Year 12 Engineering · Unit 4 and external exam
Learn the content. Apply it. Prepare for the exam.
The Unit 4 Learning Hub follows only the lessons in the Term 3 overview. The existing exam-practice system remains available as a separate preparation area.
Scope rule: only lessons shown in the supplied Term 3 overview are included in this learning hub.
Unit 4
Materials, circuits, engineering contexts and exam preparation
Unit 4 Learning Hub
Term 3 learning sequence
This hub follows the supplied Term 3 sequence and is aligned to QCAA Engineering 2025 v1.4. Each module combines syllabus focus, clear diagrams, exact formula relationships, worked thinking and exam-style practice.
Learning modules
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Each module is a student-facing learning reference: syllabus focus, key knowledge, diagrams, worked examples, common errors and practice prompts.
QCAA Engineering 2025 v1.4
Current Unit 4 content, formula conventions and exam conditions.
The Term 3 sequence is retained, but legacy lesson material has been corrected and expanded using the current syllabus and QCAA formula book.
External exam preparation
Choose how you want to practise
The original practice workspace, searchable formula book, official-paper modes and generated exam remain intact.
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Marker cues
What the marker is looking for
Worked solution
Model response
Full exam mode
Full papers and past-paper practice
Use 2024 and 2025 as full timed papers. Earlier QCAA papers are available below with a current-syllabus audit so you can practise the useful questions without accidentally revising superseded content.
External assessment 2024
2024 paper
79 marks
22 questions
125 minutes
- 10 multiple choice questions
- 6 short response written questions
- 6 short response calculation questions
External assessment 2025
2025 paper
77 marks
22 questions
125 minutes
- 10 multiple choice questions
- 6 short response written questions
- 6 short response calculation questions
New questions every time
Generated practice paper
22 questions
125 minutes
Fresh values
A complete QCAA-style paper built from original questions inspired by the skills and structures in the past exams.
- 10 multiple choice questions
- 6 short response written questions
- 6 short response calculation questions
Earlier QCAA papers
2020–2023 · audited for the current syllabus
The original papers are linked unchanged. Practise current questions opens only the questions already audited as directly relevant to the current Unit 4 / external exam focus; legacy or out-of-scope items are not mixed into that practice bank.
QCAA 2020
2020 external assessment
15 / 23 directly current
6 need adaptation
2 excluded
See syllabus audit
Use as-is: Q1–3, Q6–9, Q14, Q16–19, Q21–23.
Legacy / adapt: Q4 older plastics set; Q5 legacy conveyor-capacity calculation; Q12 PLA emphasis; Q13 lamellar morphology; Q15 older Topic 1 framing; Q20(b) legacy efficiency relationship.
Exclude from current practice: Q10 stress–strain feature and Q11 proportional-limit / stress–strain response.
QCAA 2021
2021 external assessment
17 / 23 directly current
2 need adaptation
4 excluded
See syllabus audit
Use as-is: Q1–2, Q4–10, Q15–16, Q18–23.
Legacy / adapt: Q12 biomedical-engineering career framing and Q17 older machines-in-society / sustainability framing.
Exclude from current practice: Q3 stress–strain stiffness; Q11 nylon stress–strain; Q13 cast iron; Q14 tensile-test / ductility.
QCAA 2022
2022 external assessment
18 / 22 directly current
2 need adaptation
2 excluded
See syllabus audit
Use as-is: Q3–14, Q16, Q18–22.
Legacy / adapt: Q2 older plastics set and Q15 legacy mild/high-carbon-steel wording.
Exclude from current practice: Q1 stress–strain toughness and Q17 nylon / ENR stress–strain interpretation.
QCAA 2023
2023 external assessment
19 / 21 directly current
1 needs adaptation
1 excluded
See syllabus audit
Use as-is: Q2–5, Q7–21.
Legacy / adapt: Q1 uses the older plastics set.
Exclude from current practice: Q6 stress–strain / proportional-limit interpretation.
How marking works
Official 2024 and 2025 papers use the published QCAA marking-guide criteria. The 2020–2023 audit links to the original QCAA papers and routes directly current questions into targeted practice with their published source and marking-guide material. Generated papers use equivalent criterion-based checks written for each original question.
Section 1
Question 1
Official question page
Click the page to enlarge it.
Official assessment pages reproduced from QCAA Engineering external assessment materials. © State of Queensland (QCAA), licensed under CC BY 4.0 except identified third-party content.
Exam results
Engineering
Review every marking-guide criterion below. Automated marking is provisional for written responses, diagrams and follow-through marks.
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