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 MRS exam has 100 questions and runs 2 hours.
These 10 free MRS questions are organized by exam domain, so you can see how each part of the Mold Remediation Specialist (MRS) blueprint is tested. Reveal the answer and explanation under each question.
Quantitative fit testing under an OSHA-accepted protocol produces an overall fit factor of 160 for a worker's half-mask air-purifying respirator and 360 for a full-facepiece model. The exposure assessment permits either type if it passes fit testing. Which respirator has met its required fit criterion?
Correct answer: A - The half-mask only; the full-facepiece has not met its fit-test criterion.
Shortly after a negative-air machine begins exhausting from a basement, a carbon monoxide alarm sounds near an operating natural-draft water heater. A worker reports headache and nausea. What is the immediate priority?
Correct answer: D - Evacuate the building and call emergency services from outside.
Today's cleaning operation presents both airborne mold particles and a known organic vapor from a cleaning agent. After evaluating engineering controls and exposure levels, the respiratory-program administrator authorizes a half-mask air-purifying respirator with protection against both hazards. Oxygen is normal, and the worker is medically cleared and fit-tested. Which filter or cartridge arrangement satisfies that selection?
Correct answer: B - A NIOSH-approved organic-vapor/P100 combination suitable for the identified chemical.
An infrared scan shows a cool patch below a window, although the painted wall looks intact. The inspection record contains a thermal image, a photograph, and the room's relative humidity. Before describing the patch as currently wet, what additional evidence should the investigator obtain?
Correct answer: B - Material moisture readings at the patch and at unaffected areas of the same material.
Removing an authorized wall section exposes additional growth in the same assembly, beyond the agreed removal area but still inside containment. The supervisor is qualified to manage the additional work, and the original authorized work can continue safely. The owner gives verbal permission to expand removal, although the contract requires written approval of scope changes. How should the supervisor handle the discovery?
Correct answer: D - Document the discovery and obtain written approval before expanding the removal.
During prework checks, a manometer reads the contained room's pressure relative to the corridor. It shows -0.026 in. w.c. with the building HVAC off, +0.008 in. w.c. when the HVAC starts, and -0.026 in. w.c. when it stops. Containment doors remain closed, and measured HEPA-filtered exhaust airflow is unchanged. What best explains the repeated pressure reversal?
Correct answer: C - The building HVAC is overcoming the containment's negative-pressure balance.
An independent indoor environmental professional uses inspection and analytical findings to confirm abnormal settled fungal contamination on dry shelving. The contamination came from a mold-colonized wall in the adjoining room; no growth is found on the shelving itself. How should the shelving's environment be classified?
Correct answer: A - Condition 2: contamination dispersed from an identified area of actual mold growth.
A repaired supply-line leak has left paper-faced gypsum board soft, crumbling, and extensively colonized on its concealed face. The exposed wood studs have accessible surface growth but no rot, loss of section, or structural damage. Regulated-material hazards have been ruled out. Which salvage decision fits these findings?
Correct answer: D - Remove the damaged wallboard; clean and dry the sound framing.
An isolated HVAC system has mold growth penetrating wet fibrous duct liner. All duct housings are sound, and both lined and bare-metal sections are accessible. Unlined sections carry removable settled debris. The moisture source has been corrected. What should the HVAC remediation scope specify?
Correct answer: C - Remove and replace the contaminated liner; mechanically clean the sound metal surfaces.
Before closing a remediated wall cavity, a technician finds droplets on a chilled-water pipe where insulation is missing. A contact thermometer reads 50 degrees F at the pipe, while the cavity air has a dew point of 60 degrees F. Pressure testing finds no plumbing leak. Which correction addresses the source of this moisture?
Correct answer: B - Restore continuous pipe insulation with properly sealed vapor-resistant joints.
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