11/23/25, 12:31 PM Hazmat Ops - MFRI - REVIEW
Hazmat Ops - MFRI – REVIEW EXAM 2026\NEWEST
VERSION WITH COMPLETE QUESTIONS AND CORRECT
DETAILED ANSWERS \VERIFIED 100% \ASSURED PASS
What is the US DOT definition Hazardous material is a substance or material that is
of hazardous materials, as capable of posing an unreasonable risk to health,
found in 49 CFR? safety and property when transported in commerce.
Any item or chemical which can cause harm to people,
What is the EPA definition of a
plants or animals when released by spilling, leaking,
hazardous substance?
pouring, emitting, emptying, discharging, injecting,
escaping, leaching, dumping, or disposing into the
environment.
The lowest temperature at which a combustible material
Flash point
will produce an ignitable vapor.
minimum temperature a substance should attain in
Ignition temperature
order to ignite under specific test conditions
the temperature at which the vapor pressure of a liquid
Boiling point
equals the surrounding atmospheric pressure
The ability of a substance to dissolve in water
Soluble
liquid held inside of a closed container
Vapor pressure
the weight of an airborne concentration as compared to
Vapor density
an equal volume of dry air
the weight of a liquid as compared to water
Specific gravity
positively charged particles emitted by certain
Alpha particle
radioactive materials, identical to the nucleus of a
helium atom
elementary particles, emitted from a nucleus during
Beta particle
radioactive decay, with a single electrical charge and a
mass equal to that of a proton
/ 1/1
0
, 11/23/25, 12:31 PM Hazmat Ops - MFRI - REVIEW
penetrating particles found in the nucleus of the atom
Neutron particle that are removed through nuclear fusion or fission.
Although neutrons are not radioactive, exposures to
them can create radiation
Gamma high energy, short wavelength, electromagnetic radiation
Flammable range the range of concentration between the lower and upper
flammable limits
Upper explosive limit The maximum concentration of a flammable vapor in air that will
ignite
Lower explosive limit minimum concentration of a flammable vapor in air that will ignite
Polymerization the process of reacting monomers together in a chain reaction to
form polymers
pH an expression of the amount of dissolved hydrogen ions in a
solution
Exposure to come in contact / in the area
Contamination taking it with you
transfer of a substance to a non-contaminated person or
Secondary contamination
item via contact with someone or something already
contaminated by the substance
Chronic exposure produce chronic health effects / long term or many short term
exposures
"right now" exposures that produce observable signs
Acute exposure
such as eye irritation , coughing, dizziness and skin
burns
Chronic health effects appear after long term exposure / appear after multiple short
term exposures
health problems caused by relatively short exposure
Acute health effects periods to a harmful substance that produces
observable conditions such as eye irritations, coughing,
dizziness and skin burns
any packaging, including transport vehicles, having a
Bulk Packaging liquid capacity of more than 119 gallons, a solid
capacity of more than 882 lbs, or a compressed gas
water capacity of more than 1001 lbs.
What is the route of exposure inhalation
for a material with a LD50?
Inhalation exposure to a hazardous material by breathing the substance into
the lungs
/ 2/1
0
Hazmat Ops - MFRI – REVIEW EXAM 2026\NEWEST
VERSION WITH COMPLETE QUESTIONS AND CORRECT
DETAILED ANSWERS \VERIFIED 100% \ASSURED PASS
What is the US DOT definition Hazardous material is a substance or material that is
of hazardous materials, as capable of posing an unreasonable risk to health,
found in 49 CFR? safety and property when transported in commerce.
Any item or chemical which can cause harm to people,
What is the EPA definition of a
plants or animals when released by spilling, leaking,
hazardous substance?
pouring, emitting, emptying, discharging, injecting,
escaping, leaching, dumping, or disposing into the
environment.
The lowest temperature at which a combustible material
Flash point
will produce an ignitable vapor.
minimum temperature a substance should attain in
Ignition temperature
order to ignite under specific test conditions
the temperature at which the vapor pressure of a liquid
Boiling point
equals the surrounding atmospheric pressure
The ability of a substance to dissolve in water
Soluble
liquid held inside of a closed container
Vapor pressure
the weight of an airborne concentration as compared to
Vapor density
an equal volume of dry air
the weight of a liquid as compared to water
Specific gravity
positively charged particles emitted by certain
Alpha particle
radioactive materials, identical to the nucleus of a
helium atom
elementary particles, emitted from a nucleus during
Beta particle
radioactive decay, with a single electrical charge and a
mass equal to that of a proton
/ 1/1
0
, 11/23/25, 12:31 PM Hazmat Ops - MFRI - REVIEW
penetrating particles found in the nucleus of the atom
Neutron particle that are removed through nuclear fusion or fission.
Although neutrons are not radioactive, exposures to
them can create radiation
Gamma high energy, short wavelength, electromagnetic radiation
Flammable range the range of concentration between the lower and upper
flammable limits
Upper explosive limit The maximum concentration of a flammable vapor in air that will
ignite
Lower explosive limit minimum concentration of a flammable vapor in air that will ignite
Polymerization the process of reacting monomers together in a chain reaction to
form polymers
pH an expression of the amount of dissolved hydrogen ions in a
solution
Exposure to come in contact / in the area
Contamination taking it with you
transfer of a substance to a non-contaminated person or
Secondary contamination
item via contact with someone or something already
contaminated by the substance
Chronic exposure produce chronic health effects / long term or many short term
exposures
"right now" exposures that produce observable signs
Acute exposure
such as eye irritation , coughing, dizziness and skin
burns
Chronic health effects appear after long term exposure / appear after multiple short
term exposures
health problems caused by relatively short exposure
Acute health effects periods to a harmful substance that produces
observable conditions such as eye irritations, coughing,
dizziness and skin burns
any packaging, including transport vehicles, having a
Bulk Packaging liquid capacity of more than 119 gallons, a solid
capacity of more than 882 lbs, or a compressed gas
water capacity of more than 1001 lbs.
What is the route of exposure inhalation
for a material with a LD50?
Inhalation exposure to a hazardous material by breathing the substance into
the lungs
/ 2/1
0
