Docsity
Docsity
Prepare for your exams
Prepare for your exams

Study with the several resources on Docsity

Earn points to download
Earn points to download

Earn points by helping other students or get them with a premium plan

Guidelines and tips
Guidelines and tips
Sell on Docsity
Sell on Docsity
Docsity AI
Docsity AI
Log inSign up

Prepare for your exams

Study with the several resources on Docsity

Find documents

Prepare for your exams with the study notes shared by other students like you on Docsity

Search for your university

Find the specific documents for your university's exams

Docsity AINEW

Summarize your documents, ask them questions, convert them into quizzes and concept maps

Explore questions

Clear up your doubts by reading the answers to questions asked by your fellow students

Earn points to download

Earn points by helping other students or get them with a premium plan

Share documents
download point icon20 Points

For each uploaded document

Answer questions
download point icon5 Points

For each given answer (max 1 per day)

All the ways to get free points
Get points immediately

Choose a premium plan with all the points you need

Study Opportunities

Choose your next study program

Get in touch with the best universities in the world. Search through thousands of universities and official partners

Community

Ask the community

Ask the community for help and clear up your study doubts

Free resources

Our save-the-student-ebooks!

Download our free guides on studying techniques, anxiety management strategies, and thesis advice from Docsity tutors

Nevada C-20 Tile Contractor Exam Practice Questions And Correct Answers (Verified Answer, Exams of Construction

Nevada State CollegeConstruction

Nevada C-20 Tile Contractor Exam Practice Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

Typology: Exams

2025/2026

Available from 04/07/2026

Theexamwhisperer
Theexamwhisperer 🇺🇸

3

(9)

24K documents

1 / 23

Toggle sidebar

This page cannot be seen from the preview

Don't miss anything!

bg1
Nevada C-20 Tile Contractor Exam
Practice Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. Which of the following types of tile is most suitable for high-moisture
areas like bathrooms and showers?
A. Ceramic
B. Porcelain
C. Quarry
D. Terracotta
Porcelain tile is denser and less porous than ceramic or terracotta,
making it highly water-resistant and ideal for wet environments.
2. What is the minimum thickness for ceramic wall tile as per standard
installation practices?
A. 1/8 inch
B. 1/4 inch
C. 3/8 inch
D. 1/2 inch
A 1/4-inch minimum thickness ensures durability and proper
adhesion for wall applications.
3. When installing tile over a plywood subfloor, which underlayment is
recommended?
A. Plywood only
B. Cement board
C. Uncoupling membrane or cement backerboard
D. Vinyl sheet
Cement backerboard or an uncoupling membrane prevents
movement and reduces the risk of tile cracking on wood subfloors.
pf3
pf4
pf5
pf8
pf9
pfa
pfd
pfe
pff
pf12
pf13
pf14
pf15
pf16
pf17

Partial preview of the text

Download Nevada C-20 Tile Contractor Exam Practice Questions And Correct Answers (Verified Answer and more Exams Construction in PDF only on Docsity!

Nevada C-20 Tile Contractor Exam

Practice Questions And Correct Answers

(Verified Answers) Plus Rationales 2026

Q&A | Instant Download Pdf

  1. Which of the following types of tile is most suitable for high-moisture areas like bathrooms and showers? A. Ceramic B. Porcelain C. Quarry D. Terracotta Porcelain tile is denser and less porous than ceramic or terracotta, making it highly water-resistant and ideal for wet environments.
  2. What is the minimum thickness for ceramic wall tile as per standard installation practices? A. 1/8 inch B. 1/4 inch C. 3/8 inch D. 1/2 inch A 1/4-inch minimum thickness ensures durability and proper adhesion for wall applications.
  3. When installing tile over a plywood subfloor, which underlayment is recommended? A. Plywood only B. Cement board C. Uncoupling membrane or cement backerboard D. Vinyl sheet Cement backerboard or an uncoupling membrane prevents movement and reduces the risk of tile cracking on wood subfloors.
  1. What is the primary purpose of using a wet saw when cutting tile? A. To polish edges B. To reduce noise C. To prevent overheating and cracking D. To change color A wet saw keeps the blade cool and reduces dust, minimizing tile cracking and ensuring precise cuts.
  2. Which thin-set mortar type is typically recommended for exterior tile installations? A. Dry-set mortar B. Modified thin-set mortar C. Mastic D. Epoxy adhesive Modified thin-set mortar contains polymers that improve adhesion and flexibility, essential for exterior and moisture-prone areas.
  3. What is the maximum allowable deflection for a floor under tile according to ANSI standards? A. L/ B. L/ C. L/ D. L/ ANSI standards require L/360 deflection for ceramic tile to prevent cracking due to floor movement.
  4. What is the main function of grout in tile installations? A. To support the tile weight B. To waterproof the substrate C. To fill joints and protect edges from damage D. To act as adhesive Grout fills the gaps between tiles, providing structural stability to the surface and protecting edges from chipping.
  5. Which of the following is a characteristic of natural stone tile compared to ceramic tile? A. Uniform size and color B. Low maintenance C. Porous and may require sealing
  1. Which method is best for checking floor flatness before tile installation? A. Using a spirit level only B. Visual inspection C. Using a straightedge and level D. Measuring diagonals only A straightedge and level accurately detect high and low spots, ensuring the floor meets flatness tolerances for tile.
  2. What is the primary risk of using mastic for exterior tile installation? A. Excessive curing time B. Hardening too quickly C. Reduced durability in wet and freeze-thaw conditions D. Staining tile surface Mastic is not suitable for exterior applications because it degrades when exposed to moisture and temperature variations.
  3. When cutting mosaic tile sheets, which tool provides the cleanest cuts? A. Tile nippers B. Utility knife C. Wet saw with a fine blade D. Chisel and hammer A wet saw ensures precise, clean cuts on mosaic tiles, which often have small, fragile pieces.
  4. What is the main purpose of back buttering large-format tiles? A. To reduce tile weight B. To prevent scratching C. To improve mortar coverage and adhesion D. To speed up drying Back buttering applies a thin layer of mortar on the tile back, ensuring full contact and stronger adhesion to the substrate.
  5. Which type of grout is most resistant to cracking and shrinkage? A. Sanded B. Unsanded C. Epoxy grout

