HOSMERIT
RADON EXAM ACTUAL QUESTIONS AND
ANSWERS 2024-2025 WITH COMPLETE
SOLUTION
According to the US EPA Citizens Guide to Radon, radon levels in most homes, can be
reduced to: Ans✔✔- 2 pCi/L or less
Homeowners should be advised to have their mitigation contractors stipulate that they will
follow: Ans✔✔- Radon Mitigation Standards such as the US EPA, AARST, ASTM, or as
recognized by their state radon office
Prolonged exposure to radon is considered dangerous because radon can cause: Ans✔✔-
lung cancer
The most common radon mitigation technique at this time is: Ans✔✔- Active soil
depressurization
The Radon Action Level in the United States is: Ans ✔✔- 4.0 pico Curies per liter of air
The submembrane mitigation strategy is applicable to which of the following foundation
types? Ans✔✔- Crawl space houses
What is radon? Ans✔✔- An invisible, odorless, tasteless, naturally occurring, radioactive
gas.
What is the minimum deployment/sampling period for a short-term test? Ans✔✔- Two
days
,What is the purpose of the US EPA Map of Radon Zones? Ans✔✔- To suggest where
radon resistant new construction techniques would be the most cost-effectively employed.
Which of the following best represents the recommendation of the U.S. EPA for citizen
exposure to radon? Ans✔✔- Long-term exposure to elevated radon can increase the
potential for lung cancer
Which of the following is an acceptable location for the discharge of an active soil
depressurization system? Ans✔✔- Above the eave of the roof.
Which of the following locations is appropriate for the fan of an active soil depressurization
system? Ans✔✔- Attic
Which of the following Radon measurement approaches best estimates occupant
exposure? Ans✔✔- A yearlong test with an alpha track detector in the lowest occupied
level of the home with no special precautions for closed building conditions.
A correct statement regarding radon testing in Zone 3 areas of the EPA Radon Potential
Map is that such testing: Ans✔✔- is recommended.
A significant difference between one room and the next in a building with a large central air
handling system is often caused by: Ans✔✔- An unbalanced air distribution system
After 25 years of updates by testers and state agencies, the US EPA Map of Radon Zones
is a good predictor of where indoor radon levels will not be elevated. Ans ✔✔- False
How can you tell if a house contains elevated levels of radon? Ans✔✔- Test for radon.
If a short-term, closed building radon test is conducted in the basement of a home with a
result of 10 pCi/L, what can be said about the radon levels on the first floor above the
basement? Ans✔✔- The first floor radon level is likely to be equal to or less than the
basement measurement of 10
, If the water for a home comes from an underground well that has 60,000 pCi/L in the water,
how much radon will be added to the air of the home due to normal usage of water?
Ans✔✔- 6 to 10 pCi/L
In a cold climate, stack effect is typically higher during the: Ans✔✔- Winter
In a house with a forced air heating and cooling system, which of the following conditions
would most likely increase short-term indoor radon concentrations the most? Ans ✔✔-
Return ducts under the slab with the air blower on.
In most homes the main source of elevated radon levels is: Ans ✔✔- the soil.
Indoor Radon levels are always higher during the winter months (November through March)
than any other time of year. Ans✔✔- False
On a nationwide basis, which of the following radon entry mechanisms account for the
greatest amount of radon entry? Ans✔✔- Convective movement of soil gas into the
building.
On an overall basis for similarly constructed homes in the same climatic area, under which
of the following conditions might one expect the highest radon entry into a home? Ans ✔✔-
Highly permeable soil with high radium content beneath the house which is entirely built
over a crawl space.
Pipe chases up through interiors of apartment buildings can provide radon pathways to
upper level units. Ans✔✔- True
Temperature induced stack effect is greatest when: Ans ✔✔- The outdoor temperatures
are very low relative to interior temperatures
The primary reason indoor radon levels are generally higher in basements is the fact that:
Ans✔✔- the basement is closest to the radon source.
