REHS Retest Placement test Exam Questions with complete solutions 2024/2025
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REHS
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REHS
REHS Retest Placement test Exam Questions with complete solutions 2024/2025
1. 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, dri...
REHS Retest Placement test Exam
Questions with complete solutions
2024/2025
1. 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. 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
3. 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
,4. 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
5. 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
6. 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
7. 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
8. 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
9. 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
10. 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
, 11. 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
12. 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
13. If the septic tank will also have a garbage disposal unit
feeding into it
a. the size of the tank would be increased by 50 percent
b. the tank should have an agiator
c. the tank should not be equipped with a gas baffle
d. the tank should not be constructed with precast concrete -
correct answer the size of the tank would be increased by 50
percent
14. How often should a septic tank for a private home be
serviced?
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