PLUMBER’S EXAM | INTERIOR DESIGN PROFESSIONAL EXAM
2026/2027 LATEST UPDATE | QUESTIONS AND VERIFIED ANSWERS
| GRADED A+
A 70' vertical pipe full of water has how much pressure at the base? Math -
CORRECT|ANSWER
30.5 psi
Gray water shall be disinfected by an approved method that employs one or more disinfectants such
as _____. 1 Chlorine 2. Iodine 3. Ozone. IPC 1302 -
CORRECT|ANSWER
All of the above
A plumbing permit becomes invalid if the work authorized by the permit is not started within _____
days from the date of issue, or if the work authorized by the permit is stopped or abandoned after
the work is started for a period of _____ days. IPC 106.5.3 -
CORRECT|ANSWER
180, 180
All horizontal drains within a building shall be provided with cleanouts located not more than _____
feet apart. GA 708.3.1 -
CORRECT|ANSWER
100
The following are acceptable as a cleanout in lieu of the upstream cleanout required to be placed at
the end of a horizontal drain pipe serving _____. 1. "P" traps into which floor drains, shower drains,
or tub drains with removable strainers 2. building drains with a cleanout located near the junction of
the building drain and the building sewer which may be rodded both ways 3. "P" trap into which a
residential washing machine discharges. IPC 708.3.1 -
CORRECT|ANSWER
1, 2, and 3
Plumbing permits are set by_____? IPC 106.6.2 -
CORRECT|ANSWER
,local ordinance
Standpipes shall extend a maximum of _____ inches and a minimum of _____ inches above the trap
IPC 802.4 -
CORRECT|ANSWER
42, 18
Vent stack shall connect at or below the lowest horizontal branch and where the vent stack connects
to the building drain, the connection shall be located downstream of the drainage stack and _____.
IPC 904.4 -
CORRECT|ANSWER
connect within a distance of ten times the diameter of the drainage stack
The maximum distance of 3" trap with a 3" fixture drain shall be from its vent is _____. IPC 909.1 -
CORRECT|ANSWER
12'
A wet vent may serve _____. IPC 912.1 -
CORRECT|ANSWER
A water closet, shower, floor drain, and lavatory located on the same floor level within one
bathroom.
A circuit vent may protect a maximum of _____ fixture traps with their fixture drains connected to a
horizontal branch drain. IPC 914.2 -
CORRECT|ANSWER
8
Combination waste and vent systems shall not receive the discharge from fixtures other than _____.
IPC 915.1 -
CORRECT|ANSWER
floor drains, sinks, lavatories and drinking fountains, food waster grinders, & clinical sinks
Air admittance valves shall be located a minimum of _____ inches above the horizontal branch drain
or fixture drain being vented. IPC 918.4 -
,CORRECT|ANSWER
4
A combination-plumbing fixture is permitted to be installed on one trap provided that one
compartment is not more than _____ inches deeper than the other compartment and the waste
outlets are not more then _____ inches apart. IPC 1002.1 -
CORRECT|ANSWER
6, 30
The size of the vertical conductors and leaders, building storm sewers, and any horizontal branches
of such drains or sewer shall be based on the _____ year hourly rainfall. IPC 1106.1 -
CORRECT|ANSWER
100
Information required on a permit application is established by _____. IPC 10.3 -
CORRECT|ANSWER
Local ordinance
A vent connecting one or more individual vents with a vent stack, stack vent or terminating in the
open air is _____. IPC 202 -
CORRECT|ANSWER
Branch vent
Potable water systems or part thereof shall be subjected and proved tight under a minimum pressure
test of _____? IPC 312.5 -
CORRECT|ANSWER
Working pressure
Air may be used to test a potable water system or part thereof if _____? IPC 312.5 -
CORRECT|ANSWER
The pipes are metallic
, Solders used to make joints in potable water systems shall contain no more than _____ % lead. IPC
605.15.4 -
CORRECT|ANSWER
.2%
Except where a parallel water distribution system manifold with shutoff valves is used, shutoffs for
individual fixtures shall be located _____? IPC 606.2.2 -
CORRECT|ANSWER
on the fixture supply of the fixture
Where water is heated and stored in a closed plumbing system and thermal expansion can occur, a
device shall be installed that would limit the pressure to no more than _____? IPC 607.3.2 -
CORRECT|ANSWER
80 PSI
Who can contract for plumbing work under GA State Law? GA Law -
CORRECT|ANSWER
Master Plumber
A clean out is not required on the upstream end of a horizontal drain line if it serves_____. 1. Water
closet 2. Floor drain, shower drain or tub drain with a removable strainer 3. Trap with clean out plug
or removable trap. GA 708.3.1 -
CORRECT|ANSWER
All of the above
The size of clean outs shall not be less than _____.GA 708.7 -
CORRECT|ANSWER
The size of the pipe they are connected to up to 4"
If a floor drain is installed in a public restroom, the minimum size trap of the floor drain allowed is ?
