A DOT placard displaying the number 3 with a red background depicts what hazard class?
Hazmat Recognition Identification
Question · Easy
What a Safety Data Sheet tells you
Short
NFPA 470 Hazmat Awareness Exam Guide 2026: Scope, ERG and Practice
Blog
You see an orange DOT placard with no other markings. What hazard class is this?
Recognition & Identification
Flashcard
An NFPA 704 diamond shows a 4 in the blue quadrant. What does this indicate?
Catastrophic vessel rupture and fireball caused when a pressurized tank holding liquid above its normal boiling point fails during fire exposure, unlike a non-fragmenting heat-induced tear.
Hazard & Classification Recognition
Guess the Term
Chapter 1: Recognition & Identification
1.1 DOT Placards and Labeling System
Study guide
Cheat sheet
You arrive at a transportation incident and observe a placard with a yellow background, a circle with rays, and the number 7. What class is involved?
Read the clue and guess the term in 6 tries.
Game
A red DOT placard with the number 2 indicates what?
A cylindrical highway tank with rounded ends, a single dome, and no insulation jacket carrying gasoline most closely matches which DOT specification?
Hazmat Container Types
Question · Medium
Minimum liquid temperature that generates enough ignitable vapor at the surface to momentarily ignite when an external flame is applied, lower than the fire point or autoignition temperature.
The orange section of the Emergency Response Guidebook (ERG) provides what information?
Hazmat Resources
How do you tell a Class 2.2 (non-flammable gas) placard from a Class 2.3 (toxic gas) placard at a glance?
At the Awareness level, what is the FIRST defensive action upon recognizing a hazmat release?
Hazmat Initial Response
Gaseous phase given off by a substance that is normally liquid or solid at ambient temperature, whose density relative to air dictates whether it rises or pools in low areas.
1.2 The NFPA 704 Fire Diamond
Which national resource provides 24/7 chemical emergency response information by phone at 1-800-424-9300?
Swap tiles to line up three of the same term.
Term Match
What do the three Class 4 sub-divisions (4.1, 4.2, 4.3) each mean?
An Awareness-level responder is permitted to perform which of the following?
Hazmat Initial Action Limitations
DOT Class 6 Division 6.1 classification word synonymous with poisonous on placards and labels for non-gaseous substances harmful to human health, distinct from Division 6.2 infectious materials.
A railroad tank car with a sloping protective housing and multiple top fittings is most likely transporting:
A fully yellow DOT placard is on a tank truck. Which hazard class does it indicate, and how does the related Class 5.2 placard differ?
Which DOT hazard class label depicts a skull and crossbones?
Minimum volume percentage of a gas or vapor in air below which the atmosphere is too lean to propagate flame upon contact with an ignition source, opposite the upper threshold.
1.3 Shipping Papers and Safety Data Sheets (SDS)
Which document accompanies a shipment of hazardous materials by highway and identifies the product and quantity?
Flip two cards at a time to find matching terms.
Term Pairs
What is the visual difference between a Class 6.1 and a Class 6.2 placard?
On a Safety Data Sheet (SDS), which section provides emergency overview and hazard classification?
Maximum volume percentage of a gas or vapor in air above which the vapor-air mixture is too rich to burn when exposed to an ignition source, opposite the lean threshold.
In the DOT transport hazard divisions, which description identifies Division 2.3?
Hazmat Hazards Classification
How do you recognize a Class 7 (Radioactive) placard?
You suspect a release of an unknown gas. The wind is from the south. Where should incoming units stage?
Airborne concentration threshold established by NIOSH that poses an immediate threat to survival, causes irreversible health damage, or impairs escape capability within thirty minutes.
Chapter 2: Initial Response Staging & Positioning
2.1 Scene Approach and Safe Staging
Which placard color background represents Class 8 corrosives?
Find five hidden terms in a grid of letters.
Term Search
A placard is white on top and black on the bottom with liquid-pouring symbols. What class is it?
Which of these is NOT an Awareness-level task per NFPA 470?
Legally enforceable workplace airborne concentration cap promulgated by OSHA under 29 CFR 1910.1000, rather than a non-regulatory NIOSH guideline or an acute escape threshold.
A four-digit number 1203 displayed in the center of an orange panel indicates:
What do the four NFPA 704 diamond quadrant colors represent?
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