REHS EXAM
QUESTIONS WITH CORRECT
ANSWERS 2026/2027 LATEST UPDATE
GRADED A+
1. 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
2. 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
3. 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
1
,4. 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
5. 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
6. 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
7. 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
2
,well casings properly
8. 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 - CORRECT ANSWER>>>>tincture of
iodine
9. 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
10. 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
11. The four major causes of death among all age groups of Americans include all
of the following
except.
3
, a. homicide
b. accidents
c. malignant neoplasms
d. heart disease - CORRECT ANSWER>>>>homicide
12. In recent years, the largest number of rabies cases were associated with
a. skunks
b. bats
c. dogs
d. raccons. - CORRECT ANSWER>>>>skunks
13. Asbestosis is caused by fine silicate fibers retained in the
a. kidneys
b. lungs
c. colon
d. abdomen - CORRECT ANSWER>>>>lungs
14. 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
15. Rocky mountain spotted fever is spread by
4
QUESTIONS WITH CORRECT
ANSWERS 2026/2027 LATEST UPDATE
GRADED A+
1. 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
2. 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
3. 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
1
,4. 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
5. 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
6. 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
7. 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
2
,well casings properly
8. 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 - CORRECT ANSWER>>>>tincture of
iodine
9. 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
10. 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
11. The four major causes of death among all age groups of Americans include all
of the following
except.
3
, a. homicide
b. accidents
c. malignant neoplasms
d. heart disease - CORRECT ANSWER>>>>homicide
12. In recent years, the largest number of rabies cases were associated with
a. skunks
b. bats
c. dogs
d. raccons. - CORRECT ANSWER>>>>skunks
13. Asbestosis is caused by fine silicate fibers retained in the
a. kidneys
b. lungs
c. colon
d. abdomen - CORRECT ANSWER>>>>lungs
14. 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
15. Rocky mountain spotted fever is spread by
4
