IAAI CFI Actual Exam 2026/2027 |
Verified Questions
International Association of Arson Investigators (IAAI) | Verified Q&A | Professional
Fire Investigation Candidates
This comprehensive actual exam set contains exactly 100 items constructed to reinforce the official IAAI
CFI certification objectives for the 2026/2027 curriculum. The content is organized across four domains:
Fire Science and Behavior, Origin and Cause Determination, Evidence Collection and Preservation, and
Legal Aspects and Report Writing in Fire Investigation. Each domain contains 25 questions drawn from
distinct sub-topics, so every item evaluates a separate body of knowledge with no duplication across the
examination. The items are designed for Professional Fire Investigation and Certification Candidates who
are working toward the actual exam, and each question is paired with a rationale grounded in the official
IAAI CFI examination blueprint, current NFPA 921 and NFPA 1033 standards, and evidence-based fire
investigation practices. Working through all 100 questions will reinforce systematic scene examination,
fire behavior analysis, evidence handling, and professional reporting skills required for certification and
actual exam readiness.
Domain: Fire Science and Behavior
1. Which four elements are necessary for a fire to occur?
A. Fuel, pressure, moisture, and gravity.
B. Fuel, oxygen, water, and carbon dioxide.
C. Heat, light, sound, and smoke.
D. Fuel, heat, an oxidizing agent, and an uninhibited chemical chain reaction.
Correct Answer: D
Rationale: The fire tetrahedron consists of fuel, heat, an oxidizing agent, and an uninhibited
chemical chain reaction. Removing any side stops the fire, a foundational concept in NFPA 921.
2. Which term describes the lowest temperature at which a liquid gives off enough vapor to
form an ignitable mixture near its surface?
A. Autoignition temperature.
B. Flash point.
C. Fire point.
D. Boiling point.
Correct Answer: B
Rationale: Flash point is the lowest temperature at which a liquid emits sufficient vapor to form
an ignitable mixture with air. This is a key property used to classify ignitable liquids.
3. Which term describes the lowest temperature at which a fuel will spontaneously ignite
without an external ignition source?
A. Smoldering temperature.
B. Autoignition temperature.
C. Flash point.
D. Fire point.
Correct Answer: B
IAAI CFI Actual Exam 2026/2027 | Verified Questions
, Rationale: Autoignition temperature is the lowest temperature at which a material will ignite
spontaneously without an external flame or spark. This is important in determining potential
ignition sources.
4. Which term refers to the minimum concentration of a gas or vapor in air that will
support combustion?
A. Lower flammable limit.
B. Upper flammable limit.
C. Vapor density.
D. Flash point.
Correct Answer: A
Rationale: The lower flammable limit is the minimum concentration of a gas or vapor in air that
will ignite. Concentrations below this limit are too lean to burn.
5. In which phase of fire development do temperatures rise rapidly and flames begin to roll
across the ceiling?
A. Decay.
B. Ignition.
C. Flashover.
D. Smoldering.
Correct Answer: C
Rationale: Flashover is the rapid transition from a growing fire to a fully developed fire, marked
by a sudden rise in temperature and flames across the ceiling. Recognizing it is central to NFPA
921.
6. Which type of heat transfer occurs when heat is transferred through a solid material?
A. Radiation.
B. Convection.
C. Insulation.
D. Conduction.
Correct Answer: D
Rationale: Conduction is the transfer of heat through a solid material. It explains how fire spreads
through structural elements such as pipes and beams.
7. Which type of heat transfer moves heat through the movement of heated gases and
fluids?
A. Conduction.
B. Sublimation.
C. Convection.
D. Radiation.
Correct Answer: C
Rationale: Convection transfers heat through the movement of heated gases or fluids, such as the
hot gases rising in a plume. It is a major mechanism of fire spread.
8. Which type of heat transfer travels through electromagnetic waves and does not require
a medium?
