NEHA RS PRACTICE EXAM Questions
with 100% Correct Answers Latest
Update 2025 GRADED A+
Which of the following mosquito genuses is primarily the vector of malaria? - Correct
Answer-Anopheles
Although malaria is not a concern in the united states, the world health organization
(WHO) states that: - Correct Answer-Nearly 40% of the worlds population lives in
regions at risk for malaria
An estimated 500 million people per year become severely ill as a result of malaria
Most cases of malaria occur in some of the poorest countries
Sarcoptes scabiei, which is the vector causing scabies, is a: - Correct Answer-Mite
The etiologic agent causing lyme disease is: - Correct Answer-Borrella burgdorferi
Also known as woolsorters disease because of its association with sheep, this biological
agent has been targeted as a possible terrorist biological weapon: - Correct Answer-
Anthrax
The appropriate definition of environmental epidemiology is: - Correct Answer-The study
of factors influencing the distribution and determinants of disease
Health dept require that dogs or other animals that have bitten a human shall be
quarantined for: - Correct Answer-10 days
Dr John Snow, a London physician, is known as the father of field epidemiology due to
his investigation of the broad street well which uncovered the cause of an epidemic of: -
Correct Answer-Cholera
This microbiologist was first isolate the bacteria that caused the epidemic in London.
While studying similar outbreaks along the elbe river in Germany, he found that the city
of altona filtered their water before drinking and had a much lower morbidity rate than
other cities on the river. - Correct Answer-Robert Koch
As a result of the findings in altona, Germany and many similar efforts, water treatment
has eliminated many rampant diseases in developing areas of the world. Which of the
following is not a disease that water treatment has helped eliminate? - Correct Answer-
Hep A
,Evisceration and cold storage of chickens at 3 degrees Celsius (37.4 degrees
Fahrenheit) may cause an increase in numbers of these bacteria. - Correct Answer-
Aeromonas hydrophila
The constant presence of a disease or infectious agent within a given geographic area
defines: - Correct Answer-Endemic
Which of the following is an example of direct transmission of an infectious agent? -
Correct Answer-Droplets transmitted by coughing on a person
An observational epidemiologic study in which a group of persons with disease and a
group of persons without disease are identified with knowledge of prior exposure history
and compared with respect to exposure history is called a: - Correct Answer-
Retrospective study
In epidemiologic terms, the number of new cases per unit of person-time risk is known
as: - Correct Answer-Incidence rate
In epidemiologic terms, the number of actual cases of disease cases in a community at
a point in time is known as a: - Correct Answer-Prevalence risk
The presence in a community or region of cases of illness (or an outbreak) clearly in
excess of expected is defined as: - Correct Answer-Epidemic
Reducing microorganisms to a safe and acceptable level by the application of heat or
chemicals for a prescribed amount of time defines: - Correct Answer-Sanitation
Commercial mayonnaise is not a potentially hazardous food because: - Correct Answer-
The product has a low pH lower
Short term exposure to high levels of this contaminate can cause nausea, vomiting,
diarrhea, increase in blood pressure, and heart rate, and skin rashes: - Correct Answer-
Mercury poisoning
The process of killing all microorganisms, including spores, is known as: - Correct
Answer-Sterilization
Agents that act during pregnancy to produce a physical or functional defect in the
developing offspring are called: - Correct Answer-Teratogens
The poliomyelitis virus can potentially be isolated from all of the following except: -
Correct Answer-Insects
Which of the following is the primary reservoir for rabies in the united states? - Correct
Answer-Bats
, Which of the following mosquito species is a vector for the virus that causes dengue
fever? - Correct Answer-Aedes
The only infectious disease to have been actively eradicated by human beings is: -
Correct Answer-Smallpox
Children between the ages of 2 and 3 years old typically absorb what percentage of the
lead might they ingest? - Correct Answer-50%
Adults typically absorb approximately this percentage of lead they ingest? - Correct
Answer-20%
An explosive outbreak off illness with a short incubation period of a few minutes to less
than an hour might suggest: - Correct Answer-Cadmium or zinc poisoning
A local health dept releases info to a population of people that a wastewater cross
connection had, at some point, contaminated the water distribution system in their area.
