CDL Hazmat Practice Test
Prepare for the H endorsement exam. 30 questions covering all 9 hazmat classes, placarding, shipping papers, and emergency response. Need 24 correct to pass.
About the CDL Hazmat Endorsement
The H endorsement is required to transport hazardous materials in quantities that require placarding under federal regulations. Hazmat drivers carry some of the most dangerous cargo on the road — from gasoline tankers to chemical shipments — and must demonstrate thorough knowledge of federal safety rules.
The Hazmat endorsement test has 30 questions; you need at least 24 correct (80%) to pass. Unlike other CDL tests, obtaining the hazmat endorsement also requires passing a TSA fingerprint-based background check, which can take several days to weeks to process.
Placard rules are especially important: most hazmat placards are required when you carry 1,000 lbs or more of a material in a single shipment, though some materials (like explosives and poison gases) require placards in ANY quantity.
Key Hazmat Topics
Hazmat Classes
All 9 classes: explosives, gases, flammable liquids, flammable solids, oxidizers, poisons, radioactive, corrosives, and miscellaneous.
Placarding Requirements
When placards are required (>1,000 lbs of most materials), which placard to use, and correct placement.
Shipping Papers
Bills of lading, manifests, and shipping papers — where to keep them and what information they must contain.
Emergency Response
Emergency Response Guidebook (ERG), notification requirements, and first responder information.
Loading Rules
Loading and unloading procedures, segregation tables (what can't travel together), and parking rules.
Security Plans
Federal security plan requirements, recognizing security threats, and en-route security measures.
The 9 Hazardous Materials Classes
| Class | Name | Common Examples |
|---|---|---|
| 1 | Explosives | Ammunition, fireworks, TNT |
| 2 | Gases | Propane, oxygen, chlorine |
| 3 | Flammable Liquids | Gasoline, ethanol, diesel |
| 4 | Flammable Solids | Matches, metal powders |
| 5 | Oxidizers | Hydrogen peroxide, ammonium nitrate |
| 6 | Poisons | Pesticides, cyanide compounds |
| 7 | Radioactive | Uranium, medical isotopes |
| 8 | Corrosives | Sulfuric acid, battery fluid |
| 9 | Miscellaneous | Dry ice, lithium batteries, magnetized material |
Frequently Asked Questions
What does the H endorsement allow you to do?
The H endorsement (Hazardous Materials) allows you to transport hazardous materials as defined by federal regulations. This includes flammable liquids and gases, explosives, poisons, corrosives, radioactive materials, and other dangerous goods in quantities that require placarding.
How many questions are on the CDL Hazmat test?
The CDL Hazmat endorsement test has 30 questions. You must answer at least 24 questions correctly to pass (80%).
Do you need a background check for the CDL Hazmat endorsement?
Yes. Federal law requires a Transportation Security Administration (TSA) fingerprint-based background check for all CDL Hazmat endorsement applicants. The background check screens for criminal history and immigration status. This check must be completed before the endorsement is added to your CDL.
How long is the CDL Hazmat endorsement valid?
The hazmat endorsement is valid for the same period as your CDL, typically 4 to 8 years depending on your state. However, you must pass the TSA background check every five years to maintain the endorsement.
What are the 9 hazmat classes?
The nine hazmat classes are: Class 1 (Explosives), Class 2 (Gases), Class 3 (Flammable and Combustible Liquids), Class 4 (Flammable Solids, Spontaneously Combustible), Class 5 (Oxidizers and Organic Peroxides), Class 6 (Poisons and Infectious Substances), Class 7 (Radioactive Materials), Class 8 (Corrosives), and Class 9 (Miscellaneous Hazardous Materials).
Earn Your Hazmat Endorsement
Practice all 30 hazmat question types and pass the test with confidence.
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