REHS Practice Questions - G

What is the term for a statistical estimate of an oral dose of a chemical that produces a lethal effect on half of animal population?

LD50

The dose-response relationship of a toxic substance depends on …?

• amount and concentration of the substance

• Duration of exposure to the substances

• Toxicity of the substance

Which respiratory device provides the best protection?

Positive pressure respirator, with full face piece

The emergency planning and community right-to-know act (SARA Title 3) requires the disclosure of all of the following except type and quantities of…?

• Chemicals produced on site

• Chemicals accidentally discharged into the atmosphere

• Chemicals routinely discharged into the atmosphere

• All chemicals routinely discharged into the atmosphere

All chemicals routinely discharged into the atmosphere

For first responder at an incident, which one of the following is listed correctly according to the order of importance?

1. Responder safety

2. Public safety

3. Environmental safety

4. Property protection

What is the danger and/or hazard posed by an ’Etiological Agent’ ?

Human Disease

‘Etiological Agents’ are materials known to…?

Contain pathogens, leading to human disease.

No person should be permitted to work in a trench or pit in sandy clay soil that has unsupported sides of banks higher than…?

5 feet

An employer moves employees who have reached the upper permissible level of exposure to a hazardous environment, to prevent further exposure. What type of hazard control is this?

Administrative Control

Quantitive risk assessments usually measure human exposure through all of the following EXCEPT…?

• Computer Models

• Blood or Urine analyses

• Personal Surveys

• Toxicological Analyses

Computer Models

What is an ‘endemic’ ?

Constant presence of an illness

What is the most common cause of bacterial meningitis in children under 5 years of age?

Haemophilus Influenzae Type B

What is ‘Haemophilus Influenzae Type B’ ?

Bacterial Infection

What are the symptoms of ‘Haemophilus Influenzae Type B‘ ?

• fever

• Vomiting

• Stiff neck

• Headache

• Spread through mucus or droplets from mouth and nose

How is ‘Giardiasis’ usually transmitted to others?

(also known as beaver fever)

Person to person transfer of cysts from feces of infected individual.

What are the symptoms ‘Giardiasis’ ?

• diarrhea

• Abdominal pain

• Bloating

• Nausea

• Vomiting

What is the risk group of ‘Giardiasis’ ?

Sexually active homosexual men

Travelers to highly endemic areas

Malfeasance, meaning?

Intentional and illegal act that may cause harm.

Performance of an authorized act in an unauthorized manner is called?

Misfeasance

Nonfeasance, meaning?

Failure to perform an act that is required by law.

Which of the following duties of state and local health agencies is intended to ensure that the public’s health and welfare are protected?

Regulatory Responsibilities

Which of the following is a measure of the amount of light scattered by particles suspended in a water test sample?

Nephelometric Turbidity Units (NTU)

What is an ‘epidemic’ ?

The occurrence in a community or region of cases of an illness clearly in excess of expectancy.

What portal of entry should a field sanitation protect to avoid contracting Lyme Disease?

Skin

‘Swimmers Itch’ is a common name for which of the following diseases?

Schistosomiasis

What causes ‘Schistosomiasis’ ?

Parasitic disease, caused by flatworms.

People become infected after swimming in water contains the larval form of the ‘schistosome.’

What are the symptoms for Swimmers Itch/Schistosomiasis?

• Abdominal pain

• Bloody stool

• Itchy skin

Which of the following factors would least contribute to the emergence of a new infectious disease?

• human disease

• Heat disinfection

• Antibiotic use

• Disinfectant use

Heat disinfection

‘Listeriosis’ is commonly associated with…?

Contaminated Food

Hemolytic Uremic Syndrome (HUS) is caused by infection with?

Escherichia Coli 0157:H7 (E.coli)

The basic principles of disease control include all of the following except…?

• lag phase

• Control of disease source

• Mode of transmission

• Susceptibility

Lag Phase

What is the ‘Incubation Period’ ?

The interval between exposure to an infectious agent and the appearance of the first symptom.

An establishment known to have imminent health hazards and is not closed by the inspecting regulatory authority. This is an example of…?

Nonfeasance

Vehicle borne, vector borne, or airborne are all examples of…

Indirect Modes of Transmission

An employer is held liable for the torts of its employees committed within the scope of their employment. This is referred to as…?

Responder Superior

An action authorized by law to restrict or prevent the movement of goods for the protection of public health, safety, and welfare is called an order of…?

Embargo

What is the federal agency that regulates food additives?

Food and Drug administration

When legal action is being prepared, one of the first steps sanitation should take is…?

Keep accurate records

How is the term ‘contamination’ defined when used in connection with a communicable disease?

Presence of pathogenic agents on a surface, article, or substance

What is the most common contributing factor to food borne illness?

Improper holding temperatures

Why are some foods classified as time/temperature control for safety?

They support rapid growth of pathogenic microorganisms

Which food does not require refrigeration at 41F (5C) ?

UHT creamers

What is the best means of inhibiting the growth of microorganisms in fresh meat?

Adequate refrigeration and cleanliness

What is the maximum accumulated time that time/temperature control for safety food can safely be exposed to the temperature danger zone?

