Master / Journeyman Plumber Exam
Fixtures Practice Questions
35 practice questions with detailed explanations — aligned to the Master / Journeyman Plumber Exam.
Q1.According to the IPC, the minimum clearance from the center of a water closet to any side wall or partition is:
A.12 inchesB.15 inchesC.18 inchesD.21 inchesB. 15 inchesExplanation: IPC 405.3.1 requires a minimum distance of 15 inches from the centerline of the water closet to any side wall, partition, or vanity.
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Q2.What is the minimum clearance required in front of a water closet, urinal, or lavatory?
A.15 inchesB.18 inchesC.21 inchesD.24 inchesC. 21 inchesExplanation: IPC 405.3.1 requires a clearance of at least 21 inches in front of the water closet, urinal, or lavatory to any wall, fixture, or door.
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Q3.Under the UPC, the minimum clearance in front of a water closet is:
A.18 inchesB.21 inchesC.24 inchesD.30 inchesC. 24 inchesExplanation: UPC 402.5 requires a minimum of 24 inches clear space in front of a water closet. (Note the difference: IPC is 21 inches, UPC is 24 inches).
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Q4.A shower compartment must have a minimum interior cross-sectional area of:
A.600 square inchesB.900 square inchesC.1024 square inchesD.1200 square inchesB. 900 square inchesExplanation: IPC 417.4 requires shower compartments to have at least 900 square inches of interior cross-sectional area.
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Q5.The minimum dimension of a shower compartment is:
A.24 inchesB.30 inchesC.32 inchesD.36 inchesB. 30 inchesExplanation: IPC 417.4 states that a shower compartment shall not be less than 30 inches in minimum dimension.
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Q6.A floor drain must have a removable strainer. The open area of the strainer must be at least:
A.Equal to the cross-sectional area of the drain pipeB.Two-thirds of the drain pipe areaC.One-half of the drain pipe areaD.Twice the area of the drain pipeB. Two-thirds of the drain pipe areaExplanation: IPC 412.1 requires the strainer to have an open area of not less than two-thirds of the cross-sectional area of the drain pipe to ensure adequate flow.
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Q7.Residential dishwashers shall discharge into:
A.A separate trapB.The tailpiece of the kitchen sink or the dishwasher connection of a food waste grinderC.The floor drainD.A vent stackB. The tailpiece of the kitchen sink or the dishwasher connection of a food waste grinderExplanation: IPC 409.2 requires the dishwasher discharge to connect to the sink tailpiece or the disposal inlet, typically through an air break or air gap.
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Q8.Wall-hung water closets shall be supported by:
A.The drainage pipingB.A concealed metal carrierC.The wallboardD.Wood blockingB. A concealed metal carrierExplanation: IPC 405.4.3 requires wall-hung fixtures to be rigidly supported by a metal carrier attached to the building structure, so no strain is transmitted to the piping.
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Q9.When installing a whirlpool tub, the pump access opening must be at least:
A.10 x 10 inchesB.12 x 12 inchesC.18 x 18 inchesD.24 x 24 inchesB. 12 x 12 inchesExplanation: IPC 421.5 requires an access opening of not less than 12 inches by 12 inches (or 18x18 if the pump is more than 2 feet away).
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Q10.The overflow outlet of a fixture must be connected to:
A.The inlet side of the trapB.The outlet side of the trapC.The vent systemD.The floorA. The inlet side of the trapExplanation: IPC 406.1 requires the overflow to discharge into the inlet side of the trap to ensure the overflow water is trapped and does not bypass the seal.
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Q11.According to the UPC, floor drains are required in toilet rooms containing:
A.One water closetB.Two or more water closets or a combination of one water closet and one urinalC.A showerD.Only handicap accessible stallsB. Two or more water closets or a combination of one water closet and one urinalExplanation: UPC 418.3 states floor drains shall be installed in toilet rooms containing two or more water closets or a combination of one water closet and one urinal, except in a dwelling unit.
