TheoryCDL HazMat Endorsement
Practice Test
Tackle hazardous materials placarding, loading rules, and emergency response. Focused practice for the H endorsement — one of the toughest CDL knowledge tests.
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CDL HazMat Endorsement exam — full Q&A walkthrough
Every question read aloud with the answer explained. Play it on your commute, then test yourself.
30 free CDL HazMat Endorsement questions
Sampled across every topic area — not just the first page. Try them as a quiz or flip them as flashcards.
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CDL HazMat Endorsement
What is the PRIMARY purpose of the federal Hazardous Materials Regulations (HMR) found in 49 CFR?
Correct — D. Per 49 CFR 171.1 and the FMCSA CDL Manual HazMat section, the HMR exist to communicate the risks of hazardous materials and to ensure those materials are properly contained — protecting drivers, the public, and emergency responders. -
CDL HazMat Endorsement
Under the federal HazMat regulations, which of the following individuals is ALWAYS required to comply when transporting hazardous materials in commerce?
Correct — A. 49 CFR 171.2 states that any person who offers for transport, accepts for transport, or transports hazardous materials in commerce must comply with the HMR, regardless of vehicle size or whether travel is intrastate or interstate. -
CDL HazMat Endorsement
A driver's shipping papers for a hazardous materials load must be kept where while the vehicle is being driven?
Correct — B. The FMCSA CDL Manual and 49 CFR 177.817 require that shipping papers be within the driver's immediate reach while driving, or in a pouch on the driver's door, so emergency responders can locate hazard information quickly. -
CDL HazMat Endorsement
How many placards must be displayed on a vehicle that requires placarding under the federal HMR?
Correct — D. 49 CFR 172.516 requires four placards — one on each side and one on each end (front and rear) — so the hazard class is visible from any approach direction. -
CDL HazMat Endorsement
A driver is hauling a mixed load of hazardous materials from different hazard classes. At what aggregate weight threshold must the driver add placards for Table 2 materials?
Correct — A. 49 CFR 172.504 requires placards for Table 2 hazardous materials when the aggregate gross weight of all such materials on the vehicle reaches 1,001 lbs or more; Table 1 materials require placards in any quantity. -
CDL HazMat Endorsement
Which statement BEST describes a CDL driver's personal responsibility under the HMR before moving a vehicle loaded with hazardous materials?
Correct — D. The FMCSA CDL Manual and 49 CFR 177.800 place responsibility on the driver to verify that shipping papers are correct, the vehicle is properly placarded, and the hazardous materials are safely loaded and packaged before moving the vehicle. -
CDL HazMat Endorsement
A driver notices that the shipping papers list a material as a hazardous substance but the package bears no required hazard label. What should the driver do?
Correct — B. 49 CFR 177.801 and the FMCSA CDL Manual state that a driver must not accept or transport a hazardous materials shipment that does not meet all regulatory requirements, including proper labeling — refusing the load is the correct action. -
CDL HazMat Endorsement
The Emergency Response Guidebook (ERG) is required to be carried on vehicles transporting hazardous materials primarily because it:
Correct — C. The ERG, referenced in the FMCSA CDL Manual HazMat section, gives drivers and emergency responders quick-reference information on the dangers of specific materials and recommended initial isolation and protective action distances during an incident. -
CDL HazMat Endorsement
A shipper tenders a drum of corrosive liquid and lists it on the shipping paper only by its trade name, with no proper DOT shipping name, hazard class, or UN identification number. Under the HMR, this shipment is:
Correct — B. 49 CFR 172.202 mandates that every hazardous materials entry on a shipping paper include the proper shipping name, hazard class or division, UN/NA identification number, and packing group — trade names alone never satisfy this requirement regardless of weight. -
CDL HazMat Endorsement
A carrier must file a written Hazardous Materials Incident Report (DOT Form F 5800.1) with the FMCSA when:
Correct — C. 49 CFR 171.16 requires carriers to submit DOT Form F 5800.1 within 30 days whenever a hazardous material is unintentionally released from its package during transportation in commerce, because an uncontained release directly defeats the HMR's goal of product containment. -
CDL HazMat Endorsement
Under 49 CFR, which situation correctly illustrates the regulatory concept that hazmat rules 'communicate risk' through the transport chain?
