IAAI CFI EXAM WITH QUESTIONS AND
ANSWERS WITH RATIONALES
Question 1
The ratio of the density of a substance to the density of a standard (usually water for a
liquid or solid, and air for a gas)
Correct Answer
Specific Gravity
Question 2
The process of photographing an item, then collecting, tagging and putting it in a log
Correct Answer
Evidence Collection
Question 3
The two basic types of fire patterns
Correct Answer
Movement and Intensity
Question 4
(1) Trust, (2) Caution, and (3) Distrust are three types of what?
Correct Answer
Interviews
Page 1 of 132
,Question 5
The melting temperature of aluminum
Correct Answer
1220°F
Question 1: According to NFPA 921, what is the primary purpose of a
systematic fire investigation?
A. To determine insurance coverage limits
B. To establish the origin and cause of the fire
C. To assign criminal liability immediately
D. To document only the most damaged areas
CORRECT ANSWER: B. To establish the origin and cause of the fire
Rationale: NFPA 921 emphasizes that the fundamental goal of a fire investigation is
to determine the origin and cause through a systematic, scientific approach. This
process forms the foundation for all subsequent analyses, including whether the fire
was accidental, natural, or intentional.
Question 2: Which of the following best describes the “V” pattern commonly
observed in fire scenes?
A. A pattern indicating the fire started at the ceiling and burned downward
B. A pattern formed by the upward and outward movement of flames and hot gases
from a point of origin
C. A pattern created solely by liquid accelerants
D. A pattern that only appears in structural fires involving electrical sources
CORRECT ANSWER: B. A pattern formed by the upward and outward
movement of flames and hot gases from a point of origin
Rationale: The classic “V” pattern results from the natural convection and radiation
of heat and flame from a localized origin, spreading upward and outward. While
modified by fuels and ventilation, it remains a key indicator used in origin
determination.
Question 3: In fire investigation, the term “flashover” refers to which
phenomenon?
Page 2 of 132
,A. The spontaneous ignition of all combustible materials in a compartment due to
radiant heat
B. The initial ignition of a small fuel package
C. The cooling phase after suppression
D. The explosion of a pressurized container
CORRECT ANSWER: A. The spontaneous ignition of all combustible materials
in a compartment due to radiant heat
Rationale: Flashover occurs when the upper layer of hot gases radiates sufficient
heat to ignite all exposed combustible surfaces nearly simultaneously, transitioning
the fire from a localized to a fully developed compartment fire.
Question 4: Which of the following is considered the most reliable indicator of
the area of origin in a fully developed compartment fire?
A. The area of deepest char
B. The location of the most severe structural damage combined with burn patterns
and witness information
C. The position of the fire extinguisher
D. The color of the smoke observed by first responders
CORRECT ANSWER: B. The location of the most severe structural damage
combined with burn patterns and witness information
Rationale: No single indicator is definitive. Investigators must evaluate the totality of
physical evidence, burn patterns, fire dynamics, and reliable witness statements to
determine the area of origin with the highest degree of certainty.
Question 5: According to accepted fire investigation methodology, when
should the investigator begin documenting the scene?
A. Only after the fire is fully extinguished and the scene is released by the fire
department
B. As soon as practical upon arrival, beginning with exterior observations and
progressing inward
C. After collecting all physical evidence
D. Only when a suspected accelerant is found
Page 3 of 132
, CORRECT ANSWER: B. As soon as practical upon arrival, beginning with
exterior observations and progressing inward
Rationale: Early and continuous documentation preserves the condition of the
scene, records transient evidence such as smoke and flame patterns, and supports
the systematic examination process recommended by NFPA 921.
Question 6: What is the primary chemical process occurring during flaming
combustion?
A. Oxidation of fuel vapor in the gas phase producing heat and light
B. Direct solid-phase reaction between fuel and oxygen
C. Endothermic decomposition without oxygen
D. Condensation of water vapor on cool surfaces
CORRECT ANSWER: A. Oxidation of fuel vapor in the gas phase producing heat
and light
Rationale: Flaming combustion requires the fuel to first vaporize or pyrolyze; the
resulting vapors then mix with oxygen and react in the gas phase, releasing energy
as heat and visible light.
Question 7: Which of the following is NOT a recognized classification of fire
cause under NFPA 921?
A. Accidental
B. Natural
C. Incendiary
D. Undetermined
E. Intentional only
CORRECT ANSWER: E. Intentional only
Rationale: NFPA 921 classifies fire causes as accidental, natural, incendiary, or
undetermined. “Intentional only” is not a recognized category; incendiary fires are
those intentionally set under circumstances where the person knows the fire should
not be ignited.
Question 8: In electrical fire investigation, what does “arc mapping” primarily
help determine?
