AWWA INDUSRIAL WATER TREATMENT
OPERATOR CERTIFICATION EXAM QUESTIONS AND
CORRECT ANSWERS (VERIFIED ANSWERS Q&A
2026 |INSTANT DOWNLOAD PDF
1. What is the primary purpose of industrial water treatment?
A. Increase water color
B. Remove impurities and ensure safe use
C. Add minerals only
D. Increase water temperature
Rationale: Treatment ensures safety and usability of water.
Correct answer: B
2. Which process removes suspended solids by gravity?
A. Filtration
B. Sedimentation
C. Chlorination
D. Aeration
Rationale: Sedimentation allows solids to settle.
Correct answer: B
3. Coagulation is used to:
A. Kill bacteria
B. Neutralize pH
C. Form flocs from small particles
D. Add oxygen
,Rationale: Coagulation destabilizes particles.
Correct answer: C
4. The chemical commonly used for disinfection is:
A. Sodium chloride
B. Chlorine
C. Calcium carbonate
D. Ammonia
Rationale: Chlorine kills pathogens effectively.
Correct answer: B
5. Filtration primarily removes:
A. Dissolved gases
B. Large rocks only
C. Suspended particles
D. Metals in solution
Rationale: Filters trap suspended solids.
Correct answer: C
6. pH measures:
A. Water temperature
B. Acidity or alkalinity
C. Hardness
D. Turbidity
Rationale: pH indicates hydrogen ion concentration.
Correct answer: B
7. Hard water contains high levels of:
A. Oxygen
B. Calcium and magnesium
, C. Chlorine
D. Nitrogen
Rationale: Hardness is due to Ca and Mg ions.
Correct answer: B
8. Turbidity refers to:
A. Water color
B. Water odor
C. Cloudiness caused by particles
D. Water taste
Rationale: Turbidity measures clarity.
Correct answer: C
9. The main goal of flocculation is to:
A. Break particles apart
B. Combine small flocs into larger ones
C. Add disinfectants
D. Increase oxygen
Rationale: Flocculation aggregates particles.
Correct answer: B
10. Chlorine effectiveness decreases when water is:
A. Clear
B. Warm
C. High pH
D. Filtered
Rationale: High pH reduces disinfection efficiency.
Correct answer: C
OPERATOR CERTIFICATION EXAM QUESTIONS AND
CORRECT ANSWERS (VERIFIED ANSWERS Q&A
2026 |INSTANT DOWNLOAD PDF
1. What is the primary purpose of industrial water treatment?
A. Increase water color
B. Remove impurities and ensure safe use
C. Add minerals only
D. Increase water temperature
Rationale: Treatment ensures safety and usability of water.
Correct answer: B
2. Which process removes suspended solids by gravity?
A. Filtration
B. Sedimentation
C. Chlorination
D. Aeration
Rationale: Sedimentation allows solids to settle.
Correct answer: B
3. Coagulation is used to:
A. Kill bacteria
B. Neutralize pH
C. Form flocs from small particles
D. Add oxygen
,Rationale: Coagulation destabilizes particles.
Correct answer: C
4. The chemical commonly used for disinfection is:
A. Sodium chloride
B. Chlorine
C. Calcium carbonate
D. Ammonia
Rationale: Chlorine kills pathogens effectively.
Correct answer: B
5. Filtration primarily removes:
A. Dissolved gases
B. Large rocks only
C. Suspended particles
D. Metals in solution
Rationale: Filters trap suspended solids.
Correct answer: C
6. pH measures:
A. Water temperature
B. Acidity or alkalinity
C. Hardness
D. Turbidity
Rationale: pH indicates hydrogen ion concentration.
Correct answer: B
7. Hard water contains high levels of:
A. Oxygen
B. Calcium and magnesium
, C. Chlorine
D. Nitrogen
Rationale: Hardness is due to Ca and Mg ions.
Correct answer: B
8. Turbidity refers to:
A. Water color
B. Water odor
C. Cloudiness caused by particles
D. Water taste
Rationale: Turbidity measures clarity.
Correct answer: C
9. The main goal of flocculation is to:
A. Break particles apart
B. Combine small flocs into larger ones
C. Add disinfectants
D. Increase oxygen
Rationale: Flocculation aggregates particles.
Correct answer: B
10. Chlorine effectiveness decreases when water is:
A. Clear
B. Warm
C. High pH
D. Filtered
Rationale: High pH reduces disinfection efficiency.
Correct answer: C
