Georgia Master Plumber Class II Exam –
Questions And Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A |
Instant Download Pdf
1. What is the minimum slope required for a 2-inch horizontal drain
pipe?
A) 1/8 inch per foot
B) 1/4 inch per foot
C) 1/2 inch per foot
D) 1 inch per foot
B) 1/4 inch per foot
This ensures proper drainage and prevents standing water in
horizontal drain lines.
2. Which type of water heater is typically most energy-efficient?
A) Tankless (on-demand)
B) Storage tank
C) Heat pump
D) Electric resistance
C) Heat pump
Heat pump water heaters use ambient air to heat water,
consuming less energy than conventional tanks.
,3. When testing a newly installed gas line, what is the recommended
test pressure for a low-pressure system?
A) 1 psi
B) 5 psi
C) 10 psi
D) 20 psi
B) 5 psi
Low-pressure gas systems are usually tested at 5 psi to ensure no
leaks without over-pressurizing the piping.
4. What is the primary purpose of a vent stack in plumbing?
A) To remove waste
B) To prevent siphoning of traps
C) To supply water
D) To increase water pressure
B) To prevent siphoning of traps
Vents maintain atmospheric pressure in the drainage system,
preventing trap seals from being lost.
5. What is the maximum distance a water closet can be from its
vent?
A) 3 feet
B) 4 feet
C) 6 feet
D) 10 feet
C) 6 feet
Proper venting ensures adequate airflow to prevent siphoning and
maintain trap seals.
,6. Which material is commonly used for underground water service
piping?
A) PVC
B) PEX
C) Copper
D) Galvanized steel
A) PVC
PVC is corrosion-resistant, cost-effective, and suitable for
underground water service lines.
7. A backflow preventer is required when:
A) Connecting to the municipal supply
B) Installing a water heater
C) Tapping into a well
D) Installing a water softener
A) Connecting to the municipal supply
Backflow preventers protect public water systems from
contamination due to backpressure or backsiphonage.
8. What is the minimum water supply pressure required at a building
for domestic plumbing?
A) 20 psi
B) 30 psi
C) 40 psi
D) 50 psi
B) 30 psi
This ensures fixtures operate properly without excessive strain on
pipes.
, 9. What is the minimum distance between a water heater and a
combustible wall?
A) 6 inches
B) 12 inches
C) 18 inches
D) 24 inches
B) 12 inches
Maintaining clearance prevents fire hazards and allows service
access.
10. Which of the following fittings is used to change the
direction of a pipe?
A) Coupling
B) Elbow
C) Tee
D) Union
B) Elbow
Elbows allow pipe runs to change direction at specified angles,
typically 45° or 90°.
11. What is the standard size for a residential building’s main
water service?
A) 1/2 inch
B) 3/4 inch
C) 1 inch
D) 2 inches
C) 1 inch
Most residential buildings require a 1-inch main to supply
adequate flow for daily usage.
Questions And Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A |
Instant Download Pdf
1. What is the minimum slope required for a 2-inch horizontal drain
pipe?
A) 1/8 inch per foot
B) 1/4 inch per foot
C) 1/2 inch per foot
D) 1 inch per foot
B) 1/4 inch per foot
This ensures proper drainage and prevents standing water in
horizontal drain lines.
2. Which type of water heater is typically most energy-efficient?
A) Tankless (on-demand)
B) Storage tank
C) Heat pump
D) Electric resistance
C) Heat pump
Heat pump water heaters use ambient air to heat water,
consuming less energy than conventional tanks.
,3. When testing a newly installed gas line, what is the recommended
test pressure for a low-pressure system?
A) 1 psi
B) 5 psi
C) 10 psi
D) 20 psi
B) 5 psi
Low-pressure gas systems are usually tested at 5 psi to ensure no
leaks without over-pressurizing the piping.
4. What is the primary purpose of a vent stack in plumbing?
A) To remove waste
B) To prevent siphoning of traps
C) To supply water
D) To increase water pressure
B) To prevent siphoning of traps
Vents maintain atmospheric pressure in the drainage system,
preventing trap seals from being lost.
5. What is the maximum distance a water closet can be from its
vent?
A) 3 feet
B) 4 feet
C) 6 feet
D) 10 feet
C) 6 feet
Proper venting ensures adequate airflow to prevent siphoning and
maintain trap seals.
,6. Which material is commonly used for underground water service
piping?
A) PVC
B) PEX
C) Copper
D) Galvanized steel
A) PVC
PVC is corrosion-resistant, cost-effective, and suitable for
underground water service lines.
7. A backflow preventer is required when:
A) Connecting to the municipal supply
B) Installing a water heater
C) Tapping into a well
D) Installing a water softener
A) Connecting to the municipal supply
Backflow preventers protect public water systems from
contamination due to backpressure or backsiphonage.
8. What is the minimum water supply pressure required at a building
for domestic plumbing?
A) 20 psi
B) 30 psi
C) 40 psi
D) 50 psi
B) 30 psi
This ensures fixtures operate properly without excessive strain on
pipes.
, 9. What is the minimum distance between a water heater and a
combustible wall?
A) 6 inches
B) 12 inches
C) 18 inches
D) 24 inches
B) 12 inches
Maintaining clearance prevents fire hazards and allows service
access.
10. Which of the following fittings is used to change the
direction of a pipe?
A) Coupling
B) Elbow
C) Tee
D) Union
B) Elbow
Elbows allow pipe runs to change direction at specified angles,
typically 45° or 90°.
11. What is the standard size for a residential building’s main
water service?
A) 1/2 inch
B) 3/4 inch
C) 1 inch
D) 2 inches
C) 1 inch
Most residential buildings require a 1-inch main to supply
adequate flow for daily usage.
