system?
A) A network of pipes delivering water and removing waste
B) A series of electrical circuits
C) A ventilation system for air circulation
D) A system for gas distribution only
Answer: A
Explanation: A residential plumbing system involves the distribution
of water for various uses and removal of waste through pipes.
Q2: What is the primary purpose of drainage systems in a home?
A) To provide hot water
B) To remove wastewater safely
C) To support gas lines
D) To filter drinking water
Answer: B
Explanation: Drainage systems are designed to safely remove
wastewater from a building.
Q3: Which material is commonly used for water supply pipes due to
its durability and ease of installation?
A) Galvanized steel
B) PVC
C) PEX
D) Cast iron
Answer: C
Explanation: PEX is widely used for residential water supply due to its
flexibility and ease of installation.
Q4: Plumbing codes are important because they ensure:
A) Aesthetic appeal of installations
B) Safety and proper functioning of plumbing systems
,C) Lower water bills
D) Increased water pressure
Answer: B
Explanation: Codes ensure that plumbing systems are safe and
function properly.
Q5: What component is responsible for controlling water flow in a
plumbing system?
A) Faucet
B) Valve
C) Water meter
D) Trap
Answer: B
Explanation: Valves regulate water flow within a plumbing system.
Q6: Which fixture is typically not part of the water supply system?
A) Sink
B) Toilet
C) Dishwasher
D) Air conditioner
Answer: D
Explanation: Air conditioners are not part of the water supply system;
they are separate appliances.
Q7: Copper pipes are traditionally used because they:
A) Are flexible
B) Resist corrosion and have long lifespans
C) Are the cheapest option
D) Are immune to scaling
Answer: B
Explanation: Copper is known for its resistance to corrosion and
durability.
,Q8: PVC is most commonly used for:
A) Hot water supply
B) Cold water drainage and waste systems
C) Gas lines
D) Water filtration
Answer: B
Explanation: PVC is primarily used for drainage and waste systems
due to its chemical resistance.
Q9: What does PEX stand for in plumbing?
A) Polyethylene extruded
B) Polyethylene cross-linked
C) Polyethylene expanded
D) Polyethylene extended
Answer: B
Explanation: PEX stands for cross-linked polyethylene, used for
flexible piping.
Q10: Which of the following is not a typical plumbing fixture?
A) Bathtub
B) Refrigerator
C) Shower
D) Toilet
Answer: B
Explanation: Refrigerators are appliances, not fixtures, though some
have water connections.
Q11: Plumbing systems must adhere to which type of regulations?
A) Traffic codes
B) Building codes
C) Agricultural standards
D) Automotive standards
, Answer: B
Explanation: Plumbing systems are regulated by building codes to
ensure safety and compliance.
Q12: Which component is crucial for preventing sewer gases from
entering a building?
A) Faucet
B) Trap
C) Valve
D) Pipe hanger
Answer: B
Explanation: A trap holds water to block sewer gases from coming
back into the building.
Q13: What is the main advantage of using galvanized steel pipes in
older homes?
A) They are flexible
B) They are inexpensive
C) They have a long lifespan
D) They provide high water pressure
Answer: C
Explanation: Galvanized steel pipes were historically used for
durability, though they may corrode over time.
Q14: What is an important consideration when selecting pipe material
for a specific application?
A) Color
B) Cost and durability
C) Size of the building only
D) Personal preference
Answer: B