Ten 403A Carpenter questions in the format of the Red Seal exam: four options, one correct answer, no trick questions. They are free to use, print and share. There is nothing to sign up for on this page.
01How to use these
The questions come from the TicketPrep 403A bank and are spread across the exam's work activities in the order and roughly the proportion the Red Seal Program publishes for this trade: A (performs common occupational skills), B (performs planning and layout), C (performs concrete work), D (performs framing), E (performs exterior finishing), F (performs interior finishing), G (performs renovations). Answer each one before opening the explanation. Every explanation covers all four options, because on the real exam the wrong options are written to be plausible, and knowing why they are wrong is most of the skill.
- Pace. The exam allows four hours for 100 questions, so about 2 min 24 s per question. Try these at that pace.
- Print. The printed version shows the questions and the answer key without the explanations, so it works as a handout.
- Mark. The pass mark is 70 percent on every Red Seal trade; seven of ten here is the same bar.
02The questions
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A carpenter needs to cut rebar with a 115 mm (4-1/2 in.) angle grinder whose no-load speed is 11 000 rpm. The only cut-off discs in the truck are marked for a maximum of 8 500 rpm. What should the carpenter do?
- Use the 8 500 rpm disc because the load of cutting slows the wheel enough
- Get a disc rated for at least 11 000 rpm
- Use the 8 500 rpm disc but feather the trigger to keep the speed down
- Fit a larger 125 mm disc so the edge speed is lower
Show the answer
B. Correct. The maximum rpm marked on a disc must be equal to or greater than the no-load speed of the tool. A disc spun faster than its rating can burst. The rpm rating, disc diameter and arbor size all have to match the grinder.
Why not the others
A. The disc is at full 11 000 rpm before it touches the steel and again every time it comes out of the cut. Load does not make an under-rated disc safe.
C. A single-speed grinder reaches its full no-load speed as soon as the trigger is held; you cannot reliably throttle it. The disc's rating is an absolute limit, not a target.
D. A larger disc actually has a higher rim speed at the same rpm, and it will not fit under the guard of a 115 mm grinder. Disc diameter must match the tool as well as the rpm rating.
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A foundation plan is drawn at a scale of 1:50. A wall on the plan measures 184 mm with a metric scale ruler. What is the actual length of the wall?
- 3.68 m
- 9.20 m
- 4.60 m
- 18.40 m
Show the answer
B. Correct. At 1:50, 1 mm on the drawing equals 50 mm in the building: 184 mm × 50 = 9 200 mm = 9.20 m. Scaled lengths are a check only — a written dimension always governs over a scaled one.
Why not the others
A. This is 184 × 20 — the 1:20 scale. Always read the scale in the title block (or beside the drawing) before converting; 1:20 is a detail scale, not a plan scale.
C. This multiplies by 25. Nothing on a 1:50 drawing is 25 times smaller than life; at 1:50 every 1 mm on paper is 50 mm on site.
D. This is 184 × 100, the 1:100 scale. Using the wrong scale on a combination ruler is the most common reading error; confirm the scale on each sheet because details and plans are often at different scales.
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A strip footing is 600 mm wide and 250 mm deep and runs 46.0 m around the perimeter of a foundation. What volume of concrete does the footing require (before waste)?
- 6.90 m³
- 3.45 m³
- 1.38 m³
- 5.52 m³
Show the answer
A. Correct. Convert to metres first: 0.600 × 0.250 × 46.0 = 6.90 m³. A waste allowance (commonly 5–10% for footings dug in soil) is then added when placing the order; the cubic metre is the unit ready-mix is sold in.
Why not the others
B. This is half the correct volume — the result of using 300 mm (half the width) or 125 mm for the depth. Volume is width × depth × length with all three in metres.
C. This uses 50 mm for the depth (or 0.05 m). The footing is 250 mm deep — 0.25 m. A decimal slip on a concrete order is expensive either way.
D. This uses 200 mm for the depth. Read the footing section carefully: 250 mm = 0.25 m.
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A trench for a footing extension is 1.8 m (6 ft) deep in loose, previously disturbed fill. Before anyone enters the trench, what must be in place?
