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OKLAHOMA HOME INSPECTOR LICENSE
EXAM QUESTIONS AND CORRECT
ANSWERS (VERIFIED ANSWERS) PLUS
RATIONALES 2025
- What is the minimum headroom required above a stair tread in a residential home in Oklahoma? A. 6 feet B. 6 feet 8 inches C. 7 feet D. 5 feet 10 inches Rationale: The IRC requires at least 6 feet 8 inches of headroom measured vertically from the tread nosing to the ceiling.
- Which component prevents sewer gases from entering a home? A. Check valve B. Cleanout C. Trap D. Vent pipe
Rationale: A trap is a U-shaped pipe that retains water and prevents sewer gases from entering the living space.
- Double tapping is generally not allowed in: A. Gas meters B. Circuit breakers C. Water meters D. Plumbing cleanouts Rationale: Double tapping in an electrical panel can cause overheating and is typically not permitted unless the breaker is rated for it.
- Which roofing material typically has the shortest lifespan? A. Metal B. Clay tile C. Asphalt shingles D. Slate Rationale: Asphalt shingles usually last 15–30 years, whereas other materials like slate and metal have much longer lifespans.
- A GFCI outlet is required in which of the following areas? A. Bedroom B. Bathroom C. Hallway D. Dining room Rationale: GFCI outlets are required in wet or damp locations, including bathrooms.
A. 6 inches B. 5 inches C. 3 inches D. 4 inches Rationale: Openings in guardrails should not allow the passage of a 4-inch diameter sphere. 10.The term "flashing" in roofing refers to: A. A venting technique B. A method to prevent water penetration at joints C. A type of underlayment D. An attic access cover Rationale: Flashing is used to direct water away from seams, joints, and roof penetrations. 11.Which of the following is considered a safety hazard during a home inspection? A. Low water pressure B. Broken light bulb C. Exposed electrical wires D. Loose cabinet doors Rationale: Exposed wiring poses a significant risk of shock or fire and must be reported. 12.The purpose of a thermal expansion tank is to:
A. Cool down overheated water B. Increase water heater efficiency C. Absorb pressure changes in a closed water system D. Prevent backflow into the public system Rationale: Expansion tanks absorb increased pressure from heated water in closed plumbing systems. 13.What is the function of a TPR valve on a water heater? A. Regulates temperature B. Prevents excessive pressure or temperature buildup C. Measures water level D. Acts as a shut-off valve Rationale: A temperature-pressure relief (TPR) valve releases water if temperature or pressure gets too high. 14.Aluminum branch wiring is a concern because: A. It is too expensive B. It requires specialized breakers C. It is prone to oxidation and overheating D. It is banned in all states Rationale: Aluminum wiring expands and contracts, loosening connections and increasing fire risk. 15.The slope of a drain pipe should be: A. 1/2 inch per foot B. 1/4 inch per foot C. 3/4 inch per foot
19.An anti-tip bracket is required on: A. Dishwashers B. Clothes dryers C. Freestanding ranges D. Gas furnaces Rationale: Anti-tip brackets prevent ranges from tipping forward when weight is applied to an open door. 20.The main panel should have a: A. Lock B. Sticker C. Main disconnect D. Surge protector Rationale: The main disconnect allows the entire electrical system to be shut off safely. 21.What is the purpose of a vapor barrier in a crawlspace? A. Reflects heat B. Increases airflow C. Prevents moisture from soil entering the home D. Filters radon Rationale: Vapor barriers block moisture migration from the ground, helping control humidity. 22.What is a common cause of roof leaks near chimneys?
A. Missing shingles B. Improper flashing C. Too many attic vents D. Poor attic insulation Rationale: Chimney leaks are commonly due to flashing failures. 23.Which tool is used to measure moisture content in wood? A. Thermometer B. Moisture meter C. Manometer D. Infrared camera Rationale: Moisture meters provide a percentage value of moisture in materials. 24.What type of circuit breaker trips due to arc faults? A. GFCI B. Standard C. AFCI D. Tandem Rationale: AFCI breakers detect dangerous electrical arcs to prevent fires. 25.The Oklahoma Home Inspector Licensing Act is enforced by: A. The State Senate B. The Department of Commerce C. The Department of Insurance D. Oklahoma Construction Industries Board Rationale: The CIB administers home inspector licensing in Oklahoma.
A. Single-pane B. Metal frame C. Double-pane low-E glass D. Decorative glass Rationale: Double-pane windows with low-E coatings reduce heat transfer and improve efficiency. 30.A sump pump is installed to: A. Lower humidity B. Reduce water pressure C. Remove water from basements or crawlspaces D. Circulate HVAC air Rationale: Sump pumps evacuate water that accumulates in lower areas. 31.What is the primary purpose of grounding in an electrical system? A. Increase electrical current B. Protect appliances from damage C. Provide a safe path for electrical faults D. Improve energy efficiency Rationale: Grounding helps prevent electrical shock and fire by providing a safe path for stray currents. 32.The presence of efflorescence on a basement wall indicates: A. Mold growth B. Water intrusion
C. Termite damage D. Structural cracks Rationale: Efflorescence is a white, powdery deposit caused by water moving through masonry and depositing salts. 33.Which of the following plumbing materials is most resistant to corrosion? A. Galvanized steel B. PVC (Polyvinyl chloride) C. Copper D. Cast iron Rationale: PVC is plastic and not susceptible to corrosion like metal pipes. 34.What is the minimum width for a residential hallway? A. 24 inches B. 36 inches C. 42 inches D. 48 inches Rationale: The IRC requires at least 36 inches clear width for hallways to allow safe passage. 35.A dryer vent should be: A. Made of plastic B. Rigid metal duct C. Flexible plastic tubing D. Flexible foil tubing Rationale: Rigid metal ducts reduce fire risk and lint buildup compared to plastic or flexible ducts.
