National Home inspector exam 494 Questions And Answers
2025\2026
At what level would water pressure within a single-family dwelling
begin to be considered excessive and require correction - CORRECT
ANSWER-80 PSI
buckling in horizontal vinyl siding is generally caused by - CORRECT
ANSWER-improper fastening
A newer home with electric heat is being inspected. It has a below
grade finished basement containing a bedroom. The inspector should
look for a smoke alarm and - CORRECT ANSWER-an escape and rescue
opening
A swimming pool fence must prevent passage of a sphere that is larger
than - CORRECT ANSWER-4 inches
If water infiltration is suspected behind a finished surface, what tool
would be the best choice to verify dampness? - CORRECT ANSWER-non-
contact moisture meter
, Gas-fired furnace heat exchangers most often fail from - CORRECT
ANSWER-rust and metal fatigue
relative humidity (RH) is expressed as - CORRECT ANSWER-percentage
Connections of dissimilar metal in a plumbing system, such as
galvanized steel pipe and copper pipe, will usually cause - CORRECT
ANSWER-electrolysis
A ground fault circuit interrupter (GFCI) is a safety device that -
CORRECT ANSWER-disconnects the power when sensing current
leakage to ground
An electrical system with a fuse on the neutral conductor and on the
energized (hot) conductors - CORRECT ANSWER-is hazardous and
should be corrected
To operate a central air conditioner, an electric clothes dryer, and and
electric range, the ampacity of the service to the house should be AT
LEAST - CORRECT ANSWER-100 amps at 240 volts
A floor joist in a crawl space has been cut where the toilet drain passes
through the floor. the joists are 2x6 spaced at 16" on center. The
2025\2026
At what level would water pressure within a single-family dwelling
begin to be considered excessive and require correction - CORRECT
ANSWER-80 PSI
buckling in horizontal vinyl siding is generally caused by - CORRECT
ANSWER-improper fastening
A newer home with electric heat is being inspected. It has a below
grade finished basement containing a bedroom. The inspector should
look for a smoke alarm and - CORRECT ANSWER-an escape and rescue
opening
A swimming pool fence must prevent passage of a sphere that is larger
than - CORRECT ANSWER-4 inches
If water infiltration is suspected behind a finished surface, what tool
would be the best choice to verify dampness? - CORRECT ANSWER-non-
contact moisture meter
, Gas-fired furnace heat exchangers most often fail from - CORRECT
ANSWER-rust and metal fatigue
relative humidity (RH) is expressed as - CORRECT ANSWER-percentage
Connections of dissimilar metal in a plumbing system, such as
galvanized steel pipe and copper pipe, will usually cause - CORRECT
ANSWER-electrolysis
A ground fault circuit interrupter (GFCI) is a safety device that -
CORRECT ANSWER-disconnects the power when sensing current
leakage to ground
An electrical system with a fuse on the neutral conductor and on the
energized (hot) conductors - CORRECT ANSWER-is hazardous and
should be corrected
To operate a central air conditioner, an electric clothes dryer, and and
electric range, the ampacity of the service to the house should be AT
LEAST - CORRECT ANSWER-100 amps at 240 volts
A floor joist in a crawl space has been cut where the toilet drain passes
through the floor. the joists are 2x6 spaced at 16" on center. The
