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Free WRT Practice Questions

10 free, exam-style IICRC Water Damage Restoration Technician (WRT) practice questions with answers and explanations. No signup required. Work through them below, then take the full free WRT practice test to study every exam domain.

Question 1

A toilet bowl overflows onto the bathroom floor. The water contains urine but no feces. At the moment of inspection, how should this water be categorized?

  1. Category 1, since it came from a sanitary supply
  2. Category 2, reflecting significant but not gross contamination
  3. Category 3, because any water that overflows from a toilet is automatically considered grossly contaminated sewage
  4. The category cannot be determined until the volume is measured
Show answer & explanation

Correct answer: B - Category 2, reflecting significant but not gross contamination

Question 2

A water loss has saturated solid hardwood flooring and plaster walls. Drying these low-permeance materials will require specialty methods, a large vapor-pressure differential, and an extended drying time. This loss is BEST described as:

  1. Class 1
  2. Class 2
  3. Class 3
  4. Class 4
Show answer & explanation

Correct answer: D - Class 4

Question 3

Air in a structure is heated, but no moisture is added to or removed from it. What happens to the relative humidity of that air?

  1. It decreases, because warmer air is capable of holding more moisture
  2. It increases, because heat drives moisture out of wet materials into the air
  3. It stays the same, because no moisture was actually added or removed
  4. It rises only once the air temperature reaches the dew point
Show answer & explanation

Correct answer: A - It decreases, because warmer air is capable of holding more moisture

Question 4

When beginning the physical drying of a structure with standing water, which action removes the GREATEST amount of water in the least time and should therefore be performed first?

  1. Running dehumidifiers, on the basis that removing water vapor from the air is the step that controls the entire drying process
  2. Raising the temperature to speed up surface evaporation
  3. Extracting the standing water
  4. Positioning air movers to evaporate moisture from surfaces
Show answer & explanation

Correct answer: C - Extracting the standing water

Question 5

A structure is being dried in cold conditions, and the technician finds that the refrigerant dehumidifier's coils keep frosting over, sharply reducing its output. Which type of dehumidification is BEST suited to these conditions?

  1. A conventional refrigerant dehumidifier running at a higher fan speed
  2. A low-grain refrigerant (LGR) dehumidifier, which uses a pre-cooling module to pull moisture down to very low grain levels
  3. Additional air movers to make up for the lost capacity
  4. A desiccant dehumidifier, which adsorbs water vapor instead of condensing it
Show answer & explanation

Correct answer: D - A desiccant dehumidifier, which adsorbs water vapor instead of condensing it

Question 6

A room measures 20 ft × 15 ft × 8 ft and has sustained a Class 2 loss. Using an LGR factor of 50 and dehumidifiers rated at 16 pints per day (AHAM), how many dehumidifiers are required? (Cubic Footage ÷ Factor = total PPD needed; total PPD ÷ AHAM rating = number of units.)

  1. 2 dehumidifiers
  2. 3 dehumidifiers
  3. 4 dehumidifiers
  4. 48 dehumidifiers
Show answer & explanation

Correct answer: B - 3 dehumidifiers

Question 7

Per EPA antimicrobial classifications, which type of product is required to destroy ALL microorganisms, including bacterial and fungal spores?

  1. A sanitizer, which reduces microorganisms on a surface to a safe level
  2. A disinfectant, which destroys or inactivates microorganisms but not necessarily spores
  3. A sterilizer, which destroys all microorganisms, including their spores
  4. An antiseptic, which is applied to living skin to inhibit microorganisms
Show answer & explanation

Correct answer: C - A sterilizer, which destroys all microorganisms, including their spores

Question 8

Above approximately what moisture content can wood-DESTROYING (wood-rotting) fungi begin to grow in structural lumber?

  1. 20%
  2. 16%
  3. 28-30%
  4. 11%
Show answer & explanation

Correct answer: A - 20%

Question 9

Mold growth requires a food source, a suitable temperature, time, and moisture. In a typical water-damage restoration project, which of these is the factor the restorer can MOST practically control to prevent microbial amplification?

  1. Moisture
  2. The organic food source contained within the building materials
  3. The ambient temperature throughout the affected structure
  4. The amount of time that has elapsed since the water intrusion
Show answer & explanation

Correct answer: A - Moisture

Question 10

Within the ANSI/IICRC S500 standard, which term identifies a practice that is considered MANDATORY - representing both the standard of care and a regulatory requirement?

  1. Recommend
  2. Should
  3. Shall
  4. May
Show answer & explanation

Correct answer: C - Shall

What's on the WRT exam

The IICRC Water Damage Restoration Technician (WRT) exam is organized into 1 knowledge domains. These free practice questions are drawn from across them so you can see where you're strong and where to study:

  1. Water Damage Restoration Technician body of knowledge

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