SOUTH CAROLINA
PHYSICAL/CHEMICAL
WASTEWATER OPERATOR CLASS
C PRACTICE EXAM COMPLETE
(100 QUESTIONS WITH
OBJECTIVELY CORRECT
ANSWERS AND DETAILED
RATIONALES
1. The primary purpose of physical/chemical treatment is to:
A. Add bacteria
B. Remove contaminants using chemical and physical processes
C. Increase pollution
D. Store water
Correct Answer: B
Rationale: These systems remove solids, metals, and other pollutants
without relying on biological processes.
2. Coagulation is the process of:
,A. Removing bacteria
B. Destabilizing suspended particles
C. Filtering water
D. Aerating water
Correct Answer: B
Rationale: Chemicals neutralize particle charges to allow aggregation.
3. Flocculation follows coagulation and involves:
A. Rapid mixing
B. Gentle mixing to form flocs
C. Filtration
D. Disinfection
Correct Answer: B
Rationale: Gentle mixing allows particles to form larger clumps.
4. Common coagulants include:
A. Oxygen
B. Alum and ferric chloride
C. Nitrogen
D. Carbon dioxide
,Correct Answer: B
Rationale: These chemicals neutralize particle charges.
5. A jar test is used to:
A. Measure flow
B. Determine optimal chemical dosage
C. Measure temperature
D. Test bacteria
Correct Answer: B
Rationale: Helps select proper coagulant dose.
6. pH affects coagulation by:
A. Having no effect
B. Influencing chemical effectiveness
C. Increasing flow
D. Reducing mixing
Correct Answer: B
Rationale: Each coagulant works best within a pH range.
, 7. Alkalinity is important because it:
A. Reduces flow
B. Buffers pH changes
C. Increases solids
D. Removes oxygen
Correct Answer: B
Rationale: Stabilizes pH during treatment.
8. Rapid mixing is used to:
A. Form flocs
B. Disperse chemicals quickly
C. Filter water
D. Remove solids
Correct Answer: B
Rationale: Ensures even distribution of coagulants.
9. Sedimentation removes:
A. Dissolved gases
B. Settled solids
PHYSICAL/CHEMICAL
WASTEWATER OPERATOR CLASS
C PRACTICE EXAM COMPLETE
(100 QUESTIONS WITH
OBJECTIVELY CORRECT
ANSWERS AND DETAILED
RATIONALES
1. The primary purpose of physical/chemical treatment is to:
A. Add bacteria
B. Remove contaminants using chemical and physical processes
C. Increase pollution
D. Store water
Correct Answer: B
Rationale: These systems remove solids, metals, and other pollutants
without relying on biological processes.
2. Coagulation is the process of:
,A. Removing bacteria
B. Destabilizing suspended particles
C. Filtering water
D. Aerating water
Correct Answer: B
Rationale: Chemicals neutralize particle charges to allow aggregation.
3. Flocculation follows coagulation and involves:
A. Rapid mixing
B. Gentle mixing to form flocs
C. Filtration
D. Disinfection
Correct Answer: B
Rationale: Gentle mixing allows particles to form larger clumps.
4. Common coagulants include:
A. Oxygen
B. Alum and ferric chloride
C. Nitrogen
D. Carbon dioxide
,Correct Answer: B
Rationale: These chemicals neutralize particle charges.
5. A jar test is used to:
A. Measure flow
B. Determine optimal chemical dosage
C. Measure temperature
D. Test bacteria
Correct Answer: B
Rationale: Helps select proper coagulant dose.
6. pH affects coagulation by:
A. Having no effect
B. Influencing chemical effectiveness
C. Increasing flow
D. Reducing mixing
Correct Answer: B
Rationale: Each coagulant works best within a pH range.
, 7. Alkalinity is important because it:
A. Reduces flow
B. Buffers pH changes
C. Increases solids
D. Removes oxygen
Correct Answer: B
Rationale: Stabilizes pH during treatment.
8. Rapid mixing is used to:
A. Form flocs
B. Disperse chemicals quickly
C. Filter water
D. Remove solids
Correct Answer: B
Rationale: Ensures even distribution of coagulants.
9. Sedimentation removes:
A. Dissolved gases
B. Settled solids
