Hazmat Ops - MFRI – REVIEW
Questions and Answers 100% Pass
What is the US DOT definition of hazardous materials, as found in 49 CFR? -
✔✔Hazardous material is a substance or material that is capable of posing an
unreasonable risk to health, safety and property when transported in commerce.
What is the EPA definition of a hazardous substance? - ✔✔Any item or chemical which
can cause harm to people, plants or animals when released by spilling, leaking, pouring,
emitting, emptying, discharging, injecting, escaping, leaching, dumping, or disposing
into the environment.
Flash point - ✔✔The lowest temperature at which a combustible material will produce
an ignitable vapor.
Ignition temperature - ✔✔minimum temperature a substance should attain in order to
ignite under specific test conditions
Boiling point - ✔✔the temperature at which the vapor pressure of a liquid equals the
surrounding atmospheric pressure
Soluble - ✔✔The ability of a substance to dissolve in water
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, Vapor pressure - ✔✔liquid held inside of a closed container
Vapor density - ✔✔the weight of an airborne concentration as compared to an equal
volume of dry air
Specific gravity - ✔✔the weight of a liquid as compared to water
Alpha particle - ✔✔positively charged particles emitted by certain radioactive
materials, identical to the nucleus of a helium atom
Beta particle - ✔✔elementary particles, emitted from a nucleus during radioactive
decay, with a single electrical charge and a mass equal to that of a proton
Neutron particle - ✔✔penetrating particles found in the nucleus of the atom 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
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Questions and Answers 100% Pass
What is the US DOT definition of hazardous materials, as found in 49 CFR? -
✔✔Hazardous material is a substance or material that is capable of posing an
unreasonable risk to health, safety and property when transported in commerce.
What is the EPA definition of a hazardous substance? - ✔✔Any item or chemical which
can cause harm to people, plants or animals when released by spilling, leaking, pouring,
emitting, emptying, discharging, injecting, escaping, leaching, dumping, or disposing
into the environment.
Flash point - ✔✔The lowest temperature at which a combustible material will produce
an ignitable vapor.
Ignition temperature - ✔✔minimum temperature a substance should attain in order to
ignite under specific test conditions
Boiling point - ✔✔the temperature at which the vapor pressure of a liquid equals the
surrounding atmospheric pressure
Soluble - ✔✔The ability of a substance to dissolve in water
Brittie Donald, All Rights Reserved © 2025 1
, Vapor pressure - ✔✔liquid held inside of a closed container
Vapor density - ✔✔the weight of an airborne concentration as compared to an equal
volume of dry air
Specific gravity - ✔✔the weight of a liquid as compared to water
Alpha particle - ✔✔positively charged particles emitted by certain radioactive
materials, identical to the nucleus of a helium atom
Beta particle - ✔✔elementary particles, emitted from a nucleus during radioactive
decay, with a single electrical charge and a mass equal to that of a proton
Neutron particle - ✔✔penetrating particles found in the nucleus of the atom 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
Brittie Donald, All Rights Reserved © 2025 2
