CDL Hazmat Practice Test
This is a free 15-question sampler for the CDL hazmat endorsement, written by the StudyPDF team. It covers the hazardous materials table, the nine hazard classes, shipping papers, placards, labels and markings, loading and segregation, parking and attendance, railroad crossings, emergencies and the security side, mixing multiple choice, select all that apply and fill in the blank. Answer all 15 questions, then check your score and read the explanation for every question.
Who signs the certification on the shipping paper stating that a hazardous material is properly classed, described, packaged, marked and labeled?
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All 15 questions at a glance
Prefer to read before you play? Every question in the sampler is listed below. Answers and explanations stay collapsed until you open them.
1. Who signs the certification on the shipping paper stating that a hazardous material is properly classed, described, packaged, marked and labeled?
- A. The driver who picks up the load
- B. The state agency that issued the endorsement
- C. The shipper who offers the material
- D. The consignee who receives the load
Show answer and explanation
Answer: C. The shipper who offers the material
The shipper classifies the material, chooses the proper shipping name, packages it, marks and labels the packages and signs the certification on the paper. The carrier is responsible for the vehicle, the placards and safe transport, and the driver has to refuse a package that is leaking or a paper that does not match the freight. All three share the job, but the certification is the shipper's word.
2. In the hazardous materials table, which column tells you the hazard class or division of a material?
- A. Column 1
- B. Column 3
- C. Column 5
- D. Column 8
Show answer and explanation
Answer: B. Column 3
Column 1 holds the symbols, Column 2 is the proper shipping name, Column 3 is the hazard class or division, Column 4 is the identification number and Column 5 is the packing group. Reading across a row in that order is how you build a correct shipping description. Names printed in italics in Column 2 are not proper shipping names, so never copy one onto a paper.
3. A four inch diamond attached to a package, rather than to the vehicle, is called:
- A. A placard
- B. A marking
- C. An orange panel
- D. A label
Show answer and explanation
Answer: D. A label
Labels go on packages and are about four inches on a side. Placards go on the vehicle or on a bulk package, are much larger at around ten and three quarter inches, and are what a responder reads from a distance. Markings are a third thing again: the printed words and numbers on the package itself, usually the proper shipping name and the identification number.
4. You step out of the truck at a fuel island. Where do the hazmat shipping papers have to be?
- A. Folded in your wallet so they stay with you
- B. In a holder mounted inside the driver's door, or on the driver's seat
- C. Locked in the trailer with the freight
- D. Anywhere in the cab, as long as you can find them
Show answer and explanation
Answer: B. In a holder mounted inside the driver's door, or on the driver's seat
When you are away from the controls the papers must be in the driver's door holder or lying on the driver's seat, so anyone who opens that door finds them at once. When you are behind the wheel with the belt on, they must be within your immediate reach and either visible to a person stepping into the cab or in that same door holder. They also have to be tabbed or sitting on top of your other paperwork so nobody has to dig.
5. When a load requires placards, how many go on the vehicle and where?
- A. One, on the rear
- B. Two, one on each side
- C. Four, one on each side and one on each end
- D. Six, three on each side
Show answer and explanation
Answer: C. Four, one on each side and one on each end
Placards go on each side and each end, which is four on a single vehicle, so the load can be identified from any direction. They have to be readable, kept clear of other markings that could be confused with them, and fastened so they will not blow off. If the trailer has placard boards, that is where they belong.
6. A crash involving your placarded load sends a bystander to the hospital because of the material. Who must be called, and how soon?
- A. The National Response Center, as soon as practical and no later than 12 hours
- B. The shipper only, within 30 days
- C. Your dispatcher only, at the end of the shift
- D. Nobody, as long as a written report is mailed later
Show answer and explanation
Answer: A. The National Response Center, as soon as practical and no later than 12 hours
Certain incidents trigger an immediate telephone report to the National Response Center at 800-424-8802, including a death, a hospital admission caused by the material, an evacuation lasting an hour or more, or a major road closed for an hour or more. That call does not replace the written report that follows it. Your first job on scene is still to keep people back, warn them of the danger, and hand responders the shipping papers and the emergency response information that goes with them.