RADON EXAM ACTUAL QUESTIONS AND
ANSWERS 2024-2025 WITH COMPLETE
SOLUTION
According to the US EPA Citizens Guide to Radon, radon levels in most homes, can be
reduced to: Ans✔✔- 2 pCi/L or less
Homeowners should be advised to have their mitigation contractors stipulate that they will
follow: Ans✔✔- Radon Mitigation Standards such as the US EPA, AARST, ASTM, or as
recognized by their state radon office
Prolonged exposure to radon is considered dangerous because radon can cause: Ans✔✔-
lung cancer
The most common radon mitigation technique at this time is: Ans✔✔- Active soil
depressurization
The Radon Action Level in the United States is: Ans ✔✔- 4.0 pico Curies per liter of air
The submembrane mitigation strategy is applicable to which of the following foundation
types? Ans✔✔- Crawl space houses
What is radon? Ans✔✔- An invisible, odorless, tasteless, naturally occurring, radioactive
gas.
What is the minimum deployment/sampling period for a short-term test? Ans✔✔- Two
days
,What is the purpose of the US EPA Map of Radon Zones? Ans✔✔- To suggest where
radon resistant new construction techniques would be the most cost-effectively employed.
Which of the following best represents the recommendation of the U.S. EPA for citizen
exposure to radon? Ans✔✔- Long-term exposure to elevated radon can increase the
potential for lung cancer
Which of the following is an acceptable location for the discharge of an active soil
depressurization system? Ans✔✔- Above the eave of the roof.
Which of the following locations is appropriate for the fan of an active soil depressurization
system? Ans✔✔- Attic
Which of the following Radon measurement approaches best estimates occupant
exposure? Ans✔✔- A yearlong test with an alpha track detector in the lowest occupied
level of the home with no special precautions for closed building conditions.
A correct statement regarding radon testing in Zone 3 areas of the EPA Radon Potential
Map is that such testing: Ans✔✔- is recommended.
A significant difference between one room and the next in a building with a large central air
handling system is often caused by: Ans✔✔- An unbalanced air distribution system
After 25 years of updates by testers and state agencies, the US EPA Map of Radon Zones
is a good predictor of where indoor radon levels will not be elevated. Ans ✔✔- False
How can you tell if a house contains elevated levels of radon? Ans✔✔- Test for radon.
If a short-term, closed building radon test is conducted in the basement of a home with a
result of 10 pCi/L, what can be said about the radon levels on the first floor above the
basement? Ans✔✔- The first floor radon level is likely to be equal to or less than the
basement measurement of 10
, If the water for a home comes from an underground well that has 60,000 pCi/L in the water,
how much radon will be added to the air of the home due to normal usage of water?
Ans✔✔- 6 to 10 pCi/L
In a cold climate, stack effect is typically higher during the: Ans✔✔- Winter
In a house with a forced air heating and cooling system, which of the following conditions
would most likely increase short-term indoor radon concentrations the most? Ans ✔✔-
Return ducts under the slab with the air blower on.
In most homes the main source of elevated radon levels is: Ans ✔✔- the soil.
Indoor Radon levels are always higher during the winter months (November through March)
than any other time of year. Ans✔✔- False
On a nationwide basis, which of the following radon entry mechanisms account for the
greatest amount of radon entry? Ans✔✔- Convective movement of soil gas into the
building.
On an overall basis for similarly constructed homes in the same climatic area, under which
of the following conditions might one expect the highest radon entry into a home? Ans ✔✔-
Highly permeable soil with high radium content beneath the house which is entirely built
over a crawl space.
Pipe chases up through interiors of apartment buildings can provide radon pathways to
upper level units. Ans✔✔- True
Temperature induced stack effect is greatest when: Ans ✔✔- The outdoor temperatures
are very low relative to interior temperatures
The primary reason indoor radon levels are generally higher in basements is the fact that:
Ans✔✔- the basement is closest to the radon source.
