25 realistic Hazardous Materials practice questions for California CDL applicants. Required for: Drivers transporting placarded hazardous materials. Official test: 30 questions, 24 correct to pass.
Question 1 of 25 · Shipping Papers
Drivers must check shipping papers for:
-
A.
Proper shipping name, hazard class, identification number
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B.
Total quantity
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C.
Emergency response number
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D.
All of the above
Correct answer: D.
Each entry must include the shipping name, class, ID number, quantity, and emergency contact.
Question 2 of 25 · HazMat Driving
When transporting HazMat over long distances, drivers should:
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A.
Stay alert, take rest breaks, and inspect the load regularly
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B.
Drive at maximum speed limit
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C.
Skip rest stops to save time
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D.
Avoid highways
Correct answer: A.
Stay alert with regular rest breaks; inspect cargo at every stop.
Question 3 of 25 · Placards
What does "subsidiary hazard class" mean?
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A.
A secondary hazard a material poses
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B.
A backup placard
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C.
A small package
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D.
A vehicle accessory
Correct answer: A.
Some materials have a primary and a subsidiary hazard class for additional risks.
Question 4 of 25 · Tank Operations
Which of these are dangers of hauling liquids in tanks?
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A.
Liquid surge
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B.
Outage requirements
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C.
Top-heavy load
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D.
All of the above
Correct answer: D.
Surge, outage, and high center of gravity all make tank vehicles uniquely dangerous.
Question 5 of 25 · Shipping Papers
Where can drivers find emergency contact information for the materials they're hauling?
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A.
On the placards
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B.
In the shipping papers
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C.
On the trailer doors
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D.
In the glove box
Correct answer: B.
A 24-hour emergency contact number must appear on the shipping papers.
Question 6 of 25 · Parking
When can a HazMat shipment be left unattended?
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A.
Whenever the driver leaves the vehicle
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B.
Only in safe locations such as a carrier facility
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C.
Anywhere with a sign
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D.
Only on private roads
Correct answer: B.
HazMat must be attended unless parked at a carrier facility or other approved location.
Question 7 of 25 · HazMat Driving
Drivers transporting Division 1.1, 1.2, or 1.3 explosives may NOT:
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A.
Take a route that goes through tunnels prohibiting explosives
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B.
Refuel at any station
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C.
Travel during business hours
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D.
Cross any state line
Correct answer: A.
Avoid tunnels and routes prohibiting explosives. Use only approved routes.
Question 8 of 25 · Placards
When must placards be displayed?
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A.
Before the vehicle is loaded
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B.
Once the HazMat is loaded and secured before driving
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C.
After the trip ends
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D.
Only at weigh stations
Correct answer: B.
Drivers must placard once HazMat is loaded and verify before moving the vehicle.
Question 9 of 25 · Shipping Papers
How can a driver determine the hazard class of a material?
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A.
Read the shipping paper or check the Hazardous Materials Table
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B.
Smell the package
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C.
Open the container
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D.
Ask other drivers
Correct answer: A.
The hazard class appears on shipping papers; the Hazardous Materials Table is the master reference.
Question 10 of 25 · HazMat Basics
Which is the goal of HazMat regulations?
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A.
To make HazMat transport safer for everyone
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B.
To allow easy transport of HazMat
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C.
To increase shipping costs
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D.
To require more inspections
Correct answer: A.
HazMat rules contain risk to public safety, property, and the environment.
Question 11 of 25 · Inspection
HazMat drivers must inspect tires:
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A.
Once a day
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B.
At the start of the trip and at every stop
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C.
Once a week
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D.
Only at weigh stations
Correct answer: B.
Inspect tires before the trip and at each stop because hot or damaged tires raise fire risk.
Question 12 of 25 · HazMat Driving
Drivers must avoid which of these areas when transporting HazMat?
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A.
Tunnels and bridges where prohibited
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B.
Heavily populated areas when alternative routes exist
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C.
Open flames or heat sources
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D.
All of the above
Correct answer: D.
Avoid restricted areas, populated zones, and any ignition sources.
Question 13 of 25 · Tank Operations
What does the term "outage" mean in HazMat tank operations?
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A.
Loss of electrical power
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B.
Empty space left in a tank to allow for liquid expansion
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C.
Out-of-service tank
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D.
A leak in the tank
Correct answer: B.
Outage is the empty space left for liquid expansion due to temperature changes.
Question 14 of 25 · Security
Which is true about HazMat training?
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A.
Drivers must be retrained every 3 years
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B.
Training is optional
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C.
Only new drivers need training
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D.
Training is the same as for non-HazMat
Correct answer: A.
HazMat training is required every three years, including security awareness.
Question 15 of 25 · Emergencies
What should you do if HazMat spills on the ground?
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A.
Cover with sand or absorbent material
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B.
Drive away from the spill
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C.
Get qualified help to handle the spill
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D.
Wash it down with water
Correct answer: C.