6 hours

If time only is used as a public health control, the maximum period for time recommended by the FDA for time/temperature control for safety food to be held is…?

6 hours if the warmest part of the food item does not exceed 70F

What is the minimum period of time that the FDA recommends employees wash their hands and arms up to the elbow?

20 seconds

Unpasteurized eggs not intended for immediate service should be cooked to…?

155F for 15 seconds

What is the usual mode of infection from Salmonella?

Ingestion of contaminated food

What is the source of ‘Scombroid Poisoning’ ?

Histamines in the muscle of fish

What is ‘Scombroid Poisoning’ and what are it’s symptoms…?

Food intoxication,

• Tingling and burning sensations

• Headache

• Heart palpitations

What are the signs of spoiled fish?

Strong odor, gray gills, and sunken eyes

What is not a sign of spoiled fish?

Elastic fish

Which shellfish is most likely to cause illness?

Oysters

The laboratory reports a positive coliform test that exceeds permissible limits on a bottle of pasteurized milk. What does this indicate?

Improper bactericidal treatment of equipment

What is the most effective practice for preventing ‘Trichinosis’ in people?

Be sure that fresh pork is cooked thoroughly cooked.

What is, ‘Trichinosis’ ?

Parasitic infection caused by eating raw or undercooked meat from animals.

An HACCP plan is not required when…?

Cooling and reheating TCS foods in bulk

What should be done with food samples collected during a food borne illness investigation?

Freeze

What is the primary requirement in designing a food service facility?

Cleanability

What is the most important rule of food storage ?

Follow the ‘first in, first out’ rule.

What type of well is considered LEAST likely to become contaminated?

Drilled

Diatomaceous Earth Filters…?

Should be supplemented by a chlorination system

Microbial pollution travels only a short distance through…?

Smooth Clay

What type of filter is recommended for use in small communities and rural places?

Slow Sand

All of the following are used to disinfect water, except…?

• chlorine

• Bromine

• Iodine

• Fluorine

Fluorine

Backsiphonage may be prevented by all of the following methods except…?

• hydrostatic loops

• Vacuum breakers

• Air gap separation

• Back pressure units

Hydrostatic Loops

What is the least effective method for calcium removal from drinking water?

Activated carbon

Before a drinking water sample is taken, the sampling tap should be clean, free of leaks, and flushed for how long?

2 to 3 minutes

The wastewater from the flushing of a water closet, latrine, or privy is referred to as…

Black Water

What are the nutrients associated with eutrophication?

• organic carbon

• Nitrogen

• Phosphates

What is not true about ‘Ozone’ ?

Long Lasting Residual

What does a mottled brown and red soil indicate?

Inadequate aeration methods

Lime coagulation, mixed media filtration, and activated carbon filtration will greatly reduce…?

EPA Primary Pollutants

It is known that some pathogenic organisms found in wastewater will survive more than _____ of harsh temperature extremes…?

2 years

Stream pollution is sometimes apparent by….?

Zone of Degradation

Sludge accumulation in a tank serving a normal home has been estimated at…?

18-21 gallons per person per year

How often should a septic tank for a private home be serviced?

Every 3-5 years

Human disease from aerosols of wastewater…

Are related primarily to wastewater treatment by the activated sludge, trickling filter, and spray irrigation processes.

After servicing (pumping) of a septic tank, it is essential that the tank and lid be…?

Replaced and secured for safety purposes.

According to the Resource Conservation and Recovery Act (RCRA) how must hazardous household waste be disposed of?

Hazardous household waste is exempt from RCRA requirements

The grinding of garbage is an acceptable method of…?

Garbage Disposal

What is not considered an advantage of using the ‘shredding of solid waste’ landfill method except…?

It will readily absorb participation

The best sanitary landfill method for a location with rolling terrain is the…?

Area or ramp method

Which of the following is not a type of hazardous waste incinerator?

Pressurized

Which federal law regulates underground storage tanks for hazardous waste?

Resource conservation and recovery act

What is the best device for collecting undisturbed soil?

Split spoon

Rocky Mountain Spotted Fever is transmitted by…?

Dog Ticks

What are the peak season for rats to breed in temperature zones?

Spring and Fall

Which of the following pesticides can be legally used in the United States by the public?

Diazation

Poison ivy, poison oak, poison sumac, contain oleoresin that is found in all parts of the plant, except?

Wood

Psittacosis is most commonly spread by…?

Pigeons

Hay fever is correctly referred to as…?

Polenosis

Which is the most effective for controlling ragweed?

2,4, -D

An infected organism that does not exhibit symptoms during the spread of an illness is called an…?

Carrier

The killing of an infectious agent outside the body by chemical or physical means is termed…?

Disinfection

The term ‘RAD’ means…?

Radiation Absorbed Dose

Which of the following have little penetrating power and are normally a hazard to health only in the form of internal radiation and received through ingestion, inhalation, or open wounds…?

Alpha Rays

Beta Radiation is most commonly blocked by which of the following materials?

Glass or Plastic

Microwaves are reflected by…?

Metals

The energy of ionizing radiation is measured in…?

Electron Volts (eV)