ENVIRONMENTAL HEALTH SCIENCES
EXAM TEST BANK 2026-2027 — 200
PRACTICE QUESTIONS WITH
ANSWERS & EXPERT EXPLANATIONS
FOR NEHA REHS/RS, MPH, AND PUBLIC
HEALTH CERTIFICATION SUCCESS!
Description:
Master your Environmental Health Sciences exam with this comprehensive 2026/2027 test
bank featuring 200 expertly crafted multiple-choice questions, detailed answers, and in-depth
explanations covering water quality, food safety, air pollution, hazardous waste, and
epidemiology. Updated for current NEHA REHS/RS, APHA, and ASPPH curriculum
standards. Perfect for MPH students, public health professionals, and certification
candidates seeking high scores.
Download now and start your journey toward Environmental Health certification success with 200
real-world practice questions designed to boost your exam confidence and scores!" ⭐
, Environmental Health Exam Test Bank 2026-2027
SECTION A: ENVIRONMENTAL HEALTH FUNDAMENTALS
1. A factor or agent that increases the risk of developing cancer is referred to as a:
A. Teratogen
B. Mutagen
C. Carcinogen
D. Fomite
Answer: C. Carcinogen
Explanation: Carcinogens are substances or agents that directly promote the development of
cancer by causing cellular mutations, disrupting normal cellular growth regulation, or damaging
DNA. Teratogens cause birth defects, mutagens induce genetic mutations, and fomites are
inanimate objects that can transmit infectious agents.
2. The leading causes of mortality across all age groups in the United States include all of
the following EXCEPT:
A. Heart disease
B. Malignant neoplasms
C. Accidents
D. Homicide
Answer: D. Homicide
Explanation: The four major causes of death in the United States are heart disease, cancer,
chronic lower respiratory diseases, and accidents. Homicide, while a significant public health
concern, does not rank among the top four causes of mortality across all age groups.
,3. In recent epidemiological surveillance, the primary reservoir associated with the largest
number of rabies cases is:
A. Skunks
B. Bats
C. Dogs
D. Raccoons
Answer: B. Bats
Explanation: Bats have emerged as the leading source of rabies cases in the United States,
accounting for the majority of rabies virus variants identified in human cases. While raccoons,
skunks, and foxes are important terrestrial reservoirs, bats represent the primary source of rabies
virus exposure to humans and domestic animals.
4. Asbestosis results from the retention of fine silicate fibers in which organ system?
A. Kidneys
B. Lungs
C. Colon
D. Abdomen
Answer: B. Lungs
Explanation: Asbestosis is a chronic pulmonary condition caused by the inhalation and
prolonged retention of asbestos fibers in the lung tissue. The fibers induce progressive interstitial
fibrosis, leading to impaired gas exchange, respiratory dysfunction, and increased risk of
mesothelioma and lung cancer.
5. An illness caused by a specific infectious agent or its toxic products, transmitted from a
reservoir to a susceptible host through direct or indirect pathways, is classified as:
A. An infectious disease
B. A communicable disease
, C. A genetic disease
D. A noncommunicable disease
Answer: B. A communicable disease
Explanation: A communicable disease is specifically defined as an illness resulting from an
infectious agent that is transmitted from one host to another, either directly through contact or
indirectly through vectors, vehicles, or environmental reservoirs. This distinguishes it from
infectious diseases that may not be transmissible between hosts.
6. Rocky Mountain spotted fever is vectored by which arthropod?
A. Flies
B. Spiders
C. Cockroaches
D. Ticks
Answer: D. Ticks
Explanation: Rocky Mountain spotted fever is transmitted to humans through the bite of
infected ticks, primarily the American dog tick, Rocky Mountain wood tick, and brown dog tick.
The causative agent is the bacterium Rickettsia rickettsii.
7. Mycotoxins are toxic chemical compounds produced by which group of organisms?
A. Bacteria
B. Vertebrates
C. Viruses
D. Fungi
Answer: D. Fungi
Explanation: Mycotoxins are secondary metabolites produced by various fungal species,
including Aspergillus, Penicillium, and Fusarium genera. These compounds can contaminate
EXAM TEST BANK 2026-2027 — 200
PRACTICE QUESTIONS WITH
ANSWERS & EXPERT EXPLANATIONS
FOR NEHA REHS/RS, MPH, AND PUBLIC
HEALTH CERTIFICATION SUCCESS!
