AWWA LABORATORY ANALYST CERTIFICATION
EXAM QUESTIONS AND CORRECT ANSWERS
(VERIFIED ANSWERS Q&A 2026 |INSTANT
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1. What is the primary purpose of a laboratory analyst in a
water utility?
A. Operate pumping stations
B. Monitor and analyze water quality
C. Repair distribution pipes
D. Collect customer payments
Rationale: Laboratory analysts ensure water safety by testing
physical, chemical, and biological parameters.
Correct Answer: B. Monitor and analyze water quality
2. Which parameter is most commonly used to indicate
microbial contamination in water?
A. pH
B. Turbidity
C. Total coliform bacteria
D. Hardness
,Rationale: Coliform bacteria indicate possible fecal
contamination.
Correct Answer: C. Total coliform bacteria
3. What does pH measure in water?
A. Temperature
B. Acidity or alkalinity
C. Turbidity
D. Dissolved oxygen
Rationale: pH indicates hydrogen ion concentration.
Correct Answer: B. Acidity or alkalinity
4. Which instrument is commonly used to measure turbidity?
A. Spectrophotometer
B. Turbidimeter
C. pH meter
D. Conductivity meter
Rationale: A turbidimeter measures light scattering from
particles.
Correct Answer: B. Turbidimeter
5. What is the acceptable range of pH for drinking water
according to general standards?
,A. 0–4
B. 4–6
C. 6.5–8.5
D. 9–12
Rationale: Safe drinking water is typically near neutral.
Correct Answer: C. 6.5–8.5
6. What does BOD stand for?
A. Biological Oxygen Demand
B. Basic Oxygen Distribution
C. Biochemical Organic Dilution
D. Biological Oxidation Degree
Rationale: BOD measures oxygen used by microorganisms.
Correct Answer: A. Biological Oxygen Demand
7. Why is sample preservation important?
A. To increase color
B. To prevent changes before testing
C. To reduce cost
D. To improve taste
Rationale: Preservation maintains sample integrity.
Correct Answer: B. To prevent changes before testing
, 8. Which gas is most commonly measured in dissolved oxygen
tests?
A. Carbon dioxide
B. Oxygen
C. Nitrogen
D. Hydrogen
Rationale: DO measures oxygen dissolved in water.
Correct Answer: B. Oxygen
9. What is the main purpose of calibration of laboratory
instruments?
A. Clean equipment
B. Improve appearance
C. Ensure accurate readings
D. Increase speed
Rationale: Calibration ensures measurement accuracy.
Correct Answer: C. Ensure accurate readings
10. Which chemical is commonly used in chlorination of
water?
A. Sodium chloride
B. Calcium carbonate
C. Chlorine gas or sodium hypochlorite
D. Ammonia
EXAM QUESTIONS AND CORRECT ANSWERS
(VERIFIED ANSWERS Q&A 2026 |INSTANT
DOWNLOAD PDF
1. What is the primary purpose of a laboratory analyst in a
water utility?
A. Operate pumping stations
B. Monitor and analyze water quality
C. Repair distribution pipes
D. Collect customer payments
Rationale: Laboratory analysts ensure water safety by testing
physical, chemical, and biological parameters.
Correct Answer: B. Monitor and analyze water quality
2. Which parameter is most commonly used to indicate
microbial contamination in water?
A. pH
B. Turbidity
C. Total coliform bacteria
D. Hardness
,Rationale: Coliform bacteria indicate possible fecal
contamination.
Correct Answer: C. Total coliform bacteria
3. What does pH measure in water?
A. Temperature
B. Acidity or alkalinity
C. Turbidity
D. Dissolved oxygen
Rationale: pH indicates hydrogen ion concentration.
Correct Answer: B. Acidity or alkalinity
4. Which instrument is commonly used to measure turbidity?
A. Spectrophotometer
B. Turbidimeter
C. pH meter
D. Conductivity meter
Rationale: A turbidimeter measures light scattering from
particles.
Correct Answer: B. Turbidimeter
5. What is the acceptable range of pH for drinking water
according to general standards?
,A. 0–4
B. 4–6
C. 6.5–8.5
D. 9–12
Rationale: Safe drinking water is typically near neutral.
Correct Answer: C. 6.5–8.5
6. What does BOD stand for?
A. Biological Oxygen Demand
B. Basic Oxygen Distribution
C. Biochemical Organic Dilution
D. Biological Oxidation Degree
Rationale: BOD measures oxygen used by microorganisms.
Correct Answer: A. Biological Oxygen Demand
7. Why is sample preservation important?
A. To increase color
B. To prevent changes before testing
C. To reduce cost
D. To improve taste
Rationale: Preservation maintains sample integrity.
Correct Answer: B. To prevent changes before testing
, 8. Which gas is most commonly measured in dissolved oxygen
tests?
A. Carbon dioxide
B. Oxygen
C. Nitrogen
D. Hydrogen
Rationale: DO measures oxygen dissolved in water.
Correct Answer: B. Oxygen
9. What is the main purpose of calibration of laboratory
instruments?
A. Clean equipment
B. Improve appearance
C. Ensure accurate readings
D. Increase speed
Rationale: Calibration ensures measurement accuracy.
Correct Answer: C. Ensure accurate readings
10. Which chemical is commonly used in chlorination of
water?
A. Sodium chloride
B. Calcium carbonate
C. Chlorine gas or sodium hypochlorite
D. Ammonia
