NFPA 921 FIRE AND EXPLOSION
INVESTIGATIONS EXAM WITH CORRECT
ACTUAL QUESTIONS AND CORRECTLY
WELL DEFINED ANSWERS LATEST 2025
ALREADY GRADED A+
Explosion injuries - ANSWERS-The four categories of _____ _______ are blast
pressure injuries, shrapnel injuries, thermal injuries, and building collapse
injuries. (25.2.10)
Blast pressure injury - ANSWERS-This type of concussive effect (explosion-
related injury) upon a victim can cause internal injuries to various organs and
body systems such as the gastrointestinal tract, lungs, eardrums, and blood
vessels. (25.2.10.1)
Shrapnel injuries - ANSWERS-What type of explosion related injury causes solid
fragments traveling at a high speed's from the epicenter of an explosion that
,can cause amputations, dismemberment, lacerations, localized blunt trauma,
and crushed bones? (25.2.10.2)
Skin, fat, muscle, & bone - ANSWERS-Four major combustible components of
the body. (25.3)
Pugilistic posture - ANSWERS-When muscle tissue shrinks due to dehydration,
the flexion can produce _____ ______ (25.3.2)
Lividity - ANSWERS-When the circulation of blood through vessels and
capillaries ceases and the blood begins to settle due to gravity, into the lowest
available portions of the body. (25.4.1)
Coronor - ANSWERS-Who is responsible for determining the cause and manner
of death of the victim? (25.9.1.1)
Ampacity - ANSWERS-The maximum current, in amperes, that a conductor can
carry continuously under the conditions of use without exceeding its
temperature rating.
Ampere - ANSWERS-The unit of electric current that is equivalent to a flow of
one coulomb per second; one coulomb is defined as 6.24 × 1018 electrons.
Arc - ANSWERS-A high-temperature luminous electric discharge across a gap or
through a medium such as charred insulation.
,Arc Mapping - ANSWERS-The systematic evaluation of the electrical circuit
configuration, spatial relationship of the circuit components, and identification
of electrical arc sites to assist in the identification of the area of origin and
analysis of the fire's spread.
Arc Site - ANSWERS-The location on a conductor with localized damage that
resulted from an electrical arc.
Arcing Through Char - ANSWERS-Arcing associated with a matrix of charred
material (e.g., charred conductor insulation) that acts as a semiconductive
medium.
Area of Origin - ANSWERS-A structure, part of a structure, or general geographic
location within a fire scene, in which the "point of origin" of a fire or explosion
is reasonably believed to be located.
Arrow Pattern - ANSWERS-A fire pattern displayed on the cross- section of a
burned wooden structural member.
Arson - ANSWERS-The crime of maliciously and intentionally, or recklessly,
starting a fire or causing an explosion.
Autoignition - ANSWERS-Initiation of combustion by heat but without a spark or
flame.
, Autoignition Temperature - ANSWERS-The lowest temperature at which a
combustible material ignites in air without a spark or flame.
Approved - ANSWERS-Acceptable to the authority having jurisdiction.
Guide - ANSWERS-A document that is advisory or informative in nature and that
contains only nonmandatory provisions. A _____ may contain mandatory
statements such as when a _____ can be used, but the document as a whole is
not suitable for adoption into law.
Recommended Practice - ANSWERS-A document that is similar in content and
structure to a code or standard but that contains only nonmandatory provisions
using the word "should" to indicate recommendations in the body of the text.
Standard - ANSWERS-An NFPA Standard, the main text of which contains only
mandatory provisions using the word "shall" to indicate requirements and that
is in a form generally suitable for mandatory reference by another standard or
code or for adoption into law. When used in a generic sense, such as in the
phrase "standards development process" or "standards development
activities," the term "standards" includes all NFPA Standards, including Codes,
Standards, Recommended Practices, and Guides.
Code - ANSWERS-A standard that is an extensive compilation of provisions
covering broad subject matter or that is suitable for adoption into law
independently of other codes and standards.