IPC Table 709.1 -
CORRECT|ANSWER
2"
2026/2027 LATEST UPDATE | QUESTIONS AND VERIFIED ANSWERS
| GRADED A+
A 70' vertical pipe full of water has how much pressure at the base? Math -
CORRECT|ANSWER
30.5 psi
Gray water shall be disinfected by an approved method that employs one or more disinfectants such
as _____. 1 Chlorine 2. Iodine 3. Ozone. IPC 1302 -
CORRECT|ANSWER
All of the above
A plumbing permit becomes invalid if the work authorized by the permit is not started within _____
days from the date of issue, or if the work authorized by the permit is stopped or abandoned after
the work is started for a period of _____ days. IPC 106.5.3 -
CORRECT|ANSWER
180, 180
All horizontal drains within a building shall be provided with cleanouts located not more than _____
feet apart. GA 708.3.1 -
CORRECT|ANSWER
100
The following are acceptable as a cleanout in lieu of the upstream cleanout required to be placed at
the end of a horizontal drain pipe serving _____. 1. "P" traps into which floor drains, shower drains,
or tub drains with removable strainers 2. building drains with a cleanout located near the junction of
the building drain and the building sewer which may be rodded both ways 3. "P" trap into which a
residential washing machine discharges. IPC 708.3.1 -
CORRECT|ANSWER
1, 2, and 3
Plumbing permits are set by_____? IPC 106.6.2 -
CORRECT|ANSWER
,local ordinance
Standpipes shall extend a maximum of _____ inches and a minimum of _____ inches above the trap
IPC 802.4 -
CORRECT|ANSWER
42, 18
Vent stack shall connect at or below the lowest horizontal branch and where the vent stack connects
to the building drain, the connection shall be located downstream of the drainage stack and _____.
IPC 904.4 -
CORRECT|ANSWER
connect within a distance of ten times the diameter of the drainage stack
The maximum distance of 3" trap with a 3" fixture drain shall be from its vent is _____. IPC 909.1 -
CORRECT|ANSWER
12'
A wet vent may serve _____. IPC 912.1 -
CORRECT|ANSWER
A water closet, shower, floor drain, and lavatory located on the same floor level within one
bathroom.
A circuit vent may protect a maximum of _____ fixture traps with their fixture drains connected to a
horizontal branch drain. IPC 914.2 -
CORRECT|ANSWER
8
Combination waste and vent systems shall not receive the discharge from fixtures other than _____.
IPC 915.1 -
CORRECT|ANSWER
floor drains, sinks, lavatories and drinking fountains, food waster grinders, & clinical sinks
Air admittance valves shall be located a minimum of _____ inches above the horizontal branch drain
or fixture drain being vented. IPC 918.4 -
,CORRECT|ANSWER
4
A combination-plumbing fixture is permitted to be installed on one trap provided that one
compartment is not more than _____ inches deeper than the other compartment and the waste
outlets are not more then _____ inches apart. IPC 1002.1 -
CORRECT|ANSWER
6, 30
The size of the vertical conductors and leaders, building storm sewers, and any horizontal branches
of such drains or sewer shall be based on the _____ year hourly rainfall. IPC 1106.1 -
CORRECT|ANSWER
100
Information required on a permit application is established by _____. IPC 10.3 -
CORRECT|ANSWER
Local ordinance
A vent connecting one or more individual vents with a vent stack, stack vent or terminating in the
open air is _____. IPC 202 -
CORRECT|ANSWER
Branch vent
Potable water systems or part thereof shall be subjected and proved tight under a minimum pressure
test of _____? IPC 312.5 -
CORRECT|ANSWER
Working pressure
Air may be used to test a potable water system or part thereof if _____? IPC 312.5 -
CORRECT|ANSWER
The pipes are metallic
, Solders used to make joints in potable water systems shall contain no more than _____ % lead. IPC
605.15.4 -
CORRECT|ANSWER
.2%
Except where a parallel water distribution system manifold with shutoff valves is used, shutoffs for
individual fixtures shall be located _____? IPC 606.2.2 -
CORRECT|ANSWER
on the fixture supply of the fixture
Where water is heated and stored in a closed plumbing system and thermal expansion can occur, a
device shall be installed that would limit the pressure to no more than _____? IPC 607.3.2 -
CORRECT|ANSWER
80 PSI
Who can contract for plumbing work under GA State Law? GA Law -
CORRECT|ANSWER
Master Plumber
A clean out is not required on the upstream end of a horizontal drain line if it serves_____. 1. Water
closet 2. Floor drain, shower drain or tub drain with a removable strainer 3. Trap with clean out plug
or removable trap. GA 708.3.1 -
CORRECT|ANSWER
All of the above
The size of clean outs shall not be less than _____.GA 708.7 -
CORRECT|ANSWER
The size of the pipe they are connected to up to 4"
If a floor drain is installed in a public restroom, the minimum size trap of the floor drain allowed is ?
IPC Table 709.1 -
CORRECT|ANSWER
2"
