FIRE INVESTIGATOR: PRINCIPLES AND
PRACTICE TO NFPA 921 AND 1033.
EXAM 2025/2026 QUESTIONS AND
ANSWERS 100% PASS.
Accelerant - ANS Any fuel or oxidizer, often an ignitable liquid, used to initiate a fire or
increase the rate of growth or speed the spread of fire.
Accidental Fires - ANS Fires for which the proven cause does not involve an intentional
human act to ignite or spread fire into an area where the fire should not be.
Accommodation Space - ANS A space on a vessel designed for people to live in.
Active Fire Protection System - ANS Any type of fire protection system that automatically
activates upon detection of a fire condition.
Addressable Technology - ANS Fire alarm and detection systems in which devices and system
components are assigned a data address, are capable of two-way communication, and can
perform certain activities based on signal input.
Adolescent Firesetters - ANS Adolescents, ages 14 to 16 years, who are often responsible for
fires that occur at places other than their homes.
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
,Adrift - ANS Loose, not on moorings or towline.
Aerial Fuels - ANS All green or dead materials located in the forest canopy.
Affidavit - ANS A voluntary written statement of fact or opinion made under oath and signed
by the author.
Afloat - ANS Floating in water; not sinking.
Air Drop - ANS The aerial application of water, foam, or retardant mixture directly onto the
fire or threatened area or along a strategic position ahead of the fire.
Air Entrainment - ANS The process of air or gases being drawn into a fire, plume, or jet.
Air Sampling Smoke Detection - ANS A method of smoke detection designed to draw air from
the protected area into a detection chamber for analysis.
Alarm Pressure Switch - ANS A type of initiating device installed on all types of wet-based fire
suppression systems; the device initiates a fire alarm signal once a water pressure threshold is
met.
Alarm Signal - ANS A warning signal that alerts occupants of a fire emergency.
Alloying - ANS The mixture of two or more metals in which one or more of the metals is in a
liquefied state.
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
,Alternating Current (AC) - ANS The voltage varies in time with a sine wave at 60 cycles per
second. A sine-wave current results if the load is resistive.
Ambient Temperature - ANS Air temperature of the surrounding environment.
Ampacity - ANS The current, in amperes, that a conductor can carry continuously under the
conditions of use without exceeding its temperature rating.
Amperage - ANS The unit of electric current that is equivalent to a flow of one coulomb per
second; one coulomb is defined as 6.24 x 10^18 (18th power) electrons.
Annunciation Panel - ANS A device that uses indicating lamps, alphanumeric displays, or
other means to provide first responders with status, condition, and location information
concerning fire alarm system components and devices.
Arc Mapping - ANS The analysis of the locations where electrical arcing has caused damage
and the documentation of the involved electrical circuits.
Arc Survey Diagrams - ANS Locations of electrical arcing are identified and plotted on a
diagram of the affected area of the structure. The spatial relationship of the arc sites can create
a pattern and help establish the sequence of damage. This analysis can be used on building
circuits and electrical devices within a compartment to help identify or narrow the area of
origin.
Arc Tube - ANS A cylinder of fused silica/quartz with electrodes at either end that is used in
most mercury and metal halide lamps.
Arc - ANS A high-temperature luminous electric discharge across a gap where the conductor
is missing or through a medium such as charred insulation.
3 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, Arced and Severed - ANS Occurs when wires are arced off on the ends and possible
segmented wires result.
Arc-Fault Circuit Interrupter (AFCI) - ANS Designed to protect against fires caused by arcing
faults in home electrical wiring. The circuitry continuously monitors current flow.
Area of Origin - ANS The room, building, or general area in which the point of origin is
located.
Arson - ANS The crime of maliciously and intentionally, or recklessly, starting a fire or causing
an explosion. Legal definitions of "arson" are defined by statues and judicial decisions that vary
among jurisdictions.
Aspect - ANS The direction the slope faces (N, E, S, W).
Assemblies - ANS Manufactured parts put together to make a completed product.
Autoignition Temperature (AIT) - ANS The lowest temperature at which a combustible
material ignites in air without a spark or flame.
Backflow Valve - ANS Prevents gas from re-entering a container or combustion system.
Balanced Pressure Proportioner - ANS A proportioner that uses an atmospheric tank and
pump to introduce the foam concentrate into the system with the water supply.
Balloon Frame Construction - ANS A construction type in which the exterior wall studs go
from the foundation wall to the roofline. The floor joists are attached to the walls by the use of
4 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
PRACTICE TO NFPA 921 AND 1033.
