Nevada [NV] C-20 Tiling [Contractor]
Exam Questions And Correct Answers
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1. What is the primary purpose of surface preparation in tiling?
A) Enhancing the tile color
B) Ensuring proper adhesion of tiles
C) Reducing the cost of materials
D) Increasing the installation speed
Correct Answer: B
Explanation: Proper surface preparation creates a clean, stable, and level substrate,
which is essential for the tile adhesive to form a durable and long-lasting bond.
2. Which tool is commonly used to check the levelness of a surface before tiling?
A) Measuring tape
B) Spirit level
C) Hammer
D) Screwdriver
Correct Answer: B
Explanation: A spirit level, also known as a bubble level, is the standard tool used to
verify that a surface is horizontally level or vertically plumb.
3. What is the first step in identifying surface imperfections?
A) Applying adhesive
B) Cleaning the surface
,C) Visual inspection
D) Laying out tiles
Correct Answer: C
Explanation: A thorough visual inspection is the initial and most critical step to identify
cracks, uneven areas, moisture issues, and other imperfections before any preparation
work begins.
4. Which of the following is a common surface imperfection that affects tiling?
A) Excessive sunlight
B) Surface cracks
C) High humidity
D) Loud noises
Correct Answer: B
Explanation: Surface cracks in the substrate can telegraph through the finished tile
work or lead to movement, resulting in cracked tiles or grout lines.
5. What material is typically used to fill minor cracks in a substrate before tiling?
A) Epoxy
B) Grout
C) Joint compound
D) Leveling compound
Correct Answer: D
Explanation: Leveling compounds are designed to fill minor cracks, holes, and
depressions, creating a smooth and even surface suitable for tile installation.
6. Why is it important to remove existing adhesives or coatings from the
substrate?
A) To save on material costs
B) To ensure better tile adhesion
C) To make the surface rougher
D) It is not important
Correct Answer: B
,Explanation: Old adhesives, paints, or sealers can act as bond breakers, preventing new
thinset or mortar from adhering properly to the substrate.
7. What is the calcium chloride test used for?
A) Testing concrete compressive strength
B) Measuring the moisture vapor emission rate of concrete
C) Determining the pH level of a slab
D) Checking for cracks in the slab
Correct Answer: B
Explanation: The calcium chloride test is a standard method (ASTM F1869) to quantify
the amount of moisture vapor emitting from a concrete slab, which is critical for
specifying flooring adhesives.
8. What is the primary cause of efflorescence on tiled surfaces?
A) Excessive tile thickness
B) Moisture migration through the substrate
C) High-temperature environments
D) Overuse of adhesive
Correct Answer: B
Explanation: Efflorescence is a white, powdery deposit caused by water-soluble salts
migrating to the surface as moisture moves through the substrate and evaporates.
9. How can efflorescence be prevented during surface preparation?
A) Increasing tile size
B) Using waterproof membranes
C) Applying more adhesive
D) Installing tiles faster
Correct Answer: B
Explanation: Waterproofing and crack-isolation membranes block the migration of
moisture and dissolved salts from the substrate to the tile surface, preventing
efflorescence.
, 10. What is the effect of high moisture content on tile adhesive?
A) Improves adhesion
B) Has no effect
C) Weakens the adhesive bond
D) Changes tile color
Correct Answer: C
Explanation: Excess moisture can interfere with the curing process of cementitious
adhesives or re-emulsify water-based organics, leading to a weakened or failed bond.
11. Which of the following is NOT a common method to rectify surface moisture
issues?
A) Installing a vapor barrier
B) Using moisture-resistant adhesives
C) Ignoring the moisture
D) Improving ventilation
Correct Answer: C
Explanation: Ignoring moisture issues will almost certainly lead to installation failure;
the source of the moisture must be addressed with appropriate methods.
12. According to Nevada building codes, what must be installed to prevent
moisture transmission in shower receptor areas?
A) A vapor retarder
B) An extra layer of drywall
C) A slip sheet of roofing felt
D) A waterproof membrane
Correct Answer: D
Explanation: A waterproof membrane is required by code in shower receptors and wet
areas to contain water and prevent it from penetrating the underlying structure.
