CERTIFICATION EXAM QUESTIONS AND CORRECT
ANSWERS (VERIFIED ANSWERS) Q&A 2026
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1. What is the primary cause of mold growth in buildings?
A. Excessive lighting
B. High humidity and moisture
C. Low temperature only
D. Poor insulation alone
Correct Answer: B
Rationale: Mold requires moisture to grow. High humidity,
leaks, and water intrusion are the main contributing factors.
2. Which organism is mold classified as?
A. Bacteria
B. Virus
C. Fungus
D. Algae
Correct Answer: C
Rationale: Mold is a type of fungus that reproduces through
spores.
,3. What is the first step before beginning mold remediation?
A. Apply biocide
B. Paint over mold
C. Conduct a moisture assessment
D. Remove drywall immediately
Correct Answer: C
Rationale: Identifying and controlling the moisture source is
essential before remediation.
4. Which personal protective equipment (PPE) is essential
during mold removal?
A. Sunglasses
B. Respirator mask (N95 or higher)
C. Ear plugs
D. Steel-toe boots only
Correct Answer: B
Rationale: Respirators protect workers from inhaling mold
spores.
5. What is the acceptable humidity level indoors to prevent
mold growth?
A. 80–90%
B. 60–70%
C. 30–50%
D. 10–20%
,Correct Answer: C
Rationale: Indoor humidity should be maintained between 30–
50% to discourage mold growth.
6. What is the most effective method of mold containment?
A. Fans blowing air outward
B. Opening windows
C. Plastic sheeting with negative air pressure
D. Spraying water
Correct Answer: C
Rationale: Containment using plastic barriers and negative air
pressure prevents spore spread.
7. Which tool is used to measure moisture in building
materials?
A. Thermometer
B. Hygrometer
C. Moisture meter
D. Barometer
Correct Answer: C
Rationale: Moisture meters detect water content in materials
like wood and drywall.
, 8. What is the most important factor in preventing mold
regrowth after remediation?
A. Painting walls
B. Removing all furniture
C. Fixing moisture sources
D. Using air fresheners
Correct Answer: C
Rationale: Mold will return if moisture problems are not
corrected.
9. Which type of mold is often associated with severe indoor
air quality concerns?
A. Penicillium
B. Cladosporium
C. Stachybotrys chartarum
D. Aspergillus flavus
Correct Answer: C
Rationale: Stachybotrys chartarum (black mold) is commonly
linked to water-damaged buildings.
10. What is the purpose of HEPA filtration during
remediation?
A. Increase humidity
B. Capture airborne mold spores
C. Dry surfaces