ABC WASTEWATER LEVEL 3
CERTIFICATION EXAM
QUESTIONS AND ANSWERS 2026
- 2027
Which one of the following provides a profile of hazardous
substances or mixtures?
A. Occupational Safety and Health Administration (OSHA)
B. Comprehensive Environmental Response, Compensation, and
Liability Act
(CERCLA)
C. Code of Federal Regulations (CFR)
D. material safety data sheet (MSDS) - ANSWERS-D. material safety
data sheet (MSDS)
An atmosphere is defined as oxygen deficient if it contains less than
what percent oxygen by volume?
A. 16.5%
B. 18.5%
C. 19.5%
D. 19.8% - ANSWERS-C. 19.5%
What class of fire involves sodium and magnesium?
,A. Class A
B. Class B
C. Class C
D. Class D - ANSWERS-D. Class D
What is the proper emergency chlorine kit for a 1-ton chlorine
cylinder?
A. emergency kit A
B. emergency kit B
C. emergency kit C
D. emergency kit T - ANSWERS-B. emergency kit B
The specific gravity standard for gases is
A. water vapor at 100°C
B. air
C. oxygen
D. nitrogen - ANSWERS-B. air
The standard for gases has a density of
A. 1.00 g/L
B. 1.13 g/L
C. 1.23 g/L
D. 1.29 g/L - ANSWERS-D. 1.29 g/L
,How many steps are there in coagulation?
A. three steps
B. four steps
C. five steps
D. six steps - ANSWERS-A. three steps
Low-temperature water can be compensated for when using alum by
A. increasing the pH
B. decreasing the pH
C. increasing the alum dosage
D. decreasing the alum dosage - ANSWERS-C. increasing the alum
dosage
When an electrolyte is dissolved in water to form an ion, the ion is
said to be
A. dissociated
B. ionized
C. hydrated
D. hydrolyzed - ANSWERS-A. dissociated
Which one of the following species is ozone?
A. O₂⁺³
B. NO₂
C. O₃
, D. N₂O - ANSWERS-C. O₃
Which laboratory glassware can be used to heat liquids in an open
flame?
A. flasks
B. graduated cylinders
C. volumetric flasks
D. burettes - ANSWERS-A. flasks
When inserting glass tubing into rubber hose or stoppers, never use
_______ for lubrication.
A. oil
B. flame polishing
C. water
D. lubricating jelly - ANSWERS-A. oil
Electrical units operating in areas exposed to flammable vapors
should
A. be removed and reinstalled in a separate room
B. be housed in a tightly sealed container
C. be double-insulated
D. be explosion-proof - ANSWERS-D. be explosion-proof
Usually, what is the percent accuracy of a graduated cylinder ad
burette?
CERTIFICATION EXAM
QUESTIONS AND ANSWERS 2026
- 2027
Which one of the following provides a profile of hazardous
substances or mixtures?
A. Occupational Safety and Health Administration (OSHA)
B. Comprehensive Environmental Response, Compensation, and
Liability Act
(CERCLA)
C. Code of Federal Regulations (CFR)
D. material safety data sheet (MSDS) - ANSWERS-D. material safety
data sheet (MSDS)
An atmosphere is defined as oxygen deficient if it contains less than
what percent oxygen by volume?
A. 16.5%
B. 18.5%
C. 19.5%
D. 19.8% - ANSWERS-C. 19.5%
What class of fire involves sodium and magnesium?
,A. Class A
B. Class B
C. Class C
D. Class D - ANSWERS-D. Class D
What is the proper emergency chlorine kit for a 1-ton chlorine
cylinder?
A. emergency kit A
B. emergency kit B
C. emergency kit C
D. emergency kit T - ANSWERS-B. emergency kit B
The specific gravity standard for gases is
A. water vapor at 100°C
B. air
C. oxygen
D. nitrogen - ANSWERS-B. air
The standard for gases has a density of
A. 1.00 g/L
B. 1.13 g/L
C. 1.23 g/L
D. 1.29 g/L - ANSWERS-D. 1.29 g/L
,How many steps are there in coagulation?
A. three steps
B. four steps
C. five steps
D. six steps - ANSWERS-A. three steps
Low-temperature water can be compensated for when using alum by
A. increasing the pH
B. decreasing the pH
C. increasing the alum dosage
D. decreasing the alum dosage - ANSWERS-C. increasing the alum
dosage
When an electrolyte is dissolved in water to form an ion, the ion is
said to be
A. dissociated
B. ionized
C. hydrated
D. hydrolyzed - ANSWERS-A. dissociated
Which one of the following species is ozone?
A. O₂⁺³
B. NO₂
C. O₃
, D. N₂O - ANSWERS-C. O₃
Which laboratory glassware can be used to heat liquids in an open
flame?
A. flasks
B. graduated cylinders
C. volumetric flasks
D. burettes - ANSWERS-A. flasks
When inserting glass tubing into rubber hose or stoppers, never use
_______ for lubrication.
A. oil
B. flame polishing
C. water
D. lubricating jelly - ANSWERS-A. oil
Electrical units operating in areas exposed to flammable vapors
should
A. be removed and reinstalled in a separate room
B. be housed in a tightly sealed container
C. be double-insulated
D. be explosion-proof - ANSWERS-D. be explosion-proof
Usually, what is the percent accuracy of a graduated cylinder ad
burette?