13. Which of the following indicates a surface is not properly prepared for tiling?
A) Smooth texture
B) Level surface
Exam Questions And Correct Answers
|100% Verified |Guaranteed Success |
update
1. What is the primary purpose of surface preparation in tiling?
A) Enhancing the tile color
B) Ensuring proper adhesion of tiles
C) Reducing the cost of materials
D) Increasing the installation speed
Correct Answer: B
Explanation: Proper surface preparation creates a clean, stable, and level substrate,
which is essential for the tile adhesive to form a durable and long-lasting bond.
2. Which tool is commonly used to check the levelness of a surface before tiling?
A) Measuring tape
B) Spirit level
C) Hammer
D) Screwdriver
Correct Answer: B
Explanation: A spirit level, also known as a bubble level, is the standard tool used to
verify that a surface is horizontally level or vertically plumb.
3. What is the first step in identifying surface imperfections?
A) Applying adhesive
B) Cleaning the surface
,C) Visual inspection
D) Laying out tiles
Correct Answer: C
Explanation: A thorough visual inspection is the initial and most critical step to identify
cracks, uneven areas, moisture issues, and other imperfections before any preparation
work begins.
4. Which of the following is a common surface imperfection that affects tiling?
A) Excessive sunlight
B) Surface cracks
C) High humidity
D) Loud noises
Correct Answer: B
Explanation: Surface cracks in the substrate can telegraph through the finished tile
work or lead to movement, resulting in cracked tiles or grout lines.
5. What material is typically used to fill minor cracks in a substrate before tiling?
A) Epoxy
B) Grout
C) Joint compound
D) Leveling compound
Correct Answer: D
Explanation: Leveling compounds are designed to fill minor cracks, holes, and
depressions, creating a smooth and even surface suitable for tile installation.
6. Why is it important to remove existing adhesives or coatings from the
substrate?
A) To save on material costs
B) To ensure better tile adhesion
C) To make the surface rougher
D) It is not important
Correct Answer: B
,Explanation: Old adhesives, paints, or sealers can act as bond breakers, preventing new
thinset or mortar from adhering properly to the substrate.
7. What is the calcium chloride test used for?
A) Testing concrete compressive strength
B) Measuring the moisture vapor emission rate of concrete
C) Determining the pH level of a slab
D) Checking for cracks in the slab
Correct Answer: B
Explanation: The calcium chloride test is a standard method (ASTM F1869) to quantify
the amount of moisture vapor emitting from a concrete slab, which is critical for
specifying flooring adhesives.
8. What is the primary cause of efflorescence on tiled surfaces?
A) Excessive tile thickness
B) Moisture migration through the substrate
C) High-temperature environments
D) Overuse of adhesive
Correct Answer: B
Explanation: Efflorescence is a white, powdery deposit caused by water-soluble salts
migrating to the surface as moisture moves through the substrate and evaporates.
9. How can efflorescence be prevented during surface preparation?
A) Increasing tile size
B) Using waterproof membranes
C) Applying more adhesive
D) Installing tiles faster
Correct Answer: B
Explanation: Waterproofing and crack-isolation membranes block the migration of
moisture and dissolved salts from the substrate to the tile surface, preventing
efflorescence.
, 10. What is the effect of high moisture content on tile adhesive?
A) Improves adhesion
B) Has no effect
C) Weakens the adhesive bond
D) Changes tile color
Correct Answer: C
Explanation: Excess moisture can interfere with the curing process of cementitious
adhesives or re-emulsify water-based organics, leading to a weakened or failed bond.
11. Which of the following is NOT a common method to rectify surface moisture
issues?
A) Installing a vapor barrier
B) Using moisture-resistant adhesives
C) Ignoring the moisture
D) Improving ventilation
Correct Answer: C
Explanation: Ignoring moisture issues will almost certainly lead to installation failure;
the source of the moisture must be addressed with appropriate methods.
12. According to Nevada building codes, what must be installed to prevent
moisture transmission in shower receptor areas?
A) A vapor retarder
B) An extra layer of drywall
C) A slip sheet of roofing felt
D) A waterproof membrane
Correct Answer: D
Explanation: A waterproof membrane is required by code in shower receptors and wet
areas to contain water and prevent it from penetrating the underlying structure.
13. Which of the following indicates a surface is not properly prepared for tiling?
A) Smooth texture
B) Level surface