D. Cementitious grout Epoxy grout is highly durable, non-porous, and resistant to cracking, making it ideal for high-traffic or wet areas.

  1. How deep should tile be embedded in thin-set mortar for proper adhesion? A. 25% of the tile thickness B. 50% of the tile thickness C. 100% of the tile back coverage D. 75% of the tile thickness Full mortar coverage ensures proper bond strength and prevents hollow spots under the tile.
  2. What is the recommended procedure for installing tile on a concrete slab with a crack? A. Ignore the crack B. Fill with sand C. Use a crack isolation membrane D. Lay tile directly over the crack A crack isolation membrane prevents the crack from telegraphing through the tile surface, reducing cracking risk.
  3. Which of the following is the best method to prevent lippage in tile installation? A. Using a level after installation B. Tapping tiles with a hammer only C. Using leveling spacers during installation D. Cutting tiles after installation Tile leveling systems or spacers ensure uniform height and reduce uneven edges (lippage) between adjacent tiles.
  4. What is the main hazard of cutting tile without water? A. Tile edges chip less B. Faster cutting speed C. Dust inhalation and tile cracking D. Reduced blade wear Dry cutting generates silica dust, which is hazardous to inhale, and increases the risk of tile breakage due to heat.

D. Terracotta Porcelain has very low water absorption, making it resistant to cracking during freeze-thaw cycles.

  1. What is the main function of a wet saw blade with a diamond edge? A. To polish edges B. To reduce water usage C. To cut through hard tile materials cleanly D. To prevent adhesive curing Diamond blades can cut through hard materials like porcelain and natural stone efficiently, providing precise edges.
  2. When is it necessary to seal grout? A. Before curing B. Only in dry areas C. For porous or exterior installations D. Never Sealing grout prevents staining, moisture penetration, and efflorescence, especially in porous or exterior environments.
  3. What is the typical curing time for thin-set mortar before grouting? A. 2–4 hours B. 6–8 hours C. 24 hours D. 48 hours A 24-hour curing period ensures the mortar has set properly, providing full adhesion before grouting.
  4. What is the recommended procedure for installing tile over radiant heating systems? A. Apply tile directly B. Use epoxy only C. Use thin-set mortar rated for radiant heat D. Use mastic Thin-set mortar designed for heated floors ensures proper adhesion without cracking due to thermal expansion.
  1. Which type of tile is generally the heaviest and most difficult to cut? A. Ceramic B. Quarry C. Porcelain D. Vinyl Porcelain is denser and harder than ceramic, requiring special cutting tools like a wet saw with a diamond blade.
  2. What is the minimum slope required for a shower floor tile installation? A. 1/8 inch per foot B. 1/2 inch per foot C. 1/4 inch per foot D. 1 inch per foot A slope of 1/4 inch per foot directs water toward the drain while maintaining proper tile installation.
  3. When installing natural stone tiles, why is it important to use a pH-neutral cleaner? A. To clean faster B. To polish the tile C. To prevent etching or damage D. To change color Acidic or alkaline cleaners can etch natural stone surfaces, so a pH- neutral cleaner preserves the stone finish.
  4. What is the recommended spacing for grout joints in large- format tiles? A. 1/16–1/8 inch B. 1/4–3/8 inch C. 1/8–1/4 inch D. 3/8–1/2 inch Larger tiles require slightly wider grout joints to accommodate size variations and allow for proper expansion.
  5. Which of the following best describes a crack isolation membrane? A. Adhesive layer only
  1. What is the purpose of using a grout release or sealer before installation of natural stone tiles? A. To improve adhesion B. To reduce mortar curing time C. To prevent grout staining and facilitate cleaning D. To waterproof the substrate Grout release prevents grout from permanently staining porous stone, simplifying cleanup and preserving the finish.
  2. What is the recommended procedure for mixing thin-set mortar? A. Add water and stir quickly B. Use pre-mixed adhesive only C. Follow manufacturer’s instructions for water ratio and mix thoroughly D. Mix with minimal water for thicker consistency Correct water-to-mortar ratio ensures proper adhesion, workability, and curing of the mortar.
  3. Which factor primarily affects the curing time of mortar and grout? A. Tile color B. Tile size C. Temperature and humidity D. Substrate type Environmental conditions like temperature and humidity significantly influence the curing rate of mortar and grout.
  4. What is the purpose of a keying trowel when installing plaster or mortar? A. To cut tiles B. To polish tile C. To create grooves for better adhesion D. To measure thickness Grooves or keys in the mortar provide mechanical bonding for tiles or plaster, enhancing adhesion.
  5. Which of the following is a common cause of tile lippage? A. Using epoxy grout

