REHS Sample Exam Questions 1

time, distance, sheilding

What are the three things that provide protection against radiation?

The A-weighted scale is most commonly used. It considers frequency, intensity , and impact level.

What scale is used when measuring noise in a sheet metal shop?

Photochemically. Naturally, as sunlight passes through oxygen molecules, and by high voltage electricity (lightening). O + UV light

how is ozone created?

It neutralizes it. It destroys the free available chlorine present without effecting pH

What does sodium thiosulfate do to chlorine?

100 years.

how long does it take class A radioactive waste to degrade to a safe level?

In stairwells with poor ventilation

Where do you sample for radon in schools?

They are easily absorbed and have low penetrating ability.

What are the characeristsics of alpha particles?

Sulfer dioxide, nitrogen oxide, carbon monoxide, lead, particulate matter

What are the criteria air pollutants?

Electrostatic precipitater. Particles pass through an electrical field, are charged, then are attracted to a plate. the particles then fall into a hopper.

How is dust from a cement kiln cleaned?

Compacted, six inches. Uncompacted, five feet.

how far can a fly penetrate the soil?

Avoid ticks. Cover up and use repellant. Remove tick carefully and seek medical attention. The cause is a spirochete Borrelia burgendorfi.

How do you prevent Lyme disease?

Temperatures associated with shipping, receiving, storage, preparation, cooking, cooling, holding (hot and cold) and reheating.

What are the critical control points in receiving and preparing chicken?

It has been properly pasteurized.

What does it mean when milk tests negative for phosphates?

Removal of lead from gasoline

Why has there been a reduction in blood lead levels?

Every three to six months.

How often does the CDC recommend testing blood lead levels in children who live in high risk areas?

A slow sand filtration system.

What type of filtration system should be implemented in a small community?

A rapid sand filtration system.

What type of filtration system should be implemented in a new town with a clear lake and a relatively clean stream?

The German cockroach

What type of roach is most common in American cities?

Salmonella

What do roaches carry in their gut?

Nothing. Freezing has no effect on toxins.

What happens to food toxins when they are frozen.

It inactivates the enzymes. Blanching celery, reduces the bacteria count.

What is the purpose of blanching vegetables?

Charcoal

What absorbs gases?

It is exempt.

How does household waste related to RCRA?

To monitor oxygen and combustible gases in confined spaces.

what are an O and CGI meter used for?

Mosquitoes

What causes dengue fever?

Parrots

Which pets can spread psittacosis?

Personal air sampling evaluates the actual worker exposure to airborne chemicals. Area samples are used to evaluate background concentrations, locate sources of exposure, or evaluate the effectiveness of control measures.

Why are personal monitors better than area monitors?

The EPA guideline for homes is 4 pci (picocuries) per liter of air for a 24 hour period.

What is the pfm exposure limit for Radon?

A respiratory infection caused by the Legionella bacteria. The bacteria is found in water sources such as ventilation systems, hot water heaters, humidifiers and air conditioners.

What is Legionaire's disease?

Silicosis

Lung disease characerized by non-malignant scarring. It is caused by silica dust, which is found in asbestos.

Revoke their business license.

What type of enforcement can be used for a trailer park that has sewage on the surface area?

Thirty square feet.

In an emergency shelter, how much sleeping space is required per person?

The Bill of Rights, which are the first 10 amendments to the constitution

What gaurantees a person their rights?

clean up the area, cover entrance holes, and bat with red squill.

What should a homeowner do to get rid of rats?

To reduce the number of microorganisms.

What is the purpose of sanitizer?

[(The total number of cases of a disease existing in the population at a given time -

new and old cases)/(total number of persons in the population ] x 1,000 = prevalence rate

how do you compute prevalence rate?

Respondent superior. (Parens patriae is "parent of the country" or the power of the state to commit mentally ill people who are a danger to themselves or others.)

What is it called when an employer is liable for the employees actions within the scope of employment?

ten feet

how far apart should water and sewer lines be installed?

Ringelmann smoke charts are used to determine particulate emission density. They are being replaced with a measure of percent opacity.

What are Ringelmann charts?

Primarily leptosporosis. Also, a primary amoebic meningoencephalitis, schistomiisis, salmonella, legionella and pseudomonas. (not giardia)

What disease can be contracted from swimming in a pond adjacent to a stock yard?

