Tile Contractor Exam (C-54) Questions
and Correct Answers (Verified Answers)
Plus Rationales 2025 Q&A | Instant
Download PDF
Question 1
Before installing ceramic tile, the substrate should primarily be:
A. Wet
B. Clean and stable
C. Painted
D. Covered with plastic
Correct Answer: B. Clean and stable
Rationale: A tile installation depends on a sound substrate. Dirt, grease, dust, and
movement reduce bond strength and can cause tile failure.
Question 2
Which tool is most commonly used to spread thin-set mortar?
A. Float
B. Margin trowel
C. Notched trowel
D. Brick hammer
Correct Answer: C. Notched trowel
Rationale: A notched trowel creates uniform mortar ridges that provide proper
coverage beneath the tile.
,Question 3
Porcelain tile is best known for being:
A. Highly absorbent
B. Less durable than ceramic
C. Dense and water-resistant
D. Made only for walls
Correct Answer: C. Dense and water-resistant
Rationale: Porcelain tile has very low water absorption and excellent durability,
making it suitable for interior and exterior installations.
Question 4
The purpose of grout is to:
A. Bond tile to the substrate
B. Fill joints between tiles
C. Waterproof the floor by itself
D. Replace thin-set mortar
Correct Answer: B. Fill joints between tiles
Rationale: Grout fills spaces between tiles, protects edges, and improves the
finished appearance. It does not replace mortar.
Question 5
Which substrate is commonly used behind tile in wet areas?
A. Drywall
B. Particleboard
C. Cement backer board
D. Plywood siding
Correct Answer: C. Cement backer board
,Rationale: Cement backer board resists moisture and provides a stable base for
tile installations.
Question 6
What is the primary purpose of tile spacers?
A. Increase mortar strength
B. Create uniform grout joints
C. Waterproof the installation
D. Polish tile edges
Correct Answer: B. Create uniform grout joints
Rationale: Tile spacers ensure consistent spacing, producing straight and even
grout joints.
Question 7
A mortar bed is mainly used to:
A. Paint tile
B. Level and support tile
C. Seal grout
D. Polish natural stone
Correct Answer: B. Level and support tile
Rationale: Mortar beds provide a flat, durable surface for tile installation and help
correct uneven substrates.
Question 8
Which material is commonly used for bonding ceramic tile?
A. Joint compound
B. Thin-set mortar
, C. Roofing cement
D. Asphalt
Correct Answer: B. Thin-set mortar
Rationale: Thin-set mortar is specifically formulated to bond tile securely to
approved substrates.
Question 9
Unsanded grout is generally used for grout joints that are:
A. Wide
B. Over 1 inch
C. Narrow
D. Outdoors only
Correct Answer: C. Narrow
Rationale: Unsanded grout is designed for narrow joints because it packs
smoothly without scratching delicate tile.
Question 10
Expansion joints are installed to:
A. Increase grout color
B. Allow movement
C. Improve tile shine
D. Reduce mortar use
Correct Answer: B. Allow movement
Rationale: Expansion joints accommodate building movement and reduce the risk
of cracked tiles or grout.
Question 11
and Correct Answers (Verified Answers)
Plus Rationales 2025 Q&A | Instant
Download PDF
Question 1
Before installing ceramic tile, the substrate should primarily be:
A. Wet
B. Clean and stable
C. Painted
D. Covered with plastic
Correct Answer: B. Clean and stable
Rationale: A tile installation depends on a sound substrate. Dirt, grease, dust, and
movement reduce bond strength and can cause tile failure.
Question 2
Which tool is most commonly used to spread thin-set mortar?
A. Float
B. Margin trowel
C. Notched trowel
D. Brick hammer
Correct Answer: C. Notched trowel
Rationale: A notched trowel creates uniform mortar ridges that provide proper
coverage beneath the tile.
,Question 3
Porcelain tile is best known for being:
A. Highly absorbent
B. Less durable than ceramic
C. Dense and water-resistant
D. Made only for walls
Correct Answer: C. Dense and water-resistant
Rationale: Porcelain tile has very low water absorption and excellent durability,
making it suitable for interior and exterior installations.
Question 4
The purpose of grout is to:
A. Bond tile to the substrate
B. Fill joints between tiles
C. Waterproof the floor by itself
D. Replace thin-set mortar
Correct Answer: B. Fill joints between tiles
Rationale: Grout fills spaces between tiles, protects edges, and improves the
finished appearance. It does not replace mortar.
Question 5
Which substrate is commonly used behind tile in wet areas?
A. Drywall
B. Particleboard
C. Cement backer board
D. Plywood siding
Correct Answer: C. Cement backer board
,Rationale: Cement backer board resists moisture and provides a stable base for
tile installations.
Question 6
What is the primary purpose of tile spacers?
A. Increase mortar strength
B. Create uniform grout joints
C. Waterproof the installation
D. Polish tile edges
Correct Answer: B. Create uniform grout joints
Rationale: Tile spacers ensure consistent spacing, producing straight and even
grout joints.
Question 7
A mortar bed is mainly used to:
A. Paint tile
B. Level and support tile
C. Seal grout
D. Polish natural stone
Correct Answer: B. Level and support tile
Rationale: Mortar beds provide a flat, durable surface for tile installation and help
correct uneven substrates.
Question 8
Which material is commonly used for bonding ceramic tile?
A. Joint compound
B. Thin-set mortar
, C. Roofing cement
D. Asphalt
Correct Answer: B. Thin-set mortar
Rationale: Thin-set mortar is specifically formulated to bond tile securely to
approved substrates.
Question 9
Unsanded grout is generally used for grout joints that are:
A. Wide
B. Over 1 inch
C. Narrow
D. Outdoors only
Correct Answer: C. Narrow
Rationale: Unsanded grout is designed for narrow joints because it packs
smoothly without scratching delicate tile.
Question 10
Expansion joints are installed to:
A. Increase grout color
B. Allow movement
C. Improve tile shine
D. Reduce mortar use
Correct Answer: B. Allow movement
Rationale: Expansion joints accommodate building movement and reduce the risk
of cracked tiles or grout.
Question 11
