Plumber Exam Prep Australia
Pass your Australian plumber licence exam with 5,000+ practice questions mapped to AS/NZS 3500, the Plumbing Code of Australia and state-specific compliance. Built for apprentices, journey plumbers and gasfitters chasing their ticket.
Free forever · No credit card · 300,000+ questions
What's on the Australian plumber exam
Australian plumber licensing assessments — whether you're sitting your Cert III capstone, the Plumbing Industry Commission practical, or a state licence exam — pull from the same core technical scope: water supply, sanitary plumbing, drainage, roofing & stormwater, mechanical services, gas (if endorsed) and backflow prevention. Every state then layers its own compliance and safety questions on top.
Voltly's plumber question bank is built around AS/NZS 3500 parts 1–5 and the Plumbing Code of Australia, with separate question pools for AS/NZS 5601 (gas), AS/NZS 2845 (backflow), and AS/NZS 3666 (warm water systems). Each question is tagged to the relevant clause so you can drill exactly where you're weak.
How Voltly gets you exam-ready faster
Most plumbing prep is either dry PDFs or thousand-dollar bootcamps. Voltly is a free, gamified app you can open on the train, on a smoko break, or on the couch.
- Adaptive difficulty — early questions calibrate your level; the engine then targets the categories you score lowest on.
- Weak-point drilling — every wrong answer flags the underlying concept so you re-encounter it until you nail it.
- Mock exams — full timed exams that mirror the real assessment structure and time pressure.
- Streaks, XP, ranks — daily streaks turn 10 minutes a day into exam-ready in weeks.
- Offline packs — Premium plumbers can download decks and study no-signal.
- AI tutor — ask why an answer is right; get an explanation in plain English with code references.
Who Voltly is for
If you're a Cert III plumbing apprentice prepping for capstone, a journey plumber sitting your contractor's licence, a gasfitter renewing endorsements, or a TAFE student grinding through your final assessments — Voltly is built for you. We've got 5,000+ Australian plumber questions and we ship new ones every week.
5 free sample questions
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Q1.Minimum fall for a DN100 sanitary drain in graded laying is:+
- 1:40
- 1:60 ✓ correct
- 1:100
- 1:200
Why: AS/NZS 3500.2 Table 6.5 — DN100 minimum grade is 1.65% which rounds to 1:60.
Q2.A testable backflow prevention device on a high-hazard cross-connection must be:+
- Dual check valve
- Reduced pressure zone (RPZ) ✓ correct
- Atmospheric vacuum breaker
- Single check valve
Why: AS/NZS 3500.1 requires an RPZ device for high-hazard cross-connections; it's the only listed testable high-hazard device.
Q3.Minimum trap water seal depth for a fixture trap is:+
- 20 mm
- 32 mm ✓ correct
- 40 mm
- 75 mm
Why: AS/NZS 3500.2 — minimum 32 mm water seal for floor and fixture traps.
Q4.The maximum length of an unvented branch drain serving a WC pan is:+
- 3 m
- 6 m ✓ correct
- 10 m
- 15 m
Why: AS/NZS 3500.2 Table 6.7 — unvented branch drain for a WC pan limited to 6 m.
Q5.A gasfitter installing an LPG cylinder must keep the cylinder valve at least how far from a drain opening?+
- 1 m
- 1.5 m
- 3.5 m ✓ correct
- 5 m
Why: AS/NZS 1596 requires LPG cylinders to be ≥ 3.5 m from drains, pits or openings to below-ground areas.
FAQ
What's on the Australian plumber licence exam?+
AS/NZS 3500 (Plumbing & Drainage), the Plumbing Code of Australia (PCA), state regs, backflow prevention, gas (where licensed) and on-site sanitary drainage. Voltly's plumber pack mirrors this scope question-for-question.
How long does it take to prep for the plumbing licence?+
Most apprentices study 6–12 weeks at 20 minutes a day. Voltly's streak system, daily challenge and weak-point drilling are built for exactly this rhythm.
Does the bank include Backflow and Gas modules?+
Yes — separate categories for water supply, sanitary plumbing, roofing & stormwater, gasfitting and backflow, all tagged to AS/NZS 3500 and AS/NZS 5601 where relevant.
Is there a free plan?+
Yes. 50 free questions a day forever — no credit card. Premium ($13.99/mo AUD) unlocks unlimited quizzes, mock exams and offline packs.
Can I study offline on site?+
Premium users can download plumber question packs and study with no signal. Progress syncs the next time you're online.