REHS Exam Questions and Detailed
Correct Answers
1. A factor or agent which increases the risk of cancer is known as a
a. teratogen
b. mutagen
c. carcinogen
d. fomite - 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 - Answer: homicide
3. In recent years, the largest number of rabies cases were associated with
a. skunks
b. bats
c. dogs
d. raccons. - Answer: skunks
4. Asbestosis is caused by fine silicate fibers retained in the
a. kidneys
b. lungs
c. colon
d. abdomen - 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 - Answer: a communicable disease
6. Rocky mountain spotted fever is spread by
a. flies
b. spiders
c. cockroaches
d. ticks - Answer: ticks
7. Mycotoxins are poisonous chemicals produced by
a. bacteria
b. vertebrates
c. viruses
d. fungi - Answer: fungi
8. The study of the occurrence, frequency, and distribution of disease is
a. entomology
b. biology
c. endocrinology
d. epidemiology - 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 - 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 - 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 - Answer: boiling the water
12. Which of the following chemicals is most widely used to destroy microorganisms?
a. chlorine
b. copper sulfate
c. chloramine
d. hydrogen sulfate - 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 - 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 - 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 - 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 - 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
c. salt tablets
d. direct exposure to sunlight for 22 hours - 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 - 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
Correct Answers
1. A factor or agent which increases the risk of cancer is known as a
a. teratogen
b. mutagen
c. carcinogen
d. fomite - 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 - Answer: homicide
3. In recent years, the largest number of rabies cases were associated with
a. skunks
b. bats
c. dogs
d. raccons. - Answer: skunks
4. Asbestosis is caused by fine silicate fibers retained in the
a. kidneys
b. lungs
c. colon
d. abdomen - 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 - Answer: a communicable disease
6. Rocky mountain spotted fever is spread by
a. flies
b. spiders
c. cockroaches
d. ticks - Answer: ticks
7. Mycotoxins are poisonous chemicals produced by
a. bacteria
b. vertebrates
c. viruses
d. fungi - Answer: fungi
8. The study of the occurrence, frequency, and distribution of disease is
a. entomology
b. biology
c. endocrinology
d. epidemiology - 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 - 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 - 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 - Answer: boiling the water
12. Which of the following chemicals is most widely used to destroy microorganisms?
a. chlorine
b. copper sulfate
c. chloramine
d. hydrogen sulfate - 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 - 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 - 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 - 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 - 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
c. salt tablets
d. direct exposure to sunlight for 22 hours - 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 - 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
