Carpentry & Masonry Trade Knowledge — Practice
Masonry: concrete: practice questions
Our Carpentry & Masonry bank has 13 questions on this topic. Here are 5 of them with answers; the full mock exam draws from every topic, like the real one.
Question 1 · Masonry
What does a bull float do to a fresh slab?
- Cures the slab
- Levels ridges and embeds aggregate after screeding
- Adds texture for traction
- Cuts control joints into the slab while it is still plastic
Show the answer
B. Levels ridges and embeds aggregate after screeding — Floating follows screeding.
Question 2 · Masonry
How much concrete cover is typically required over rebar in footings cast against earth?
- About 1/2 inch
- About 10 inches
- No cover
- About 3 inches
Show the answer
D. About 3 inches — Cover protects steel from corrosion.
Question 3 · Masonry
What is air-entrained concrete used for?
- Making concrete stronger in compression only
- Resisting freeze-thaw damage
- Making concrete set faster
- Coloring concrete
Show the answer
B. Resisting freeze-thaw damage — Tiny bubbles relieve ice pressure.
Question 4 · Masonry
At what age is concrete's specified compressive strength usually measured?
- 1 day
- 1 year
- 7 hours
- 28 days
Show the answer
D. 28 days — Cylinders are tested at 28 days.
Question 5 · Masonry
Why shouldn't a slab be finished while bleed water is on the surface?
- It makes the slab too hard
- Working the water in makes the slab too hard to finish
- It dries too fast
- Working it in weakens the surface and causes scaling and dusting
Show the answer
D. Working it in weakens the surface and causes scaling and dusting — Wait until the sheen disappears.