A. Conduction.
B. Radiation.
C. Osmosis.
D. Convection.
Correct Answer: B
Rationale: Radiation transfers heat through electromagnetic waves and can spread fire to nearby
surfaces without contact. It is a key fire spread mechanism.
IAAI CFI Actual Exam 2026/2027 | Verified Questions
, 9. Which classification of fire involves ordinary combustibles such as wood, paper, and
cloth?
A. Class C.
B. Class D.
C. Class B.
D. Class A.
Correct Answer: D
Rationale: Class A fires involve ordinary combustibles such as wood, paper, and cloth. The NFPA
fire classification system categorizes fuels by class.
10. Which classification of fire involves flammable liquids and gases?
A. Class D.
B. Class C.
C. Class A.
D. Class B.
Correct Answer: D
Rationale: Class B fires involve flammable liquids, such as gasoline and oil, and flammable gases.
This classification guides appropriate suppression and investigation.
11. Which classification of fire involves energized electrical equipment?
A. Class C.
B. Class A.
C. Class B.
D. Class D.
Correct Answer: A
Rationale: Class C fires involve energized electrical equipment. Understanding this classification is
important for safe handling during an investigation.
12. Which classification of fire involves combustible metals such as magnesium and
titanium?
A. Class C.
B. Class D.
C. Class A.
D. Class B.
Correct Answer: B
Rationale: Class D fires involve combustible metals such as magnesium, titanium, and sodium.
These require special suppression methods.
13. Which term describes the gaseous decomposition product produced when a material is
heated without full combustion?
A. Reduction.
B. Pyrolysis.
C. Oxidation.
D. Condensation.
Correct Answer: B
Rationale: Pyrolysis is the thermal decomposition of a material into volatile products when
heated. It provides fuel for combustion and is central to fire science.
14. Which term describes the burning of a material at a temperature below its ignition
point with no flame?
A. Smoldering.
B. Rollover.
C. Flashover.
IAAI CFI Actual Exam 2026/2027 | Verified Questions
Verified Questions
International Association of Arson Investigators (IAAI) | Verified Q&A | Professional
Fire Investigation Candidates
This comprehensive actual exam set contains exactly 100 items constructed to reinforce the official IAAI
CFI certification objectives for the 2026/2027 curriculum. The content is organized across four domains:
Fire Science and Behavior, Origin and Cause Determination, Evidence Collection and Preservation, and
Legal Aspects and Report Writing in Fire Investigation. Each domain contains 25 questions drawn from
distinct sub-topics, so every item evaluates a separate body of knowledge with no duplication across the
examination. The items are designed for Professional Fire Investigation and Certification Candidates who
are working toward the actual exam, and each question is paired with a rationale grounded in the official
IAAI CFI examination blueprint, current NFPA 921 and NFPA 1033 standards, and evidence-based fire
investigation practices. Working through all 100 questions will reinforce systematic scene examination,
fire behavior analysis, evidence handling, and professional reporting skills required for certification and
actual exam readiness.
Domain: Fire Science and Behavior
1. Which four elements are necessary for a fire to occur?
A. Fuel, pressure, moisture, and gravity.
B. Fuel, oxygen, water, and carbon dioxide.
C. Heat, light, sound, and smoke.
D. Fuel, heat, an oxidizing agent, and an uninhibited chemical chain reaction.
Correct Answer: D
Rationale: The fire tetrahedron consists of fuel, heat, an oxidizing agent, and an uninhibited
chemical chain reaction. Removing any side stops the fire, a foundational concept in NFPA 921.
2. Which term describes the lowest temperature at which a liquid gives off enough vapor to
form an ignitable mixture near its surface?
A. Autoignition temperature.
B. Flash point.
C. Fire point.
D. Boiling point.
Correct Answer: B
Rationale: Flash point is the lowest temperature at which a liquid emits sufficient vapor to form
an ignitable mixture with air. This is a key property used to classify ignitable liquids.