Correct — A. The FMCSA CDL Manual explains that the HMR create an integrated system — labels, placards, markings, and shipping papers — each layer communicating risk to handlers, drivers, enforcement officers, and emergency responders at every point in the transport chain, fulfilling 49 CFR 171.1's stated purpose. -
CDL HazMat Endorsement
Which hazard class covers materials that are capable of catching fire when exposed to a spark or flame at temperatures at or below 141°F (60.5°C)?
Correct — C. Under 49 CFR 173.120, Class 3 (Flammable Liquids) are liquids with a flash point at or below 60.5°C (141°F), distinguishing them from the higher flash-point combustible liquids and from solid or gaseous flammable materials in other classes. -
CDL HazMat Endorsement
A driver is hauling oxygen cylinders for industrial use. Under 49 CFR 173.115, compressed non-flammable gases such as oxygen fall under which hazard class and division?
Correct — B. 49 CFR 173.115 defines Division 2.2 as non-flammable, non-poisonous compressed gases; oxygen in cylinders meets this definition even though it supports combustion, because the gas itself does not ignite. -
CDL HazMat Endorsement
According to the FMCSA CDL manual, how many sides of the vehicle must display the correct hazmat placards?
Correct — B. The FMCSA CDL Hazardous Materials section and 49 CFR 172.516 require that placards be placed on all four sides of the vehicle so they are visible from any direction of approach. -
CDL HazMat Endorsement
Which of the following best describes Class 1 hazardous materials under 49 CFR 173.50?
Correct — A. 49 CFR 173.50 defines Class 1 (Explosives) as any substance or article designed to produce an explosion or rapid release of gas and heat through chemical reaction, covering Divisions 1.1 through 1.6. -
CDL HazMat Endorsement
A shipment of sodium metal reacts violently when it contacts water and ignites spontaneously in moist air. Under 49 CFR 173.124, this material is most accurately classified as:
Correct — A. 49 CFR 173.124 defines Division 4.3 (Dangerous When Wet) as materials that, on contact with water, become spontaneously flammable or emit flammable or toxic gases — sodium's violent water reaction places it squarely in this division. -
CDL HazMat Endorsement
Under 49 CFR 172.504, a driver is required to display hazmat placards when the aggregate gross weight of materials in any single hazard class reaches what threshold?
Correct — D. 49 CFR 172.504(c) sets the general placard threshold at 1,001 lbs (454 kg) aggregate gross weight for Table 2 materials in any single hazard class; certain Table 1 materials (like explosives) require placarding in any quantity. -
CDL HazMat Endorsement
Hydrogen peroxide solution at 52% concentration by mass is classified under 49 CFR 173.128 as which division?
Correct — D. 49 CFR 173.128 places inorganic peroxides such as hydrogen peroxide solutions with oxidizing properties in Division 5.1 (Oxidizers); organic peroxides in Division 5.2 are carbon-based compounds, which hydrogen peroxide is not. -
CDL HazMat Endorsement
A cargo tank is loaded with a material bearing the Class 7 placard. According to the FMCSA CDL manual, what is the primary hazard associated with Class 7 materials?
Correct — D. Class 7 (Radioactive) materials, as defined in 49 CFR 173.403, are substances whose specific activity exceeds 70 Bq/g and which emit ionizing radiation (alpha, beta, gamma, or neutron) that poses a direct health and equipment hazard. -
CDL HazMat Endorsement
While reviewing shipping papers, a driver notices a material listed as a Division 6.1, Packing Group I substance. Under 49 CFR 173.132, this means the material:
Correct — B. 49 CFR 173.132 defines Division 6.1 as poisonous/toxic materials; Packing Group I denotes the highest hazard level — substances with oral, dermal, or inhalation LC50/LD50 values indicating severe acute toxicity that could be fatal. -
CDL HazMat Endorsement
Under 49 CFR 173.136, a substance is classified as Class 8 (Corrosive) based on its ability to cause what specific effect?
Correct — A. 49 CFR 173.136 defines Class 8 corrosives as liquids or solids that cause full-thickness destruction of intact skin tissue within a set observation period, or that show a corrosion rate on steel or aluminum exceeding 6.25 mm per year at 55°C in standardized testing. -
CDL HazMat Endorsement
A driver is transporting a material labeled as Class 9 (Miscellaneous Hazardous Material). According to 49 CFR 173.155, which of the following is the MOST accurate description of Class 9?
