FLORIDA PLUMBING CONTRACTOR EXAM NEWEST
2026 EXAM COMPLETE 100 QUESTIONS AND
CORRECT DETAILED ANSWERS (VERIFIED
ANSWERS) |ALREADY GRADED A+
1. Which of the following is the primary purpose of a backflow preventer?
A) To regulate water pressure
B) To prevent water from flowing back into the potable water supply
C) To increase water flow rate
D) To reduce water consumption
B) To prevent water from flowing back into the potable water supply
Backflow preventers are installed to prevent contaminated water from
flowing back into the public water supply, ensuring the safety of drinking
water.
2. What is the standard pipe size for a residential water main?
A) 1/2 inch
B) 3/4 inch
C) 1 inch
D) 2 inches
C) 1 inch
For most residential applications, a 1-inch water main is commonly used to
ensure adequate water pressure and flow for typical household needs.
3. Which type of pipe is commonly used for drainage systems in residential
plumbing?
A) Copper
B) PVC
C) PEX
D) Galvanized steel
B) PVC
, PVC pipes are commonly used for drainage systems due to their cost-
effectiveness, durability, and ease of installation.
4. What does the term "pitch" refer to in a plumbing drain system?
A) The angle of the pipe
B) The pipe diameter
C) The type of material used for the pipe
D) The length of the drain pipe
A) The angle of the pipe
Pitch refers to the slope or angle of a drain pipe, which is typically a 1/4-inch
per foot slope to ensure proper drainage.
5. What is the minimum clearance required between a water heater and any
combustible materials?
A) 6 inches
B) 12 inches
C) 18 inches
D) 24 inches
B) 12 inches
Most building codes require at least 12 inches of clearance between a water
heater and combustible materials for safety reasons.
6. What is the function of a trap in a plumbing system?
A) To prevent water from flowing through the system
B) To hold water and create a seal that prevents sewer gases from entering
the building
C) To regulate water pressure
D) To increase the flow of water through the system
B) To hold water and create a seal that prevents sewer gases from
entering the building
A trap, typically in the form of a P-trap, holds a small amount of water to
create a barrier that blocks sewer gases from entering the home.
7. Which type of water pipe is most commonly used for residential cold-
water distribution?
, A) Copper
B) PVC
C) CPVC
D) PEX
D) PEX
PEX pipes are increasingly used for residential water distribution due to their
flexibility, resistance to freezing, and ease of installation.
8. What is the minimum depth at which a water supply line should be buried
to prevent freezing in colder climates?
A) 12 inches
B) 18 inches
C) 24 inches
D) 36 inches
C) 24 inches
In colder climates, water supply lines must be buried at least 24 inches to
prevent them from freezing during the winter months.
9. Which of the following is a common cause of low water pressure in a
plumbing system?
A) Leaky faucet
B) Clogged aerator
C) Faulty water meter
D) All of the above
D) All of the above
Low water pressure can be caused by a variety of issues, including leaks,
clogged aerators, or problems with the water meter.
10.What is the function of a pressure-reducing valve (PRV) in a plumbing
system?
A) To increase water pressure
B) To regulate and reduce excessive water pressure
C) To prevent water from flowing back into the system
D) To filter out sediment from the water
2026 EXAM COMPLETE 100 QUESTIONS AND
CORRECT DETAILED ANSWERS (VERIFIED
ANSWERS) |ALREADY GRADED A+
1. Which of the following is the primary purpose of a backflow preventer?
A) To regulate water pressure
B) To prevent water from flowing back into the potable water supply
C) To increase water flow rate
D) To reduce water consumption
B) To prevent water from flowing back into the potable water supply
Backflow preventers are installed to prevent contaminated water from
flowing back into the public water supply, ensuring the safety of drinking
water.
2. What is the standard pipe size for a residential water main?
A) 1/2 inch
B) 3/4 inch
C) 1 inch
D) 2 inches
C) 1 inch
For most residential applications, a 1-inch water main is commonly used to
ensure adequate water pressure and flow for typical household needs.
3. Which type of pipe is commonly used for drainage systems in residential
plumbing?
A) Copper
B) PVC
C) PEX
D) Galvanized steel
B) PVC
, PVC pipes are commonly used for drainage systems due to their cost-
effectiveness, durability, and ease of installation.
4. What does the term "pitch" refer to in a plumbing drain system?
A) The angle of the pipe
B) The pipe diameter
C) The type of material used for the pipe
D) The length of the drain pipe
A) The angle of the pipe
Pitch refers to the slope or angle of a drain pipe, which is typically a 1/4-inch
per foot slope to ensure proper drainage.
5. What is the minimum clearance required between a water heater and any
combustible materials?
A) 6 inches
B) 12 inches
C) 18 inches
D) 24 inches
B) 12 inches
Most building codes require at least 12 inches of clearance between a water
heater and combustible materials for safety reasons.
6. What is the function of a trap in a plumbing system?
A) To prevent water from flowing through the system
B) To hold water and create a seal that prevents sewer gases from entering
the building
C) To regulate water pressure
D) To increase the flow of water through the system
B) To hold water and create a seal that prevents sewer gases from
entering the building
A trap, typically in the form of a P-trap, holds a small amount of water to
create a barrier that blocks sewer gases from entering the home.
7. Which type of water pipe is most commonly used for residential cold-
water distribution?
, A) Copper
B) PVC
C) CPVC
D) PEX
D) PEX
PEX pipes are increasingly used for residential water distribution due to their
flexibility, resistance to freezing, and ease of installation.
8. What is the minimum depth at which a water supply line should be buried
to prevent freezing in colder climates?
A) 12 inches
B) 18 inches
C) 24 inches
D) 36 inches
C) 24 inches
In colder climates, water supply lines must be buried at least 24 inches to
prevent them from freezing during the winter months.
9. Which of the following is a common cause of low water pressure in a
plumbing system?
A) Leaky faucet
B) Clogged aerator
C) Faulty water meter
D) All of the above
D) All of the above
Low water pressure can be caused by a variety of issues, including leaks,
clogged aerators, or problems with the water meter.
10.What is the function of a pressure-reducing valve (PRV) in a plumbing
system?
A) To increase water pressure
B) To regulate and reduce excessive water pressure
C) To prevent water from flowing back into the system
D) To filter out sediment from the water