A. New electrical installation B. Safe wiring practice C. An outdated wiring system D. Underground wiring Rationale: Knob and tube wiring is an old wiring method, often considered a safety concern. 40.What does an R-value measure? A. Electrical resistance B. Thermal resistance of insulation C. Water resistance of roofing D. Air flow efficiency Rationale: R-value indicates the effectiveness of insulation in resisting heat flow. 41.A GFCI outlet trips when: A. Voltage increases above 120V B. Current flows normally C. A ground fault is detected D. The circuit is overloaded Rationale: GFCIs detect ground faults where current escapes the circuit path and trip to prevent shock. 42.Which venting method is required for gas water heaters? A. Direct vent B. Power vent
C. Atmospheric vent D. No vent required Rationale: Atmospheric vents allow combustion gases to rise naturally and safely exit the home. 43.What type of inspection tool uses infrared technology to detect temperature differences? A. Moisture meter B. Manometer C. Thermal imaging camera D. Electrical tester Rationale: Infrared cameras detect heat variations useful for identifying moisture, insulation gaps, or electrical hotspots. 44.The term “load-bearing wall” refers to: A. A wall with electrical wiring B. A decorative partition C. A wall that supports structural weight D. A wall with plumbing Rationale: Load-bearing walls carry the weight of elements above them down to the foundation. 45.What is the correct placement of a carbon monoxide detector? A. Inside the kitchen B. Inside a bathroom C. Outside sleeping areas D. In a closet
49.Which foundation type is most common in Oklahoma? A. Basement B. Slab-on-grade C. Crawlspace with wood piers D. Stone foundation Rationale: Due to soil and climate conditions, slab-on-grade foundations are prevalent in Oklahoma. 50.What is the minimum thickness of drywall on ceilings in residential buildings? A. 1/8 inch B. 1/4 inch C. 1/2 inch D. 5/8 inch Rationale: Standard ceiling drywall is typically 1/2 inch thick to prevent sagging. 51.What causes “thermal bridging” in a building envelope? A. Air leaks through windows B. Conductive materials bypassing insulation C. Moisture buildup in walls D. Improper HVAC design Rationale: Thermal bridging occurs when conductive materials like metal studs allow heat flow, reducing insulation effectiveness. 52.Which of the following is a sign of potential termite damage?
A. Water stains B. Mud tubes along foundation walls C. Rust on metal components D. Cracks in drywall Rationale: Termites build mud tubes for moisture and protection while traveling. 53.What is the primary safety concern with aluminum wiring in homes? A. Electrical noise B. Higher cost C. Increased fire risk due to loose connections D. Compatibility with all breakers Rationale: Aluminum wiring oxidizes and can loosen connections, leading to overheating. 54.Which system is responsible for exhausting air from kitchens and bathrooms? A. HVAC return B. Exhaust fans C. Fresh air intake D. Supply vents Rationale: Exhaust fans remove odors, moisture, and contaminants from specific rooms. 55.The crawlspace ventilation openings should be located: A. Only on one side B. On at least two opposing sides C. Near the ceiling level
D. Awning Rationale: Casement windows swing open outward, allowing access to both sides. 59.When inspecting attic insulation, the inspector should check: A. Only the thickness B. Only the material type C. Thickness, condition, and proper coverage D. Only for moisture Rationale: Insulation effectiveness depends on depth, material, and being free of moisture or gaps. 60.What is the minimum size of a residential water supply line? A. 1/2 inch B. 3/4 inch C. 1 inch D. 1 1/4 inch Rationale: 3/4 inch is a common minimum supply size to ensure adequate flow. 61.The function of a “drip edge” on a roof is to: A. Ventilate the attic B. Direct water off the roof edge and protect fascia C. Insulate the roof deck D. Support shingles
Rationale: Drip edges prevent water from running behind gutters and damaging fascia. 62.What type of furnace is common in Oklahoma homes? A. Radiant floor heat B. Electric baseboard C. Forced air gas furnace D. Geothermal Rationale: Forced air gas furnaces are widely used due to climate and fuel availability. 63.What is the common cause of “creaking” floors? A. Moisture damage B. Loose nails or boards C. Structural settling and movement D. Improper insulation Rationale: Movement between floor joists and subfloor causes creaking noises. 64.Which plumbing fixture should have an air gap to prevent contamination? A. Toilet B. Bathtub C. Dishwasher drain D. Shower drain Rationale: Air gaps prevent backflow contamination in dishwasher drains. 65.A home inspector finds a door that does not latch properly. This is:
