PLUMBING EXAM WITH CORRECT ANSWERS-UPDATED (2025-
2026)
A journeyman plumber and an apprentice, who are employed by a master plumber, are
installing the DWV-system and water distribution system in a 2-½ story single family
dwelling. QUESTION: What answer below shall be considered most correct to complete
the following "Plumbing code knowledge" related statement: A trap that serves a single
shower stall that is equipped with a hand shower, a rain head, and a standard shower head
shall be no less than ________ in minimum diameter
A) 1-½" B) 2" C) 2-½" D) 3"
Correct answer: 2 inches
A journeyman plumber and apprentice are installing 3-inch oor drains in an open-parking-
garage that is subject to freezing temperatures. QUESTION: What answer below shall be
considered most correct to complete the following "Plumbing code knowledge" related
statement: The installation of traps at the oor drain locations which are found susceptible
to freezing temperatures may be __________.
A)Increased to 4-inch B) Eliminated C) Wrapped with freeze protection cable D) Insulated
Correct answer: eliminated
A journeyman plumber and apprentice are installing lab sinks with faucets that are
connected to an acid waste system for-(special hazardous waste) in a medical lab. What
answer below shall be considered most correct to complete the following "Plumbing code
knowledge" related statement: Vacuum breakers shall be installed with the critical level at
least _____-inches above the ood level rim of the xture they serve and on the discharge
side of the last control valve to the xture.
A) 12 B) 6 C) 18 D) 3
,Correct answer: 6 inches
What answer below shall be considered most correct to complete the following "Plumbing
code knowledge" related statement: No plumbing permit shall be issued for cross
connection installations that require ______________ until the application for a permit is
accompanied by a letter of approval from the Massachusetts Department of Environmental
Protection or its designee.
A) RPBP B) A "critical level" height C) Atmospheric vacuum breakers D) Water recycling
systems
Correct answer: reduced pressure backow preventer (RPBP)
: What answer below shall be considered most correct to complete the following "Plumbing
code knowledge" related statement: The waste discharge from safe waste pans serving
water heaters or hot water storage tanks where there is _______ below and shall be piped
indirectly to a properly trapped and vented xture.
A) People B) Occupancy C) Floors D) Plumbing connections
Correct answer: occupancy
GIVEN: A journeyman plumber and an apprentice, (who are employed by a master
plumber), are installing the sanitary DWV and water distribution system in a ve-story
residential condominium complex. QUESTION: What answer below shall be considered
most correct to complete the following "Plumbing code knowledge" related statement:
CPVC-(Chlorinated Polyvinyl Chloride) pipe and ttings may be used provided that none of
this material is located within ____-inches of any connection to a hot water tank as dened
in MGL. c. 142, § 17
A) 12 B) 18 C) 20 D) 24 E) 30
Correct answer: 24 inches
,: A journeyman plumber and apprentice are roughing-in multiple xtures in a new tness
center. The facility will include a juice bar, temporary daycare room, men's and women's
toilet facilities and men's and women's locker rooms. QUESTION: What answer below shall
be considered most correct to complete the following "Plumbing code knowledge" related
statement: A ________-vent is a branch vent that serves two or more oor-outlet xtures
that are battery wasted. The vent extends from the top of the horizontal soil and/or waste
branch in front of the last xture waste and connects to a vent stack or stack vent that is
adjacent to the down-stream end of the horizontal branch.
A) Side B) Loop C) Relief D) Circuit
Correct answer: loop
MATCH:
Elevated pressure
Flow designation
Ten P.S.I.G. or less
Less than 2-P.S.I
A) 3 P.S.I.G. or ten times
B) Inlet pressure
C) E.H.D.
D) Prof. Engineer
Correct answer: elevated pressure- d
ow designation-c
Ten P.S.I.G. or less-a
Less than 2-P.S.I-b
, N: A journeyman plumber is installing category-I gas appliances and equipment in the
basement of a building. A 120,000 BTU/hr. boiler and 40,000 BTU/hr. water heater are being
installed. QUESTION: What answer below shall be considered most correct to complete
the following "Gas code knowledge" related statement: The boiler requires a minimum of
_____-cu. ft. of air to support proper combustion
A) 2,400 cu. ft. B) 120 sq. in. C) 3,200 sq. ft. D) 800 cu. ft.
Correct answer: 2,400 cu. ft. 120,000/50
) QUESTION: What answer below shall be considered most correct to complete the
following "Gas code knowledge" related statement: The code would require the gas vent
penetrating the roof in-[FIGURE-TP-B-Q1-1A: GAS VENT SIZING] as identied at point-[A] to
be not less than ______ above any portion of a building within 10-feet horizontally.
A) 24" B) 3-feet C) 30-inches D) Forty-two-inches
Correct answer: 24
In Massachusetts copper tubing and ttings may be used for natural gas piping
A) Provided that the tubing is type-k with ared tting connections. B) When approved by
the authority having jurisdiction.
C) At interior locations only and not concealed.
D) If the gas contains no more than .03 grains of hydrogen sulde per 100 cu. ft. of gas.
