REHS EXAM 2025 ACTUAL QUESTIONS
WITH VERIFIED CORRECT ANSWERS
100% RATED
1. A factor or agent which increases the risk of cancer is known as a
a. teratogen
b. mutagen
c. carcinogen
d. fomite - CORRECT ANSWER>>>>carcinogen
2. The four major causes of death among all age groups of Americans include all
of the following
except.
a. homicide
b. accidents
c. malignant neoplasms
d. heart disease - CORRECT ANSWER>>>>homicide
3. In recent years, the largest number of rabies cases were associated with
a. skunks
b. bats
c. dogs
d. raccons. - CORRECT ANSWER>>>>skunks
4. Asbestosis is caused by fine silicate fibers retained in the
a. kidneys
b. lungs
c. colon
d. abdomen - CORRECT ANSWER>>>>lungs
5. An illness due to a specific infectious agent or its toxic product which is
transmitted from a
reservoir to a susceptible host either directly or indirectly is called
a. an infectious disease
b. a communicable disease
c. a genetic disease
d. a noncommunicable disease - CORRECT ANSWER>>>>a communicable
disease
1
,6. Rocky mountain spotted fever is spread by
a. flies
b. spiders
c. cockroaches
d. ticks - CORRECT ANSWER>>>>ticks
7. Mycotoxins are poisonous chemicals produced by
a. bacteria
b. vertebrates
c. viruses
d. fungi - CORRECT ANSWER>>>>fungi
8. The study of the occurrence, frequency, and distribution of disease is
a. entomology
b. biology
c. endocrinology
d. epidemiology - CORRECT ANSWER>>>>epidemiology
9. Which of the following organisms are most resistant to unfavorable
environmental conditions and indicate
past or possibly intermittent pollution?
a. fecal streptococci
b. escherichia coli
c. aerobacter aerogenes
d. clostridium sporulates - CORRECT ANSWER>>>>clostridium sporulates
10. Engineering controls are
a. controls that isolate or remove hazards from the work place
b. less effective than good training
c. the last option that should be considered
d. less effective than personal protection processes - CORRECT
ANSWER>>>>controls that isolate or remove hazards from the workplace
11. Which of the following is not considered a satisfactory solution to the problem
of chemical contamination in
Well systems?
a. abandoning the well
b. boiling the water
c. building a new, properly constructed, drilled well - CORRECT
ANSWER>>>>boiling the water
2
,12. Which of the following chemicals is most widely used to destroy
microorganisms?
a. chlorine
b. copper sulfate
c. chloramine
d. hydrogen sulfate - CORRECT ANSWER>>>>chlorine
13. Which of the following is not a practical method for removal of cadmium?
a. ion exchange
b. lime softening
c. reverse osmosis
d. iron coagulation - CORRECT ANSWER>>>>reverse osmosis
14. Which of the following is not a commonly accepted method of device to
prevent backsiphonage?
a. vacuum breakers
b. cross-connections
c. air gap separation
d. back pressure units - CORRECT ANSWER>>>>cross-connections
15. This substance is the first product of the decomposition of organic matter. Its
presence in water usually
Indicates "fresh pollution" of sanitary significance. What is it?
a. ammonia
b. sugar
c. carbon dioxide
d. hydrogen sulfide - CORRECT ANSWER>>>>ammonia
16. One of the most common reasons for the contamination of wells drilled
through rock, clay, or hardpan is
a. seepage of pollutants through soil
b. failure to seal well casings properly
c. porosity of the rock
d. use of inferior quality well casings - CORRECT ANSWER>>>>failure to seal
well casings properly
17. In emergencies, small quantities of water can be disinfected by boiling or using
a. aluminum salts
b. tincture of iodine
3
, c. salt tablets
d. direct exposure to sunlight for 22 hours - CORRECT ANSWER>>>>tincture of
iodine
18. Back flow of nonpotable materials into the potable water system may occur by
a. back pressure
b. backsiphonage
c. vacuum in the volume
d. a and b above - CORRECT ANSWER>>>>a and b above
19. Which of the following statements should not be a consideration in locating a
groundwater supply?
a. the probable travel of pollution through the ground
b. the well construction practices and standards
c. the sanitary seal provided at the point where the pump lines pass out of the
casing
d. the distance that the water will need to travel - CORRECT ANSWER>>>>the
distance that the water will need to travel
20. It is known that some common pathogenic organisms found in wastewater will
survive more than ____
of harsh temperature extremes
a. 2 months
b. 5 months
c. 2 years
d. 5 years - CORRECT ANSWER>>>>2 years
21. A storm sewer is used to
a. remove rain or other standing surface water
b. remove sewage and storm water
c. remove household water waste and gutter drain water
d. remove non-toxic, non-hazardous wastewater - CORRECT
ANSWER>>>>remove rain or other standing surface water
22. Stream pollution is sometimes apparent by
a. increased levels of available oxygen in the water
b. a zone of degradation
c. large numbers of crayfish and cristivomer species
d. large numbers of small fish - CORRECT ANSWER>>>>a zone of degradation
4
WITH VERIFIED CORRECT ANSWERS
100% RATED
1. A factor or agent which increases the risk of cancer is known as a
a. teratogen
b. mutagen
c. carcinogen
d. fomite - CORRECT ANSWER>>>>carcinogen
2. The four major causes of death among all age groups of Americans include all
of the following
except.
