c. viruses
d. all of the above
all of the above
Question 24
Marks: 1
Which of the following is the more common and least expensive method of backflow control?
Choose one answer.
a. air gap separation
b. vacuum breaker
c. backflow preventer
d. barometric loops
air gap separation
Question 25
Marks: 1
Which of the following is (are) fundamental to the control of inorganic chemicals in drinking water?
Choose one answer.
a. sanitary survey
b. identification of the sources
c. determination of amounts of pollutants
d. all of the above
all of the above
Question 26
Marks: 1
Which of the following wells is considered the most dependable source of water and is less likely to become
contaminated?
Choose one answer.
, a. driven well
b. bored well
c. drilled well
d. dug well
drilled well
Question 27
Marks: 1
Which of the following factors contributes to water hardness?
Choose one answer.
a. high concentrations of iron
b. pond, creek, or other surface water
c. well-water supplies that are improperly constructed, protected, or located
d. dissolved bicarbonates, sulfates, and/or chlorides of magnesium and calcium in groundwater
dissolved bicarbonates, sulfates, and/or chlorides of magnesium and calcium in groundwater
Question 28
Marks: 1
The gas causing the distinct "rotten egg" odor in many water sources is
Choose one answer.
a. hydrogen sulfide
b. carbon dioxide
c. chlorine gas
d. hydrogen carbonate
hydrogen sulfide
Question 29
Marks: 1
What is desalination?
d. all of the above
all of the above
Question 24
Marks: 1
Which of the following is the more common and least expensive method of backflow control?
Choose one answer.
a. air gap separation
b. vacuum breaker
c. backflow preventer
d. barometric loops
air gap separation
Question 25
Marks: 1
Which of the following is (are) fundamental to the control of inorganic chemicals in drinking water?
Choose one answer.
a. sanitary survey
b. identification of the sources
c. determination of amounts of pollutants
d. all of the above
all of the above
Question 26
Marks: 1
Which of the following wells is considered the most dependable source of water and is less likely to become
contaminated?
Choose one answer.
, a. driven well
b. bored well
c. drilled well
d. dug well
drilled well
Question 27
Marks: 1
Which of the following factors contributes to water hardness?
Choose one answer.
a. high concentrations of iron
b. pond, creek, or other surface water
c. well-water supplies that are improperly constructed, protected, or located
d. dissolved bicarbonates, sulfates, and/or chlorides of magnesium and calcium in groundwater
dissolved bicarbonates, sulfates, and/or chlorides of magnesium and calcium in groundwater
Question 28
Marks: 1
The gas causing the distinct "rotten egg" odor in many water sources is
Choose one answer.
a. hydrogen sulfide
b. carbon dioxide
c. chlorine gas
d. hydrogen carbonate
hydrogen sulfide
Question 29
Marks: 1
What is desalination?