Correct — B. 49 CFR 173.155 defines Class 9 (Miscellaneous) as materials that present a hazard during transport that is not covered by Classes 1–8, including lithium batteries, dry ice, elevated-temperature materials, magnetized materials, and marine pollutants — all of which require the Class 9 placard when thresholds are met. -
CDL HazMat Endorsement
Where must a commercial motor vehicle driver keep shipping papers for hazardous materials while driving?
Correct — A. Under 49 CFR 177.817(e), shipping papers must be within the driver's reach while the seat belt is fastened, or in a pouch on the driver's door, so they are immediately accessible for inspection or emergency response. -
CDL HazMat Endorsement
Which of the following pieces of information is NOT required to appear on a shipping paper for a hazardous material?
Correct — D. 49 CFR 172.202 requires the proper shipping name, hazard class or division, identification number, and packing group on shipping papers, but financial data such as profit margin has no regulatory basis and is never required. -
CDL HazMat Endorsement
What is the correct order of the basic description on a hazardous materials shipping paper when listing a single hazardous material entry?
Correct — D. 49 CFR 172.202(a) specifies that the basic description must appear in this sequence: identification number, proper shipping name, hazard class or division, and packing group — in that exact order. -
CDL HazMat Endorsement
When a vehicle is not attended by the driver, where must shipping papers for hazardous materials be kept?
Correct — D. Per 49 CFR 177.817(e), when the driver is not in the vehicle the shipping papers must be in a holder on the inside of the driver's door or on the driver's seat so emergency responders can find them quickly. -
CDL HazMat Endorsement
A driver is transporting a mix of hazardous and non-hazardous materials on the same bill of lading. How must the hazardous materials entries be identified so they stand out from the non-hazardous entries?
Correct — C. 49 CFR 172.201(a)(1) requires that hazardous materials entries on a mixed shipping paper be distinguished from non-hazardous entries by highlighting, an identifying color, an asterisk, or by being listed before all non-hazardous entries. -
CDL HazMat Endorsement
A shipper prepares a shipping paper for 'Flammable Liquid, n.o.s.' containing toluene and xylene. Which additional requirement applies to this n.o.s. entry?
Correct — A. Under 49 CFR 172.203(k), for n.o.s. and other generic proper shipping names, the technical names of at least two constituents most predominately contributing to the hazard must be entered in parentheses in association with the basic description. -
CDL HazMat Endorsement
Which statement correctly describes the shipper's certification that must appear on a hazardous materials shipping paper?
Correct — C. 49 CFR 172.204(a) requires the offeror (shipper) to sign a certification stating that the hazardous material is properly classified, described, packaged, marked, and labeled, and is in proper condition for transportation in accordance with applicable regulations. -
CDL HazMat Endorsement
A driver picks up a shipment of Division 2.1 (flammable gas) and later adds a stop with a non-hazardous freight pickup. The new bill of lading does not list any hazardous materials. What must the driver do regarding the original hazardous materials shipping papers?
Correct — B. 49 CFR 177.817 requires that shipping papers accompany the hazardous materials for the entire trip; adding non-hazardous freight does not eliminate the obligation to retain and keep accessible the original hazardous materials shipping papers.
CDL HazMat Endorsement sample questions
Tap any question below to reveal the answer and a plain-English explanation.
CDL HazMat Endorsement Where must a commercial motor vehicle driver keep shipping papers for hazardous materials while driving?
A. Within reach while the driver's seat belt is fastened, or in a pouch on the driver's door ✓
B. In the glove compartment or locked storage box
C. Filed with the motor carrier's dispatcher before departure
D. Attached to the outside of the cargo door nearest the load
Correct — A. Under 49 CFR 177.817(e), shipping papers must be within the driver's reach while the seat belt is fastened, or in a pouch on the driver's door, so they are immediately accessible for inspection or emergency response.
CDL HazMat Endorsement Which of the following pieces of information is NOT required to appear on a shipping paper for a hazardous material?
A. The UN or NA identification number
B. The proper shipping name
C. The hazard class or division number
D. The shipper's net profit margin for the shipment ✓
Correct — D. 49 CFR 172.202 requires the proper shipping name, hazard class or division, identification number, and packing group on shipping papers, but financial data such as profit margin has no regulatory basis and is never required.
