Virginia Radon Mitigation Contractor
Exam Practice Questions And Correct
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Rationale 2026 Q&A| Instant Download
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1. In Virginia radon mitigation practice, which statement best describes
the primary purpose of an active soil depressurization (ASD) system
installed beneath a residential structure?
A. To increase indoor humidity and reduce static electricity
B. To draw radon-laden soil gas from beneath the building and safely exhaust
it above the roofline before it enters occupied spaces
C. To remove carbon monoxide generated by combustion appliances
D. To pressurize crawl spaces so groundwater infiltration is eliminated
,B. To draw radon-laden soil gas from beneath the building and safely
exhaust it above the roofline before it enters occupied spaces
Rationale: Active soil depressurization is the most widely used and
effective radon mitigation method because it creates a pressure field
beneath the structure that captures soil gases and exhausts them outdoors
before they can enter the living area.
2. Radon is classified as which of the following?
A. A manufactured industrial solvent commonly found in insulation
B. A naturally occurring radioactive gas produced from the decay of uranium
in soil and rock
C. A biological contaminant produced by mold growth
D. A combustible gas generated by household appliances
B. A naturally occurring radioactive gas produced from the decay of
uranium in soil and rock
Rationale: Radon originates from the natural radioactive decay of uranium
and related elements found in soil, rock, and groundwater. It can migrate
into buildings through foundation openings.
3. Which location should generally be tested first when determining the
highest potential radon exposure level in a residence?
A. The attic
B. The roof surface
,C. The lowest occupiable level of the structure
D. The highest bedroom only
C. The lowest occupiable level of the structure
Rationale: Radon typically enters from the soil beneath a building and
therefore concentrations are usually highest in the lowest occupied area,
making that location most appropriate for testing.
4. Under Virginia law, individuals conducting radon mitigation services
must generally possess which qualification?
A. Only a local business license
B. Certification or proficiency recognized by approved radon credentialing
organizations or other accepted measures
C. A plumbing journeyman license only
D. A real estate license
B. Certification or proficiency recognized by approved radon credentialing
organizations or other accepted measures
Rationale: Virginia requires radon professionals to be recognized through
accepted proficiency measures, including recognized national radon
credentialing organizations.
5. A mitigation fan installed in an ASD system is primarily intended to:
A. Heat the exhaust air before discharge
B. Create negative pressure beneath the foundation relative to indoor air
, pressure
C. Pressurize the living area
D. Filter radioactive particles from indoor air only
B. Create negative pressure beneath the foundation relative to indoor air
pressure
Rationale: The fan establishes suction beneath the slab or membrane,
reducing the likelihood that radon-bearing soil gas will enter the building.
6. Which foundation type commonly requires a membrane installation as
part of an effective radon mitigation system?
A. Suspended wood floor over a ventilated attic
B. Crawl space with exposed earth
C. Steel roof deck
D. Concrete parking structure roof
B. Crawl space with exposed earth
Rationale: Exposed soil in crawl spaces can be a significant radon entry
source, and durable membrane coverage is commonly used to facilitate
depressurization.
7. What is the principal reason that all major slab openings should be
sealed during mitigation?
A. To improve paint adhesion
B. To eliminate all airflow through the house
Exam Practice Questions And Correct
Answers (Verified Answers) Plus
Rationale 2026 Q&A| Instant Download
1. In Virginia radon mitigation practice, which statement best describes
the primary purpose of an active soil depressurization (ASD) system
installed beneath a residential structure?
A. To increase indoor humidity and reduce static electricity
B. To draw radon-laden soil gas from beneath the building and safely exhaust
it above the roofline before it enters occupied spaces
C. To remove carbon monoxide generated by combustion appliances
D. To pressurize crawl spaces so groundwater infiltration is eliminated
,B. To draw radon-laden soil gas from beneath the building and safely
exhaust it above the roofline before it enters occupied spaces
Rationale: Active soil depressurization is the most widely used and
effective radon mitigation method because it creates a pressure field
beneath the structure that captures soil gases and exhausts them outdoors
before they can enter the living area.
2. Radon is classified as which of the following?
A. A manufactured industrial solvent commonly found in insulation
B. A naturally occurring radioactive gas produced from the decay of uranium
in soil and rock
C. A biological contaminant produced by mold growth
D. A combustible gas generated by household appliances
B. A naturally occurring radioactive gas produced from the decay of
uranium in soil and rock
Rationale: Radon originates from the natural radioactive decay of uranium
and related elements found in soil, rock, and groundwater. It can migrate
into buildings through foundation openings.
3. Which location should generally be tested first when determining the
highest potential radon exposure level in a residence?
A. The attic
B. The roof surface
,C. The lowest occupiable level of the structure
D. The highest bedroom only
C. The lowest occupiable level of the structure
Rationale: Radon typically enters from the soil beneath a building and
therefore concentrations are usually highest in the lowest occupied area,
making that location most appropriate for testing.
4. Under Virginia law, individuals conducting radon mitigation services
must generally possess which qualification?
A. Only a local business license
B. Certification or proficiency recognized by approved radon credentialing
organizations or other accepted measures
C. A plumbing journeyman license only
D. A real estate license
B. Certification or proficiency recognized by approved radon credentialing
organizations or other accepted measures
Rationale: Virginia requires radon professionals to be recognized through
accepted proficiency measures, including recognized national radon
credentialing organizations.
5. A mitigation fan installed in an ASD system is primarily intended to:
A. Heat the exhaust air before discharge
B. Create negative pressure beneath the foundation relative to indoor air
, pressure
C. Pressurize the living area
D. Filter radioactive particles from indoor air only
B. Create negative pressure beneath the foundation relative to indoor air
pressure
Rationale: The fan establishes suction beneath the slab or membrane,
reducing the likelihood that radon-bearing soil gas will enter the building.
6. Which foundation type commonly requires a membrane installation as
part of an effective radon mitigation system?
A. Suspended wood floor over a ventilated attic
B. Crawl space with exposed earth
C. Steel roof deck
D. Concrete parking structure roof
B. Crawl space with exposed earth
Rationale: Exposed soil in crawl spaces can be a significant radon entry
source, and durable membrane coverage is commonly used to facilitate
depressurization.
7. What is the principal reason that all major slab openings should be
sealed during mitigation?
A. To improve paint adhesion
B. To eliminate all airflow through the house
