HAZMAT OPS EXAM N 250 EXAM SCRIPT
2026 TEST PAPER QUESTIONS AND
SOLUTIONS GRADED A+
◉ Ops level responders may perform tasks above their training level
using....
Answer: Written or Direct Guidance from Allied Professional or
Hazmat Materials Technician (HMT)
◉ Hazmat Operations Level Responders are not normally _________.
Answer: Offensive (at point of release)
◉ Hazmat Operations Level Responders are normally _____.
Answer: Defensive (remotely, away from, indirectly)
◉ Physical Properties.
Answer: do not involve the chemistry or chemical nature of the
materials
◉ Chemical Properties.
Answer: occur at the MOLECULAR LEVEL
,◉ Boiling Point.
Answer: liquid turns into a gas at the surface
◉ Chemical Reactivity.
Answer: susceptibility of material to RELEASE ENERGY by itself or in
combination with other materials
◉ Corrosivity (pH).
Answer: a measure of a substance's TENDENCY TO DETERIORATE
IN THE PRESENCE OF ANOTHER SUBSTANCE or in a particular
environment
◉ Acid.
Answer: pH less than
◉ Acid turns Litmus paper.
Answer: red
◉ Base.
Answer: pH more than 7
◉ Base turns Litmus paper.
,Answer: blue
◉ Base is also known as.
Answer: Alkalie or Caustic
◉ Lower Explosive Limit (LEL).
Answer: minimum concentration of vapor to air BELOW WHICH a
flame will not propagate
◉ Lower Explosive Limit (LEL) also known as.
Answer: Too lean to burn
◉ Upper Explosive Limit (UEL).
Answer: maximum vapor to air concentration ABOVE WHICH a
flame will not propagate
◉ Upper Explosive Limit (UEL) also known as.
Answer: Too rich to burn
◉ Flammable Range or Combustible Mixture is the level between.
Answer: Upper and Lower Explosive Limit
, ◉ Flash Point.
Answer: temperature at which a LIQUID WILL GIVE OFF
SUFFICIENT VAPORS THAT WILL IGNITE READILY given an ignition
source. (fire does not have to continue to burn)
◉ Ignition / Autoignition Temperature.
Answer: self-sustained combustion in the absence of any source of
ignition
◉ Particle Size.
Answer: Solids, expressed in microns or percent passing through a
meshed screen
◉ Persistence.
Answer: material's ability to stay within the area of release for long
periods of time. (Generally more than 24 hours, prevent personnel
from re-entering the area)
◉ Solid.
Answer: Specific shape, stable, definite volume
◉ Liquid.
Answer: not definite but is determined by its container
2026 TEST PAPER QUESTIONS AND
SOLUTIONS GRADED A+
◉ Ops level responders may perform tasks above their training level
using....
Answer: Written or Direct Guidance from Allied Professional or
Hazmat Materials Technician (HMT)
◉ Hazmat Operations Level Responders are not normally _________.
Answer: Offensive (at point of release)
◉ Hazmat Operations Level Responders are normally _____.
Answer: Defensive (remotely, away from, indirectly)
◉ Physical Properties.
Answer: do not involve the chemistry or chemical nature of the
materials
◉ Chemical Properties.
Answer: occur at the MOLECULAR LEVEL
,◉ Boiling Point.
Answer: liquid turns into a gas at the surface
◉ Chemical Reactivity.
Answer: susceptibility of material to RELEASE ENERGY by itself or in
combination with other materials
◉ Corrosivity (pH).
Answer: a measure of a substance's TENDENCY TO DETERIORATE
IN THE PRESENCE OF ANOTHER SUBSTANCE or in a particular
environment
◉ Acid.
Answer: pH less than
◉ Acid turns Litmus paper.
Answer: red
◉ Base.
Answer: pH more than 7
◉ Base turns Litmus paper.
,Answer: blue
◉ Base is also known as.
Answer: Alkalie or Caustic
◉ Lower Explosive Limit (LEL).
Answer: minimum concentration of vapor to air BELOW WHICH a
flame will not propagate
◉ Lower Explosive Limit (LEL) also known as.
Answer: Too lean to burn
◉ Upper Explosive Limit (UEL).
Answer: maximum vapor to air concentration ABOVE WHICH a
flame will not propagate
◉ Upper Explosive Limit (UEL) also known as.
Answer: Too rich to burn
◉ Flammable Range or Combustible Mixture is the level between.
Answer: Upper and Lower Explosive Limit
, ◉ Flash Point.
Answer: temperature at which a LIQUID WILL GIVE OFF
SUFFICIENT VAPORS THAT WILL IGNITE READILY given an ignition
source. (fire does not have to continue to burn)
◉ Ignition / Autoignition Temperature.
Answer: self-sustained combustion in the absence of any source of
ignition
◉ Particle Size.
Answer: Solids, expressed in microns or percent passing through a
meshed screen
◉ Persistence.
Answer: material's ability to stay within the area of release for long
periods of time. (Generally more than 24 hours, prevent personnel
from re-entering the area)
◉ Solid.
Answer: Specific shape, stable, definite volume
◉ Liquid.
Answer: not definite but is determined by its container