Description:
Master your Environmental Health Sciences exam with this comprehensive 2026/2027 test
bank featuring 200 expertly crafted multiple-choice questions, detailed answers, and in-depth
explanations covering water quality, food safety, air pollution, hazardous waste, and
epidemiology. Updated for current NEHA REHS/RS, APHA, and ASPPH curriculum
standards. Perfect for MPH students, public health professionals, and certification
candidates seeking high scores.
Download now and start your journey toward Environmental Health certification success with 200
real-world practice questions designed to boost your exam confidence and scores!" ⭐
, Environmental Health Exam Test Bank 2026-2027
SECTION A: ENVIRONMENTAL HEALTH FUNDAMENTALS
1. A factor or agent that increases the risk of developing cancer is referred to as a:
A. Teratogen
B. Mutagen
C. Carcinogen
D. Fomite
Answer: C. Carcinogen
Explanation: Carcinogens are substances or agents that directly promote the development of
cancer by causing cellular mutations, disrupting normal cellular growth regulation, or damaging
DNA. Teratogens cause birth defects, mutagens induce genetic mutations, and fomites are
inanimate objects that can transmit infectious agents.
2. The leading causes of mortality across all age groups in the United States include all of
the following EXCEPT:
A. Heart disease
B. Malignant neoplasms
C. Accidents
D. Homicide
Answer: D. Homicide
Explanation: The four major causes of death in the United States are heart disease, cancer,
chronic lower respiratory diseases, and accidents. Homicide, while a significant public health
concern, does not rank among the top four causes of mortality across all age groups.
,3. In recent epidemiological surveillance, the primary reservoir associated with the largest
number of rabies cases is:
A. Skunks
B. Bats
C. Dogs
D. Raccoons
Answer: B. Bats
Explanation: Bats have emerged as the leading source of rabies cases in the United States,
accounting for the majority of rabies virus variants identified in human cases. While raccoons,
skunks, and foxes are important terrestrial reservoirs, bats represent the primary source of rabies
virus exposure to humans and domestic animals.
4. Asbestosis results from the retention of fine silicate fibers in which organ system?
A. Kidneys
B. Lungs
C. Colon
D. Abdomen
Answer: B. Lungs
Explanation: Asbestosis is a chronic pulmonary condition caused by the inhalation and
prolonged retention of asbestos fibers in the lung tissue. The fibers induce progressive interstitial
fibrosis, leading to impaired gas exchange, respiratory dysfunction, and increased risk of
mesothelioma and lung cancer.
5. An illness caused by a specific infectious agent or its toxic products, transmitted from a
reservoir to a susceptible host through direct or indirect pathways, is classified as:
A. An infectious disease
B. A communicable disease
, C. A genetic disease
D. A noncommunicable disease
Answer: B. A communicable disease
Explanation: A communicable disease is specifically defined as an illness resulting from an
infectious agent that is transmitted from one host to another, either directly through contact or
indirectly through vectors, vehicles, or environmental reservoirs. This distinguishes it from
infectious diseases that may not be transmissible between hosts.
6. Rocky Mountain spotted fever is vectored by which arthropod?
A. Flies
B. Spiders
C. Cockroaches
D. Ticks
Answer: D. Ticks
Explanation: Rocky Mountain spotted fever is transmitted to humans through the bite of
infected ticks, primarily the American dog tick, Rocky Mountain wood tick, and brown dog tick.
The causative agent is the bacterium Rickettsia rickettsii.
7. Mycotoxins are toxic chemical compounds produced by which group of organisms?
A. Bacteria
B. Vertebrates
C. Viruses
D. Fungi
Answer: D. Fungi
Explanation: Mycotoxins are secondary metabolites produced by various fungal species,
including Aspergillus, Penicillium, and Fusarium genera. These compounds can contaminate
