Page 1 of 89
LE & MARBLE CONTRACTOR PRACTICE
EXAM|QUESTIONS AND ANSWERS WITH
RATIONALE|GRADED A+|2026
UPDATE|100% CORRECT
1. Which of the following is the most common type of ceramic
tile used in residential flooring?
A) Quarry tile
B) Porcelain tile
C) Terracotta
D) Saltillo tile
Answer: B
Rationale: Porcelain tile is a type of ceramic tile with water
absorption ≤0.5%, making it denser and more durable than non-
,Page 2 of 89
porcelain ceramic. It is widely used in residential and commercial
flooring.
2. The PEI (Porcelain Enamel Institute) rating of a tile indicates
its:
A) Water absorption rate
B) Resistance to abrasion and durability for floor traffic
C) Coefficient of friction
D) Chemical resistance
Answer: B
Rationale: PEI ratings (Class 1–5) classify glazed tile's resistance
to surface wear and foot traffic. Class 5 is heaviest commercial,
Class 1 is light residential wall use only.
3. A tile with a water absorption rate greater than 7% is
classified as:
A) Impervious
,Page 3 of 89
B) Vitreous
C) Semi-vitreous
D) Non-vitreous
Answer: D
Rationale: Water absorption classifications: Impervious (≤0.5%),
Vitreous (0.5–3%), Semi-vitreous (3–7%), Non-vitreous (>7%).
Non-vitreous tile is not frost-resistant.
4. Which natural stone is metamorphic, highly durable, and
resistant to acids, making it suitable for kitchen countertops?
A) Marble
B) Limestone
C) Granite
D) Slate
Answer: C
Rationale: Granite is an igneous/metamorphic stone, very hard,
, Page 4 of 89
acid-resistant (unlike marble which etches with acid). It is ideal
for kitchen counters.
5. Marble is primarily composed of:
A) Silica
B) Calcite (calcium carbonate)
C) Feldspar
D) Quartzite
Answer: B
Rationale: Marble is metamorphosed limestone, composed
mainly of calcite. It is softer than granite and reacts with acids
(etching), requiring sealing.
6. A contractor is installing glass tile in a shower. Which
property of glass tile requires special installation
consideration?
A) High porosity
LE & MARBLE CONTRACTOR PRACTICE
EXAM|QUESTIONS AND ANSWERS WITH
RATIONALE|GRADED A+|2026
UPDATE|100% CORRECT
1. Which of the following is the most common type of ceramic
tile used in residential flooring?
A) Quarry tile
B) Porcelain tile
C) Terracotta
D) Saltillo tile
Answer: B
Rationale: Porcelain tile is a type of ceramic tile with water
absorption ≤0.5%, making it denser and more durable than non-
,Page 2 of 89
porcelain ceramic. It is widely used in residential and commercial
flooring.
2. The PEI (Porcelain Enamel Institute) rating of a tile indicates
its:
A) Water absorption rate
B) Resistance to abrasion and durability for floor traffic
C) Coefficient of friction
D) Chemical resistance
Answer: B
Rationale: PEI ratings (Class 1–5) classify glazed tile's resistance
to surface wear and foot traffic. Class 5 is heaviest commercial,
Class 1 is light residential wall use only.
3. A tile with a water absorption rate greater than 7% is
classified as:
A) Impervious
,Page 3 of 89
B) Vitreous
C) Semi-vitreous
D) Non-vitreous
Answer: D
Rationale: Water absorption classifications: Impervious (≤0.5%),
Vitreous (0.5–3%), Semi-vitreous (3–7%), Non-vitreous (>7%).
Non-vitreous tile is not frost-resistant.
4. Which natural stone is metamorphic, highly durable, and
resistant to acids, making it suitable for kitchen countertops?
A) Marble
B) Limestone
C) Granite
D) Slate
Answer: C
Rationale: Granite is an igneous/metamorphic stone, very hard,
, Page 4 of 89
acid-resistant (unlike marble which etches with acid). It is ideal
for kitchen counters.
5. Marble is primarily composed of:
A) Silica
B) Calcite (calcium carbonate)
C) Feldspar
D) Quartzite
Answer: B
Rationale: Marble is metamorphosed limestone, composed
mainly of calcite. It is softer than granite and reacts with acids
(etching), requiring sealing.
6. A contractor is installing glass tile in a shower. Which
property of glass tile requires special installation
consideration?
A) High porosity