7. A placarded vehicle counts as attended when the person in charge is:
- A. Somewhere on the same property
- B. Asleep in the sleeper berth of the same truck
- C. Within a mile and reachable by phone
- D. Within 100 feet of the vehicle with an unobstructed view of it, awake and out of the sleeper berth
Show answer and explanation
Answer: D. Within 100 feet of the vehicle with an unobstructed view of it, awake and out of the sleeper berth
Attending means you can actually see the vehicle and do something about it, which is why the rule is 100 feet, a clear line of sight, awake and out of the bunk. A vehicle carrying Division 1.1, 1.2 or 1.3 explosives must be attended at all times unless it sits in an approved safe haven or on carrier, shipper or consignee property. Other placarded loads must be attended whenever they are parked on a public street, highway or shoulder.
8. How does a placarded vehicle have to handle a railroad grade crossing?
- A. Stop between 15 and 50 feet from the nearest rail, look and listen, then cross without changing gears
- B. Slow to 15 miles per hour and cross without stopping
- C. Stop within 5 feet of the nearest rail so you can see down the track
- D. No stop is needed if the crossing has lights and gates
Show answer and explanation
Answer: A. Stop between 15 and 50 feet from the nearest rail, look and listen, then cross without changing gears
The stop has to be close enough to see down the track but far enough back to survive a mistake, which is where the 15 to 50 foot window comes from. Pick your gear before you start across and stay in it, because a missed shift on the rails is how vehicles get stranded. A stop is not required at an exempt or industrial switching crossing, or when an officer or a green traffic signal is moving you through.
9. Before a state can issue or renew a hazmat endorsement, the driver must:
- A. Hold a CDL for at least five years
- B. Clear a TSA security threat assessment, including fingerprints, and pass the hazmat knowledge test
- C. Get written permission from every shipper on the route
- D. Pass a skills test in a placarded tank vehicle
Show answer and explanation
Answer: B. Clear a TSA security threat assessment, including fingerprints, and pass the hazmat knowledge test
A state may not issue or renew the H endorsement until TSA returns a Determination of No Security Threat, and the knowledge test has to be passed again at renewal. The threat assessment runs on a renewal cycle that cannot exceed five years, and it does not simply follow you around: if you move your CDL to a new state, that state honors the time left from the old assessment and then requires a fresh one. A first time hazmat applicant must also complete entry level driver training from a registered provider before taking the knowledge test.
10. Which of these hazard class numbers are matched with the right kind of material?
Select all that apply.
- A. Class 1 is explosives
- B. Class 4 is radioactive material
- C. Class 7 is corrosives
- D. Class 8 is corrosives
- E. Class 5 is oxidizers and organic peroxides
- F. Class 6 is miscellaneous hazardous materials
Show answer and explanation
Answer: A. Class 1 is explosives, D. Class 8 is corrosives, E. Class 5 is oxidizers and organic peroxides
The nine classes run in order: 1 explosives, 2 gases, 3 flammable liquids, 4 flammable solids and materials that ignite on their own or react with water, 5 oxidizers and organic peroxides, 6 poisons and infectious substances, 7 radioactive, 8 corrosives, 9 miscellaneous. Learn them as a numbered list, because the table, the labels, the placards and the segregation rules all key off the same numbers. Class 9 is the catch all for materials that are regulated but do not fit any of the other eight.
11. Which of these require placards no matter how small the amount on board?
Select all that apply.
- A. Division 1.2 explosives
- B. Class 3 flammable liquids
- C. Division 2.3 poison gas
- D. Division 4.3 dangerous when wet
- E. Class 8 corrosives
- F. Class 9 miscellaneous hazardous materials
Show answer and explanation
Answer: A. Division 1.2 explosives, C. Division 2.3 poison gas, D. Division 4.3 dangerous when wet
The placarding rules split materials into two tables. Table 1 holds the categories treated as most dangerous, including Divisions 1.1, 1.2 and 1.3, poison gas, dangerous when wet, temperature controlled organic peroxide type B, materials poisonous by inhalation and Radioactive Yellow III, and any amount of them calls for placards. Table 2 covers everything else and only triggers placards at 1,001 pounds or more. The Class 9 placard is not required at all for transportation inside the United States, although a bulk package still has to show its identification number.
