Alberta Water Treatment Operator Level 1 Certification
Exam Questions And Correct Answers
1. What is the primary purpose of a water treatment plant?
a) Increase water pressure
b) Improve aesthetic quality only
c) Remove contaminants to provide safe drinking water
d) Store water for industrial use
Rationale: The main purpose of water treatment is to remove physical,
chemical, and biological contaminants to ensure water is safe for human
consumption.
2. Which of the following is a common coagulant used in water
treatment?
a) Sodium chloride
b) Aluminum sulfate (alum)
c) Chlorine gas
d) Calcium carbonate
Rationale: Aluminum sulfate, commonly called alum, is used to destabilize
suspended particles and aid in their removal.
3. What is the primary function of coagulation in water treatment?
a) Disinfect water
b) Aggregate fine particles into larger ones for removal
c) Adjust pH
d) Remove dissolved minerals
Rationale: Coagulation causes small, suspended particles to clump together
into larger flocs that can settle out more easily.
4. Flocculation in water treatment is best described as:
a) Rapid mixing of chemicals
b) Gentle stirring to encourage floc formation
c) Filtration of water
, d) Aeration to remove gases
Rationale: Flocculation uses slow, controlled mixing to allow coagulated
particles to form larger, settleable flocs.
5. What is the primary purpose of sedimentation?
a) Remove settled flocs from water
b) Disinfect water
c) Adjust pH
d) Add coagulants
Rationale: Sedimentation allows flocculated particles to settle by gravity,
reducing turbidity.
6. Which type of filter media is most commonly used in rapid sand filters?
a) Activated carbon
b) Sand
c) Gravel only
d) Anthracite only
Rationale: Rapid sand filters use a layer of sand as the primary filtering
medium, often supported by gravel.
7. What is the typical particle size removed by conventional
filtration?
a) 0.001–0.01 mm
b) 0.01–0.1 mm
c) 1–5 mm
d) 5–10 mm
Rationale: Filtration is designed to remove fine suspended particles in the
range of 0.01–0.1 mm.
8. What is the primary disinfectant used in Alberta water treatment facilities?
a) Ozone
b) Chlorine
c) Iodine
d) Ultraviolet light
Rationale: Chlorine is widely used because it is effective against bacteria
, and viruses and provides a residual in the distribution system.
9. Which of the following is a byproduct of chlorination?
a) Fluoride
b) Trihalomethanes (THMs)
c) Aluminum sulfate
d) Calcium carbonate
Rationale: THMs are disinfection byproducts formed when chlorine reacts
with natural organic matter.
10. What is the typical pH range for finished drinking water?
a) 3–5
b) 6.5–8.5
c) 9–10
d) 10–12
Rationale: Maintaining pH between 6.5 and 8.5 prevents corrosion and
ensures water stability.
11. What is turbidity a measure of?
a) Color of water
b) Cloudiness caused by suspended particles
c) Taste and odor
d) Dissolved oxygen
Rationale: Turbidity quantifies how clear or cloudy water appears due to
suspended solids.
12. What is the primary purpose of a pH adjustment in water
treatment?
a) Disinfect water
b) Prevent corrosion and optimize chemical reactions
c) Remove suspended solids
d) Increase water temperature
Rationale: pH adjustment ensures chemicals like coagulants work
effectively and protects pipes from corrosion.
Exam Questions And Correct Answers
1. What is the primary purpose of a water treatment plant?
a) Increase water pressure
b) Improve aesthetic quality only
c) Remove contaminants to provide safe drinking water
d) Store water for industrial use
Rationale: The main purpose of water treatment is to remove physical,
chemical, and biological contaminants to ensure water is safe for human
consumption.
2. Which of the following is a common coagulant used in water
treatment?
a) Sodium chloride
b) Aluminum sulfate (alum)
c) Chlorine gas
d) Calcium carbonate
Rationale: Aluminum sulfate, commonly called alum, is used to destabilize
suspended particles and aid in their removal.
3. What is the primary function of coagulation in water treatment?
a) Disinfect water
b) Aggregate fine particles into larger ones for removal
c) Adjust pH
d) Remove dissolved minerals
Rationale: Coagulation causes small, suspended particles to clump together
into larger flocs that can settle out more easily.
4. Flocculation in water treatment is best described as:
a) Rapid mixing of chemicals
b) Gentle stirring to encourage floc formation
c) Filtration of water
, d) Aeration to remove gases
Rationale: Flocculation uses slow, controlled mixing to allow coagulated
particles to form larger, settleable flocs.
5. What is the primary purpose of sedimentation?
a) Remove settled flocs from water
b) Disinfect water
c) Adjust pH
d) Add coagulants
Rationale: Sedimentation allows flocculated particles to settle by gravity,
reducing turbidity.
6. Which type of filter media is most commonly used in rapid sand filters?
a) Activated carbon
b) Sand
c) Gravel only
d) Anthracite only
Rationale: Rapid sand filters use a layer of sand as the primary filtering
medium, often supported by gravel.
7. What is the typical particle size removed by conventional
filtration?
a) 0.001–0.01 mm
b) 0.01–0.1 mm
c) 1–5 mm
d) 5–10 mm
Rationale: Filtration is designed to remove fine suspended particles in the
range of 0.01–0.1 mm.
8. What is the primary disinfectant used in Alberta water treatment facilities?
a) Ozone
b) Chlorine
c) Iodine
d) Ultraviolet light
Rationale: Chlorine is widely used because it is effective against bacteria
, and viruses and provides a residual in the distribution system.
9. Which of the following is a byproduct of chlorination?
a) Fluoride
b) Trihalomethanes (THMs)
c) Aluminum sulfate
d) Calcium carbonate
Rationale: THMs are disinfection byproducts formed when chlorine reacts
with natural organic matter.
10. What is the typical pH range for finished drinking water?
a) 3–5
b) 6.5–8.5
c) 9–10
d) 10–12
Rationale: Maintaining pH between 6.5 and 8.5 prevents corrosion and
ensures water stability.
11. What is turbidity a measure of?
a) Color of water
b) Cloudiness caused by suspended particles
c) Taste and odor
d) Dissolved oxygen
Rationale: Turbidity quantifies how clear or cloudy water appears due to
suspended solids.
12. What is the primary purpose of a pH adjustment in water
treatment?
a) Disinfect water
b) Prevent corrosion and optimize chemical reactions
c) Remove suspended solids
d) Increase water temperature
Rationale: pH adjustment ensures chemicals like coagulants work
effectively and protects pipes from corrosion.
