Exam Practice Test Questions And Correct

Mold Remediation Contractor Certification Exam Practice Test Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

• What is the most common indoor mold found in water-damaged

buildings?

• Cladosporium
• Penicillium
• Aspergillus
• Stachybotrys

Rationale: Aspergillus is one of the most commonly found molds in

indoor environments, especially in dust and on damp surfaces.

• Which humidity level generally supports mold growth indoors?

A. 30%

B. 40%

C. 60% 1 / 4

D. 20%

Rationale: Mold thrives in environments where relative humidity

exceeds 55–60%.

• Which of the following personal protective equipment (PPE) is

essential during mold remediation?

• Gloves, respirator, goggles
• Gloves, respirator, goggles, disposable coveralls
• Gloves only
• Respirator only

Rationale: Full PPE, including gloves, respirator, goggles, and

disposable coveralls, is required to prevent exposure to mold spores.

• What is the first step in a mold remediation project?
• Apply biocides
• Identify and contain the mold-affected area
• Remove all furnishings
• Begin cleaning immediately

Rationale: Containment is critical to prevent the spread of mold

spores to unaffected areas.

• Which type of respirator is recommended for most mold remediation

work?

• Surgical mask
• Half-mask with particulate filter P95
• NIOSH-approved N95 or higher 2 / 4

• Dust mask

Rationale: N95 or higher respirators effectively filter airborne mold

spores.

• What is the primary cause of mold growth indoors?
• Poor ventilation
• Moisture intrusion or water damage
• Dust accumulation
• High temperature

Rationale: Mold requires moisture to grow, so water intrusion is the

primary factor.

• Which of the following materials cannot be effectively cleaned if mold

is present?

• Metal
• Porous materials like drywall or carpet
• Glass
• Plastic

Rationale: Porous materials absorb moisture and mold, making

complete remediation difficult.

• What is the proper containment method for small mold remediation

jobs?

• Entire building containment
• Use of polyethylene sheeting and negative air pressure in the

affected area 3 / 4

• Closing doors only
• Spraying disinfectant

Rationale: Localized containment with negative air pressure prevents

spores from spreading.

• How long should HEPA vacuuming be performed on a mold-affected

area?

• 5 minutes
• Until visible mold is removed
• Until no dust or visible mold remains
• It is optional

Rationale: HEPA vacuuming removes residual spores and dust to

reduce contamination risk.

• What is the recommended method for cleaning non-porous

surfaces contaminated with mold?

• Scrubbing with water only
• Scrubbing with detergent and water, then drying
• Applying bleach without scrubbing
• Using an air blower

Rationale: Detergent and water remove mold from non-porous

surfaces effectively, followed by proper drying.

• Which type of mold is often referred to as “black mold”?
• Aspergillus
• Cladosporium
• / 4