New Jersey Master Plumber Examination
Questions And Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A | Instant
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1. The New Jersey Uniform Construction Code (UCC) plumbing
subcode is primarily based on which model code?
A. International Plumbing Code (IPC)
B. Uniform Plumbing Code (UPC)
C. National Standard Plumbing Code (NSPC)
D. BOCA Plumbing Code
Answer: C
The New Jersey Plumbing Subcode is based on the NSPC with
state-specific amendments.
2. A New Jersey Master Plumber is legally permitted to do which of
the following?
A. Perform plumbing work only under supervision
B. Design plumbing systems and obtain permits
C. Work only on residential systems
D. Inspect electrical systems
Answer: B
A Master Plumber may design, install, and obtain permits for
plumbing systems.
3. Which state agency oversees plumbing licensure in New Jersey?
A. Department of Labor
, B. Division of Consumer Affairs
C. Department of Community Affairs
D. Board of Public Utilities
Answer: B
Plumbing licenses are regulated by the Division of Consumer
Affairs.
4. Minimum required slope for a 3-inch horizontal drainage pipe is:
A. 1/16 inch per foot
B. 1/8 inch per foot
C. 1/4 inch per foot
D. 1/2 inch per foot
Answer: C
Pipes 3 inches and smaller require a minimum slope of 1/4 inch
per foot.
5. Which material is NOT approved for potable water distribution in
New Jersey?
A. Copper Type L
B. CPVC
C. Galvanized steel
D. ABS
Answer: D
ABS is not approved for potable water distribution.
6. What is the minimum size of a building sewer serving a single-
family dwelling?
A. 2 inches
B. 3 inches
C. 4 inches
, D. 6 inches
Answer: C
A 4-inch building sewer is required for single-family dwellings.
7. The purpose of a plumbing trap is to:
A. Increase flow velocity
B. Prevent backflow
C. Seal sewer gases
D. Reduce pipe corrosion
Answer: C
Traps prevent sewer gases from entering occupied spaces.
8. What is the maximum allowable distance between a trap and its
vent for a 2-inch pipe?
A. 4 feet
B. 5 feet
C. 8 feet
D. 10 feet
Answer: C
NSPC allows up to 8 feet for a 2-inch trap arm.
9. Which fitting is required at the base of a vertical soil stack?
A. Sanitary tee
B. Long sweep
C. Combination wye and 1/8 bend
D. Short sweep elbow
Answer: C
This fitting provides smooth transition and reduces blockage risk.
10. A relief vent is primarily used to:
A. Increase drainage speed
Questions And Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A | Instant
Download Pdf
1. The New Jersey Uniform Construction Code (UCC) plumbing
subcode is primarily based on which model code?
A. International Plumbing Code (IPC)
B. Uniform Plumbing Code (UPC)
C. National Standard Plumbing Code (NSPC)
D. BOCA Plumbing Code
Answer: C
The New Jersey Plumbing Subcode is based on the NSPC with
state-specific amendments.
2. A New Jersey Master Plumber is legally permitted to do which of
the following?
A. Perform plumbing work only under supervision
B. Design plumbing systems and obtain permits
C. Work only on residential systems
D. Inspect electrical systems
Answer: B
A Master Plumber may design, install, and obtain permits for
plumbing systems.
3. Which state agency oversees plumbing licensure in New Jersey?
A. Department of Labor
, B. Division of Consumer Affairs
C. Department of Community Affairs
D. Board of Public Utilities
Answer: B
Plumbing licenses are regulated by the Division of Consumer
Affairs.
4. Minimum required slope for a 3-inch horizontal drainage pipe is:
A. 1/16 inch per foot
B. 1/8 inch per foot
C. 1/4 inch per foot
D. 1/2 inch per foot
Answer: C
Pipes 3 inches and smaller require a minimum slope of 1/4 inch
per foot.
5. Which material is NOT approved for potable water distribution in
New Jersey?
A. Copper Type L
B. CPVC
C. Galvanized steel
D. ABS
Answer: D
ABS is not approved for potable water distribution.
6. What is the minimum size of a building sewer serving a single-
family dwelling?
A. 2 inches
B. 3 inches
C. 4 inches
, D. 6 inches
Answer: C
A 4-inch building sewer is required for single-family dwellings.
7. The purpose of a plumbing trap is to:
A. Increase flow velocity
B. Prevent backflow
C. Seal sewer gases
D. Reduce pipe corrosion
Answer: C
Traps prevent sewer gases from entering occupied spaces.
8. What is the maximum allowable distance between a trap and its
vent for a 2-inch pipe?
A. 4 feet
B. 5 feet
C. 8 feet
D. 10 feet
Answer: C
NSPC allows up to 8 feet for a 2-inch trap arm.
9. Which fitting is required at the base of a vertical soil stack?
A. Sanitary tee
B. Long sweep
C. Combination wye and 1/8 bend
D. Short sweep elbow
Answer: C
This fitting provides smooth transition and reduces blockage risk.
10. A relief vent is primarily used to:
A. Increase drainage speed
