,1. What is the recommended pH level for a cleaning
solution used on natural stone surfaces?
- A) 0-4
- B) 4-7
- C) 7-10
- D) 10-14
Correct Answer: B) 4-7
Rationale: Natural stone surfaces are sensitive to highly
acidic or alkaline solutions. A pH-neutral solution (4-7) is
gentle and effective for cleaning without causing damage.
2. Which of the following is NOT a safe practice when
cleaning cultured stone?
- A) Using a high-pressure washer
- B) Applying a mild detergent
- C) Utilizing a soft-bristled brush
- D) Rinsing with clean water
Correct Answer: A) Using a high-pressure washer
Rationale: High-pressure washers can erode the surface
of cultured stone, leading to damage. Gentle cleaning
methods are recommended.
4. What is the primary reason for sealing grout in a tiling
application?
- A) To enhance the color of the grout
- B) To protect against mechanical damage
- C) To prevent moisture absorption and staining
- D) To speed up the curing process
Correct Answer: C) To prevent moisture absorption and
staining
Rationale: Sealing grout helps to create a barrier against
moisture and stains, preserving the appearance and
integrity of the grout.
5. Which cleaning technique is most appropriate for
removing oil-based stains from masonry?
- A) Steam cleaning
- B) Sandblasting
- C) Poulticing
- D) Scrubbing with soap and water
Correct Answer: C) Poulticing
Rationale: A poultice is effective for drawing out oil-based
stains from porous masonry materials without causing
surface damage.
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