Page 4 of 132
ANSWERS WITH RATIONALES
Question 1
The ratio of the density of a substance to the density of a standard (usually water for a
liquid or solid, and air for a gas)
Correct Answer
Specific Gravity
Question 2
The process of photographing an item, then collecting, tagging and putting it in a log
Correct Answer
Evidence Collection
Question 3
The two basic types of fire patterns
Correct Answer
Movement and Intensity
Question 4
(1) Trust, (2) Caution, and (3) Distrust are three types of what?
Correct Answer
Interviews
Page 1 of 132
,Question 5
The melting temperature of aluminum
Correct Answer
1220°F
Question 1: According to NFPA 921, what is the primary purpose of a
systematic fire investigation?
A. To determine insurance coverage limits
B. To establish the origin and cause of the fire
C. To assign criminal liability immediately
D. To document only the most damaged areas
CORRECT ANSWER: B. To establish the origin and cause of the fire
Rationale: NFPA 921 emphasizes that the fundamental goal of a fire investigation is
to determine the origin and cause through a systematic, scientific approach. This
process forms the foundation for all subsequent analyses, including whether the fire
was accidental, natural, or intentional.
Question 2: Which of the following best describes the “V” pattern commonly
observed in fire scenes?
A. A pattern indicating the fire started at the ceiling and burned downward
B. A pattern formed by the upward and outward movement of flames and hot gases
from a point of origin
C. A pattern created solely by liquid accelerants
D. A pattern that only appears in structural fires involving electrical sources
CORRECT ANSWER: B. A pattern formed by the upward and outward
movement of flames and hot gases from a point of origin
Rationale: The classic “V” pattern results from the natural convection and radiation
of heat and flame from a localized origin, spreading upward and outward. While
modified by fuels and ventilation, it remains a key indicator used in origin
determination.
Question 3: In fire investigation, the term “flashover” refers to which
phenomenon?
Page 2 of 132
,A. The spontaneous ignition of all combustible materials in a compartment due to
radiant heat
B. The initial ignition of a small fuel package
C. The cooling phase after suppression
D. The explosion of a pressurized container
CORRECT ANSWER: A. The spontaneous ignition of all combustible materials
in a compartment due to radiant heat
Rationale: Flashover occurs when the upper layer of hot gases radiates sufficient
heat to ignite all exposed combustible surfaces nearly simultaneously, transitioning
the fire from a localized to a fully developed compartment fire.
Question 4: Which of the following is considered the most reliable indicator of
the area of origin in a fully developed compartment fire?
A. The area of deepest char
B. The location of the most severe structural damage combined with burn patterns
and witness information
C. The position of the fire extinguisher
D. The color of the smoke observed by first responders
CORRECT ANSWER: B. The location of the most severe structural damage
combined with burn patterns and witness information
Rationale: No single indicator is definitive. Investigators must evaluate the totality of
physical evidence, burn patterns, fire dynamics, and reliable witness statements to
determine the area of origin with the highest degree of certainty.
Question 5: According to accepted fire investigation methodology, when
should the investigator begin documenting the scene?
A. Only after the fire is fully extinguished and the scene is released by the fire
department
B. As soon as practical upon arrival, beginning with exterior observations and
progressing inward
C. After collecting all physical evidence
D. Only when a suspected accelerant is found
Page 3 of 132
, CORRECT ANSWER: B. As soon as practical upon arrival, beginning with
exterior observations and progressing inward
Rationale: Early and continuous documentation preserves the condition of the
scene, records transient evidence such as smoke and flame patterns, and supports
the systematic examination process recommended by NFPA 921.
Question 6: What is the primary chemical process occurring during flaming
combustion?
A. Oxidation of fuel vapor in the gas phase producing heat and light
B. Direct solid-phase reaction between fuel and oxygen
C. Endothermic decomposition without oxygen
D. Condensation of water vapor on cool surfaces
CORRECT ANSWER: A. Oxidation of fuel vapor in the gas phase producing heat
and light
Rationale: Flaming combustion requires the fuel to first vaporize or pyrolyze; the
resulting vapors then mix with oxygen and react in the gas phase, releasing energy
as heat and visible light.
Question 7: Which of the following is NOT a recognized classification of fire
cause under NFPA 921?
A. Accidental
B. Natural
C. Incendiary
D. Undetermined
E. Intentional only
CORRECT ANSWER: E. Intentional only
Rationale: NFPA 921 classifies fire causes as accidental, natural, incendiary, or
undetermined. “Intentional only” is not a recognized category; incendiary fires are
those intentionally set under circumstances where the person knows the fire should
not be ignited.
Question 8: In electrical fire investigation, what does “arc mapping” primarily
help determine?
Page 4 of 132
