ABC Class 1 Physical/Chemical Operator Exam
(2026/2027) Questions and Verified Answers, 100%
Guarantee Pass
1. How much does a cubic foot of water weigh?
a. 8.34 lbs
b. 7.48 lbs
c. 62.38 lbs
d. 15.82 lbs
2. What is the best way to store a 150# chlorine gas cylinder?
a. On its side
b. Above ground level
c. Upright, secured from falling
d. (missing)
3. Which is not a proper alternative for treatment of industrial wastewater?
a. Pretreatment by the IWTS followed by discharge to the POTW
b. Direct discharge to receiving waters
c. Discharge to POTW for treatment
d. Complete treatment by IWTS and discharge to receiving waters
4. Where should an SCBA be stored for use in a chlorination facility?
a. At the first aid station
b. In the chlorination facility, just inside the door
c. In the employee locker room
d. At the chlorination facility, just outside the door
5. Which is the best method for obtaining representative samples?
a. Time-proportional sampling
b. Flow-proportional sampling
c. Equal volume sampling taken every two hours
d. Grab sampling
6. What information can be obtained from a chain-of-custody?
a. Procedures for testing of wastewater samples
b. List of all people who have come in contact with the samples
c. Sampling requirements of the wastewater permit
d. Evidence log from custody hearing
, 7. What is the purpose of locking out an electrical motor during maintenance?
a. Keep operators out of the electrician's office
b. Keep energy usage down
c. Prevent people from entering the area
d. Prevent the motor from starting
8. What is the volume of a cylindrical tank with an 8 foot diameter and 12 feet tall?
a. 602.8 gallons
b. 6028 gallons
c. 45095 gallons
d. 4510 gallons
9. What is the proper way to align packing rings on a centrifugal pump?
a. Vertically
b. Align the joints
c. Stagger the joints
d. Horizontally
10. What is the purpose of the influent baffle at the entrance of a clarifier?
a. To produce an even flow and prevent short-circuiting
b. To reduce the sludge settling rate
c. To lower the decibel rating of the clarifier
d. To decrease flocculation rates
11. A tank has a liquid level of 18 feet and a diameter of 9 feet. What is the volume of the
liquid?
a. 1144 cu ft
b. 8561 cu ft
c. 127 cu ft
d. 951 cu ft
12. What effect will the addition of alum have on the pH of wastewater?
a. No effect
b. Decrease
c. Increase
d. Slight increase over time
13. What is meant by the influent for a wastewater treatment plant?
a. Incoming flow to the plant
b. Outgoing flow from the plant
c. The relative wealth of plant operators
d. Flow to the secondary treatment system
(2026/2027) Questions and Verified Answers, 100%
Guarantee Pass
1. How much does a cubic foot of water weigh?
a. 8.34 lbs
b. 7.48 lbs
c. 62.38 lbs
d. 15.82 lbs
2. What is the best way to store a 150# chlorine gas cylinder?
a. On its side
b. Above ground level
c. Upright, secured from falling
d. (missing)
3. Which is not a proper alternative for treatment of industrial wastewater?
a. Pretreatment by the IWTS followed by discharge to the POTW
b. Direct discharge to receiving waters
c. Discharge to POTW for treatment
d. Complete treatment by IWTS and discharge to receiving waters
4. Where should an SCBA be stored for use in a chlorination facility?
a. At the first aid station
b. In the chlorination facility, just inside the door
c. In the employee locker room
d. At the chlorination facility, just outside the door
5. Which is the best method for obtaining representative samples?
a. Time-proportional sampling
b. Flow-proportional sampling
c. Equal volume sampling taken every two hours
d. Grab sampling
6. What information can be obtained from a chain-of-custody?
a. Procedures for testing of wastewater samples
b. List of all people who have come in contact with the samples
c. Sampling requirements of the wastewater permit
d. Evidence log from custody hearing
, 7. What is the purpose of locking out an electrical motor during maintenance?
a. Keep operators out of the electrician's office
b. Keep energy usage down
c. Prevent people from entering the area
d. Prevent the motor from starting
8. What is the volume of a cylindrical tank with an 8 foot diameter and 12 feet tall?
a. 602.8 gallons
b. 6028 gallons
c. 45095 gallons
d. 4510 gallons
9. What is the proper way to align packing rings on a centrifugal pump?
a. Vertically
b. Align the joints
c. Stagger the joints
d. Horizontally
10. What is the purpose of the influent baffle at the entrance of a clarifier?
a. To produce an even flow and prevent short-circuiting
b. To reduce the sludge settling rate
c. To lower the decibel rating of the clarifier
d. To decrease flocculation rates
11. A tank has a liquid level of 18 feet and a diameter of 9 feet. What is the volume of the
liquid?
a. 1144 cu ft
b. 8561 cu ft
c. 127 cu ft
d. 951 cu ft
12. What effect will the addition of alum have on the pH of wastewater?
a. No effect
b. Decrease
c. Increase
d. Slight increase over time
13. What is meant by the influent for a wastewater treatment plant?
a. Incoming flow to the plant
b. Outgoing flow from the plant
c. The relative wealth of plant operators
d. Flow to the secondary treatment system
