PLUMBING EXAM 2 2025/2026 QUESTIONS WITH 100%
CORRECT ANSWERS
True or False: A control valve is required at each water-supplied piece of mechanical equipment. -
True
True or False: Freshwater is naturally occurring water, which is 2.5% of global water such as lakes,
rivers, streams, ground water, and rainwater. - True
True or False: To protect a building water supply system from the effects of thermal expansion in a
closed piping system, an expansion tank should be installed on the cold-water supply side of the
water heater ahead of any circulation line connections. - True
True or False: private water systems serve no more than 60 people. - False
True or False: Thermoelectric power and irrigation remained the two largest uses of water in 2010,
and total withdrawal for both were less than in 2005. - True
True or False: the water supply source is the part of the plumbing system that delivers water to
plumbing fixtures and appliances installed in or outside a building. - False
True or False: A pipe segment is the length of piping from one branch fitting to the next branch fitting
or the fixture branch serving a fixture or appliance outlet. - True
True or False: Gravity circulation is the circulation of water based on the use of a mechanical pump. -
False
True or False: the manufacture of nominal pipe sizes from 1/3" to 12" (3mm to 305mm) is based on
the outside diameter (OD) of the pipe. - False
True or False: Piping should not be directly embedded in concrete. - True
True or False: PVC has a maximum service temperature of 100° F (38.7°C) - False
, True or False: Heating water is estimated to consume 10% to 25% of the total energy used in an
average home. - True
True or False: A check valve is specifically required on the discharge piping from water supply tanks at
or near the tank and at each water service either at the discharge side of a water service meter or at
some point in the unmetered water service. - False
True or False: A plumbing appurtenance is a special class of devices or equipment that is intended to
perform a special plumbing function. - False
True or False: Lavatories are categorized by the building occupant use, their shape, size, and color,
whether they have any special integral features, and by method of installation. - True
True or False: Proper plumbing fixture and appliance installation occurs in two phases: rough-in and
finish. - True
True or False: The wastewater discharged from the bathtub, and other non-sanitary plumbing
fixtures, is identified as black water. - False
True or False: A product that bears the "classified" or "shield" label has demonstrated compliance
with the specific standard or standards to which it was tested. - False
True or False: Siphonage is caused by the effects of self-siphonage and pressure fluctuations,
including aspiration and back pressure. - True
True or False: A trap weir is the depth of water in a fixture that prevents the passage of noxious
odors but allows the free flow of wastewater - False
True or False: A bi-level drinking fountain has separate basins and bubblers installed at two different
levels. - True
True or False: A vanity lavatory is a lavatory in which the basin mounts on top of the countertop. -
False
True or False: Emergency plumping fixtures are categorized by the part of the body the fixture is
intended to provide relief for. - True
CORRECT ANSWERS
True or False: A control valve is required at each water-supplied piece of mechanical equipment. -
True
True or False: Freshwater is naturally occurring water, which is 2.5% of global water such as lakes,
rivers, streams, ground water, and rainwater. - True
True or False: To protect a building water supply system from the effects of thermal expansion in a
closed piping system, an expansion tank should be installed on the cold-water supply side of the
water heater ahead of any circulation line connections. - True
True or False: private water systems serve no more than 60 people. - False
True or False: Thermoelectric power and irrigation remained the two largest uses of water in 2010,
and total withdrawal for both were less than in 2005. - True
True or False: the water supply source is the part of the plumbing system that delivers water to
plumbing fixtures and appliances installed in or outside a building. - False
True or False: A pipe segment is the length of piping from one branch fitting to the next branch fitting
or the fixture branch serving a fixture or appliance outlet. - True
True or False: Gravity circulation is the circulation of water based on the use of a mechanical pump. -
False
True or False: the manufacture of nominal pipe sizes from 1/3" to 12" (3mm to 305mm) is based on
the outside diameter (OD) of the pipe. - False
True or False: Piping should not be directly embedded in concrete. - True
True or False: PVC has a maximum service temperature of 100° F (38.7°C) - False
, True or False: Heating water is estimated to consume 10% to 25% of the total energy used in an
average home. - True
True or False: A check valve is specifically required on the discharge piping from water supply tanks at
or near the tank and at each water service either at the discharge side of a water service meter or at
some point in the unmetered water service. - False
True or False: A plumbing appurtenance is a special class of devices or equipment that is intended to
perform a special plumbing function. - False
True or False: Lavatories are categorized by the building occupant use, their shape, size, and color,
whether they have any special integral features, and by method of installation. - True
True or False: Proper plumbing fixture and appliance installation occurs in two phases: rough-in and
finish. - True
True or False: The wastewater discharged from the bathtub, and other non-sanitary plumbing
fixtures, is identified as black water. - False
True or False: A product that bears the "classified" or "shield" label has demonstrated compliance
with the specific standard or standards to which it was tested. - False
True or False: Siphonage is caused by the effects of self-siphonage and pressure fluctuations,
including aspiration and back pressure. - True
True or False: A trap weir is the depth of water in a fixture that prevents the passage of noxious
odors but allows the free flow of wastewater - False
True or False: A bi-level drinking fountain has separate basins and bubblers installed at two different
levels. - True
True or False: A vanity lavatory is a lavatory in which the basin mounts on top of the countertop. -
False
True or False: Emergency plumping fixtures are categorized by the part of the body the fixture is
intended to provide relief for. - True
