IAAI CFI ACtuAl ExAm – IntErnAtIonAl AssoCIAtIon oF Arson
InvEstIgAtors (IAAI) – 2026/2027 ACAdEmIC YEAr – vErIFIEd
QuEstIons And AnswEIAAI CFI ACtuAl ExAm – IntErnAtIonAl
AssoCIAtIon oF Arson InvEstIgAtors (IAAI) – 2026/2027
ACAdEmIC YEAr – vErIFIEd QuEstIons And AnswErs
This comprehensive practice exam contains 100 questions designed to reinforce the
official IAAI Certified Fire Investigator (CFI) certification objectives for the 2026/2027
curriculum. The exam is based on NFPA 921: Guide for Fire and Explosion
Investigations and NFPA 1033: Standard for Professional Qualifications for Fire
Investigator.
DOMAIN I: FIRE DYNAMICS AND BEHAVIOR
Question 1
What is the definition of combustion?
• A) A chemical process of oxidation that occurs at a rate slow enough to produce heat
and light
• B) A chemical process of oxidation that occurs at a rate fast enough to produce heat and
usually light in the form of either a glow or a flame
• C) A physical change in matter that produces heat
• D) The process of burning without oxygen
AnswEr: B – A chemical process of oxidation that occurs at a rate fast enough to produce
heat and usually light in the form of either a glow or a flame
rAtIonAlE: Combustion is defined as a chemical process of oxidation that occurs at a rate
fast enough to produce heat and usually light in the form of either a glow or a flame. It is an
exothermic reaction that requires fuel, oxygen, and an ignition source—often referred to as the
fire triangle. Option A describes slower oxidation (like rusting), which does not produce flame.
Option C incorrectly describes a physical change, and Option D describes pyrolysis, not
combustion.
,Question 2
What temperature in the upper gas layer causes the onset of flashover?
• A) 900°F
• B) 1,100°F
• C) 1,500°F
• D) 2,000°F
AnswEr: B – 1,100°F
rAtIonAlE: The onset of flashover occurs when the upper gas layer temperature reaches
approximately 1,100°F (593°C). At this point, radiant heat flux to the floor reaches about 2
W/cm², causing simultaneous ignition of all combustible materials in the compartment.
Flashover represents the transition from a growing fire to a fully developed fire.
Question 3
What is the critical radiant heat flux threshold for the onset of flashover?
• A) 1 W/cm²
• B) 2 W/cm²
• C) 5 W/cm²
• D) 10 W/cm²
AnswEr: B – 2 W/cm²
rAtIonAlE: A heat flux of approximately 2 W/cm² is the critical threshold for the onset of
flashover. At this level, radiant heat from the upper gas layer is sufficient to ignite all
combustibles in the compartment simultaneously. This phenomenon is a key indicator of
flashover conditions.
Question 4
A meaningful analysis of a fire requires an understanding of the fire growth, the total heat
released, and what additional parameter?
• A) Smoke color
• B) Heat Release Rate
, • C) Flame height
• D) Wind speed
AnswEr: B – Heat Release Rate
rAtIonAlE: A meaningful fire analysis requires understanding fire growth, total heat
released, and Heat Release Rate (HRR). HRR is the rate at which energy is released by a fire
and is fundamental to understanding fire growth dynamics. It is measured in kilowatts (kW).
Smoke color, flame height, and wind speed are secondary considerations.
Question 5
What is the flash point of a liquid?
• A) The temperature at which a liquid spontaneously ignites without an ignition source
• B) The lowest temperature at which a liquid produces enough vapor to ignite
momentarily in the presence of an ignition source but does not sustain combustion
• C) The temperature at which a liquid continues to burn after ignition
• D) The temperature at which a liquid boils
AnswEr: B – The lowest temperature at which a liquid produces enough vapor to ignite
momentarily in the presence of an ignition source but does not sustain combustion
rAtIonAlE: The flash point is the minimum temperature at which a liquid gives off
sufficient vapor to form an ignitable mixture with air near the surface. At this temperature,
the vapor will ignite momentarily in the presence of an ignition source but will not sustain
combustion. The fire point is the temperature at which combustion is sustained.
Question 6
A liquid with a flash point above 100°F is classified as:
• A) Flammable liquid
• B) Combustible liquid
• C) Volatile liquid
• D) Hazardous liquid
AnswEr: B – Combustible liquid
, rAtIonAlE: A combustible liquid is defined as having a flash point above 100°F. Flammable
liquids have flash points below 100°F. This distinction is important in fire investigation for
determining the behavior of fuels and potential ignition sources.
Question 7
What is the melting temperature of aluminum?
• A) 1,220°F
• B) 1,500°F
• C) 1,700°F
• D) 2,000°F
AnswEr: A – 1,220°F
rAtIonAlE: The melting temperature of aluminum is approximately 1,220°F. This is important
in fire investigations because aluminum components (such as electrical wiring or structural
elements) can melt at this temperature, providing evidence of fire temperatures. Copper melts at
approximately 1,980°F, and steel at approximately 2,500°F.
Question 8
A deflagration resulting from the sudden introduction of air into a confined space
containing oxygen-deficient products of incomplete combustion is called:
• A) Flashover
• B) Backdraft
• C) BLEVE
• D) Auto-ignition
AnswEr: B – Backdraft
rAtIonAlE: A backdraft is a deflagration resulting from the sudden introduction of air into
a confined space containing oxygen-deficient products of incomplete combustion. This
explosive event occurs when a fire in a sealed compartment consumes available oxygen, and the
sudden influx of oxygen (e.g., opening a door) causes rapid combustion of accumulated gases.
Flashover (A) involves simultaneous ignition of all combustibles in a compartment. BLEVE (C)
involves boiling liquid expanding vapor. Auto-ignition (D) is spontaneous ignition without an
external source.
