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.
The CRMI exam has 100 questions and runs 3 hours.
These 10 free CRMI questions are organized by exam domain, so you can see how each part of the Council-certified Residential Mold Inspector blueprint is tested. Reveal the answer and explanation under each question.
Bacterial culture of crawlspace dust produces no colonies, but an endotoxin-specific assay with acceptable interference controls is positive. Which microbial component accounts for the assay result?
Correct answer: D - Lipopolysaccharide from Gram-negative outer membranes
A resident develops recurrent cough, chills, and breathlessness after working in a water-damaged basement. The resident’s pulmonologist diagnoses hypersensitivity pneumonitis. The underlying disease process is best described as:
Correct answer: B - Immune-mediated inflammation of the lungs in a susceptible person.
Mold returns behind a bedroom wardrobe each winter. The affected exterior-wall surface measures 11°C, the nearby exposed wall measures 18°C, and the room air has a dew point of 15°C. Inspection finds no plumbing leak or rainfall-related wetting. Which moisture mechanism best fits this pattern?
Correct answer: C - Surface condensation on the locally cold section of wall
A client points to a cool band on an infrared image of a painted wall and asks how much drywall must be removed. The band has no visible staining and has not been checked with other instruments. What should the inspector do before recommending removal?
Correct answer: C - Check the band with material-appropriate moisture measurements and targeted inspection.
A dark mark remains on painted trim after a repaired leak. Inspection cannot distinguish fungal growth from nonmicrobial staining, and that distinction will determine whether remediation is needed. The intact surface can be sampled without damaging the trim. The most direct way to resolve the question is to:
Correct answer: A - Collect a tape lift from the mark and examine it for fungal structures.
A 10-minute Air-O-Cell sample collected at 15 L/min produces a dense, opaque particle trace. The laboratory reports that debris obscures spore identification. For a repeat sample under comparable conditions, which change best addresses the collection problem?
Correct answer: D - Maintain 15 L/min and shorten the sampling duration.
An air sample is collected at a verified 15 L/min for four minutes. The laboratory counts 42 fungal spores in calibrated traverses representing 20% of the deposited sample trace. These are raw observed counts; no trace-fraction or air-volume correction has been applied. What fungal concentration should be reported?
Correct answer: C - 3,500 spores/m³
Comparable indoor and outdoor spore-trap samples are collected during the same inspection. The bedroom contains 450 total spores/m³, including 400 Aspergillus/Penicillium-like spores/m³. Outdoors, the total is 3,500 spores/m³, dominated by basidiospores, with 30 Aspergillus/Penicillium-like spores/m³. A musty wall below the bedroom window has elevated material-moisture readings. Which conclusion belongs in the report?
Correct answer: B - The fungal profile and localized dampness warrant investigation of an indoor source.
A potable-water supply leak was stopped six hours after it began. The affected, uninsulated interior partition has sound gypsum board, intact seams, no swelling, and no observed mold. The cavity is accessible for drying, and no other contamination is identified. Under EPA clean-water cleanup guidance, what is the least destructive appropriate recommendation?
Correct answer: A - Dry the board in place, ventilate the cavity, and verify material drying.
An employee uses a full-face, negative-pressure air-purifying respirator with P100 filters. An OSHA-accepted quantitative fit test gives an overall fit factor of 640. Medical clearance and the other respiratory-protection program requirements are satisfied. Which combination correctly states the fit-test result and the respirator’s assigned protection factor (APF)?
Correct answer: B - Pass; APF 50 for this respirator class.
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