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IAAI CFI Exam LATEST 2025 UPDATE WITH COMPLETE
QUESTIONS AND CORRECTLY WELL DEFINED ANSWERS
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The year of the first edition of NFPA 1033 - CORRECT ANSWER- 1987 The recommended distance for securing the perimeter of a blast scene *That is, the distance from the furthest debris - CORRECT ANSWER- 1.5 times What temperature in the upper gas layer causes the onset of Flashover? - CORRECT ANSWER- 1100°F The temperature at which copper melts - CORRECT ANSWER- 1960°F The measurement of the radiant heat flux (from gas layer to the floor) that indicates the onset of flashover - CORRECT ANSWER- 2 W/cm A liquid with a flash point ABOVE 100F - CORRECT ANSWER- Combustible Liquid
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? - CORRECT ANSWER- 12. 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 - CORRECT ANSWER- 1000 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) - CORRECT ANSWER- 240 volts The revision cycle for NFPA 921 (timespan) - CORRECT ANSWER- 3 years The flash point of power steering fluid - CORRECT ANSWER- 350°F In high-pressure fuel-injected vehicles, this is the typical range of pressure that is used to pump fuel from a fuel tank - CORRECT ANSWER- 35 - 70 p.s.i. The lower explosive and upper explosive limit of natural gas (methane)? - CORRECT ANSWER- 5 and 17 The ignition temperature of power steering fluid - CORRECT ANSWER- 680°F
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 - CORRECT ANSWER- Aluminum-to-pavement sparks A meaningful analysis of a fire requires an understanding of the fire growth, the total heat released, and WHAT? - CORRECT ANSWER- Heat Release Rate What does he term AFCI stand for? And, the "A" specifically represents what? - CORRECT ANSWER- Arc-fault circuit interrupter The organization that develops standard methods for testing materials - CORRECT ANSWER- ASTM Initiation of combustion by heat but without a spark or flame - CORRECT ANSWER- Auto-ignition A deflagration resulting from the sudden introduction of air into a confined space containing oxygen-deficient products of incomplete combustion - CORRECT ANSWER- Backdraft
An explosion caused by a combination of combustible materials heated to the ignition point and a sudden introduction of oxygen to support combustion - CORRECT ANSWER- Backdraft A boat device that owners fail to keep clean, which is a frequent cause of engine compartment fires on boats - CORRECT ANSWER- Backfire Flame Arrestor A device on a fluorescent light fixture that transforms the voltage from normal household voltage to a higher voltage - CORRECT ANSWER- Ballast The starter motor draws its energy from this source - CORRECT ANSWER- Battery The burden of proof in a criminal trial - CORRECT ANSWER- Beyond a Reasonable Doubt The component that controls temperature in many heat-producing appliances - CORRECT ANSWER- Bimetallic Thermostats This may occur when the vapor pressure of a liquid exceeds atmospheric pressure *And this is the most common mechanical explosion - CORRECT ANSWER- BLEVE The temperature or point at which the vapor pressure of a liquid equals the external pressure applied - CORRECT ANSWER- Boiling Point
When the fire plume reaches the ceiling of a room and moves laterally along the ceiling - CORRECT ANSWER- Ceiling jet An item in the home that burns at a peak HRR of 3000-5000kW, which is hotter than a pool of gasoline or a polyurethane chair - CORRECT ANSWER- Christmas Tree This occurs when intense radiated heat or direct flame contacts a surface during the fire, burning away deposits - CORRECT ANSWER- Clean Burn This is a fire effect to furniture that does NOT provide the investigators with clues concerning the type of ignition source, but can show fire spread and intensity - CORRECT ANSWER- Collapsed Furniture Springs A fire characteristic that is NOT necessarily an accurate indicator of the flame temperature - CORRECT ANSWER- Color This feature distinguishes the heat-sensitive bulbs of sprinkler heads from each other - CORRECT ANSWER- Color Codes A chemical process of oxidation, which occurs at a rate fast enough to produce heat and usually light in the form of either a glow or a flame - CORRECT ANSWER- Combustion
A building design feature that aims to limit the fire to its origin. - CORRECT ANSWER- Compartmentation Located at the origin, these should be considered individually during the development of a cause hypothesis - CORRECT ANSWER- Competent Ignition Source This should be donned when dealing with hazardous chemicals - CORRECT ANSWER- Complete PPE 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 - CORRECT ANSWER- Conduction Overheating on a circuit is most likely to occur at this location on a circuit - CORRECT ANSWER- Connection Points Consensus agreement between interested parties should be developed prior to the commencement of WHAT? - CORRECT ANSWER- Joint Investigation Complicated patterns in glass - CORRECT ANSWER- Crazing A type of scene or circumstances, in which fires do NOT always destroy all physical evidence - CORRECT ANSWER- Crime Scenes
The ordinary sustained burning mode in most fires - CORRECT ANSWER- Diffusion Flame Burning By taking these two steps, an investigator can obtain the manufacturer's name, model & serial numbers, manufacture date, and any warnings on an appliance, determined to be in the area of fire origin - CORRECT ANSWER- Document and Carefully Move What type of evidence is an investigator's report? - CORRECT ANSWER- Documentary Evidence 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. - CORRECT ANSWER- Documentation The standards that gas cylinders must conform to (Dept. of Transportation) - CORRECT ANSWER- DOT Standards Types of fuses that have one element for overloads and another element for short circuits - CORRECT ANSWER- Dual Element Fuses A particular type of an explosion that does NOT often result in pronounced seats of explosion - CORRECT ANSWER- 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. - CORRECT ANSWER- Dust Explosion 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. - CORRECT ANSWER- Engine Oil Analysis The fire scene itself needs to be considered as WHAT? - CORRECT ANSWER- Evidence The process of photographing an item, then collecting, tagging and putting it in a log - CORRECT ANSWER- Evidence Collection The importance of this fire investigative practice is no different in wildfire investigations, compared to structural fires. - CORRECT ANSWER- Evidence Collection and Documentation 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 - CORRECT ANSWER- Evidence Custodian The justification used to enter a property in order to extinguish a fire - CORRECT ANSWER- Exigent Circumstances