12. Which of the following are required when you load or unload a placarded vehicle?
Select all that apply.
- A. Nobody may smoke or carry a lighted cigarette within 25 feet of a vehicle carrying explosives, oxidizers, flammable gas, flammable liquid or flammable solids
- B. The engine must be shut off while Class 1 explosives are loaded or unloaded
- C. Packages must be braced so they cannot shift, fall or be damaged while the vehicle moves
- D. A leaking package may be loaded as long as it goes at the rear of the trailer where you can watch it
- E. A package bearing a POISON label may ride beside cartons of food as long as nothing is stacked on the food
Show answer and explanation
Answer: A. Nobody may smoke or carry a lighted cigarette within 25 feet of a vehicle carrying explosives, oxidizers, flammable gas, flammable liquid or flammable solids, B. The engine must be shut off while Class 1 explosives are loaded or unloaded, C. Packages must be braced so they cannot shift, fall or be damaged while the vehicle moves
Ignition sources and hazmat do not mix, which is what the 25 foot smoking rule and the engine off rule for explosives are both about. Securing the load is more than cargo care here, because a package that slides and splits turns a routine trip into a spill. You never accept a leaking package, and poison labeled packages may not travel with food or animal feed unless they are packaged and overpacked exactly the way the segregation rules allow.
13. Complete the sentence.
On a shipping paper the basic description must run as one unbroken sequence with nothing mixed in: _____, then the proper shipping name, then the hazard class or division, then the packing group.
Options for blank 1: the identification number, the total quantity, the emergency response telephone number, the shipper certification
Show answer and explanation
Answer: the identification number
Under the current rules the identification number comes first, so a description reads like UN1203, Gasoline, 3, PG II. Older study guides put the proper shipping name first, which is a good reason to work from a current manual rather than one that has been in the truck for a decade. Quantity, the emergency response phone number and the shipper certification all belong on the paper too, but they sit outside the basic description, not inside it.
14. Complete the sentence.
Materials in Table 2 of the placarding rules only require placards once the vehicle carries _____ or more aggregate gross weight of them.
Options for blank 1: 454 pounds, 1,001 pounds, 2,205 pounds, 10,001 pounds
Show answer and explanation
Answer: 1,001 pounds
1,001 pounds is 454 kilograms, and it is the combined gross weight of all Table 2 hazmat on board including the packaging, not the weight of one product. When two or more Table 2 categories are aboard you may use a single DANGEROUS placard instead of separate ones, but if 2,205 pounds or more of one category is loaded at one facility, that category gets its own placard. Bulk packages and materials with their own placarding rules sit outside this exception.
15. Complete the sentence.
A vehicle carrying Division 1.1, 1.2 or 1.3 explosives must not be parked within _____ of a bridge, tunnel, dwelling or a place where people work or gather, except for brief periods when the job leaves no other choice.
Options for blank 1: 50 feet, 100 feet, 300 feet, half a mile
Show answer and explanation
Answer: 300 feet
The 300 foot rule is about blast radius, so it applies to explosives rather than to placarded loads in general. Any hazmat load, explosive or not, must also stay at least 5 feet off the traveled portion of a public street or highway except for brief stops the job requires. Parking explosives on private property takes the knowledge and consent of whoever is in charge of that property, and they have to know what you are carrying.
What the hazmat endorsement test covers
The hazmat endorsement, the H on your CDL, is not a separate license. You add it to a commercial driver's license you already hold or are applying for, and it takes two things: a knowledge test and a security clearance. The clearance is a TSA security threat assessment that includes fingerprints and a background check, and your state cannot issue or renew the endorsement until TSA returns a Determination of No Security Threat. Since February 2022 a first time hazmat applicant also has to complete entry level driver training with a provider listed on the federal Training Provider Registry before sitting the knowledge test. The fee, the number of questions, the passing score and how soon you can retake it are set by your state, so the only numbers worth trusting are the ones in your own state CDL manual.
