Backflow Prevention Practice
Exam Multiple Choices Questions
and Answers Latest 2025/2026
GRADED A+
1. Containing a plumbing system from the public water supply
requires backflow protection at the _______?
A. Appliance or fixture
B. Building foundation
C. Irrigation system
D. Service Connection
E. Sprinkler riser
- ANS - Service Connection
2. Backflow preventer manufacturers recommend that assemblies be
field-tested annually and when_____?
A. Installed
B. Moved
C. Repaired or Installed
D. Shut down
E. Water suppliers provide notice
- ANS - Repaired or Installed
3. A differential pressure gauge reading of 0.2 psid is represented on
water column sight tube by _____?
A. 1/16 in. (0.16 cm)
B. 1/2 in. (1.3 cm)
, C. 2 in. (5.1 cm)
D. 3.5 in. (8.9 cm)
E. 5.5 in. (14 cm)
- ANS - 5.5 in. (14 cm)
4. Pollution of a public water supply suggests the substance in the
water is ____?
A. Aesthetically bad
B. Biological with virus only
C. Lowering the pH below 1.4
D. Radiological
E. Toxic
- ANS - Aesthetically bad
5. Backsiphonage may occur when the pressure inside copper tubing
is ____?
A. Greater than atmospheric pressure
B. Greater than barometric pressure
C. Greater than 0 gauge pressure
D. Less than absolute pressure
E. Less than atmospheric pressure
- ANS - Less than atmospheric pressure
6. A cross-connection may be a permanent piping arrangement or a(n)
____?
A. Backflow preventer
B. Church symbol
C. OSHA hazardous area designation
D. Railroad and highway intersection sign
, E. Temporary hose bibb connection
- ANS - Temporary hose bibb connection
7. The isolation of a plumbing water system hazard requires____?
A. Appliance protection
B. Building quarantine
C. High-hazard protection
D. Meter protection
E. Toxin monitoring
- ANS - Appliance protection
8. A direct cross-connection suggests the piping system may be
subjected to ____?
A. Backpressure or backsiphonage
B. Backsiphonage only
C. Periodic inspection
D. Sustained pressure
E. Toxic materials
- ANS - Backpressure or backsiphonage
9. A pipe restriction's flow velocity increase may allow ____?
A. Aspiration
B. Backpressure
C. Low turbulence
D. Pressure head
E. Pressure surges
- ANS - Aspiration
10. Water supply contamination from backflow may result in
____?
, A. A bad taste
B. Coloration
C. Death
D. Odor or smell
E. Pipe wall mineral deposit flaking
- ANS - Death
11. To prevent backflow, an atmospheric vacuum breaker is
primarily designed to ____?
A. Allow air into the outlet piping system
B. Create an elevation loop above ground
C. Introduce head loss
D. Prevent backpressure
E. Restrict velocity
- ANS - Allow air into the outlet piping system
12. Atmospheric vacuum breakers will typically be located on
____?
A. Commercial irrigation systems
B. Fire-suppression systems
C. Plumbing fixtures or appliances
D. Utility storage tanks
E. Water service connections
- ANS - Plumbing fixtures or appliances
13. The mechanical component of an atmospheric vacuum
breaker serves as an air-inlet valve and a ____?
A. Check valve
B. Regulating valve
C. Relief valve
Exam Multiple Choices Questions
and Answers Latest 2025/2026
GRADED A+
1. Containing a plumbing system from the public water supply
requires backflow protection at the _______?
A. Appliance or fixture
B. Building foundation
C. Irrigation system
D. Service Connection
E. Sprinkler riser
- ANS - Service Connection
2. Backflow preventer manufacturers recommend that assemblies be
field-tested annually and when_____?
A. Installed
B. Moved
C. Repaired or Installed
D. Shut down
E. Water suppliers provide notice
- ANS - Repaired or Installed
3. A differential pressure gauge reading of 0.2 psid is represented on
water column sight tube by _____?
A. 1/16 in. (0.16 cm)
B. 1/2 in. (1.3 cm)
, C. 2 in. (5.1 cm)
D. 3.5 in. (8.9 cm)
E. 5.5 in. (14 cm)
- ANS - 5.5 in. (14 cm)
4. Pollution of a public water supply suggests the substance in the
water is ____?
A. Aesthetically bad
B. Biological with virus only
C. Lowering the pH below 1.4
D. Radiological
E. Toxic
- ANS - Aesthetically bad
5. Backsiphonage may occur when the pressure inside copper tubing
is ____?
A. Greater than atmospheric pressure
B. Greater than barometric pressure
C. Greater than 0 gauge pressure
D. Less than absolute pressure
E. Less than atmospheric pressure
- ANS - Less than atmospheric pressure
6. A cross-connection may be a permanent piping arrangement or a(n)
____?
A. Backflow preventer
B. Church symbol
C. OSHA hazardous area designation
D. Railroad and highway intersection sign
, E. Temporary hose bibb connection
- ANS - Temporary hose bibb connection
7. The isolation of a plumbing water system hazard requires____?
A. Appliance protection
B. Building quarantine
C. High-hazard protection
D. Meter protection
E. Toxin monitoring
- ANS - Appliance protection
8. A direct cross-connection suggests the piping system may be
subjected to ____?
A. Backpressure or backsiphonage
B. Backsiphonage only
C. Periodic inspection
D. Sustained pressure
E. Toxic materials
- ANS - Backpressure or backsiphonage
9. A pipe restriction's flow velocity increase may allow ____?
A. Aspiration
B. Backpressure
C. Low turbulence
D. Pressure head
E. Pressure surges
- ANS - Aspiration
10. Water supply contamination from backflow may result in
____?
, A. A bad taste
B. Coloration
C. Death
D. Odor or smell
E. Pipe wall mineral deposit flaking
- ANS - Death
11. To prevent backflow, an atmospheric vacuum breaker is
primarily designed to ____?
A. Allow air into the outlet piping system
B. Create an elevation loop above ground
C. Introduce head loss
D. Prevent backpressure
E. Restrict velocity
- ANS - Allow air into the outlet piping system
12. Atmospheric vacuum breakers will typically be located on
____?
A. Commercial irrigation systems
B. Fire-suppression systems
C. Plumbing fixtures or appliances
D. Utility storage tanks
E. Water service connections
- ANS - Plumbing fixtures or appliances
13. The mechanical component of an atmospheric vacuum
breaker serves as an air-inlet valve and a ____?
A. Check valve
B. Regulating valve
C. Relief valve