Relative humidity

What does a sling psycrometer measure?

toxicity, corrosivity, ignitability, reactivity

Four characteristics used to classify hazardous materials?

Nonmalignant

Is asbestosis malignant or nonmalignant?

Two to four hours after preparation

How soon after preparation should a ready-to-eat potentially hazardous food be consumed?

Adulterated

What is it called if apples test higher for pesticides than the regulated tolerance level?

Hospitals.

Which institutions are most susceptible to nosicomial infections?

A basin with two layers of liners, intermediate collection system, and groundwater monitoring.

What are the requirements for the temporary storage of hazardous waste?

Every twenty years

How often should underground storage tanks be replaced?

Nintey days.

How long do you have to keep shellfish tags?

Twenty four hours per day. (it should totally replace the water in 6-8 hours)

How long should public swimming pools run their recirculation and disinfection equipment?

Public hot tubs, 30 mins or less. Residential, one hours or less.

What is the turnover rate for hot tubs?

In the west, the wood tick and rabbit tick. in the east, dog tick.

Which tick causes Rocky Mountain spotted fever?

Spores

Bacillus cereus can form what as part of its reproductive cycle?

Anaerobe

is Clostridium botulism an aerobe or anaerobe?

Diatomaceous earth filters

Which swimming pool filters function the slowest?

Phenol red

What do you use to measure pH?

What is oxidation in swimming pools?

The process of nitrogen based organics (snot, sweat, pee, feces, etc.) combining with the chlorine and then evaporating off. The large contaminants are filtered and everything else is oxidized.

E.coli 0157:H7

What causes hemolytic uremic syndrome?

First in first out.

What is the most important rule of food storage?

Red gills. Spoiled fish will have sunken eyes, elastic flesh and be gray in color.

What is a sign of a fresh fish?

When conventional systems won't work due to impervious soil layers. In Utah, four feet of suitable soil are required, and there needs to be 24" of separation to ground water. (This answer may be when the impervious layer is within 10 feet of the surface.)

When should alternative small wastewater systems be considered?

Between 160 F and 170F

What is the min water temp for a hospital laundry facility?

Biosafety level two.

Which biosafety containment level is suitable for work with agents of moderate potential hazard?

Sodium carbonate, which is soda ash. Sodium bicarbonate will also raise the pH, but it raises the total alkalinity.

What chemical is used to raise the pH in a swimming pool?

Prior planning

What is a valuable tool in timely emergency response?

Chlorine

What can be used to disinfect water that is not chemically polluted or extremely polluted?

A lawsuit against an item of property, not against a person (in personam). An action in rem is a proceeding that takes no notice of the owner of the property but determines rights in the property that are conclusive against all the world.

what does "in rem" mean?

Dry cleaning

What is trichloroethylene used for?

Dumping in the ocean.

What is not an allowable sludge disposal method?

Dumping in the ocean

What is not an allowable sludge disposal method?

They are explosive and a health hazard. Methane is explosive at 5 to 15 percent.

Why are methane and carbon monoxide monitored in landfills?

Paper products

What is the major constituent of land fills?

It contains a starch additive that provides food for microorganisms.

Why is biodegradable plastic good for landfills?

Two feet.

What is the final cover depth of soil over a sanitary landfill?

Water that is acidic, or has low pH. Water from deep wells tend to be more acidic, and in some city water supplies, a buffer is added to raise the pH. Acidic water causes more damage to the pipes.

What is aggressive water?

What are the optimal conditions for composting?

Oxygen

Moisure - 40% to 60%

Temp - at least 131 F for three days (WHO reccomends 140 F) for pathogen destructions

carbon/nitrogen levels 25 to 35

Electricity and steam

What is generated from combustion of waste in energy plants?

Water

what is the major constituent of wastewater?

It is the time from exposure to the time of illness

What does latent phase mean in the context of disease development?

Training employes about personal hygiene

What is the most important element in preventing food borne illness?

It should be checked every hour to two hours and the residual chlorine should be 1.5 to 3.0 ppm (fill and draw pools are prohibited)

how often should a wading pool at a daycare be checked and what should be the result?

If toe to head, three feet.

How far apart do beds have to be placed in daycares?

Listeria bacterium

what causes listerioisis?