The material itself is federal. It comes from the hazardous materials regulations in 49 CFR parts 100 through 185, which are public and free to read. Expect questions on what makes a material hazardous and who is responsible for what, how to read the hazardous materials table, the nine hazard classes, what has to appear on a shipping paper and where that paper must be kept, when placards are required and how many, labels and markings on packages, loading and segregation rules, attendance and parking, driving rules such as railroad crossings and route and tunnel restrictions, what to do at an incident, and the security plan and security awareness training your employer has to provide.
Hazmat rules change. Parts 100 through 185 are amended regularly, and details that used to appear in every study guide have since been rewritten, including the order of the basic description on a shipping paper. Study the current CDL manual your state publishes, and when a number really matters, check it against the current regulation instead of a handbook that has been riding in the truck for years. Every figure on this page was checked against the regulations when it was written, but you are responsible for the version in force on the day you test and on the day you drive.
How to use this sampler
These 15 questions go after the reasoning behind the rules rather than pure recall. They ask why the shipping papers live in the door pouch, why the smoking rule is measured in feet, why a Table 1 material needs placards at any weight while a Table 2 material does not, and what your first move is at a wreck. Hazmat looks like a pile of unrelated numbers until you see the logic under it, and once you do, most of that pile stops needing memorization. The 300 foot rule is a blast radius. The 25 foot smoking rule is an ignition distance. The door pouch is the first place a firefighter looks. A rule you can explain is a rule you still have on the day a dock worker hands you a paper that does not match what is going on the trailer.
Take it in one sitting with no book open, then read every explanation, including the ones you got right. Treat a wrong answer as a topic rather than a fact. If you missed the placarding question and the 1,001 pound question, review the two placarding tables side by side, because they are one idea seen from two directions. If you missed the shipping paper questions, go sit in a truck and put the papers where they belong until it is muscle memory rather than something you recite. The areas that catch people out most often are the placarding thresholds, the segregation rules and the split between what the shipper owes you and what you owe the shipper, so give those an extra pass.
This sampler covers hazmat only, so it is not a full study plan. The hazmat knowledge test is one of several you may need, and the general knowledge test is required for every CDL, so run the sibling quizzes linked below and compare where you drop points. Read the parts this sampler does not test as well, including route and tunnel restrictions, the tire check you owe at the start of a trip and every time you park, cargo heaters, and the security plan and security awareness training your employer has to provide. Nothing on this page is a real exam question, and no practice test can promise you a pass. What a sampler can do is tell you which chapter to open next.
How StudyPDF builds full practice tests from your own material
Fifteen questions can find your weak spots. They cannot get you ready on their own, and a generic hazmat bank will not match the emphasis of your state's CDL manual or your carrier's own training packet. Hazmat also moves. The regulations are amended regularly, and a question bank written years ago can quietly teach you something that stopped being true, which matters more here than on most tests, because a wrong answer about a placard does not stay on paper. The safest thing to study from is the current document you were actually handed, and the safest way to practice is to be tested on that document rather than on somebody else's summary of it.
StudyPDF works from your material instead. You upload the hazmat section of your state CDL manual, your company's hazmat training handout or the pages of 49 CFR your instructor assigned, and Bo, the study agent, builds full length practice tests from those exact pages. Every question is grounded in what you uploaded and every explanation points back to the page it came from, so when an answer looks wrong you can check the source in seconds instead of arguing with a black box. You can regenerate a fresh test as often as you like and narrow one to a single area such as placarding or segregation, and Bo tracks which topics you keep missing, so the next session starts where you are weakest instead of at the front of the book.
You do not need a document to begin. If you have nothing to upload, name a topic instead, for example placarding rules, the nine hazard classes or what belongs on a shipping paper, and Bo writes a practice test from that. That is the faster way in if you are still waiting on a manual or you just want to see whether the format suits you, and you can add your own files later and keep everything in the same course. Flashcards, a study guide and a summary come out of the same material if you would rather read before you get tested. Starting is free.
Written by the StudyPDF team. Last updated 2026-08-19.