REHS Sample Exam Questions 1 with Complete Solutions

REHS Sample Exam Questions 1 with Complete Solutions What are the three things that provide protection against radiation? time, distance, sheilding What scale is used when measuring noise in a sheet metal shop? The A-weighted scale is most commonly used. It considers frequency, intensity , and impact level. how is ozone created? Photochemically. Naturally, as sunlight passes through oxygen molecules, and by high voltage electricity (lightening). O + UV light What does sodium thiosulfate do to chlorine? It neutralizes it. It destroys the free available chlorine present without effecting pH how long does it take class A radioactive waste to degrade to a safe level? 100 years. Where do you sample for radon in schools? In stairwells with poor ventilation What are the characeristsics of alpha particles? They are easily absorbed and have low penetrating ability. What are the criteria air pollutants? Sulfer dioxide, nitrogen oxide, carbon monoxide, lead, particulate matter How is dust from a cement kiln cleaned? Electrostatic precipitater. Particles pass through an electrical field, are charged, then are attracted to a plate. the particles then fall into a hopper. how far can a fly penetrate the soil? Compacted, six inches. Uncompacted, five feet. 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. What are the critical control points in receiving and preparing chicken? Temperatures associated with shipping, receiving, storage, preparation, cooking, cooling, holding (hot and cold) and reheating. What does it mean when milk tests negative for phosphates? It has been properly pasteurized. Why has there been a reduction in blood lead levels? Removal of lead from gasoline How often does the CDC recommend testing blood lead levels in children who live in high risk areas? Every three to six months. What type of filtration system should be implemented in a small community? A slow sand filtration system. What type of filtration system should be implemented in a new town with a clear lake and a relatively clean stream? A rapid sand filtration system. What type of roach is most common in American cities? The German cockroach What do roaches carry in their gut? Salmonella What happens to food toxins when they are frozen. Nothing. Freezing has no effect on toxins. What is the purpose of blanching vegetables? It inactivates the enzymes. Blanching celery, reduces the bacteria count. What absorbs gases? Charcoal How does household waste related to RCRA? It is exempt. what are an O and CGI meter used for? To monitor oxygen and combustible gases in confined spaces. What causes dengue fever? Mosquitoes Which pets can spread psittacosis? Parrots Why are personal monitors better than area monitors? 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. 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. 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, humidifiers and air conditioners. Lung disease characerized by non-malignant scarring. It is caused by silica dust, which is found in asbestos. Silicosis What type of enforcement can be used for a trailer park that has sewage on the surface area? Revoke their business license. In an emergency shelter, how much sleeping space is required per person? Thirty square feet. What gaurantees a person their rights? The Bill of Rights, which are the first 10 amendments to the constitution What should a homeowner do to get rid of rats? clean up the area, cover entrance holes, and bat with red squill. What is the purpose of sanitizer? To reduce the number of microorganisms. how do you compute prevalence rate? [(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 What is it called when an employer is liable for the employees actions within the scope of employment? 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.) how far apart should water and sewer lines be installed? ten feet What are Ringelmann charts? Ringelmann smoke charts are used to determine particulate emission density. They are being replaced with a measure of percent opacity. What disease can be contracted from swimming in a pond adjacent to a stock yard? Primarily leptosporosis. Also, a primary amoebic meningoencephalitis, schistomiisis, salmonella, legionella and pseudomonas. (not giardia) What does a sling psycrometer measure? Relative humidity Four characteristics used to classify hazardous materials? toxicity, corrosivity, ignitability, reactivity Is asbestosis malignant or nonmalignant? Nonmalignant How soon after preparation should a ready-to-eat potentially hazardous food be consumed? Two to four hours after preparation What is it called if apples test higher for pesticides than the regulated tolerance level? Adulterated Which institutions are most susceptible to nosicomial infections? Hospitals. What are the requirements for the temporary storage of hazardous waste? A basin with two layers of liners, intermediate collection system, and groundwater monitoring. How often should underground storage tanks be replaced? Every twenty years How long do you have to keep shellfish tags? Nintey days. How long should public swimming pools run their recirculation and disinfection equipment? Twenty four hours per day. (it should totally replace the water in 6-8 hours) What is the turnover rate for hot tubs? Public hot tubs, 30 mins or less. Residential, one hours or less. Which tick causes Rocky Mountain spotted fever? In the west, the wood tick and rabbit tick. in the east, dog tick. Bacillus cereus can form what as part of its reproductive cycle? Spores is Clostridium botulism an aerobe or anaerobe? Anaerobe Which swimming pool filters function the slowest? Diatomaceous earth filters What do you use to measure pH? Phenol red 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. What is oxidation in swimming pools? What causes hemolytic uremic syndrome? E.coli 0157:H7 What is the most important rule of food storage? First in first out. What is a sign of a fresh fish? Red gills. Spoiled fish will have sunken eyes, elastic flesh and be gray in color. When should alternative small wastewater systems be considered? 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.) What is the min water temp for a hospital laundry facility? Between 160 F and 170F Which biosafety containment level is suitable for work with agents of moderate potential hazard? Biosafety level two. What chemical is used to raise the pH in a swimming pool? Sodium carbonate, which is soda ash. Sodium bicarbonate will also raise the pH, but it raises the total alkalinity. What is a valuable tool in timely emergency response? Prior planning What can be used to disinfect water that is not chemically polluted or extremely polluted? Chlorine what does "in rem" mean? 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 is trichloroethylene used for? Dry cleaning What is not an allowable sludge disposal method? Dumping in the ocean. What is not an allowable sludge disposal method? Dumping in the ocean Why are methane and carbon monoxide monitored in landfills? They are explosive and a health hazard. Methane is explosive at 5 to 15 percent. What is the major constituent of land fills? Paper products Why is biodegradable plastic good for landfills? It contains a starch additive that provides food for microorganisms. What is the final cover depth of soil over a sanitary landfill? Two feet. What is aggressive water? 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. 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 What are the optimal conditions for composting? What is generated from combustion of waste in energy plants? Electricity and steam what is the major constituent of wastewater? Water What does latent phase mean in the context of disease development? It is the time from exposure to the time of illness What is the most important element in preventing food borne illness? Training employes about personal hygiene how often should a wading pool at a daycare be checked and what should be the result? 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 far apart do beds have to be placed in daycares? If toe to head, three feet. what causes listerioisis? Listeria bacterium