a. homicide
b. accidents
c. malignant neoplasms
d. heart disease - CORRECT ANSWER>>>>homicide
3. In recent years, the largest number of rabies cases were associated with
a. skunks
b. bats
c. dogs
d. raccons. - CORRECT ANSWER>>>>skunks
4. Asbestosis is caused by fine silicate fibers retained in the
a. kidneys
b. lungs
c. colon
d. abdomen - CORRECT ANSWER>>>>lungs
5. An illness due to a specific infectious agent or its toxic product which is
transmitted from a
reservoir to a susceptible host either directly or indirectly is called
a. an infectious disease
b. a communicable disease
c. a genetic disease
d. a noncommunicable disease - CORRECT ANSWER>>>>a communicable
disease
1
,6. Rocky mountain spotted fever is spread by
a. flies
b. spiders
c. cockroaches
d. ticks - CORRECT ANSWER>>>>ticks
7. Mycotoxins are poisonous chemicals produced by
a. bacteria
b. vertebrates
c. viruses
d. fungi - CORRECT ANSWER>>>>fungi
8. The study of the occurrence, frequency, and distribution of disease is
a. entomology
b. biology
c. endocrinology
d. epidemiology - CORRECT ANSWER>>>>epidemiology
9. Which of the following organisms are most resistant to unfavorable
environmental conditions and indicate
past or possibly intermittent pollution?
a. fecal streptococci
b. escherichia coli
c. aerobacter aerogenes
d. clostridium sporulates - CORRECT ANSWER>>>>clostridium sporulates
10. Engineering controls are
a. controls that isolate or remove hazards from the work place
b. less effective than good training
c. the last option that should be considered
d. less effective than personal protection processes - CORRECT
ANSWER>>>>controls that isolate or remove hazards from the workplace
11. Which of the following is not considered a satisfactory solution to the problem
of chemical contamination in
Well systems?
a. abandoning the well
b. boiling the water
c. building a new, properly constructed, drilled well - CORRECT
ANSWER>>>>boiling the water
2
,12. Which of the following chemicals is most widely used to destroy
microorganisms?
a. chlorine
b. copper sulfate
c. chloramine
d. hydrogen sulfate - CORRECT ANSWER>>>>chlorine
13. Which of the following is not a practical method for removal of cadmium?
a. ion exchange
b. lime softening
c. reverse osmosis
d. iron coagulation - CORRECT ANSWER>>>>reverse osmosis
14. Which of the following is not a commonly accepted method of device to
prevent backsiphonage?
a. vacuum breakers
b. cross-connections
c. air gap separation
d. back pressure units - CORRECT ANSWER>>>>cross-connections
15. This substance is the first product of the decomposition of organic matter. Its
presence in water usually
Indicates "fresh pollution" of sanitary significance. What is it?
a. ammonia
b. sugar
c. carbon dioxide
d. hydrogen sulfide - CORRECT ANSWER>>>>ammonia
16. One of the most common reasons for the contamination of wells drilled
through rock, clay, or hardpan is
a. seepage of pollutants through soil
b. failure to seal well casings properly
c. porosity of the rock
d. use of inferior quality well casings - CORRECT ANSWER>>>>failure to seal
well casings properly
17. In emergencies, small quantities of water can be disinfected by boiling or using
a. aluminum salts
b. tincture of iodine
3
, c. salt tablets
d. direct exposure to sunlight for 22 hours - CORRECT ANSWER>>>>tincture of
iodine
18. Back flow of nonpotable materials into the potable water system may occur by
a. back pressure
b. backsiphonage
c. vacuum in the volume
d. a and b above - CORRECT ANSWER>>>>a and b above
19. Which of the following statements should not be a consideration in locating a
groundwater supply?
a. the probable travel of pollution through the ground
b. the well construction practices and standards
c. the sanitary seal provided at the point where the pump lines pass out of the
casing
d. the distance that the water will need to travel - CORRECT ANSWER>>>>the
distance that the water will need to travel
20. It is known that some common pathogenic organisms found in wastewater will
survive more than ____
of harsh temperature extremes
a. 2 months
b. 5 months
c. 2 years
d. 5 years - CORRECT ANSWER>>>>2 years
21. A storm sewer is used to
a. remove rain or other standing surface water
b. remove sewage and storm water
c. remove household water waste and gutter drain water
d. remove non-toxic, non-hazardous wastewater - CORRECT
ANSWER>>>>remove rain or other standing surface water
22. Stream pollution is sometimes apparent by
a. increased levels of available oxygen in the water
b. a zone of degradation
c. large numbers of crayfish and cristivomer species
d. large numbers of small fish - CORRECT ANSWER>>>>a zone of degradation
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