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Q12.Drinking fountains shall not be installed in:
A.HallwaysB.Public restroomsC.LobbiesD.GymsB. Public restroomsExplanation: IPC 410.2 prohibits drinking fountains in public restrooms.
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Q13.A standard residential lavatory requires a tailpiece diameter of not less than:
A.1 inchB.1-1/4 inchesC.1-1/2 inchesD.2 inchesB. 1-1/4 inchesExplanation: IPC 405.6 requires lavatories to have a waste outlet not less than 1-1/4 inches in diameter.
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Q14.What is the maximum temperature setting for a bidet delivering water to the user?
A.100°FB.110°FC.120°FD.140°FB. 110°FExplanation: IPC 408.3 limits the discharge water temperature from a bidet fitting to 110°F to prevent scalding sensitive areas.
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Q15.Urinals shall not be substituted for more than ___ percent of the required water closets in assembly and educational occupancies.
A.33%B.50%C.67%D.100%C. 67%Explanation: IPC 419.2 states that in each bathroom, urinals shall not be substituted for more than 67 percent of the required water closets.
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Q16.Where two drinking fountains are required, what configuration is mandated?
A.Both at standard heightB.One for standing persons and one for wheelchair users (high-low)C.Both lowD.Separate roomsB. One for standing persons and one for wheelchair users (high-low)Explanation: IPC 410.3 requires that where drinking fountains are provided, 50% must be wheelchair accessible (low) and 50% for standing persons (high).
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Q17.The waste outlet for a bathtub must be at least ___ inches in diameter.
A.1-1/4B.1-1/2C.2D.3B. 1-1/2Explanation: IPC 407.3 requires bathtub waste outlets to be at least 1-1/2 inches.
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Q18.Shower valves must be of the type that provides:
A.Volume control onlyB.Scald protection (pressure balance or thermostatic)C.Digital readoutD.Separate hot and cold handlesB. Scald protection (pressure balance or thermostatic)Explanation: IPC 412.3 requires shower valves to be pressure balancing, thermostatic mixing, or combination type to prevent scalding.
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Q19.What is the maximum flow rate for a private lavatory faucet under current energy conservation standards (and IPC)?
A.1.5 gpmB.2.2 gpmC.2.5 gpmD.3.0 gpmB. 2.2 gpmExplanation: IPC Table 604.4 lists the max flow rate for a private lavatory faucet as 2.2 gpm at 60 psi. (Note: Some green codes or state codes like California are lower, e.g., 1.2 gpm, but 2.2 is the standard IPC value).
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Q20.In a commercial kitchen, a food waste grinder must connect to:
A.A grease interceptorB.A separate trapC.The sanitary drainage system via a trap (bypassing the grease interceptor)D.A floor sinkC. The sanitary drainage system via a trap (bypassing the grease interceptor)Explanation: Food waste grinders generally should NOT discharge into a grease interceptor because the solids fill it up too fast. They connect to the sanitary drain directly (trapped).
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Q21.Joints where fixtures come in contact with walls or floors shall be:
A.Left open for ventilationB.Sealed watertightC.Covered with trimD.PaintedB. Sealed watertightExplanation: IPC 405.5 requires joints between fixtures and walls/floors to be sealed watertight to prevent moisture damage and bacterial growth.
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Q22.Water closet bowls for public use shall be of the:
A.Round front typeB.Elongated typeC.Square typeD.Tank typeB. Elongated typeExplanation: IPC 420.2 requires water closet bowls for public use to be of the elongated type.
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Q23.Automatic clothes washer standpipes shall not be less than ___ inches nor more than ___ inches above the trap weir.
A.12, 24B.18, 30C.18, 42D.24, 36C. 18, 42Explanation: IPC 802.4.3 requires the standpipe to be between 18 inches and 42 inches above the trap weir.
