MASTER PLUMBING WSSC COMPETENCY
REVIEW 2026 MOCK TEST COMPLETE KEY
INSIGHTS
◉ ALLEY.
Answer: ANY PUBLIC SPACE, PUBLIC PARK, OR THIRIUGHFARE
LESS THAN 3 METERS BUT NOT LESS THAN 2 METERS IN WIDTH
DEDICATED OR DEEDED FOR PUBLIC USE
◉ ALTER or ALTERATION.
Answer: ANY CHANGE, ADDITION OR MODIFICATION IN
CONSTRUCTION OR OCCUPANCY
◉ ACCESSIBLE.
Answer: WHEN APPLIED TO A FIXTURE, CONNECTION, APPLIANCE
OR EQUIPMENT, SHALL MEAN HAVING ACCESS THERETO, BUT
WHICH MAY REQUIRE PRIOR REMOVAL OF AN ACCESS PANEL,
DOOR OR SIMILAR OBSTRUCTION. "READILY ACCESSIBLE" SHALL
MEAN DIRECT ACCESS WITHOUT THE NECESSITY OF REMOVING
ANY PANEL, DOOR OR SIMILAR OBSTRUCTION.
◉ AIRBREAK.
,Answer: A PHYSICAL SEPARATION, WHICH MAY BE A LOW INLET
INTO THE INDRECT WASTE RECEPTOR FROM THE FIXTURE
APPLIANCE OR DEVICE INDRECTLY CONNECTED.
◉ AIR GAP, DRAINAGE.
Answer: THE UNOBSTRUCTED VERTICAL DISTANCE THROUGH THE
FREE ATMOSHPHERE BETWEEN THE LOWEST OPENING FROM
ANY PIPE, PLUMBING FIXTURE, APPLIANCE OR APPURTENANCE
CONVEYING WASTE TO THE FLOOD LEVEL RIM OF THE RECEPTOR.
◉ AIR GAP, WATER DISTRIBUTION.
Answer: AN UNOBSTRUCTED VERTICAL DISTANCE THROUGH THE
FREE ATMOSPHERE BETWEEN THE LOWEST OPENING FROM ANY
PIPE OR FAUCET CONVEYING POTABLE WATE TO THE FLOOD-
LEVEL RIM OF ANY TANK, VAT OR FIXTURE.
◉ APPROVED.
Answer: ACCEPTED OR ACCEPTABLE UNDER AN APPLICABLE
SPECIFICATIONS OR STANDARD STATED OR CITED IN THIS CODE,
OR ACCEPTED AS SUITABLE FOR ANY PROPOSED USE UNDER
PROCEDURES AND POWERS OF THE ADMINISTRATIVE
AUTHORITY.
◉ APPROVED TESTING AGENCY.
,Answer: AN ORGANIZTION PRIMARILY ESTABLISHED FOR
PURPOSES OF TESTING TO APPROVED STANDARDS AND
APPROVED BY THE ADMINISTRATIVE AUTHORITY.
◉ ADMINISTRATIVE AUTHORITY.
Answer: THE ADMINISTRATIVE AUTHORITY INCLUDING THE
BUILDING OFFICIAL, THE COMMISSION, THE BOARD AND SUCH
OTHER DEPARTMENT OR AGENCY ESTABLISHED AND
AUTHORIZED TO ADMINISTER AND ENFORCE THE PROVISIONS
◉ BACKFLOW.
Answer: THE FLOW OF WATER OR OTHER LIQUIDS, MIXTURES OR
SUBSTANCES INTO THE DISTRIBUTING PIPES OF A POTABLE
SUPPLY OF WATER FROM ANY SOURCE OTHER THAN FROM ITS
INTENDED SOURCE
◉ BACKFLOW CONNECTION.
Answer: CONDITION OR ANY ARRANGEMENT WHEREBY REVERSE
FLOW CAN OCCUR
◉ BACKPRESSURE BACKFLOW.
Answer: OCCURS DUE TO AN INCREASED REVERSE PRESSURE
ABOVE THE SUPPLY PRESSURE. THIS MAY BE DUE TO PUMPS,
BOILERS, GRAVITY OR OTHER SOURCES OF PRESSURE.
, ◉ BACKFLOW PREVENTER.
Answer: DEVICE OR MEANS TO PREVENT FLOW OF LIQUID FROM
RETURNING TO THE SOURCE OF SUPPLY. ALSO CALLED VACUUM
BREAKER.
◉ BACK-SIPHONAGE.
Answer: THE FLOWING BACK OF USED, CONTAMINATED OR
POLLUTED WATER FROM A PLUMBING FIXTURE OR VESSEL INTO A
WATER SUPPLY PIPE DUE TO A NEGATIVE PRESSURE IN SUCH PIPE
◉ BACKWATER VALVE.
Answer: A DEVICE INSTALLED IN A DRAINAGE SYSTEM TO
PREVENT REVERSE FLOW
◉ BACKVENT PIPE.
Answer: THE PART OF A VENT LINE, WHICH CONNECTS DIRECTLY
WITH AN INDIVIDUAL TRAP UNDERNEATH OR BEHIND THE
FIXTURE AND EXTENDS TO THE BRANCH OR MAIN VENT PIPE AT
ANY POINT HIGHER THAN THE FIXTURE OR FIXTURE TRAPS IT
SERVES. THIS IS SOMETIMES CALLED AN INDIVIDUAL VENT
◉ BALL COCK.
Answer: A VALVED OPENED AND CLOSED BY THE FALL AND RISE
RESPECTIVELY OF AN ATTACHED BALL FLOATING ON THE
SURFACE OF THE LIQUID
REVIEW 2026 MOCK TEST COMPLETE KEY
INSIGHTS
◉ ALLEY.
