NATIONAL HOME INSPECTOR
CERTIFICATION TEST PAPER QUESTIONS
AND SOLUTIONS VERIFIED ANSWERS
●● What are the 3 prohibited traps?
A. P trap, S trap and Drum Trap
B. Drum Trap, Bell Trap and P Trap
C. S Trap, Drum Trap and Bell Trap
D. S Trap, Bell Trap and P Trap
Answer: C. S Trap, Drum Trap and Bell Trap
●● What does an Air Admittance Valve do?
A. It detects negative air pressure to allow air into pipes and closes to
prevent sewer gases from entering.
B. It allows air into vents from the attic
C. It detects positive air pressure to allow air into pipes
D. It allows air inside the home when negative pressure from the outside
is detected
Answer: A. It detects negative air pressure to allow air into pipes and
closes to prevent sewer gases from entering.
,●● An accessible shutoff valve for each gas appliance should be located
where?
A. At the main gas line or within 8 feet from appliance
B. In the same room as appliance and within 6 feet from appliance
C. On the appliance or within 15 feet from appliance
D. In the same room as appliance and within 12 feet from appliance.
Answer: B. In the same room as appliance and within 6 feet from
appliance
●● What are the 3 most common kinds of retaining walls made from?
A. Metal, Masonry, Concrete
B. Wood, Metal, PVC
C. Wood, Masonry, Concrete
D. Gravel, Wood, Cement
Answer: C. Wood, Masonry, Concrete
●● CMU stands for ____________.
A. Concrete Masonry Unit
B. Cement Masonry Unit
,C. Cinder Block Masonry Unit
D. Compressed Masonry Unit
Answer: A. Concrete Masonry Unit
●● CMUs in taller retaining walls should be grouted and reinforced with
_______.
A. Steel
B. Mortar
C. Wood
D. Brick
Answer: A. Steel
●● Retaining walls should have _______ on the outside to secure the
wall.
A. beams
B. shoring (vertical posts)
C. pillars
D. columns
Answer: B. shoring (vertical posts)
, ●● Retaining walls can be anchored through the soil using
_____________.
A. concrete
B. concrete and tie-backs
C. deadman and tie-backs
D. shoring posts
Answer: C. deadman, tie-backs
●● Proper slope away from foundation within the first 10 feet should be
how many inches?
A. 5 inches
B. 6 inches
C. 4 inches
D. 8 inches
Answer: B. 6 inches
●● Spalling and efflorescence is usually an indication of
_______________.
A. An earthquake
B. Foundation damage
CERTIFICATION TEST PAPER QUESTIONS
AND SOLUTIONS VERIFIED ANSWERS
●● What are the 3 prohibited traps?
A. P trap, S trap and Drum Trap
B. Drum Trap, Bell Trap and P Trap
C. S Trap, Drum Trap and Bell Trap
D. S Trap, Bell Trap and P Trap
Answer: C. S Trap, Drum Trap and Bell Trap
●● What does an Air Admittance Valve do?
A. It detects negative air pressure to allow air into pipes and closes to
prevent sewer gases from entering.
B. It allows air into vents from the attic
C. It detects positive air pressure to allow air into pipes
D. It allows air inside the home when negative pressure from the outside
is detected
Answer: A. It detects negative air pressure to allow air into pipes and
closes to prevent sewer gases from entering.
,●● An accessible shutoff valve for each gas appliance should be located
where?
A. At the main gas line or within 8 feet from appliance
B. In the same room as appliance and within 6 feet from appliance
C. On the appliance or within 15 feet from appliance
D. In the same room as appliance and within 12 feet from appliance.
Answer: B. In the same room as appliance and within 6 feet from
appliance
●● What are the 3 most common kinds of retaining walls made from?
A. Metal, Masonry, Concrete
B. Wood, Metal, PVC
C. Wood, Masonry, Concrete
D. Gravel, Wood, Cement
Answer: C. Wood, Masonry, Concrete
●● CMU stands for ____________.
A. Concrete Masonry Unit
B. Cement Masonry Unit
,C. Cinder Block Masonry Unit
D. Compressed Masonry Unit
Answer: A. Concrete Masonry Unit
●● CMUs in taller retaining walls should be grouted and reinforced with
_______.
A. Steel
B. Mortar
C. Wood
D. Brick
Answer: A. Steel
●● Retaining walls should have _______ on the outside to secure the
wall.
A. beams
B. shoring (vertical posts)
C. pillars
D. columns
Answer: B. shoring (vertical posts)
, ●● Retaining walls can be anchored through the soil using
_____________.
A. concrete
B. concrete and tie-backs
C. deadman and tie-backs
D. shoring posts
Answer: C. deadman, tie-backs
●● Proper slope away from foundation within the first 10 feet should be
how many inches?
A. 5 inches
B. 6 inches
C. 4 inches
D. 8 inches
Answer: B. 6 inches
●● Spalling and efflorescence is usually an indication of
_______________.
A. An earthquake
B. Foundation damage