Get trained responders. Don't cover, push, or wash the spill yourself.
Question 16 of 25 · HazMat Basics
What is "hazard class"?
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A.
A grouping of materials by hazard type
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B.
A type of placard
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C.
A required driving license
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D.
A type of HazMat trailer
Correct answer: A.
There are nine hazard classes that group materials with similar dangers.
Question 17 of 25 · Loading
When loading or unloading HazMat:
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A.
Set the parking brake
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B.
Be sure the cargo is properly braced
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C.
Stay close to the vehicle
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D.
All of the above
Correct answer: D.
Keep the brakes set, secure cargo, and remain on alert during loading and unloading.
Question 18 of 25 · Emergencies
Drivers must report HazMat incidents to:
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A.
The local newspaper
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B.
Carrier and law enforcement, then the National Response Center
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C.
No one — drivers are not responsible
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D.
The shipper only
Correct answer: B.
Notify your carrier and local responders, then call the National Response Center if reportable.
Question 19 of 25 · Placards
Which of these is required if a vehicle's placards are missing or destroyed?
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A.
Placards must be replaced before continuing
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B.
Drivers can continue without placards
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C.
Drivers must call OSHA
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D.
Drivers must wait until next shipping point
Correct answer: A.
Replace missing or damaged placards immediately before continuing.
Question 20 of 25 · Security
Drivers should report any HazMat shipment that:
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A.
Appears to be tampered with
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B.
Has missing or damaged placards
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C.
Has a strong odor or evidence of leakage
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D.
All of the above
Correct answer: D.
Always report any sign of tampering, damaged placards, or leak evidence.
Question 21 of 25 · Emergencies
What is the first thing you should do if your HazMat load catches fire?
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A.
Pull over, away from buildings or vehicles, then call 911
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B.
Drive to the nearest hospital
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C.
Continue to destination
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D.
Try to put it out with snow
Correct answer: A.
Stop in a safe place, away from people and buildings, then notify emergency services.
Question 22 of 25 · Shipping Papers
Where must HazMat shipping papers be kept while loading or unloading?
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A.
In the cab only
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B.
On the dock with the cargo
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C.
On the seat of the cab or in a door pouch within reach
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D.
Locked in the glove box
Correct answer: C.
Papers must be readily accessible at all times during transport.
Question 23 of 25 · Hours of Service
Drivers transporting hazardous materials must keep a written record of duty status because:
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A.
It's a federal regulation for HazMat operations
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B.
Insurance requires it
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C.
It looks professional
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D.
Drivers don't need to keep records
Correct answer: A.
Federal hours-of-service rules apply to HazMat drivers as to other CMV drivers.
Question 24 of 25 · HazMat Basics
What's the most important reason for these regulations?
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A.
Public safety
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B.
Protect the environment
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C.
Protect the carrier
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D.
All of the above
Correct answer: D.
Regulations protect people, property, and the environment.
Question 25 of 25 · Placards
How are placards different from labels?
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A.
Labels go on packages; placards go on vehicles
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B.
Placards go on packages and labels go on vehicles
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C.
They are the same
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D.
Labels are only required outside the U.S.
Correct answer: A.
Labels mark individual packages; placards identify HazMat on vehicles.
About the Hazardous Materials Test
The Hazardous Materials (HazMat) test covers the rules for transporting materials that pose a risk to health, safety, and property. Topics include the hazardous materials table, shipping papers, marking, labeling, placarding, loading and unloading, bulk packaging, driving and parking rules, communications, emergencies, and hazardous materials regulations enforced by the U.S. Department of Transportation Pipeline and Hazardous Materials Safety Administration. A federal Transportation Security Administration (TSA) background check is also required.
The California Department of Motor Vehicles administers this knowledge test as part of its commercial driver license program. To earn the HazMat Endorsement (H) on your California CDL, you need to score at least 24 out of 30 on the official version.
Topics covered on this practice test
- Shipping Papers: 4 questions
- Placards: 4 questions
- HazMat Driving: 3 questions
- HazMat Basics: 3 questions
- Emergencies: 3 questions
- Tank Operations: 2 questions
- Security: 2 questions
- Parking: 1 question
- Inspection: 1 question
- Loading: 1 question
- Hours of Service: 1 question
How to use this practice test
- Read each question carefully. CDL questions are written precisely — small wording differences matter.
- Click "Show Answers & Explanations" only after answering every question. Don't peek mid-test.
- Read the explanation for every question, even ones you got right. The reasoning is more important than the answer.
- Repeat the test until you score 100%. The questions are deterministic per state, so you can track your improvement over multiple sessions.
- Move on to the other endorsement tests for California until you're ready for the official exam.
Tips specific to the Hazardous Materials test
HazMat is the longest knowledge test (30 questions) and adds a Transportation Security Administration (TSA) background check. Most candidates struggle with placard colors, the segregation table, shipping paper requirements, and emergency response procedures. Use the official Emergency Response Guidebook (ERG) alongside this practice set.