Answer: ANY PUBLIC SPACE, PUBLIC PARK, OR THIRIUGHFARE
LESS THAN 3 METERS BUT NOT LESS THAN 2 METERS IN WIDTH
DEDICATED OR DEEDED FOR PUBLIC USE
◉ ALTER or ALTERATION.
Answer: ANY CHANGE, ADDITION OR MODIFICATION IN
CONSTRUCTION OR OCCUPANCY
◉ ACCESSIBLE.
Answer: WHEN APPLIED TO A FIXTURE, CONNECTION, APPLIANCE
OR EQUIPMENT, SHALL MEAN HAVING ACCESS THERETO, BUT
WHICH MAY REQUIRE PRIOR REMOVAL OF AN ACCESS PANEL,
DOOR OR SIMILAR OBSTRUCTION. "READILY ACCESSIBLE" SHALL
MEAN DIRECT ACCESS WITHOUT THE NECESSITY OF REMOVING
ANY PANEL, DOOR OR SIMILAR OBSTRUCTION.
◉ AIRBREAK.
,Answer: A PHYSICAL SEPARATION, WHICH MAY BE A LOW INLET
INTO THE INDRECT WASTE RECEPTOR FROM THE FIXTURE
APPLIANCE OR DEVICE INDRECTLY CONNECTED.
◉ AIR GAP, DRAINAGE.
Answer: THE UNOBSTRUCTED VERTICAL DISTANCE THROUGH THE
FREE ATMOSHPHERE BETWEEN THE LOWEST OPENING FROM
ANY PIPE, PLUMBING FIXTURE, APPLIANCE OR APPURTENANCE
CONVEYING WASTE TO THE FLOOD LEVEL RIM OF THE RECEPTOR.
◉ AIR GAP, WATER DISTRIBUTION.
Answer: AN UNOBSTRUCTED VERTICAL DISTANCE THROUGH THE
FREE ATMOSPHERE BETWEEN THE LOWEST OPENING FROM ANY
PIPE OR FAUCET CONVEYING POTABLE WATE TO THE FLOOD-
LEVEL RIM OF ANY TANK, VAT OR FIXTURE.
◉ APPROVED.
Answer: ACCEPTED OR ACCEPTABLE UNDER AN APPLICABLE
SPECIFICATIONS OR STANDARD STATED OR CITED IN THIS CODE,
OR ACCEPTED AS SUITABLE FOR ANY PROPOSED USE UNDER
PROCEDURES AND POWERS OF THE ADMINISTRATIVE
AUTHORITY.
◉ APPROVED TESTING AGENCY.
,Answer: AN ORGANIZTION PRIMARILY ESTABLISHED FOR
PURPOSES OF TESTING TO APPROVED STANDARDS AND
APPROVED BY THE ADMINISTRATIVE AUTHORITY.
◉ ADMINISTRATIVE AUTHORITY.
Answer: THE ADMINISTRATIVE AUTHORITY INCLUDING THE
BUILDING OFFICIAL, THE COMMISSION, THE BOARD AND SUCH
OTHER DEPARTMENT OR AGENCY ESTABLISHED AND
AUTHORIZED TO ADMINISTER AND ENFORCE THE PROVISIONS
◉ BACKFLOW.
Answer: THE FLOW OF WATER OR OTHER LIQUIDS, MIXTURES OR
SUBSTANCES INTO THE DISTRIBUTING PIPES OF A POTABLE
SUPPLY OF WATER FROM ANY SOURCE OTHER THAN FROM ITS
INTENDED SOURCE
◉ BACKFLOW CONNECTION.
Answer: CONDITION OR ANY ARRANGEMENT WHEREBY REVERSE
FLOW CAN OCCUR
◉ BACKPRESSURE BACKFLOW.
Answer: OCCURS DUE TO AN INCREASED REVERSE PRESSURE
ABOVE THE SUPPLY PRESSURE. THIS MAY BE DUE TO PUMPS,
BOILERS, GRAVITY OR OTHER SOURCES OF PRESSURE.
, ◉ BACKFLOW PREVENTER.
Answer: DEVICE OR MEANS TO PREVENT FLOW OF LIQUID FROM
RETURNING TO THE SOURCE OF SUPPLY. ALSO CALLED VACUUM
BREAKER.
◉ BACK-SIPHONAGE.
Answer: THE FLOWING BACK OF USED, CONTAMINATED OR
POLLUTED WATER FROM A PLUMBING FIXTURE OR VESSEL INTO A
WATER SUPPLY PIPE DUE TO A NEGATIVE PRESSURE IN SUCH PIPE
◉ BACKWATER VALVE.
Answer: A DEVICE INSTALLED IN A DRAINAGE SYSTEM TO
PREVENT REVERSE FLOW
◉ BACKVENT PIPE.
Answer: THE PART OF A VENT LINE, WHICH CONNECTS DIRECTLY
WITH AN INDIVIDUAL TRAP UNDERNEATH OR BEHIND THE
FIXTURE AND EXTENDS TO THE BRANCH OR MAIN VENT PIPE AT
ANY POINT HIGHER THAN THE FIXTURE OR FIXTURE TRAPS IT
SERVES. THIS IS SOMETIMES CALLED AN INDIVIDUAL VENT
◉ BALL COCK.
Answer: A VALVED OPENED AND CLOSED BY THE FALL AND RISE
RESPECTIVELY OF AN ATTACHED BALL FLOATING ON THE
SURFACE OF THE LIQUID
