MASTER PLUMBING WSSC EXAM 2026 UPDATE QUESTIONS
AND CORRECT VERIFIED ANSWERS ALREADY GRADED A+
(BRAND NEW VISION)
Waste water discharged into the building drainage system shall not be over _______ *F - ANS-
140
A water tank holds 50 gallons of water. How much does the 50 gallons of water weigh? - ANS-
417 lbs
Exterior walls may be notched to a depth exceeding _______________ percent of its width. -
ANS-25
According to the WSSC PFGC, a full flow building water service valve shall be installed within
_____ feet of where the water service enters the building. - ANS-3'
According to the WSSC PFGC, water meters installed inside of buildings shall be located in an
area capable of maintaining _____ *F. - ANS-50
In Prince George and Montgomery County, water service piping shall be not less than _____
inches below grade. - ANS-30
A cylindrical tank is 22 inches in diameter and 5 feet tall. How many gallons of water will it hold?
- ANS-98
The best method of backflow protection is an? - ANS-Air-gap
, Horizontal drainage piping 4 inches in diameter shall have a minimum slope of _____ per foot. -
ANS-1/8
Water hammer arrestors shall conform to ASSE _______ - ANS-1010
A connection between a vent pipe and a vent stack or stack vent shall be at least _____ inches
above the flood level rim of the highest fixture served by the vent. - ANS-6 inches
Air admittance valves shall be installed a minimum of ______ inches above insulation materials.
- ANS-6
A water supply system test done with air shall be at not less than ____ PSI. - ANS-50
If you install 80 feet of sewer at 1/4" per foot how many inches of fall in the run? - ANS-20
The minimum size water supply pipe to a bidet shall be _____ inch. - ANS-3/8
Horizontal drains shall have cleanouts not more than ______ feet apart. - ANS-100
Standpipes shall extend a maximum of ____ inches above the trap weir. - ANS-42
Shower compartments shall not be less than _____ inches in minimum dimension. - ANS-30
Shower liners shall be sloped at _____ towards the drain. - ANS-2.0%
A water closet shall have not less than ____ inches from its centerline to any side wall. - ANS-
15"
AND CORRECT VERIFIED ANSWERS ALREADY GRADED A+
(BRAND NEW VISION)
Waste water discharged into the building drainage system shall not be over _______ *F - ANS-
140
A water tank holds 50 gallons of water. How much does the 50 gallons of water weigh? - ANS-
417 lbs
Exterior walls may be notched to a depth exceeding _______________ percent of its width. -
ANS-25
According to the WSSC PFGC, a full flow building water service valve shall be installed within
_____ feet of where the water service enters the building. - ANS-3'
According to the WSSC PFGC, water meters installed inside of buildings shall be located in an
area capable of maintaining _____ *F. - ANS-50
In Prince George and Montgomery County, water service piping shall be not less than _____
inches below grade. - ANS-30
A cylindrical tank is 22 inches in diameter and 5 feet tall. How many gallons of water will it hold?
- ANS-98
The best method of backflow protection is an? - ANS-Air-gap
, Horizontal drainage piping 4 inches in diameter shall have a minimum slope of _____ per foot. -
ANS-1/8
Water hammer arrestors shall conform to ASSE _______ - ANS-1010
A connection between a vent pipe and a vent stack or stack vent shall be at least _____ inches
above the flood level rim of the highest fixture served by the vent. - ANS-6 inches
Air admittance valves shall be installed a minimum of ______ inches above insulation materials.
- ANS-6
A water supply system test done with air shall be at not less than ____ PSI. - ANS-50
If you install 80 feet of sewer at 1/4" per foot how many inches of fall in the run? - ANS-20
The minimum size water supply pipe to a bidet shall be _____ inch. - ANS-3/8
Horizontal drains shall have cleanouts not more than ______ feet apart. - ANS-100
Standpipes shall extend a maximum of ____ inches above the trap weir. - ANS-42
Shower compartments shall not be less than _____ inches in minimum dimension. - ANS-30
Shower liners shall be sloped at _____ towards the drain. - ANS-2.0%
A water closet shall have not less than ____ inches from its centerline to any side wall. - ANS-
15"