- Plywood sheets laid against the walls and held with stakes
- Shoring or a trench box, plus a ladder for access and egress
- A warning sign and barricade tape around the excavation
- A spotter at the top of the trench watching the walls for movement
Show the answer
B. Correct. Once a trench is deeper than roughly 1.2 m (4 ft), OH&S regulations require the walls to be sloped back, shored or protected by a trench box before workers enter. Access and egress (a ladder extending about 1 m above the edge, close to the work) is provided before shoring is erected, not after.
Why not the others
A. Plywood sheathing on its own has no strength against soil pressure. Sheathing must be backed by walers and struts or screw jacks designed for the soil and depth.
C. Signage protects people at the surface, not the person in the trench. The hazard to the worker inside is wall collapse, and only sloping, shoring or a shield controls it.
D. A spotter is not a substitute for support. Loose fill can collapse in seconds and a watcher cannot stop it; provincial OH&S rules require the walls to be sloped, shored or shielded once the trench is deeper than about 1.2 m.
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A 450 × 450 mm (18 × 18 in.) square column form 3.6 m (12 ft) tall is built from plywood and clamped with adjustable steel column clamps. How should the clamps be spaced?
- Only at the top and bottom, with the plywood spanning between them
- Evenly at about 600 mm (24 in.) from top to bottom
- Closer together near the top, where the concrete is dropped in
- Closer together near the bottom and wider apart toward the top
Show the answer
D. Correct. Column forms fill quickly, so the pressure is close to full liquid head and greatest at the base. Clamp spacing follows the manufacturer's chart for the pour height: tight at the bottom (often 200 to 300 mm) and opening up toward the top. Chamfer strips in the corners reduce the sharp edge and help stripping.
Why not the others
A. Plywood cannot span 3.6 m under concrete pressure. Clamps are spaced to suit the plywood's allowable span at each pressure level.
B. Even spacing either over-clamps the top or under-clamps the bottom. The pressure is not even, so the clamps should not be.
C. The drop creates a brief impact but the sustained pressure at the top is nearly zero. The base is where clamps are needed.
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A built-up post in the wall above lands on an I-joist floor system between two joists. What must be installed in the floor system at that location?
- A double I-joist directly under the post
- A 19 mm (3/4 in.) plywood subfloor patch glued under the post
- A joist hanger hung from the adjacent joists
- Squash blocks or a blocking panel under the post, bearing on the plate below
Show the answer
D. Correct. I-joist flanges and webs are not designed to carry a concentrated load through the floor. Solid squash blocks (cut about 2 mm taller than the joist so they take the load first) or a manufacturer blocking panel carry the point load straight through to the wall or beam below.
Why not the others
A. Doubling the joist only helps if the load lands on the joist; a load between joists still has to cross the subfloor. The manufacturer detail for a point load through the floor is squash blocks, not extra joists.
B. Subfloor is a diaphragm and walking surface, not a load path. A concentrated load through plywood alone will crush the I-joist flange or deflect the panel.
C. Hangers transfer a joist's shear into a header; they do nothing for a vertical load coming down through the floor. Use squash blocks that bear on the plate below.
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Two structural insulated panels (SIPs) are being joined at a vertical seam. How is the joint made so the wall is both structural and airtight?
- Butt the panels tight and rely on the OSB skins to carry the load across the joint
- Nail a 38 x 89 mm (2 x 4) on the outside face over the joint
- Leave the joint open and fill it later with spray foam from the inside
- Spline per the manufacturer, joint sealed with the specified foam or sealant, then screwed
Show the answer
D. Correct. SIP walls rely on the spline (surface spline, block spline or dimensional lumber) to transfer load across the joint, and on continuous sealant or expanding foam at every seam to maintain the air barrier, which the panels themselves provide. Fastening follows the panel manufacturer's schedule.
Why not the others
A. The skins are not connected across a plain butt joint; without a spline the wall has a hinge there. The spline and sealant are both required.
B. A surface-applied stud does not connect the skins or seal the joint. SIP joints use an internal spline and sealant.
C. Foam alone is not structural. The spline goes in during assembly; the sealant is applied as the panels are joined, not afterwards.