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Q24.The waste outlet of a commercial food waste grinder shall be at least:
A.1-1/2 inchesB.2 inchesC.3 inchesD.4 inchesB. 2 inchesExplanation: IPC Table 405.1 (referenced indirectly via trap size) or Table 709.1 requires a 2-inch drain for commercial food grinders.
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Q25.Emergency showers and eyewash stations shall discharge to:
A.The sanitary drainage systemB.The storm drainage systemC.The groundD.A holding tankA. The sanitary drainage systemExplanation: IPC 411.2 states that emergency showers/eyewashes shall be connected to the sanitary drainage system (though some variances allow indirect waste).
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Q26.Macerating toilet systems shall be installed in accordance with:
A.The manufacturer's instructionsB.The local mayor's opinionC.Standard gravity rulesD.ASTM D2241A. The manufacturer's instructionsExplanation: IPC 412.1 (actually 420 in older, 401.1 general) emphasizes that specialty fixtures like macerating toilets must follow manufacturer instructions.
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Q27.According to IPC Table 709.1, the minimum trap size for a service sink is:
A.1-1/4 inchesB.1-1/2 inchesC.2 inchesD.3 inchesB. 1-1/2 inchesExplanation: IPC Table 709.1 lists a minimum trap size of 1-1/2 inches for a service sink.
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Q28.For a shower liner installation, the liner must turn up on all sides at least ___ inches above the finished threshold level.
A.1B.2C.3D.4B. 2Explanation: IPC 417.5.2 requires the liner to turn up at least 2 inches above the finished threshold level.
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Q29.The effective opening of a faucet is the minimum cross-sectional area at the point of water supply discharge. This determines the:
A.Pipe sizeB.Required air gap distanceC.Fixture unit valueD.Trap sizeB. Required air gap distanceExplanation: The required air gap (usually 2x the effective opening) is calculated based on the diameter of the effective opening.
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Q30.Urinals provided with a flush valve shall discharge not less than ___ gallons per flush (gpf) and not more than ___ gpf.
A.0.5, 1.0B.1.0, 1.6C.Depends on the local water conservation code, but IPC standard is 1.0 gpf maxD.Minimum 1.0 gpfC. Depends on the local water conservation code, but IPC standard is 1.0 gpf maxExplanation: IPC 604.4 lists the maximum flow for a urinal as 1.0 gpf. Newer codes/WaterSense push for 0.5 gpf or 0.125 gpf.
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Q31.Sheet lead liners for showers shall weigh not less than ___ pounds per square foot.
A.2B.3C.4D.5C. 4Explanation: IPC 417.5.2.3 requires sheet lead liners to weigh not less than 4 psf.
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Q32.A fixture tailpiece shall not be more than ___ inches in length from the fixture outlet to the trap weir.
A.12B.18C.24D.30C. 24Explanation: IPC 1002.1 limits the vertical distance to 24 inches.
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Q33.Which of the following materials is approved for a shower pan liner?
A.Chlorinated Polyethylene (CPE) sheetsB.Tar paperC.Standard plastic sheeting (Visqueen)D.DrywallA. Chlorinated Polyethylene (CPE) sheetsExplanation: IPC 417.5.2.1 approves CPE, PVC, and sheet lead for shower liners.
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Q34.The minimum size of the drain for a commercial laundry is typically determined by:
A.The manufacturer's ratingB.Always 2 inchesC.Always 3 inchesD.The number of machinesA. The manufacturer's ratingExplanation: While there are minimums, commercial laundry equipment varies wildly; the code generally refers to manufacturer specs or specific DFU loads for commercial washers (often 3 DFU per machine, requiring appropriate sizing).
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Q35.When installing a bidet, a vacuum breaker must be installed:
A.On the supply sideB.On the drain sideC.Under the floorD.It is not requiredA. On the supply sideExplanation: Because bidets often have submerged sprayers or sprayers below the rim, a vacuum breaker (backflow preventer) is critical on the supply pipe to prevent contamination.
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