EXAM 2025/2026 QUESTIONS AND
ANSWERS 100% PASS.
Accelerant - ANS Any fuel or oxidizer, often an ignitable liquid, used to initiate a fire or
increase the rate of growth or speed the spread of fire.
Accidental Fires - ANS Fires for which the proven cause does not involve an intentional
human act to ignite or spread fire into an area where the fire should not be.
Accommodation Space - ANS A space on a vessel designed for people to live in.
Active Fire Protection System - ANS Any type of fire protection system that automatically
activates upon detection of a fire condition.
Addressable Technology - ANS Fire alarm and detection systems in which devices and system
components are assigned a data address, are capable of two-way communication, and can
perform certain activities based on signal input.
Adolescent Firesetters - ANS Adolescents, ages 14 to 16 years, who are often responsible for
fires that occur at places other than their homes.
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
,Adrift - ANS Loose, not on moorings or towline.
Aerial Fuels - ANS All green or dead materials located in the forest canopy.
Affidavit - ANS A voluntary written statement of fact or opinion made under oath and signed
by the author.
Afloat - ANS Floating in water; not sinking.
Air Drop - ANS The aerial application of water, foam, or retardant mixture directly onto the
fire or threatened area or along a strategic position ahead of the fire.
Air Entrainment - ANS The process of air or gases being drawn into a fire, plume, or jet.
Air Sampling Smoke Detection - ANS A method of smoke detection designed to draw air from
the protected area into a detection chamber for analysis.
Alarm Pressure Switch - ANS A type of initiating device installed on all types of wet-based fire
suppression systems; the device initiates a fire alarm signal once a water pressure threshold is
met.
Alarm Signal - ANS A warning signal that alerts occupants of a fire emergency.
Alloying - ANS The mixture of two or more metals in which one or more of the metals is in a
liquefied state.
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
,Alternating Current (AC) - ANS The voltage varies in time with a sine wave at 60 cycles per
second. A sine-wave current results if the load is resistive.
Ambient Temperature - ANS Air temperature of the surrounding environment.
Ampacity - ANS The current, in amperes, that a conductor can carry continuously under the
conditions of use without exceeding its temperature rating.
Amperage - ANS The unit of electric current that is equivalent to a flow of one coulomb per
second; one coulomb is defined as 6.24 x 10^18 (18th power) electrons.
Annunciation Panel - ANS A device that uses indicating lamps, alphanumeric displays, or
other means to provide first responders with status, condition, and location information
concerning fire alarm system components and devices.
Arc Mapping - ANS The analysis of the locations where electrical arcing has caused damage
and the documentation of the involved electrical circuits.
Arc Survey Diagrams - ANS Locations of electrical arcing are identified and plotted on a
diagram of the affected area of the structure. The spatial relationship of the arc sites can create
a pattern and help establish the sequence of damage. This analysis can be used on building
circuits and electrical devices within a compartment to help identify or narrow the area of
origin.
Arc Tube - ANS A cylinder of fused silica/quartz with electrodes at either end that is used in
most mercury and metal halide lamps.
Arc - ANS A high-temperature luminous electric discharge across a gap where the conductor
is missing or through a medium such as charred insulation.
3 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, Arced and Severed - ANS Occurs when wires are arced off on the ends and possible
segmented wires result.
Arc-Fault Circuit Interrupter (AFCI) - ANS Designed to protect against fires caused by arcing
faults in home electrical wiring. The circuitry continuously monitors current flow.
Area of Origin - ANS The room, building, or general area in which the point of origin is
located.
Arson - ANS The crime of maliciously and intentionally, or recklessly, starting a fire or causing
an explosion. Legal definitions of "arson" are defined by statues and judicial decisions that vary
among jurisdictions.
Aspect - ANS The direction the slope faces (N, E, S, W).
Assemblies - ANS Manufactured parts put together to make a completed product.
Autoignition Temperature (AIT) - ANS The lowest temperature at which a combustible
material ignites in air without a spark or flame.
Backflow Valve - ANS Prevents gas from re-entering a container or combustion system.
Balanced Pressure Proportioner - ANS A proportioner that uses an atmospheric tank and
pump to introduce the foam concentrate into the system with the water supply.
Balloon Frame Construction - ANS A construction type in which the exterior wall studs go
from the foundation wall to the roofline. The floor joists are attached to the walls by the use of
4 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
