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IAAI CFI Study Questions (2025) With
Well Explained Answer Graded A+
Combustible Liquid
A liquid with a flash point ABOVE 100F
If the current flowing out from an electrical panel is 12.5 amps, and it then flows through an electrical load of 1500 watts, what is the amperage of the remaining current flow of the return circuit?
If a hair dryer draws 8.3amps (in a home with 120-volt service), what is the wattage?
*Power (P) = current (I) x voltage (V)
Watts = amps x volts
The year of the first edition of NFPA 1033
1.5 times
The recommended distance for securing the perimeter of a blast scene
*That is, the distance from the furthest debris
1100°F
What temperature in the upper gas layer causes the onset of Flashover?
1960°F
The temperature at which copper melts
2 W/cm
The measurement of the radiant heat flux (from gas layer to the floor) that indicates the onset of flashover
240 volts
The voltage between the two hot wires at the service entrance cables in most single-family residences in the United States (single-phase service with three wires)
3 years
The revision cycle for NFPA 921 (timespan)
This concept should not be included in a summary report of findings.
Admiralty Law
A law that may govern the fire investigation of a boat
After-market Equipment
A type of device in a vehicle, which can cause an electrical overload to factory installed wiring
Alive and Breathing
Evidence of smoke or soot in the lungs, bronchi, and trachea is one of the most significant factors in confirming that, at the time of the fire, the victim was WHAT?
All Team Members
Those who have the responsibility for monitoring safety conditions at the fire or explosion scene
1220°F
The melting temperature of aluminum
Aluminum-to-pavement sparks
Which one of these is NOT considered a competent ignition source?
Metal-to-metal sparks,
Aluminum-to-pavement sparks,
Metal-to-pavement sparks,
Motor bearing sparks
Heat Release Rate
A meaningful analysis of a fire requires an understanding of the fire growth, the total heat released, and WHAT?
Arc-fault circuit interrupter
What does he term AFCI stand for? And, the "A" specifically represents what?
ASTM
The organization that develops standard methods for testing materials
Auto-ignition
Initiation of combustion by heat but without a spark or flame
Backdraft
A deflagration resulting from the sudden introduction of air into a confined space containing oxygen- deficient products of incomplete combustion
BLEVE
This may occur when the vapor pressure of a liquid exceeds atmospheric pressure
*And this is the most common mechanical explosion
Boiling Point
The temperature or point at which the vapor pressure of a liquid equals the external pressure applied
Bonding
The process of electrically connecting two or more conductive objects
Bottom Passenger Side of the Windshield
Most engine fires typically penetrate the interior compartment at this location of the vehicle
Brass Prongs (male ends)
An investigator can closely examine this component of a cord to determine if it was plugged into a receptacle
Calcination
The chemical and physical changes that occur in gypsum wallboard surfaces during a fire
Carbon Monoxide
A narcotic gas that one might be exposed to in the fire
Carbon Monoxide
The levels of this toxin dissipate over time after removal from the fire environment.
Carbon Monoxide Poisoning
This toxic condition does NOT cause a cherry-pink coloration to the skin of the fire victim and is NOT visible on all skin types
Carburetor Backfire
This occurrence is the most common open-flame ignition source in non-fuel injected vehicles
Ceiling jet
When the fire plume reaches the ceiling of a room and moves laterally along the ceiling
Christmas Tree
Compartmentation
A building design feature that aims to limit the fire to its origin.
Competent Ignition Source
Located at the origin, these should be considered individually during the development of a cause hypothesis
Complete PPE
This should be donned when dealing with hazardous chemicals
Conduction
An example of heat transfer, when the heating of a steel beam to an unexposed part of a building results in a fire in that location
Connection Points
Overheating on a circuit is most likely to occur at this location on a circuit
Joint Investigation
Consensus agreement between interested parties should be developed prior to the commencement of WHAT?
Crazing
Complicated patterns in glass
Crime Scenes
A type of scene or circumstances, in which fires do NOT always destroy all physical evidence
Current (amperage)
A factor in OHM's law that can be calculated if you know resistance and voltage
Deductive Reasoning
The reasoning in the scientific method used to test an hypothesis
Deductive Reasoning
The reasoning process of moving from generalizations to particular assertion
(*"Reduce to Deduce"
*Test hypothesis ("deduce")
*Test based on known facts
*More confident assertion than induction)
Documentation
A key method used by investigators when an appliance is determined to be in the area of origin, particularly the positioning of all controls and components.
DOT Standards
The standards that gas cylinders must conform to
(Dept. of Transportation)
Dual Element Fuses
Types of fuses that have one element for overloads and another element for short circuits
Dust Explosion
A particular type of an explosion that does NOT often result in pronounced seats of explosion
Dust Explosion
An explosion that most often occurs in confined areas of relatively wide dispersal, where combustible dust can accumulate in sufficient quantity to support a propagating reaction.
Engine Oil Analysis
This analysis may be performed to determine the pre-fire condition of the engine and to establish possible motive for the destruction of the vehicle.
Evidence
The fire scene itself needs to be considered as WHAT?
Evidence Collection
The process of photographing an item, then collecting, tagging and putting it in a log
Evidence Collection and Documentation
The importance of this fire investigative practice is no different in wildfire investigations, compared to structural fires.
Evidence Custodian
The person at a fire scene who manages various aspects of the evidence collection process, including an evidence log and evidence bagging, tagging, preservation and storage
Exigent Circumstances
The justification used to enter a property in order to extinguish a fire
This investigative determination is based on witness information, fire patterns, arc mapping, and fire dynamics
Fire Scene Access
The fifth and sixth amendments DO NOT answer questions regarding constitutional protections in relation to WHAT fire investigation aspect?
(4th amendment issue)
Fire Scene Reconstruction
Recreating pre-fire positions of contents
Fire-rated Door
This type of door must be used when installed in a fire-rated wall.
First or Second Degree Burns
This is the typical extent of thermal injuries sustained from an explosion flame front, due to the very short duration.
Flame Spread Rating
A system used to rate a material's flame spread potential.
*And these are the categories:
Class A: Flame spread index 0- 25
Class B: Flame spread index 26- 75
Class C: Flame spread index 76- 200
Flammable Gases
This type of fuel can only be ignited by a spark or pilot flame over specific ranges of gas concentration
Flammable Liquid
A liquid with a flash point below 100*F
Flash point
The characteristic of an appropriate mixture of vapor-to-air, which will cause it to ignite when subjected to an ignition source
Flash Point
A specific fuel characteristic, which will have little or no significance when the fuel is released in a spray form.
Flashover
In this phenomenon, the radiant ignition of exposed combustible materials is key
Fuel load
Total quantity of combustible contents of a building, space, or fire area (expressed in heat units or the equivalent weight in wood)
Fuel System
This system in a vehicle has the following sequence of components:
Fuel tank, fuel pump, fuel injector/carburetor, manifold, and cylinders.
Fuel-controlled Burning
Type of burning that occurs in the early stages of a compartment fire
Remote Area
The location where firefighters should re-fuel all gas-powered equipment
(away from the fire scene)
Government Institute
NFPA is not this type of institute
Guide
NFPA 921 is this type of document
Guidelines
The information presented in NFPA 921 establishes WHAT?
Hazards
Biological, chemical, physical, and radiological are examples of this concept that fire investigators should be aware of when investigating a fire scene
Header
The first cutting unit on a combine
Heat flux
The measure of the rate of heat transfer to a surface
Heat of Combustion
The amount of heat released during complete combustion, which is considered a constant for a specific fuel
(Generally considered a material property and therefore a constant for a specific fuel)