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A hollow metal door frame is being set in a concrete block wall that the masons will grout solid. What must be done to the frame's hinge and strike reinforcements before the blocks go up around it?
- Leave the boxes open so grout bonds to the hinge reinforcements
- Fill the hinge and strike boxes with expanding foam
- Cover the hinge and strike boxes with mortar guards or tape
- Install the hinges and strike plate first so the holes are occupied
Show the answer
C. Correct. Grout and mortar flow into the frame as the wall is filled. Mortar guards (or tape over the cutouts) keep the tapped hinge and strike reinforcements clear so the hardware can be installed later. The frame is also braced plumb and square before grouting.
Why not the others
A. Grout in the hinge boxes is exactly the problem: it fills the tapped holes and has to be chipped out. The frame is filled for strength and fire rating, but the hardware pockets must stay clean.
B. Foam is not the answer: it is hard to remove cleanly from the tapped holes and can leave residue that fouls the threads. Purpose-made mortar guards or tape are used instead.
D. Hardware installed before grouting gets buried in mortar splatter and may be damaged by the masons. The reinforcements are protected, and the hardware goes on after the wall is finished.
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A carpenter is screwing 12.7 mm (1/2 in.) gypsum board to a wood-framed ceiling with no adhesive. What maximum screw spacing along each joist should be used?
- 600 mm (24 in.) o.c.
- 200 mm (8 in.) o.c.
- 400 mm (16 in.) o.c.
- 300 mm (12 in.) o.c.
Show the answer
D. Correct. NBC Part 9 permits screws at 300 mm o.c. on ceilings (400 mm o.c. on walls) when no adhesive is used. Ceilings get the tighter spacing because the board hangs from the fasteners. Keep screws at least 10 mm from board edges and set the head just below the paper without breaking it.
Why not the others
A. 600 mm is a common framing spacing, not a fastener spacing. At 600 mm the board would sag between screws and joints would crack.
B. 200 mm is the NBC spacing for nails, which hold less well than screws. Screws are permitted at wider spacing; using nail spacing is not wrong structurally but is not the answer the code gives for screws.
C. 400 mm o.c. is the screw spacing permitted on walls, not ceilings. A ceiling board carries its own weight on the fasteners and needs them closer together.
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In the attic of a 1970s bungalow you find loose-fill insulation made of small grey-gold, pebble-like flakes that look like vermiculite. The plan is to remove it so new batts can go in. What is the correct first step?
- Mist it with a garden sprayer and shovel it into contractor bags
- Vacuum it out with a shop vacuum so the dust stays contained
- Bag it by hand wearing a dust mask, working from the hatch outward
- Stop, leave it undisturbed and have it sampled and lab-tested for asbestos
Show the answer
D. Correct. Vermiculite from the Libby, Montana mine (sold as Zonolite) frequently contains asbestos fibres. The material must be treated as asbestos-containing until a lab test proves otherwise; disturbing it releases fibres. If it tests positive, removal is done by certified abatement workers under provincial OH&S rules.
Why not the others
A. Wetting reduces dust but does not make untested, possibly asbestos-containing material safe for a carpenter to handle, bag and dispose of. Testing and, if positive, certified abatement comes first.
B. An ordinary shop vacuum passes fine fibres straight through its filter and blows them into the air. Only HEPA equipment used by trained abatement workers is acceptable, and only after testing confirms what the material is.
C. A paper dust mask gives no protection against asbestos fibres, and hand-bagging stirs the material up. The instinct to 'just be careful' misses that the material has to be identified before anyone handles it.
03Answer key
| Question | Answer | Work activity |
|---|---|---|
| Q1 | B | Performs common occupational skills |
| Q2 | B | Performs planning and layout |
| Q3 | A | Performs planning and layout |
| Q4 | B | Performs concrete work |
| Q5 | D | Performs concrete work |
| Q6 | D | Performs framing |
| Q7 | D | Performs framing |
| Q8 | C | Performs exterior finishing |
| Q9 | D | Performs interior finishing |
| Q10 | D | Performs renovations |
04More free questions
The same format for the other five trades, plus the free guides on the pass mark, question counts, exam day and how to study.
How these questions are written and checked: how our questions are made. Found a mistake? Tell us and we will fix it.