Québec Certificat en traitement des
eaux et milieux aquatiques Exam
Practice Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. What is the primary purpose of coagulation in water treatment?
A. Remove dissolved salts
B. Kill microorganisms
C. Destabilize particles
D. Adjust pH
Answer: C
Coagulation neutralizes charges on particles, allowing them to clump
together for removal.
2. Which chemical is most commonly used as a coagulant?
A. Sodium chloride
B. Aluminum sulfate
C. Calcium carbonate
, D. Potassium nitrate
Answer: B
Aluminum sulfate (alum) is widely used to destabilize suspended
particles.
3. What process follows coagulation?
A. Filtration
B. Disinfection
C. Flocculation
D. Aeration
Answer: C
Flocculation gently mixes water to form larger flocs from destabilized
particles.
4. What is turbidity a measure of?
A. Chemical contamination
B. Cloudiness of water
C. Temperature
D. Dissolved oxygen
Answer: B
Turbidity indicates the presence of suspended particles affecting
clarity.
5. Which unit measures turbidity?
A. mg/L
B. NTU
, C. pH
D. ppm
Answer: B
Nephelometric Turbidity Units (NTU) quantify water clarity.
6. What is the main goal of disinfection?
A. Remove solids
B. Kill pathogens
C. Adjust taste
D. Reduce hardness
Answer: B
Disinfection eliminates harmful microorganisms.
7. Which disinfectant is most commonly used in municipal systems?
A. Ozone
B. Chlorine
C. UV light
D. Iodine
Answer: B
Chlorine is widely used due to effectiveness and residual protection.
8. What does pH measure?
A. Oxygen level
B. Acidity or alkalinity
C. Turbidity
D. Hardness
, Answer: B
pH indicates hydrogen ion concentration in water.
9. What is considered neutral pH?
A. 0
B. 5
C. 7
D. 14
Answer: C
A pH of 7 represents neutrality.
10. What process removes dissolved gases?
A. Sedimentation
B. Aeration
C. Filtration
D. Chlorination
Answer: B
Aeration strips gases like CO₂ and H₂S from water.
11. What is sedimentation?
A. Chemical reaction
B. Particle settling process
C. Gas removal
D. Disinfection step
Answer: B
Sedimentation allows heavier particles to settle out by gravity.
eaux et milieux aquatiques Exam
Practice Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. What is the primary purpose of coagulation in water treatment?
A. Remove dissolved salts
B. Kill microorganisms
C. Destabilize particles
D. Adjust pH
Answer: C
Coagulation neutralizes charges on particles, allowing them to clump
together for removal.
2. Which chemical is most commonly used as a coagulant?
A. Sodium chloride
B. Aluminum sulfate
C. Calcium carbonate
, D. Potassium nitrate
Answer: B
Aluminum sulfate (alum) is widely used to destabilize suspended
particles.
3. What process follows coagulation?
A. Filtration
B. Disinfection
C. Flocculation
D. Aeration
Answer: C
Flocculation gently mixes water to form larger flocs from destabilized
particles.
4. What is turbidity a measure of?
A. Chemical contamination
B. Cloudiness of water
C. Temperature
D. Dissolved oxygen
Answer: B
Turbidity indicates the presence of suspended particles affecting
clarity.
5. Which unit measures turbidity?
A. mg/L
B. NTU
, C. pH
D. ppm
Answer: B
Nephelometric Turbidity Units (NTU) quantify water clarity.
6. What is the main goal of disinfection?
A. Remove solids
B. Kill pathogens
C. Adjust taste
D. Reduce hardness
Answer: B
Disinfection eliminates harmful microorganisms.
7. Which disinfectant is most commonly used in municipal systems?
A. Ozone
B. Chlorine
C. UV light
D. Iodine
Answer: B
Chlorine is widely used due to effectiveness and residual protection.
8. What does pH measure?
A. Oxygen level
B. Acidity or alkalinity
C. Turbidity
D. Hardness
, Answer: B
pH indicates hydrogen ion concentration in water.
9. What is considered neutral pH?
A. 0
B. 5
C. 7
D. 14
Answer: C
A pH of 7 represents neutrality.
10. What process removes dissolved gases?
A. Sedimentation
B. Aeration
C. Filtration
D. Chlorination
Answer: B
Aeration strips gases like CO₂ and H₂S from water.
11. What is sedimentation?
A. Chemical reaction
B. Particle settling process
C. Gas removal
D. Disinfection step
Answer: B
Sedimentation allows heavier particles to settle out by gravity.