INVESTIGATIONS EXAM WITH CORRECT
ACTUAL QUESTIONS AND CORRECTLY
WELL DEFINED ANSWERS LATEST 2025
ALREADY GRADED A+
Explosion injuries - ANSWERS-The four categories of _____ _______ are blast
pressure injuries, shrapnel injuries, thermal injuries, and building collapse
injuries. (25.2.10)
Blast pressure injury - ANSWERS-This type of concussive effect (explosion-
related injury) upon a victim can cause internal injuries to various organs and
body systems such as the gastrointestinal tract, lungs, eardrums, and blood
vessels. (25.2.10.1)
Shrapnel injuries - ANSWERS-What type of explosion related injury causes solid
fragments traveling at a high speed's from the epicenter of an explosion that
,can cause amputations, dismemberment, lacerations, localized blunt trauma,
and crushed bones? (25.2.10.2)
Skin, fat, muscle, & bone - ANSWERS-Four major combustible components of
the body. (25.3)
Pugilistic posture - ANSWERS-When muscle tissue shrinks due to dehydration,
the flexion can produce _____ ______ (25.3.2)
Lividity - ANSWERS-When the circulation of blood through vessels and
capillaries ceases and the blood begins to settle due to gravity, into the lowest
available portions of the body. (25.4.1)
Coronor - ANSWERS-Who is responsible for determining the cause and manner
of death of the victim? (25.9.1.1)
Ampacity - ANSWERS-The maximum current, in amperes, that a conductor can
carry continuously under the conditions of use without exceeding its
temperature rating.
Ampere - ANSWERS-The unit of electric current that is equivalent to a flow of
one coulomb per second; one coulomb is defined as 6.24 × 1018 electrons.
Arc - ANSWERS-A high-temperature luminous electric discharge across a gap or
through a medium such as charred insulation.
,Arc Mapping - ANSWERS-The systematic evaluation of the electrical circuit
configuration, spatial relationship of the circuit components, and identification
of electrical arc sites to assist in the identification of the area of origin and
analysis of the fire's spread.
Arc Site - ANSWERS-The location on a conductor with localized damage that
resulted from an electrical arc.
Arcing Through Char - ANSWERS-Arcing associated with a matrix of charred
material (e.g., charred conductor insulation) that acts as a semiconductive
medium.
Area of Origin - ANSWERS-A structure, part of a structure, or general geographic
location within a fire scene, in which the "point of origin" of a fire or explosion
is reasonably believed to be located.
Arrow Pattern - ANSWERS-A fire pattern displayed on the cross- section of a
burned wooden structural member.
Arson - ANSWERS-The crime of maliciously and intentionally, or recklessly,
starting a fire or causing an explosion.
Autoignition - ANSWERS-Initiation of combustion by heat but without a spark or
flame.
, Autoignition Temperature - ANSWERS-The lowest temperature at which a
combustible material ignites in air without a spark or flame.
Approved - ANSWERS-Acceptable to the authority having jurisdiction.
Guide - ANSWERS-A document that is advisory or informative in nature and that
contains only nonmandatory provisions. A _____ may contain mandatory
statements such as when a _____ can be used, but the document as a whole is
not suitable for adoption into law.
Recommended Practice - ANSWERS-A document that is similar in content and
structure to a code or standard but that contains only nonmandatory provisions
using the word "should" to indicate recommendations in the body of the text.
Standard - ANSWERS-An NFPA Standard, the main text of which contains only
mandatory provisions using the word "shall" to indicate requirements and that
is in a form generally suitable for mandatory reference by another standard or
code or for adoption into law. When used in a generic sense, such as in the
phrase "standards development process" or "standards development
activities," the term "standards" includes all NFPA Standards, including Codes,
Standards, Recommended Practices, and Guides.
Code - ANSWERS-A standard that is an extensive compilation of provisions
covering broad subject matter or that is suitable for adoption into law
independently of other codes and standards.