B. Uneven substrate or tile thickness variation C. Insufficient thin-set coverage only D. Overwatering grout Lippage occurs when adjacent tiles are not level, often due to substrate irregularities or inconsistent tile thickness.

  1. When installing tile outdoors, which environmental factor must be considered? A. Color of tile only B. Substrate type only C. Temperature fluctuations and freeze-thaw cycles D. Grout color only Outdoor installations must account for expansion, contraction, and freeze-thaw cycles to prevent tile damage.
  2. Which type of tile adhesive is recommended for installing glass mosaic tiles? A. Mastic B. White thin-set mortar C. Epoxy grout only D. Unmodified mortar White thin-set mortar prevents discoloration through translucent glass tiles and provides strong adhesion.
  3. What is the recommended procedure to prevent efflorescence on new tile installations? A. Seal tiles immediately B. Use colored grout only C. Allow mortar and grout to cure fully and use proper waterproofing D. Avoid cleaning tiles Efflorescence results from soluble salts in mortar migrating to the surface; proper curing and waterproofing reduce this effect.
  4. Which of the following is required by Nevada law for a C-20 Tile Contractor? A. Only hand tool knowledge B. No licensing required C. Valid state C-20 contractor license D. OSHA certification only

A. To speed up mortar drying B. To polish tile edges C. To maintain consistent grout joint width D. To secure tiles permanently Spacers ensure uniform spacing between tiles, which is essential for consistent grout lines and aesthetic appeal.

  1. Which tool is recommended for cutting curved shapes in tile? A. Wet saw B. Chisel only C. Tile nippers or a wet saw with a diamond blade D. Utility knife Tile nippers allow precise cutting of small curves and irregular shapes, while a wet saw can also make controlled curved cuts.
  2. For a thin-set installation on a concrete slab, what is the maximum moisture content allowed? A. 5% B. 8% C. 12% D. 15% Concrete moisture should not exceed 12% to prevent adhesive failure and future tile delamination.
  3. Which is the proper method to ensure proper slope in a shower pan? A. Visual inspection B. Using a laser level or straightedge C. Slope of 1/4 inch per foot toward the drain D. Matching the tile thickness A 1/4-inch per foot slope ensures water drains effectively and prevents pooling in shower areas.
  4. What is a common cause of grout cracking? A. Using epoxy grout B. Substrate movement or insufficient joint width C. Excessive tile size D. Using sanded grout only

Grout cracks when there is movement in the substrate or when expansion/contraction joints are missing or too narrow.

  1. When installing tile over existing vinyl, which preparation step is required? A. Remove only top layer B. Lay mortar directly C. Remove loose or damaged vinyl and roughen the surface D. Seal vinyl with epoxy A sound, roughened surface ensures proper adhesion of thin-set mortar over the existing vinyl.
  2. Which type of tile is most suitable for heavy commercial traffic? A. Ceramic wall tile B. Porcelain floor tile C. Mosaic glass tile D. Terracotta Porcelain floor tiles are dense, durable, and resistant to wear, making them ideal for high-traffic areas.
  3. What is the minimum spacing recommended for grout joints in wall installations? A. 1/32 inch B. 1/16 inch C. 1/8 inch D. 1/4 inch A minimum of 1/8 inch allows for grout penetration and compensates for minor tile size variations.
  4. Which type of mortar is recommended for exterior stone veneer tiles? A. Mastic B. Polymer-modified thin-set mortar C. Dry-set mortar only D. Cement paste Polymer-modified thin-set provides better adhesion and flexibility, critical for exterior applications subject to weather changes.
  5. What is the recommended method to avoid tile cracking on plywood subfloors?