InvEstIgAtors (IAAI) – 2026/2027 ACAdEmIC YEAr – vErIFIEd
QuEstIons And AnswEIAAI CFI ACtuAl ExAm – IntErnAtIonAl
AssoCIAtIon oF Arson InvEstIgAtors (IAAI) – 2026/2027
ACAdEmIC YEAr – vErIFIEd QuEstIons And AnswErs
This comprehensive practice exam contains 100 questions designed to reinforce the
official IAAI Certified Fire Investigator (CFI) certification objectives for the 2026/2027
curriculum. The exam is based on NFPA 921: Guide for Fire and Explosion
Investigations and NFPA 1033: Standard for Professional Qualifications for Fire
Investigator.
DOMAIN I: FIRE DYNAMICS AND BEHAVIOR
Question 1
What is the definition of combustion?
• A) A chemical process of oxidation that occurs at a rate slow enough to produce heat
and light
• B) A chemical process of oxidation that occurs at a rate fast enough to produce heat and
usually light in the form of either a glow or a flame
• C) A physical change in matter that produces heat
• D) The process of burning without oxygen
AnswEr: B – A chemical process of oxidation that occurs at a rate fast enough to produce
heat and usually light in the form of either a glow or a flame
rAtIonAlE: Combustion is defined as a chemical process of oxidation that occurs at a rate
fast enough to produce heat and usually light in the form of either a glow or a flame. It is an
exothermic reaction that requires fuel, oxygen, and an ignition source—often referred to as the
fire triangle. Option A describes slower oxidation (like rusting), which does not produce flame.
Option C incorrectly describes a physical change, and Option D describes pyrolysis, not
combustion.
,Question 2
What temperature in the upper gas layer causes the onset of flashover?
• A) 900°F
• B) 1,100°F
• C) 1,500°F
• D) 2,000°F
AnswEr: B – 1,100°F
rAtIonAlE: The onset of flashover occurs when the upper gas layer temperature reaches
approximately 1,100°F (593°C). At this point, radiant heat flux to the floor reaches about 2
W/cm², causing simultaneous ignition of all combustible materials in the compartment.
Flashover represents the transition from a growing fire to a fully developed fire.
Question 3
What is the critical radiant heat flux threshold for the onset of flashover?
• A) 1 W/cm²
• B) 2 W/cm²
• C) 5 W/cm²
• D) 10 W/cm²
AnswEr: B – 2 W/cm²
rAtIonAlE: A heat flux of approximately 2 W/cm² is the critical threshold for the onset of
flashover. At this level, radiant heat from the upper gas layer is sufficient to ignite all
combustibles in the compartment simultaneously. This phenomenon is a key indicator of
flashover conditions.
Question 4
A meaningful analysis of a fire requires an understanding of the fire growth, the total heat
released, and what additional parameter?
• A) Smoke color
• B) Heat Release Rate
, • C) Flame height
• D) Wind speed
AnswEr: B – Heat Release Rate
rAtIonAlE: A meaningful fire analysis requires understanding fire growth, total heat
released, and Heat Release Rate (HRR). HRR is the rate at which energy is released by a fire
and is fundamental to understanding fire growth dynamics. It is measured in kilowatts (kW).
Smoke color, flame height, and wind speed are secondary considerations.
Question 5
What is the flash point of a liquid?
• A) The temperature at which a liquid spontaneously ignites without an ignition source
• B) The lowest temperature at which a liquid produces enough vapor to ignite
momentarily in the presence of an ignition source but does not sustain combustion
• C) The temperature at which a liquid continues to burn after ignition
• D) The temperature at which a liquid boils
AnswEr: B – The lowest temperature at which a liquid produces enough vapor to ignite
momentarily in the presence of an ignition source but does not sustain combustion
rAtIonAlE: The flash point is the minimum temperature at which a liquid gives off
sufficient vapor to form an ignitable mixture with air near the surface. At this temperature,
the vapor will ignite momentarily in the presence of an ignition source but will not sustain
combustion. The fire point is the temperature at which combustion is sustained.
Question 6
A liquid with a flash point above 100°F is classified as:
• A) Flammable liquid
• B) Combustible liquid
• C) Volatile liquid
• D) Hazardous liquid
AnswEr: B – Combustible liquid
, rAtIonAlE: A combustible liquid is defined as having a flash point above 100°F. Flammable
liquids have flash points below 100°F. This distinction is important in fire investigation for
determining the behavior of fuels and potential ignition sources.
Question 7
What is the melting temperature of aluminum?
• A) 1,220°F
• B) 1,500°F
• C) 1,700°F
• D) 2,000°F
AnswEr: A – 1,220°F
rAtIonAlE: The melting temperature of aluminum is approximately 1,220°F. This is important
in fire investigations because aluminum components (such as electrical wiring or structural
elements) can melt at this temperature, providing evidence of fire temperatures. Copper melts at
approximately 1,980°F, and steel at approximately 2,500°F.
Question 8
A deflagration resulting from the sudden introduction of air into a confined space
containing oxygen-deficient products of incomplete combustion is called:
• A) Flashover
• B) Backdraft
• C) BLEVE
• D) Auto-ignition
AnswEr: B – Backdraft
rAtIonAlE: A backdraft is a deflagration resulting from the sudden introduction of air into
a confined space containing oxygen-deficient products of incomplete combustion. This
explosive event occurs when a fire in a sealed compartment consumes available oxygen, and the
sudden influx of oxygen (e.g., opening a door) causes rapid combustion of accumulated gases.
Flashover (A) involves simultaneous ignition of all combustibles in a compartment. BLEVE (C)
involves boiling liquid expanding vapor. Auto-ignition (D) is spontaneous ignition without an
external source.
