10 exam-style questions with answers and explanations, straight from our 1,030-question bank. Tap an answer to check yourself. When you're ready, take the scored version in the free practice test.
A lemon garnish is left on an uncoated, polished marble counter. After the area is cleaned with a stone-safe detergent, rinsed, and dried, a pale, dull patch remains in the shape of the garnish. There is no raised deposit or transferable residue. What most likely happened to the surface?
Correct answer: C - Acid etched the marble and altered the polished surface.
A flat scrubbing pad cleans the raised faces of textured porcelain tile but leaves soil in the recesses and low grout joints. The approved cleaner has been used at the correct dilution and dwell time. Hand-brushing removes the remaining soil without changing the finish. For the rest of the floor, which equipment change addresses the limitation demonstrated by this test?
Correct answer: A - Use a compatible bristle brush that reaches the recessed surfaces.
During a clean-water test on an intact porcelain-tile floor, the unsealed cementitious grout darkens while the tile faces show little change. The grout returns to its original color after complete drying. No cracks, soft joints, or persistent dampness are found. The owner asks whether the color change means the grout must be replaced. The appropriate response is to:
Correct answer: D - Continue cleaning; the reversible darkening reflects grout porosity.
An owner asks what a correctly applied penetrating sealer will do for a natural-stone floor. Which expectation is reasonable?
Correct answer: B - It improves stain resistance, but spills still need prompt cleanup.
A rust remover contains hydrofluoric acid. A technician proposes using it on granite, reasoning that granite generally resists acids better than limestone. How should this proposal be evaluated?
Correct answer: B - Hydrofluoric acid can attack granite itself, not just the rust deposit.
An alkaline cleaner is approved for a restaurant's porcelain tile and cementitious grout. Its label specifies, by volume, one part concentrate plus 63 parts water for routine soil, or one part concentrate plus 15 parts water for heavy grease. After loose debris is removed, thick, tacky cooking-oil deposits remain. To prepare exactly 8 L of the appropriate working solution, combine:
Correct answer: D - 500 mL concentrate with 7.500 L water.
The manufacturer identifies a vanity top as gel-coated cultured marble. A technician is considering the diamond-abrasive procedure used on solid natural marble to remove a dull patch. Which material distinction matters before specifying that treatment?
Correct answer: A - The exposed finish is a resin coating rather than a solid natural-stone surface.
An automatic scrubber loosens dirt from a ceramic floor but leaves a continuous wet film behind it. The squeegee is lowered, yet very little liquid reaches the recovery tank. The cleaner is correctly diluted and there is no excess foam. Which part of the machine should be checked first?
Correct answer: C - The vacuum path, recovery-hose connections, and squeegee contact with the floor.
While cleaning a small tiled washroom, a worker pours an acidic descaler into a bucket that still contains chlorine bleach solution. A sharp odor develops and another worker starts coughing. What takes priority over dealing with the bucket?
Correct answer: B - Get everyone to fresh air and call emergency services from safety.
White crystalline deposits on an interior brick wall brush off when dry but return after each period of wet weather. An inspection finds rain entering through defective exterior flashing. The contractor has been asked to prevent another callback, not merely improve the wall's appearance. Which intervention addresses the recurring efflorescence?
Correct answer: A - Repair the water entry and allow the masonry to dry.
The Stone, Masonry and Ceramic Tile Cleaning Technician (SMT) (SMT) exam is organized into 1 knowledge domains. These free practice questions are drawn from across them so you can see where you're strong and where to study:
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