e35-a29a-090690e215d2&source_detail=9702%2F11+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=5329a19c-c525-4fdc-b080-bf202aa34008&question_id=4336b481-8e69-4d5e-844a-69f455d5802d&source_detail=9702%2F11+May%2FJune+2019) |

## 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/)
- [2.1 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/)
- [6.2 Work and efficiency](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/)
- [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 0.27 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 72.5% Easy, 27.5% 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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