IICRC WRT FINAL EXAM
CERTIFICATION PRACTICE
QUESTIONS AND ANSWERS
1. According to the IICRC S500, which category of water originates from a source that does
not pose substantial risk from dermal, ingestion, or inhalation exposure?
A. Category 1
B. Category 2
C. Category 3
D. Special Category
Answer: A
Conceptual Explanation: Category 1 water originates from a sanitary water source and
does not pose substantial risk from exposure.
2. Which class of water intrusion involves the largest amount of water absorption into the
environment, where the water is significantly absorbed by low-evaporation materials?
A. Class 1
B. Class 2
,C. Class 3
D. Class 4
Answer: D
Conceptual Explanation: Class 4 water intrusions involve significant water absorption
into low-evaporation materials like concrete, hardwood, or brick.
3. Psychrometrics is defined as the study of the physical properties of:
A. Fluid dynamics in pipes
B. Moist air and its effects on materials
C. Microbial growth rates
D. Electrical conductivity in water
Answer: B
Conceptual Explanation: Psychrometrics is the study of the thermodynamic properties of
moist air.
4. What is the standard measurement used to express the weight of water vapor in air?
A. Relative Humidity (RH)
B. Grains per pound (GPP)
C. Dew Point
D. Pounds per square inch (PSI)
, Answer: B
Conceptual Explanation: Grains per pound (GPP) is the unit used to measure specific
humidity or the weight of water vapor in a pound of dry air.
5. At what point does condensation begin to occur on a surface?
A. When the surface temperature is above the dew point
B. When the surface temperature is at or below the dew point
C. When relative humidity reaches 50%
D. When specific humidity reaches 100 GPP
Answer: B
Conceptual Explanation: Condensation occurs when the temperature of a surface falls
below the dew point of the surrounding air.
6. Which type of dehumidifier is most effective in environments with temperatures below 60
degrees Fahrenheit?
A. Conventional Refrigerant
B. Low Grain Refrigerant (LGR)
C. High Capacity Air Mover
D. Desiccant
Answer: D
CERTIFICATION PRACTICE
QUESTIONS AND ANSWERS
1. According to the IICRC S500, which category of water originates from a source that does
not pose substantial risk from dermal, ingestion, or inhalation exposure?
A. Category 1
B. Category 2
C. Category 3
D. Special Category
Answer: A
Conceptual Explanation: Category 1 water originates from a sanitary water source and
does not pose substantial risk from exposure.
2. Which class of water intrusion involves the largest amount of water absorption into the
environment, where the water is significantly absorbed by low-evaporation materials?
A. Class 1
B. Class 2
,C. Class 3
D. Class 4
Answer: D
Conceptual Explanation: Class 4 water intrusions involve significant water absorption
into low-evaporation materials like concrete, hardwood, or brick.
3. Psychrometrics is defined as the study of the physical properties of:
A. Fluid dynamics in pipes
B. Moist air and its effects on materials
C. Microbial growth rates
D. Electrical conductivity in water
Answer: B
Conceptual Explanation: Psychrometrics is the study of the thermodynamic properties of
moist air.
4. What is the standard measurement used to express the weight of water vapor in air?
A. Relative Humidity (RH)
B. Grains per pound (GPP)
C. Dew Point
D. Pounds per square inch (PSI)
, Answer: B
Conceptual Explanation: Grains per pound (GPP) is the unit used to measure specific
humidity or the weight of water vapor in a pound of dry air.
5. At what point does condensation begin to occur on a surface?
A. When the surface temperature is above the dew point
B. When the surface temperature is at or below the dew point
C. When relative humidity reaches 50%
D. When specific humidity reaches 100 GPP
Answer: B
Conceptual Explanation: Condensation occurs when the temperature of a surface falls
below the dew point of the surrounding air.
6. Which type of dehumidifier is most effective in environments with temperatures below 60
degrees Fahrenheit?
A. Conventional Refrigerant
B. Low Grain Refrigerant (LGR)
C. High Capacity Air Mover
D. Desiccant
Answer: D