Correct answer: If the gas contains no more than .03 grains of hydrogen sulde per 100 cu.
ft. of gas
: A journeyman plumber and apprentice, who are employed by a master plumber, are
installing a natural gas red category-1 boiler and water heater to an interior, clay tile lined,
masonry chimney. When measured in compliance with the code the chimney "height" is
48-feet. QUESTION: What answer below shall be considered most correct to complete the
2026)
A journeyman plumber and an apprentice, who are employed by a master plumber, are
installing the DWV-system and water distribution system in a 2-½ story single family
dwelling. QUESTION: What answer below shall be considered most correct to complete
the following "Plumbing code knowledge" related statement: A trap that serves a single
shower stall that is equipped with a hand shower, a rain head, and a standard shower head
shall be no less than ________ in minimum diameter
A) 1-½" B) 2" C) 2-½" D) 3"
Correct answer: 2 inches
A journeyman plumber and apprentice are installing 3-inch oor drains in an open-parking-
garage that is subject to freezing temperatures. QUESTION: What answer below shall be
considered most correct to complete the following "Plumbing code knowledge" related
statement: The installation of traps at the oor drain locations which are found susceptible
to freezing temperatures may be __________.
A)Increased to 4-inch B) Eliminated C) Wrapped with freeze protection cable D) Insulated
Correct answer: eliminated
A journeyman plumber and apprentice are installing lab sinks with faucets that are
connected to an acid waste system for-(special hazardous waste) in a medical lab. What
answer below shall be considered most correct to complete the following "Plumbing code
knowledge" related statement: Vacuum breakers shall be installed with the critical level at
least _____-inches above the ood level rim of the xture they serve and on the discharge
side of the last control valve to the xture.
A) 12 B) 6 C) 18 D) 3
,Correct answer: 6 inches
What answer below shall be considered most correct to complete the following "Plumbing
code knowledge" related statement: No plumbing permit shall be issued for cross
connection installations that require ______________ until the application for a permit is
accompanied by a letter of approval from the Massachusetts Department of Environmental
Protection or its designee.
A) RPBP B) A "critical level" height C) Atmospheric vacuum breakers D) Water recycling
systems
Correct answer: reduced pressure backow preventer (RPBP)
: What answer below shall be considered most correct to complete the following "Plumbing
code knowledge" related statement: The waste discharge from safe waste pans serving
water heaters or hot water storage tanks where there is _______ below and shall be piped
indirectly to a properly trapped and vented xture.
A) People B) Occupancy C) Floors D) Plumbing connections
Correct answer: occupancy
GIVEN: A journeyman plumber and an apprentice, (who are employed by a master
plumber), are installing the sanitary DWV and water distribution system in a ve-story
residential condominium complex. QUESTION: What answer below shall be considered
most correct to complete the following "Plumbing code knowledge" related statement:
CPVC-(Chlorinated Polyvinyl Chloride) pipe and ttings may be used provided that none of
this material is located within ____-inches of any connection to a hot water tank as dened
in MGL. c. 142, § 17
A) 12 B) 18 C) 20 D) 24 E) 30
Correct answer: 24 inches
,: A journeyman plumber and apprentice are roughing-in multiple xtures in a new tness
center. The facility will include a juice bar, temporary daycare room, men's and women's
toilet facilities and men's and women's locker rooms. QUESTION: What answer below shall
be considered most correct to complete the following "Plumbing code knowledge" related
statement: A ________-vent is a branch vent that serves two or more oor-outlet xtures
that are battery wasted. The vent extends from the top of the horizontal soil and/or waste
branch in front of the last xture waste and connects to a vent stack or stack vent that is
adjacent to the down-stream end of the horizontal branch.
A) Side B) Loop C) Relief D) Circuit
Correct answer: loop
MATCH:
Elevated pressure
Flow designation
Ten P.S.I.G. or less
Less than 2-P.S.I
A) 3 P.S.I.G. or ten times
B) Inlet pressure
C) E.H.D.
D) Prof. Engineer
Correct answer: elevated pressure- d
ow designation-c
Ten P.S.I.G. or less-a
Less than 2-P.S.I-b
, N: A journeyman plumber is installing category-I gas appliances and equipment in the
basement of a building. A 120,000 BTU/hr. boiler and 40,000 BTU/hr. water heater are being
installed. QUESTION: What answer below shall be considered most correct to complete
the following "Gas code knowledge" related statement: The boiler requires a minimum of
_____-cu. ft. of air to support proper combustion
A) 2,400 cu. ft. B) 120 sq. in. C) 3,200 sq. ft. D) 800 cu. ft.
Correct answer: 2,400 cu. ft. 120,000/50
) QUESTION: What answer below shall be considered most correct to complete the
following "Gas code knowledge" related statement: The code would require the gas vent
penetrating the roof in-[FIGURE-TP-B-Q1-1A: GAS VENT SIZING] as identied at point-[A] to
be not less than ______ above any portion of a building within 10-feet horizontally.
A) 24" B) 3-feet C) 30-inches D) Forty-two-inches
Correct answer: 24
In Massachusetts copper tubing and ttings may be used for natural gas piping
A) Provided that the tubing is type-k with ared tting connections. B) When approved by
the authority having jurisdiction.
C) At interior locations only and not concealed.
D) If the gas contains no more than .03 grains of hydrogen sulde per 100 cu. ft. of gas.
Correct answer: If the gas contains no more than .03 grains of hydrogen sulde per 100 cu.
ft. of gas
: A journeyman plumber and apprentice, who are employed by a master plumber, are
installing a natural gas red category-1 boiler and water heater to an interior, clay tile lined,
masonry chimney. When measured in compliance with the code the chimney "height" is
48-feet. QUESTION: What answer below shall be considered most correct to complete the
