NAFI CFEI Fire Investigation Exam 2026 Certified Fire & Explosion
Investigator Practice Questions & Verified Answers.
Fire Science & Chemistry (15%)
Fire Scene Investigation Methodology (25%)
Fire Patterns & Damage Analysis (20%)
Evidence Collection & Preservation (15%)
Origin & Cause Determination (15%)
Legal & Professional Responsibilities (10%)
SECTION 1: FIRE SCIENCE & CHEMISTRY (Questions 1–25)
Question 1
The fire tetrahedron consists of which four elements?
,A) Fuel, oxygen, heat, and carbon dioxide
B) Fuel, oxygen, heat, and an uninhibited chemical chain reaction
C) Fuel, oxygen, ignition source, and water
D) Fuel, heat, light, and smoke
Answer: B
Rationale: The fire tetrahedron includes fuel, oxygen, heat, and the chemical
chain reaction. Removal of any one element prevents sustained combustion. This
expands on the original fire triangle .
Question 2
The process by which a solid fuel is converted to a flammable gas is called:
A) Sublimation
B) Pyrolysis
C) Vaporization
D) Oxidation
Answer: B
,Rationale: Pyrolysis is the chemical decomposition of a solid material by heat,
producing flammable gases that can then combust. This is a key concept in
understanding how solid fuels contribute to fire growth .
Question 3
The lowest temperature at which a liquid produces enough vapor to momentarily
ignite (flash) when an ignition source is introduced is the:
A) Fire point
B) Autoignition temperature
C) Flash point
D) Boiling point
Answer: C
Rationale: Flash point is the lowest temperature for momentary ignition, while
fire point is the temperature for sustained combustion .
Question 4
Which mode of heat transfer involves the movement of hot gases or liquids?
, A) Conduction
B) Convection
C) Radiation
D) Pyrolysis
Answer: B
Rationale: Convection transfers heat through the movement of fluids (gases or
liquids). In fires, hot gases rise and transfer heat to upper surfaces and ceiling
layers .
Question 5
The temperature at which a material self-ignites without an external ignition
source is the:
A) Flash point
B) Fire point
C) Autoignition temperature
D) Pyrolysis point
Answer: C
Investigator Practice Questions & Verified Answers.
Fire Science & Chemistry (15%)
Fire Scene Investigation Methodology (25%)
Fire Patterns & Damage Analysis (20%)
Evidence Collection & Preservation (15%)
Origin & Cause Determination (15%)
Legal & Professional Responsibilities (10%)
SECTION 1: FIRE SCIENCE & CHEMISTRY (Questions 1–25)
Question 1
The fire tetrahedron consists of which four elements?
,A) Fuel, oxygen, heat, and carbon dioxide
B) Fuel, oxygen, heat, and an uninhibited chemical chain reaction
C) Fuel, oxygen, ignition source, and water
D) Fuel, heat, light, and smoke
Answer: B
Rationale: The fire tetrahedron includes fuel, oxygen, heat, and the chemical
chain reaction. Removal of any one element prevents sustained combustion. This
expands on the original fire triangle .
Question 2
The process by which a solid fuel is converted to a flammable gas is called:
A) Sublimation
B) Pyrolysis
C) Vaporization
D) Oxidation
Answer: B
,Rationale: Pyrolysis is the chemical decomposition of a solid material by heat,
producing flammable gases that can then combust. This is a key concept in
understanding how solid fuels contribute to fire growth .
Question 3
The lowest temperature at which a liquid produces enough vapor to momentarily
ignite (flash) when an ignition source is introduced is the:
A) Fire point
B) Autoignition temperature
C) Flash point
D) Boiling point
Answer: C
Rationale: Flash point is the lowest temperature for momentary ignition, while
fire point is the temperature for sustained combustion .
Question 4
Which mode of heat transfer involves the movement of hot gases or liquids?
, A) Conduction
B) Convection
C) Radiation
D) Pyrolysis
Answer: B
Rationale: Convection transfers heat through the movement of fluids (gases or
liquids). In fires, hot gases rise and transfer heat to upper surfaces and ceiling
layers .
Question 5
The temperature at which a material self-ignites without an external ignition
source is the:
A) Flash point
B) Fire point
C) Autoignition temperature
D) Pyrolysis point
Answer: C
