BLOCK 1 PLUMBING EXAM QUESTIONS AND
CORRECT ANSWERS (VERIFIED ANSWERS) Q7A
2027 |INSTANT DOWNLOAD PDF
1. What is the primary purpose of a plumbing system in a
building?
A. To provide electrical power
B. To supply potable water and remove wastewater
C. To control indoor temperature
D. To provide structural support
Answer: B. To supply potable water and remove wastewater
Rationale: Plumbing systems distribute water for use and safely
convey wastewater away from the building.
2. Which material is commonly used for potable water piping?
A. PVC
B. Copper
C. Cast iron only
D. Concrete
Answer: B. Copper
Rationale: Copper is widely used for potable water distribution
because it is durable and corrosion-resistant.
,3. What does PSI stand for in plumbing?
A. Pipe Supply Indicator
B. Pounds per Square Inch
C. Pressure Supply Installation
D. Plumbing System Index
Answer: B. Pounds per Square Inch
Rationale: PSI is a common unit used to measure water and
other fluid pressures.
4. What is the purpose of a shutoff valve?
A. Increase water temperature
B. Stop or control water flow
C. Filter wastewater
D. Increase pipe diameter
Answer: B. Stop or control water flow
Rationale: Shutoff valves allow a section of a plumbing system
to be isolated for maintenance or emergencies.
5. Which tool is commonly used to tighten hexagonal
plumbing fittings?
A. Pipe wrench
B. Hacksaw
C. Tubing cutter
D. Plunger
,Answer: A. Pipe wrench
Rationale: A pipe wrench provides a strong grip for turning
threaded pipe and fittings.
6. What is the main function of a trap under a plumbing
fixture?
A. Increase water pressure
B. Prevent sewer gases from entering the building
C. Heat wastewater
D. Increase drainage speed
Answer: B. Prevent sewer gases from entering the building
Rationale: The trap retains a water seal that blocks gases from
the drainage system.
7. What is a P-trap named for?
A. Its pressure rating
B. Its shape
C. Its pipe material
D. Its installation height
Answer: B. Its shape
Rationale: A P-trap has a shape resembling the letter “P” when
viewed from the side.
, 8. What is the purpose of a vent in a drainage system?
A. To supply drinking water
B. To maintain proper air pressure in the drainage system
C. To increase water temperature
D. To filter solids
Answer: B. To maintain proper air pressure in the drainage
system
Rationale: Proper venting protects trap seals and allows
drainage to flow effectively.
9. Which tool is designed to cut copper tubing?
A. Tubing cutter
B. Pipe wrench
C. Basin wrench
D. Adjustable wrench
Answer: A. Tubing cutter
Rationale: A tubing cutter produces a clean, controlled cut on
copper and similar tubing.
10. What should be done before cutting into an existing water
line?
A. Open all faucets
B. Shut off the water supply
C. Increase water pressure
D. Remove the trap
CORRECT ANSWERS (VERIFIED ANSWERS) Q7A
2027 |INSTANT DOWNLOAD PDF
1. What is the primary purpose of a plumbing system in a
building?
A. To provide electrical power
B. To supply potable water and remove wastewater
C. To control indoor temperature
D. To provide structural support
Answer: B. To supply potable water and remove wastewater
Rationale: Plumbing systems distribute water for use and safely
convey wastewater away from the building.
2. Which material is commonly used for potable water piping?
A. PVC
B. Copper
C. Cast iron only
D. Concrete
Answer: B. Copper
Rationale: Copper is widely used for potable water distribution
because it is durable and corrosion-resistant.
,3. What does PSI stand for in plumbing?
A. Pipe Supply Indicator
B. Pounds per Square Inch
C. Pressure Supply Installation
D. Plumbing System Index
Answer: B. Pounds per Square Inch
Rationale: PSI is a common unit used to measure water and
other fluid pressures.
4. What is the purpose of a shutoff valve?
A. Increase water temperature
B. Stop or control water flow
C. Filter wastewater
D. Increase pipe diameter
Answer: B. Stop or control water flow
Rationale: Shutoff valves allow a section of a plumbing system
to be isolated for maintenance or emergencies.
5. Which tool is commonly used to tighten hexagonal
plumbing fittings?
A. Pipe wrench
B. Hacksaw
C. Tubing cutter
D. Plunger
,Answer: A. Pipe wrench
Rationale: A pipe wrench provides a strong grip for turning
threaded pipe and fittings.
6. What is the main function of a trap under a plumbing
fixture?
A. Increase water pressure
B. Prevent sewer gases from entering the building
C. Heat wastewater
D. Increase drainage speed
Answer: B. Prevent sewer gases from entering the building
Rationale: The trap retains a water seal that blocks gases from
the drainage system.
7. What is a P-trap named for?
A. Its pressure rating
B. Its shape
C. Its pipe material
D. Its installation height
Answer: B. Its shape
Rationale: A P-trap has a shape resembling the letter “P” when
viewed from the side.
, 8. What is the purpose of a vent in a drainage system?
A. To supply drinking water
B. To maintain proper air pressure in the drainage system
C. To increase water temperature
D. To filter solids
Answer: B. To maintain proper air pressure in the drainage
system
Rationale: Proper venting protects trap seals and allows
drainage to flow effectively.
9. Which tool is designed to cut copper tubing?
A. Tubing cutter
B. Pipe wrench
C. Basin wrench
D. Adjustable wrench
Answer: A. Tubing cutter
Rationale: A tubing cutter produces a clean, controlled cut on
copper and similar tubing.
10. What should be done before cutting into an existing water
line?
A. Open all faucets
B. Shut off the water supply
C. Increase water pressure
D. Remove the trap
