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REHS Sample Exam 1 Questions (2023 – 2024)
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With all Possible Answers
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What are the three things that provide protection against radiation? - time, distance,
sheilding
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What scale is used when measuring noise in a sheet metal shop? - The A-weighted scale is
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most commonly used. It considers frequency, intensity , and impact level.
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how is ozone created? - Photochemically. Naturally, as sunlight passes through oxygen
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molecules, and by high voltage electricity (lightening). O + UV light
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What does sodium thiosulfate do to chlorine? - It neutralizes it. It destroys the free
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available chlorine present without effecting pH
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how long does it take class A radioactive waste to degrade to a safe level? - 100 years.
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Sp
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Where do you sample for radon in schools? - In stairwells with poor ventilation
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What are the characeristsics of alpha particles? - They are easily absorbed and have low
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penetrating ability.
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What are the criteria air pollutants? - Sulfer dioxide, nitrogen oxide, carbon monoxide, lead,
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particulate matter
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How is dust from a cement kiln cleaned? - Electrostatic precipitater. Particles pass through
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an electrical field, are charged, then are attracted to a plate. the particles then fall into a
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hopper.
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how far can a fly penetrate the soil? - Compacted, six inches. Uncompacted, five feet.
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How do you prevent Lyme disease? - Avoid ticks. Cover up and use repellant. Remove tick
carefully and seek medical attention. The cause is a spirochete Borrelia burgendorfi.
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What are the critical control points in receiving and preparing chicken? - Temperatures
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associated with shipping, receiving, storage, preparation, cooking, cooling, holding (hot and
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cold) and reheating.
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What does it mean when milk tests negative for phosphates? - It has been properly
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pasteurized.
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Why has there been a reduction in blood lead levels? - Removal of lead from gasoline
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Sp
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How often does the CDC recommend testing blood lead levels in children who live in high
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risk areas? - Every three to six months.
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What type of filtration system should be implemented in a small community? - A slow sand
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filtration system.
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What type of filtration system should be implemented in a new town with a clear lake and a
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relatively clean stream? - A rapid sand filtration system.
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What type of roach is most common in American cities? - The German cockroach
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What do roaches carry in their gut? - Salmonella
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What happens to food toxins when they are frozen. - Nothing. Freezing has no effect on
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toxins.
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What is the purpose of blanching vegetables? - It inactivates the enzymes. Blanching celery,
reduces the bacteria count.
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Sp
What absorbs gases? - Charcoal
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How does household waste related to RCRA? - It is exempt.
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Sp
what are an O and CGI meter used for? - To monitor oxygen and combustible gases in
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confined spaces.
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What causes dengue fever? - Mosquitoes
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Which pets can spread psittacosis? - Parrots
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Why are personal monitors better than area monitors? - Personal air sampling evaluates
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the actual worker exposure to airborne chemicals. Area samples are used to evaluate
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background concentrations, locate sources of exposure, or evaluate the effectiveness of
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control measures.
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What is the pfm exposure limit for Radon? - The EPA guideline for homes is 4 pci
(picocuries) per liter of air for a 24 hour period.
sh
Sp
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What is Legionaire's disease? - A respiratory infection caused by the Legionella bacteria.
The bacteria is found in water sources such as ventilation systems, hot water heaters,
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humidifiers and air conditioners.
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Sp
Lung disease characerized by non-malignant scarring. It is caused by silica dust, which is
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found in asbestos. - Silicosis
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Sp
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REHS Sample Exam 1 Questions (2023 – 2024)
ne
With all Possible Answers
la
tz
sh
Sp
ne
What are the three things that provide protection against radiation? - time, distance,
sheilding
la
sh
What scale is used when measuring noise in a sheet metal shop? - The A-weighted scale is
Sp
most commonly used. It considers frequency, intensity , and impact level.
ne
la
how is ozone created? - Photochemically. Naturally, as sunlight passes through oxygen
tz
molecules, and by high voltage electricity (lightening). O + UV light
sh
Sp
What does sodium thiosulfate do to chlorine? - It neutralizes it. It destroys the free
ne
available chlorine present without effecting pH
la
how long does it take class A radioactive waste to degrade to a safe level? - 100 years.
sh
Sp
ne
Where do you sample for radon in schools? - In stairwells with poor ventilation
la
What are the characeristsics of alpha particles? - They are easily absorbed and have low
tz
sh
penetrating ability.
Sp
ne
What are the criteria air pollutants? - Sulfer dioxide, nitrogen oxide, carbon monoxide, lead,
la
particulate matter
sh
How is dust from a cement kiln cleaned? - Electrostatic precipitater. Particles pass through
Sp
an electrical field, are charged, then are attracted to a plate. the particles then fall into a
ne
hopper.
la
tz
how far can a fly penetrate the soil? - Compacted, six inches. Uncompacted, five feet.
sh
Sp
ne
How do you prevent Lyme disease? - Avoid ticks. Cover up and use repellant. Remove tick
carefully and seek medical attention. The cause is a spirochete Borrelia burgendorfi.
la
What are the critical control points in receiving and preparing chicken? - Temperatures
sh
Sp
associated with shipping, receiving, storage, preparation, cooking, cooling, holding (hot and
ne
cold) and reheating.
a
tz
What does it mean when milk tests negative for phosphates? - It has been properly
l
sh
pasteurized.
Sp
ne
Why has there been a reduction in blood lead levels? - Removal of lead from gasoline
la
sh
Sp
la
Sp
, ne
sh
How often does the CDC recommend testing blood lead levels in children who live in high
ne
risk areas? - Every three to six months.
la
tz
What type of filtration system should be implemented in a small community? - A slow sand
sh
filtration system.
Sp
ne
What type of filtration system should be implemented in a new town with a clear lake and a
la
relatively clean stream? - A rapid sand filtration system.
sh
Sp
What type of roach is most common in American cities? - The German cockroach
ne
What do roaches carry in their gut? - Salmonella
la
tz
sh
What happens to food toxins when they are frozen. - Nothing. Freezing has no effect on
Sp
toxins.
ne
la
What is the purpose of blanching vegetables? - It inactivates the enzymes. Blanching celery,
reduces the bacteria count.
sh
Sp
What absorbs gases? - Charcoal
ne
la
How does household waste related to RCRA? - It is exempt.
tz
sh
Sp
what are an O and CGI meter used for? - To monitor oxygen and combustible gases in
ne
confined spaces.
la
What causes dengue fever? - Mosquitoes
sh
Sp
Which pets can spread psittacosis? - Parrots
ne
Why are personal monitors better than area monitors? - Personal air sampling evaluates
la
tz
the actual worker exposure to airborne chemicals. Area samples are used to evaluate
sh
background concentrations, locate sources of exposure, or evaluate the effectiveness of
Sp
control measures.
ne
la
What is the pfm exposure limit for Radon? - The EPA guideline for homes is 4 pci
(picocuries) per liter of air for a 24 hour period.
sh
Sp
ne
What is Legionaire's disease? - A respiratory infection caused by the Legionella bacteria.
The bacteria is found in water sources such as ventilation systems, hot water heaters,
a
humidifiers and air conditioners.
tz
l
sh
Sp
Lung disease characerized by non-malignant scarring. It is caused by silica dust, which is
ne
found in asbestos. - Silicosis
la
sh
Sp
la
Sp