3. Which term describes the lowest temperature at which a fuel will spontaneously ignite
without an external ignition source?
A. Smoldering temperature.
B. Autoignition temperature.
C. Flash point.
D. Fire point.
Correct Answer: B
IAAI CFI Actual Exam 2026/2027 | Verified Questions
, Rationale: Autoignition temperature is the lowest temperature at which a material will ignite
spontaneously without an external flame or spark. This is important in determining potential
ignition sources.
4. Which term refers to the minimum concentration of a gas or vapor in air that will
support combustion?
A. Lower flammable limit.
B. Upper flammable limit.
C. Vapor density.
D. Flash point.
Correct Answer: A
Rationale: The lower flammable limit is the minimum concentration of a gas or vapor in air that
will ignite. Concentrations below this limit are too lean to burn.
5. In which phase of fire development do temperatures rise rapidly and flames begin to roll
across the ceiling?
A. Decay.
B. Ignition.
C. Flashover.
D. Smoldering.
Correct Answer: C
Rationale: Flashover is the rapid transition from a growing fire to a fully developed fire, marked
by a sudden rise in temperature and flames across the ceiling. Recognizing it is central to NFPA
921.
6. Which type of heat transfer occurs when heat is transferred through a solid material?
A. Radiation.
B. Convection.
C. Insulation.
D. Conduction.
Correct Answer: D
Rationale: Conduction is the transfer of heat through a solid material. It explains how fire spreads
through structural elements such as pipes and beams.
7. Which type of heat transfer moves heat through the movement of heated gases and
fluids?
A. Conduction.
B. Sublimation.
C. Convection.
D. Radiation.
Correct Answer: C
Rationale: Convection transfers heat through the movement of heated gases or fluids, such as the
hot gases rising in a plume. It is a major mechanism of fire spread.
8. Which type of heat transfer travels through electromagnetic waves and does not require
a medium?
A. Conduction.
B. Radiation.
C. Osmosis.
D. Convection.
Correct Answer: B
Rationale: Radiation transfers heat through electromagnetic waves and can spread fire to nearby
surfaces without contact. It is a key fire spread mechanism.
IAAI CFI Actual Exam 2026/2027 | Verified Questions
, 9. Which classification of fire involves ordinary combustibles such as wood, paper, and
cloth?
A. Class C.
B. Class D.
C. Class B.
D. Class A.
Correct Answer: D
Rationale: Class A fires involve ordinary combustibles such as wood, paper, and cloth. The NFPA
fire classification system categorizes fuels by class.
10. Which classification of fire involves flammable liquids and gases?
A. Class D.
B. Class C.
C. Class A.
D. Class B.
Correct Answer: D
Rationale: Class B fires involve flammable liquids, such as gasoline and oil, and flammable gases.
This classification guides appropriate suppression and investigation.
11. Which classification of fire involves energized electrical equipment?
A. Class C.
B. Class A.
C. Class B.
D. Class D.
Correct Answer: A
Rationale: Class C fires involve energized electrical equipment. Understanding this classification is
important for safe handling during an investigation.
12. Which classification of fire involves combustible metals such as magnesium and
titanium?
A. Class C.
B. Class D.
C. Class A.
D. Class B.
Correct Answer: B
Rationale: Class D fires involve combustible metals such as magnesium, titanium, and sodium.
These require special suppression methods.
13. Which term describes the gaseous decomposition product produced when a material is
heated without full combustion?
A. Reduction.
B. Pyrolysis.
C. Oxidation.
D. Condensation.
Correct Answer: B
Rationale: Pyrolysis is the thermal decomposition of a material into volatile products when
heated. It provides fuel for combustion and is central to fire science.
14. Which term describes the burning of a material at a temperature below its ignition
point with no flame?
A. Smoldering.
B. Rollover.
C. Flashover.
IAAI CFI Actual Exam 2026/2027 | Verified Questions
