Engineering 2025 v1.4 General senior syllabus
The external examination allows 120 minutes working time and, from 2026, 5 minutes perusal. It combines multiple choice, written short response and calculation questions using the supplied Engineering formula and data book. The 20 original papers in this hub use a 77-mark practice benchmark drawn from the 2025 paper; the real total has varied, so 77 is not a fixed syllabus requirement. Unit 3 civil structures are assessed through school internal assessment.
Past papers on this subject span more than one syllabus. Papers written under an older one still work as practice, but the units and topics they test have changed — the index labels every paper with the syllabus it was set under.
Published papers before the 2026 changes · 2020–2025
The units and topics, one by one
Each area below lists the concepts named in the syllabus, what the QCAA exam asks of them, and the mistake that most often costs marks.
- Unit 3 Topic 1 — Civil structures in society
- Unit 3 Topic 2 — Civil structures and forces
- Unit 3 Topic 3 — Civil engineering materials
- Unit 4 Topic 1 — Machines in society
- Unit 4 Topic 2 — Machines, mechanisms and control
- Unit 4 Topic 3 — Materials
Area 1 of 6
Unit 3 Topic 1 — Civil structures in society
Civil engineering connects structural performance with community needs and environmental consequences. Compare the work of coastal, structural, transport, water resource and environmental specialists, and investigate how their responsibilities overlap in a project. Material acquisition, manufacture, transport, maintenance and end of life all belong in a life-cycle comparison. Corrosion protection and inspection connect reliability with the conditions in which a structure operates.
What the exam asks
Unit 3 is assessed internally. Use diagrams, calculations and evidence-based explanations in the school’s assessment context; it is not the content scope of the external paper.
Where marks go missing
Comparing materials by purchase cost or mass alone without an equivalent function, service life and maintenance basis.
Area 2 of 6
Unit 3 Topic 2 — Civil structures and forces
Build a free-body diagram before solving reactions at a pin or roller. Use force and moment equilibrium to relate applied loads to support reactions, then analyse ideal trusses using joints or sections with clearly stated tension and compression conventions. Shear-force and bending-moment diagrams connect loading with internal action. The syllabus scope here uses vertical point loads rather than adding distributed-load problems beyond the specified treatment.
What the exam asks
Unit 3 is assessed internally. Use diagrams, calculations and evidence-based explanations in the school’s assessment context; it is not the content scope of the external paper.
Where marks go missing
Solving moments without perpendicular distances or interpreting a negative assumed tension force as an error rather than compression.
Area 3 of 6
Unit 3 Topic 3 — Civil engineering materials
Material selection requires distinctions between strength, stiffness, toughness, hardness, brittleness and ductility. Stress, strain and Young’s modulus connect test measurements to material response, while stress–strain diagrams show yielding, elastic behaviour and failure. Concrete, timber, steel and laminates have different responses to loading and different processing histories. Reinforcement, pre-tensioning, post-tensioning and a justified factor of safety must be connected with the way a component carries load.
What the exam asks
Unit 3 is assessed internally. Use diagrams, calculations and evidence-based explanations in the school’s assessment context; it is not the content scope of the external paper.
Where marks go missing
Mixing millimetres and metres, treating strain as a length, or using a post-yield stress-to-total-strain ratio as Young’s modulus.
Area 4 of 6
Unit 4 Topic 1 — Machines in society
Machines are evaluated as responses to community problems. Mechanical, mechatronic and biomechanical engineers combine knowledge of mechanisms, materials and control with the needs of users. A defensible project defines measurable success criteria and constraints before comparing concepts. Evaluation should connect evidence from the proposed solution with the original problem rather than assume that a faster or more automated device is automatically better.
What the exam asks
Unit 4 provides the external-assessment content. Practise selecting and applying relationships from the supplied formula and data book, interpreting unfamiliar stimulus and justifying conclusions with working or specific evidence.
Where marks go missing
Selecting a mechanism before defining the task and then judging it against vague or unrelated criteria.
Area 5 of 6
Unit 4 Topic 2 — Machines, mechanisms and control
Mechanical advantage and velocity ratio describe different parts of a machine’s force–displacement trade-off. Study levers, screws, pulleys, belt drives and gears alongside work, power, energy and losses. Solve uniformly accelerated motion and friction problems with a consistent sign convention and labelled force diagram. Translate control requirements into logic expressions and truth tables, and analyse series and parallel circuits using current, voltage, resistance and power relationships.
What the exam asks
Unit 4 provides the external-assessment content. Practise selecting and applying relationships from the supplied formula and data book, interpreting unfamiliar stimulus and justifying conclusions with working or specific evidence.
Where marks go missing
Reversing driver/driven ratios, treating static friction as always at its limiting value, or omitting the squared terms in energy and motion equations.
Area 6 of 6
Unit 4 Topic 3 — Materials
Use lead–tin phase diagrams to identify phases and apply the inverse lever rule with composition and mass conservation checks. Distinguish phases from microconstituents in the steel portion of the iron–carbon system, including ferrite, austenite, cementite and pearlite. Connect carbon content and heat treatment with the hardness, strength, ductility and toughness required in service. Compare grade-specific data for ABS, PC and PA6 against the component’s functional and environmental requirements.
What the exam asks
Unit 4 provides the external-assessment content. Practise selecting and applying relationships from the supplied formula and data book, interpreting unfamiliar stimulus and justifying conclusions with working or specific evidence.
Where marks go missing
Confusing phase composition with phase fraction, calling pearlite a single phase, or selecting a polymer without checking grade and service conditions.