The proper epidemiological study to compare this population to another population in an
unaffected part of town would be a: - Correct Answer-Case-control study
Sickness spread by the fecal-oral route or person to person contact that is facilitated by
the lack of personal hygiene is categorized as a: - Correct Answer-Water-washed
disease
Which of the following etiologic agents has been identified in imported raspberries and
lettuce from south American countries? - Correct Answer-Cyclospora cayetanesis
The long term consumption of water high in fluoride (8 to 20 mg/l) may negatively affect:
- Correct Answer-Bones
The most common waterborne disease in the world, with an estimated 600 million
people at risk and 300 million affected is: - Correct Answer-Schistosomiasis
The most important consideration when selecting a proper location for a well for a
private dwelling is: - Correct Answer-Performing a sanitary survey of the drainage area
Proper interpretation of available hydrologic and geologic data
Good well construction and location
Rocks that are formed by cooling and hardening of molten rock masses; such as quartz,
feldspar, and mica are classified as: - Correct Answer-Igneous
Karst areas are formed by movement of groundwater through: - Correct Answer-
Limestone
with 100% Correct Answers Latest
Update 2025 GRADED A+
Which of the following mosquito genuses is primarily the vector of malaria? - Correct
Answer-Anopheles
Although malaria is not a concern in the united states, the world health organization
(WHO) states that: - Correct Answer-Nearly 40% of the worlds population lives in
regions at risk for malaria
An estimated 500 million people per year become severely ill as a result of malaria
Most cases of malaria occur in some of the poorest countries
Sarcoptes scabiei, which is the vector causing scabies, is a: - Correct Answer-Mite
The etiologic agent causing lyme disease is: - Correct Answer-Borrella burgdorferi
Also known as woolsorters disease because of its association with sheep, this biological
agent has been targeted as a possible terrorist biological weapon: - Correct Answer-
Anthrax
The appropriate definition of environmental epidemiology is: - Correct Answer-The study
of factors influencing the distribution and determinants of disease
Health dept require that dogs or other animals that have bitten a human shall be
quarantined for: - Correct Answer-10 days
Dr John Snow, a London physician, is known as the father of field epidemiology due to
his investigation of the broad street well which uncovered the cause of an epidemic of: -
Correct Answer-Cholera
This microbiologist was first isolate the bacteria that caused the epidemic in London.
While studying similar outbreaks along the elbe river in Germany, he found that the city
of altona filtered their water before drinking and had a much lower morbidity rate than
other cities on the river. - Correct Answer-Robert Koch
As a result of the findings in altona, Germany and many similar efforts, water treatment
has eliminated many rampant diseases in developing areas of the world. Which of the
following is not a disease that water treatment has helped eliminate? - Correct Answer-
Hep A
,Evisceration and cold storage of chickens at 3 degrees Celsius (37.4 degrees
Fahrenheit) may cause an increase in numbers of these bacteria. - Correct Answer-
Aeromonas hydrophila
The constant presence of a disease or infectious agent within a given geographic area
defines: - Correct Answer-Endemic
Which of the following is an example of direct transmission of an infectious agent? -
Correct Answer-Droplets transmitted by coughing on a person
An observational epidemiologic study in which a group of persons with disease and a
group of persons without disease are identified with knowledge of prior exposure history
and compared with respect to exposure history is called a: - Correct Answer-
Retrospective study
In epidemiologic terms, the number of new cases per unit of person-time risk is known
as: - Correct Answer-Incidence rate
In epidemiologic terms, the number of actual cases of disease cases in a community at
a point in time is known as a: - Correct Answer-Prevalence risk
The presence in a community or region of cases of illness (or an outbreak) clearly in
excess of expected is defined as: - Correct Answer-Epidemic
Reducing microorganisms to a safe and acceptable level by the application of heat or
chemicals for a prescribed amount of time defines: - Correct Answer-Sanitation
Commercial mayonnaise is not a potentially hazardous food because: - Correct Answer-
The product has a low pH lower
Short term exposure to high levels of this contaminate can cause nausea, vomiting,
diarrhea, increase in blood pressure, and heart rate, and skin rashes: - Correct Answer-
Mercury poisoning
The process of killing all microorganisms, including spores, is known as: - Correct
Answer-Sterilization
Agents that act during pregnancy to produce a physical or functional defect in the
developing offspring are called: - Correct Answer-Teratogens
The poliomyelitis virus can potentially be isolated from all of the following except: -
Correct Answer-Insects
Which of the following is the primary reservoir for rabies in the united states? - Correct
Answer-Bats
, Which of the following mosquito species is a vector for the virus that causes dengue
fever? - Correct Answer-Aedes
The only infectious disease to have been actively eradicated by human beings is: -
Correct Answer-Smallpox
Children between the ages of 2 and 3 years old typically absorb what percentage of the
lead might they ingest? - Correct Answer-50%
Adults typically absorb approximately this percentage of lead they ingest? - Correct
Answer-20%
An explosive outbreak off illness with a short incubation period of a few minutes to less
than an hour might suggest: - Correct Answer-Cadmium or zinc poisoning
A local health dept releases info to a population of people that a wastewater cross
connection had, at some point, contaminated the water distribution system in their area.
The proper epidemiological study to compare this population to another population in an
unaffected part of town would be a: - Correct Answer-Case-control study
Sickness spread by the fecal-oral route or person to person contact that is facilitated by
the lack of personal hygiene is categorized as a: - Correct Answer-Water-washed
disease
Which of the following etiologic agents has been identified in imported raspberries and
lettuce from south American countries? - Correct Answer-Cyclospora cayetanesis
The long term consumption of water high in fluoride (8 to 20 mg/l) may negatively affect:
- Correct Answer-Bones
The most common waterborne disease in the world, with an estimated 600 million
people at risk and 300 million affected is: - Correct Answer-Schistosomiasis
The most important consideration when selecting a proper location for a well for a
private dwelling is: - Correct Answer-Performing a sanitary survey of the drainage area
Proper interpretation of available hydrologic and geologic data
Good well construction and location
Rocks that are formed by cooling and hardening of molten rock masses; such as quartz,
feldspar, and mica are classified as: - Correct Answer-Igneous
Karst areas are formed by movement of groundwater through: - Correct Answer-
Limestone