D. Install tiles immediately after mixing mortar Efflorescence occurs from soluble salts; proper curing and waterproofing minimize salt migration to the surface.

  1. What is the maximum recommended slope for a tiled shower curb? A. 1 inch per foot B. 1/4 inch per foot toward shower pan C. 1/2 inch per foot D. 3/8 inch per foot A 1/4-inch per foot slope ensures water flows away from the curb without pooling.
  2. What is the primary purpose of sealing natural stone tiles? A. To improve adhesion B. To change color C. To protect against stains and moisture penetration D. To reduce weight Sealing prevents water, oils, and other contaminants from penetrating porous stone surfaces.
  3. Which type of joint is recommended between tile and vertical surfaces like walls or columns? A. Butt joint only B. Expansion joint or caulked joint C. Grout only D. No joint needed Expansion joints allow for thermal movement and prevent cracking along rigid connections.
  4. When installing porcelain tiles on a concrete slab with radiant heat, which adhesive should be used? A. Mastic B. Dry-set mortar C. Thin-set mortar rated for heated floors D. Epoxy only Thin-set mortar designed for radiant heat prevents adhesive failure due to thermal expansion and contraction.
  1. Which method is best for leveling uneven tiles during installation? A. Using a spirit level only B. Tile leveling clips and wedges C. Tapping with a hammer D. Visual inspection Leveling clips and wedges help maintain uniform height, reducing lippage and unevenness.
  2. Which of the following is a key consideration when selecting tile for exterior use? A. Color only B. Size only C. Water absorption and freeze-thaw resistance D. Grout type only Tiles for outdoor use must resist water absorption and withstand freeze-thaw cycles to prevent cracking.
  3. What is the recommended procedure for cutting small mosaic tiles? A. Wet saw only B. Tile nippers C. Chisel only D. Utility knife Tile nippers allow precision cuts for small or irregular mosaic tiles without damaging surrounding pieces.
  4. Which is a common cause of hollow spots under tiles? A. Over-grouting B. Insufficient thin-set coverage or improper trowel technique C. Using epoxy grout D. Installing large-format tiles only Incomplete mortar coverage leaves voids beneath tiles, which can cause cracking or hollow sounds.
  5. Which type of trowel notch is recommended for mosaic sheets on walls? A. 1/2 inch square B. 1/4 inch square
  1. What is the typical thickness of a cement backerboard used for wall tile installation? A. 1/8 inch B. 1/4 inch C. 1/2 inch D. 3/4 inch A 1/2-inch backerboard provides adequate support and rigidity for wall tile applications.
  2. Which of the following tools is used to remove excess grout from the tile surface? A. Margin trowel B. Notched trowel C. Rubber float D. Wet saw A rubber float effectively removes and smooths grout without scratching the tile.
  3. Which of the following is a common method to ensure full thin- set coverage under large-format tiles? A. Spread mortar thinly B. Use epoxy adhesive only C. Back-butter the tile in addition to troweling D. Lay tile directly without mortar Back-buttering ensures 100% contact between mortar and tile, reducing voids and enhancing adhesion.
  4. Which type of tile is most suitable for pool decks? A. Ceramic wall tile B. Quarry tile or slip-resistant porcelain C. Glass mosaic D. Terracotta only Slip-resistant tiles like quarry or porcelain are durable and safe for wet areas like pool decks.
  5. Which is a proper method to prevent cracking in large-format tiles? A. Thin mortar application only B. Full mortar coverage and proper substrate preparation

C. No expansion joints D. Quick drying with heat Proper substrate preparation and full mortar coverage distribute load and prevent cracks in large tiles.

  1. When installing tile in a high-humidity area, what is critical to prevent mold growth? A. Use colored grout B. Polish tiles C. Waterproof membrane and proper ventilation D. Install epoxy only Moisture control with waterproofing and ventilation prevents mold growth behind and between tiles.
  2. Which of the following is true about mastic adhesive? A. Suitable for exterior floors B. Best for dry interior walls only C. Resists freeze-thaw D. Provides structural support Mastic is not water-resistant and should only be used in dry interior applications.
  3. When installing tile on concrete that has minor cracks, what is recommended? A. Cover cracks directly B. Ignore cracks C. Use crack isolation membrane D. Use thicker grout only Crack isolation membranes prevent existing cracks from reflecting through the tile, reducing damage.
  4. What is the function of a notched trowel in tile installation? A. To polish tiles B. To remove grout C. To spread mortar evenly and create ridges D. To cut tiles Notched trowels ensure uniform mortar thickness and proper adhesion by creating ridges that collapse under tile.