(4th amendment issue) - CORRECT ANSWER- Fire Scene Access Recreating pre-fire positions of contents - CORRECT ANSWER- Fire Scene Reconstruction This type of door must be used when installed in a fire-rated wall. - CORRECT ANSWER- Fire-rated Door This is the typical extent of thermal injuries sustained from an explosion flame front, due to the very short duration. - CORRECT ANSWER- First or Second Degree Burns 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 - CORRECT ANSWER- Flame Spread Rating This type of fuel can only be ignited by a spark or pilot flame over specific ranges of gas concentration - CORRECT ANSWER- Flammable Gases A liquid with a flash point below 100F - CORRECT ANSWER- Flammable Liquid
The characteristic of an appropriate mixture of vapor-to-air, which will cause it to ignite when subjected to an ignition source - CORRECT ANSWER- Flash point A specific fuel characteristic, which will have little or no significance when the fuel is released in a spray form. - CORRECT ANSWER- Flash Point In this phenomenon, the radiant ignition of exposed combustible materials is key - CORRECT ANSWER- Flashover This phenomenon will occur in a compartment with a low ceiling and fire on the floor, before the same fire in a room with high ceilings - CORRECT ANSWER- Flashover This fire phenomenon is not really a consideration for wildfires - CORRECT ANSWER- Flashover These construction features are tested for fire spread from below, but NOT from above - CORRECT ANSWER- Floor Assemblies The two mechanisms of convection heat transfer - CORRECT ANSWER- Forced and Natural This law allows fire investigators to gain information, in most states - CORRECT ANSWER- Freedom of Information Act
The information presented in NFPA 921 establishes WHAT? - CORRECT ANSWER- Guidelines Biological, chemical, physical, and radiological are examples of this concept that fire investigators should be aware of when investigating a fire scene - CORRECT ANSWER- Hazards The first cutting unit on a combine - CORRECT ANSWER- Header The measure of the rate of heat transfer to a surface - CORRECT ANSWER- Heat flux 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) - CORRECT ANSWER- Heat of Combustion The heat energy that brings about ignition (divided into two parts: (a) equipment involved in ignition and (b) form of heat of ignition) - CORRECT ANSWER- Heat of Ignition The fire characteristic that most affects fire growth during the pre-flashover phase of a fire - CORRECT ANSWER- Heat Release Rate
The transport of heat energy from one point to another point, caused by temperature difference between those points - CORRECT ANSWER- Heat transfer The fire phenomenon responsible for much of the physical evidence used by fire investigators - CORRECT ANSWER- Heat transfer The shattering type of explosion damage - CORRECT ANSWER- High-Order Damage The type of number an investigator should look for during a boat fire investigation
- CORRECT ANSWER- H.I.N. This vehicle component will NOT usually ignite gasoline - CORRECT ANSWER- Hot Surfaces Component of the human body that will act as a fuel and sustain a flame - CORRECT ANSWER- Human Body Fat Any substance that will spontaneously ignite or explode upon exposure to an oxidizer. - CORRECT ANSWER- Hypergolic Material Materials that can react with each other - CORRECT ANSWER- Hypergolic Materials
The reasoning process of moving from specific observation to broader generalizations (*Induction is to "increase" *Develop hypothesis ("induce") *More uncertain than deduction *Based on empirical data, training, and experience) - CORRECT ANSWER- Inductive Reasoning Any person, entity, or organization with obligations or whose rights or interest might be affected by the investigation of a specific incident - CORRECT ANSWER- Interested Party (1) Trust, (2) Caution, and (3) Distrust are three types of what? - CORRECT ANSWER- Interviews This fire pattern is often caused by a natural gas leak - CORRECT ANSWER- Inverted Cone Pattern Fire patterns commonly created when a vertical flame plume does not reach the ceiling - CORRECT ANSWER- Inverted Cone Patterns In what group is one representative selected from each investigative party? - CORRECT ANSWER- Team Leader Committee
A certain pattern that is not necessarily an indicator of the presence of an ignitable liquid - CORRECT ANSWER- Irregular Pattern A professional description that (1) describes the specific job task, (2) lists items necessary to complete the task, and (3) describes measurable outcomes and evaluations for the task - CORRECT ANSWER- Job Performance Requirement These can occur simultaneously and involve separate and independent examinations through which each party may develop an independent hypothesis - CORRECT ANSWER- Joint Investigations Which of these fuels has the lowest ignition temperature: kerosene, gasoline, methane, or propane? - CORRECT ANSWER- Kerosene The type of energy that is converted suddenly from potential energy during an explosion, with the production and release of gases under pressure. - CORRECT ANSWER- Kinetic Energy This entity must confirm any sample obtained by canine alert, to be considered valid - CORRECT ANSWER- Laboratory Analysis One of the most dangerous situations an investigator may encounter when examining a boat afloat after a fire - CORRECT ANSWER- Lack of Stability
