IICRC WRT EXAM QUESTIONS AND
VERIFIED ANSWERS
1. When water contains significant contamination and has the potential to cause discomfort
or sickness if consumed or touched by humans, it is classified as:
A. Category 2
B. Category 1
C. Category 3
D. Special Category
Answer: A
Conceptual Explanation: Category 2 water contains significant contamination and has the
potential to cause discomfort or sickness if contacted or consumed by humans. Category 3
is grossly contaminated.
2. Which term describes the temperature at which air becomes saturated and water vapor
begins to condense into liquid water?
A. Relative Humidity
B. Vapor Pressure
,C. Dew Point
D. Grains Per Pound
Answer: C
Conceptual Explanation: Dew point is the temperature at which air is 100% saturated.
Any further cooling results in condensation.
3. According to the IICRC S500, how many air movers should be installed for the first 50-70
square feet of affected wet floor in each room?
A. Two
B. One
C. Three
D. Four
Answer: B
Conceptual Explanation: The S500 standard suggests one air mover for every 50-70 sq. ft.
of affected floor space (depending on the specific version and application context).
4. What is the weight of water vapor in the air, measured in grains per pound (GPP) of dry
air?
A. Relative Humidity
B. Vapor Pressure
C. Humidity Ratio
, D. Dew Point
Answer: C
Conceptual Explanation: Humidity ratio is the weight of water vapor in the air, typically
expressed in Grains Per Pound (GPP).
5. A water intrusion that involves a large amount of water absorbed by low-evaporation
materials (such as plaster, wood, or concrete) is a:
A. Class 1
B. Class 2
C. Class 3
D. Class 4
Answer: D
Conceptual Explanation: Class 4 water intrusions involve ‘deeply held’ or ‘bound’ water in
low-porosity materials, requiring specialized drying methods.
6. The process of water moving through a material by molecular action is known as:
A. Evaporation
B. Condensation
C. Sublimation
D. Permeation
VERIFIED ANSWERS
1. When water contains significant contamination and has the potential to cause discomfort
or sickness if consumed or touched by humans, it is classified as:
A. Category 2
B. Category 1
C. Category 3
D. Special Category
Answer: A
Conceptual Explanation: Category 2 water contains significant contamination and has the
potential to cause discomfort or sickness if contacted or consumed by humans. Category 3
is grossly contaminated.
2. Which term describes the temperature at which air becomes saturated and water vapor
begins to condense into liquid water?
A. Relative Humidity
B. Vapor Pressure
,C. Dew Point
D. Grains Per Pound
Answer: C
Conceptual Explanation: Dew point is the temperature at which air is 100% saturated.
Any further cooling results in condensation.
3. According to the IICRC S500, how many air movers should be installed for the first 50-70
square feet of affected wet floor in each room?
A. Two
B. One
C. Three
D. Four
Answer: B
Conceptual Explanation: The S500 standard suggests one air mover for every 50-70 sq. ft.
of affected floor space (depending on the specific version and application context).
4. What is the weight of water vapor in the air, measured in grains per pound (GPP) of dry
air?
A. Relative Humidity
B. Vapor Pressure
C. Humidity Ratio
, D. Dew Point
Answer: C
Conceptual Explanation: Humidity ratio is the weight of water vapor in the air, typically
expressed in Grains Per Pound (GPP).
5. A water intrusion that involves a large amount of water absorbed by low-evaporation
materials (such as plaster, wood, or concrete) is a:
A. Class 1
B. Class 2
C. Class 3
D. Class 4
Answer: D
Conceptual Explanation: Class 4 water intrusions involve ‘deeply held’ or ‘bound’ water in
low-porosity materials, requiring specialized drying methods.
6. The process of water moving through a material by molecular action is known as:
A. Evaporation
B. Condensation
C. Sublimation
D. Permeation
