IAAI-CFI STYLE PRACTICE EXAM – FULL QUESTIONS
1. Which of the following best defines "fire behavior" as used in fire investigation?
A) The physical and chemical changes occurring during combustion
B) The manner in which a fire reacts to its environment
C) The study of fire patterns left on surfaces
D) The legal classification of fire cause
Answer: B
2. According to NFPA 921, which of the following is the FIRST step in the scientific
method for fire investigation?
A) Collect data
B) Develop a hypothesis
C) Recognize the need
D) Test the hypothesis
Answer: C (Recognize the need is the first step—identifying that a fire occurred and
investigation is required.)
3. The "buoyancy" of fire gases is primarily due to:
A) Their higher density compared to air
B) Their lower density compared to air
C) Their chemical composition
D) The color of the smoke
Answer: B (Hot gases are less dense than air and rise due to buoyancy.)
4. Which type of fire pattern is characterized by a sharp, distinct line between
burned and unburned surfaces?
A) Shadow pattern
B) Protected area pattern
C) Clean burn pattern
,D) Alligatoring pattern
Answer: C (A clean burn has a distinct demarcation line where the fire's heat removed
soot or char.)
5. The term "heat of vaporization" refers to:
A) The heat required to raise a liquid's temperature
B) The heat required to convert a liquid to a vapor
C) The heat released during combustion
D) The heat required to ignite a solid
Answer: B
6. In a compartment fire, the "neutral plane" is:
A) The boundary between the hot upper layer and cool lower layer
B) The floor level
C) The ceiling level
D) The area of highest oxygen concentration
Answer: A
7. Which of the following is a common characteristic of a "fire cause" classified as
"undetermined"?
A) Sufficient evidence points to an accidental cause
B) The investigator cannot identify the ignition source, first fuel, or sequence
C) The fire was clearly set intentionally
D) The fire was caused by natural events
Answer: B
8. "Radiant heat flux" is measured in:
A) Degrees Celsius
B) Watts per square meter (W/m²)
,C) Cubic meters per second
D) Kilograms per cubic meter
Answer: B
9. Which of the following materials would have the LOWEST thermal inertia?
A) Concrete
B) Steel
C) Wood
D) Gypsum wallboard
Answer: C (Wood has lower thermal inertia than concrete, steel, or gypsum, meaning it
heats up faster.)
10. The "fire regime" in a compartment refers to:
A) The legal framework governing fire investigations
B) The ventilation and fuel conditions that control fire development
C) The type of accelerants present
D) The building's fire protection systems
Answer: B
11. "Flame cooling" is a mechanism by which fire suppression works by:
A) Removing the fuel
B) Removing the oxygen
C) Absorbing heat and reducing the temperature below ignition point
D) Interrupting the chemical chain reaction
Answer: C
12. Which of the following is an example of a "Class K" fire?
A) Wood and paper
B) Flammable liquids
, C) Energized electrical equipment
D) Cooking oils and fats
Answer: D (Class K is for cooking oils and fats, typically in commercial kitchens.)
13. The "depth of char" on wood is influenced by all of the following EXCEPT:
A) Heat flux intensity
B) Duration of exposure
C) Wood species and density
D) The color of the wood before the fire
Answer: D
14. "Sooting" patterns on walls are caused by:
A) Direct flame contact
B) Deposition of unburned carbon particles from smoke
C) Conductive heat transfer
D) Spalling of the wall surface
Answer: B
15. Which of the following is a "line of demarcation" in fire pattern analysis?
A) The boundary between burned and unburned areas
B) The line of firefighter hose advancement
C) The property line between buildings
D) The electrical service line
Answer: A
16. The "minimum ignition temperature" of a dust cloud is:
A) The temperature at which a dust layer ignites
B) The lowest temperature at which a dust cloud ignites
C) The temperature at which a dust cloud explodes
1. Which of the following best defines "fire behavior" as used in fire investigation?
A) The physical and chemical changes occurring during combustion
B) The manner in which a fire reacts to its environment
C) The study of fire patterns left on surfaces
D) The legal classification of fire cause
Answer: B
2. According to NFPA 921, which of the following is the FIRST step in the scientific
method for fire investigation?
A) Collect data
B) Develop a hypothesis
C) Recognize the need
D) Test the hypothesis
Answer: C (Recognize the need is the first step—identifying that a fire occurred and
investigation is required.)
3. The "buoyancy" of fire gases is primarily due to:
A) Their higher density compared to air
B) Their lower density compared to air
C) Their chemical composition
D) The color of the smoke
Answer: B (Hot gases are less dense than air and rise due to buoyancy.)
4. Which type of fire pattern is characterized by a sharp, distinct line between
burned and unburned surfaces?
A) Shadow pattern
B) Protected area pattern
C) Clean burn pattern
,D) Alligatoring pattern
Answer: C (A clean burn has a distinct demarcation line where the fire's heat removed
soot or char.)
5. The term "heat of vaporization" refers to:
A) The heat required to raise a liquid's temperature
B) The heat required to convert a liquid to a vapor
C) The heat released during combustion
D) The heat required to ignite a solid
Answer: B
6. In a compartment fire, the "neutral plane" is:
A) The boundary between the hot upper layer and cool lower layer
B) The floor level
C) The ceiling level
D) The area of highest oxygen concentration
Answer: A
7. Which of the following is a common characteristic of a "fire cause" classified as
"undetermined"?
A) Sufficient evidence points to an accidental cause
B) The investigator cannot identify the ignition source, first fuel, or sequence
C) The fire was clearly set intentionally
D) The fire was caused by natural events
Answer: B
8. "Radiant heat flux" is measured in:
A) Degrees Celsius
B) Watts per square meter (W/m²)
,C) Cubic meters per second
D) Kilograms per cubic meter
Answer: B
9. Which of the following materials would have the LOWEST thermal inertia?
A) Concrete
B) Steel
C) Wood
D) Gypsum wallboard
Answer: C (Wood has lower thermal inertia than concrete, steel, or gypsum, meaning it
heats up faster.)
10. The "fire regime" in a compartment refers to:
A) The legal framework governing fire investigations
B) The ventilation and fuel conditions that control fire development
C) The type of accelerants present
D) The building's fire protection systems
Answer: B
11. "Flame cooling" is a mechanism by which fire suppression works by:
A) Removing the fuel
B) Removing the oxygen
C) Absorbing heat and reducing the temperature below ignition point
D) Interrupting the chemical chain reaction
Answer: C
12. Which of the following is an example of a "Class K" fire?
A) Wood and paper
B) Flammable liquids
, C) Energized electrical equipment
D) Cooking oils and fats
Answer: D (Class K is for cooking oils and fats, typically in commercial kitchens.)
13. The "depth of char" on wood is influenced by all of the following EXCEPT:
A) Heat flux intensity
B) Duration of exposure
C) Wood species and density
D) The color of the wood before the fire
Answer: D
14. "Sooting" patterns on walls are caused by:
A) Direct flame contact
B) Deposition of unburned carbon particles from smoke
C) Conductive heat transfer
D) Spalling of the wall surface
Answer: B
15. Which of the following is a "line of demarcation" in fire pattern analysis?
A) The boundary between burned and unburned areas
B) The line of firefighter hose advancement
C) The property line between buildings
D) The electrical service line
Answer: A
16. The "minimum ignition temperature" of a dust cloud is:
A) The temperature at which a dust layer ignites
B) The lowest temperature at which a dust cloud ignites
C) The temperature at which a dust cloud explodes