CDL HazMat Endorsement What is the correct order of the basic description on a hazardous materials shipping paper when listing a single hazardous material entry?
A. Packing group, proper shipping name, ID number, hazard class
B. Proper shipping name, hazard class, ID number, packing group
C. Hazard class, ID number, proper shipping name, packing group
D. ID number, proper shipping name, hazard class, packing group ✓
Correct — D. 49 CFR 172.202(a) specifies that the basic description must appear in this sequence: identification number, proper shipping name, hazard class or division, and packing group — in that exact order.
CDL HazMat Endorsement When a vehicle is not attended by the driver, where must shipping papers for hazardous materials be kept?
A. Locked inside the vehicle cab at all times
B. Visible from outside the vehicle through the windshield
C. Attached to the cargo trailer's exterior in a weatherproof sleeve
D. In a pouch on the driver's door or on the driver's seat ✓
Correct — D. Per 49 CFR 177.817(e), when the driver is not in the vehicle the shipping papers must be in a holder on the inside of the driver's door or on the driver's seat so emergency responders can find them quickly.
CDL HazMat Endorsement A driver is transporting a mix of hazardous and non-hazardous materials on the same bill of lading. How must the hazardous materials entries be identified so they stand out from the non-hazardous entries?
A. They must be entered in a different font size that is at least twice as large
B. They must carry the shipper's USDOT registration number printed next to each entry
C. They must be highlighted in a contrasting color, asterisked, or entered before all non-hazardous entries ✓
D. They must appear on a completely separate document from the non-hazardous items
Correct — C. 49 CFR 172.201(a)(1) requires that hazardous materials entries on a mixed shipping paper be distinguished from non-hazardous entries by highlighting, an identifying color, an asterisk, or by being listed before all non-hazardous entries.
CDL HazMat Endorsement A shipper prepares a shipping paper for 'Flammable Liquid, n.o.s.' containing toluene and xylene. Which additional requirement applies to this n.o.s. entry?
A. The technical names of at least the two most hazardous constituents must appear in parentheses after the proper shipping name ✓
B. The packing group may be omitted since the entry is already listed as n.o.s.
C. The flash point in degrees Fahrenheit must be printed immediately after the hazard class
D. The shipper must attach a Material Safety Data Sheet in place of the standard description
Correct — A. Under 49 CFR 172.203(k), for n.o.s. and other generic proper shipping names, the technical names of at least two constituents most predominately contributing to the hazard must be entered in parentheses in association with the basic description.
CDL HazMat Endorsement Which statement correctly describes the shipper's certification that must appear on a hazardous materials shipping paper?
A. It must be signed by the receiving carrier's terminal manager upon acceptance of the freight
B. It must be notarized by a state-licensed official before the shipment may move in interstate commerce
C. It declares that the shipper has prepared the shipment in proper condition per applicable regulations and that the material is properly classified, described, packaged, marked, and labeled ✓
D. It is only required for Class 1 explosives and Class 7 radioactive materials
Correct — C. 49 CFR 172.204(a) requires the offeror (shipper) to sign a certification stating that the hazardous material is properly classified, described, packaged, marked, and labeled, and is in proper condition for transportation in accordance with applicable regulations.
CDL HazMat Endorsement A driver picks up a shipment of Division 2.1 (flammable gas) and later adds a stop with a non-hazardous freight pickup. The new bill of lading does not list any hazardous materials. What must the driver do regarding the original hazardous materials shipping papers?
A. Discard the old papers since the newer bill of lading supersedes them
B. Retain the original hazardous materials shipping papers and keep them accessible throughout the trip ✓
C. Transfer the hazardous materials description onto the new bill of lading and destroy the original
D. Forward the original papers to the next carrier by fax before departing the new pickup location
Correct — B. 49 CFR 177.817 requires that shipping papers accompany the hazardous materials for the entire trip; adding non-hazardous freight does not eliminate the obligation to retain and keep accessible the original hazardous materials shipping papers.
About the CDL HazMat Endorsement test
Study for the US CDL Hazardous Materials (HazMat) endorsement knowledge test. Original practice questions written from the publicly available FMCSA CDL manual and the federal Hazardous Materials Regulations (49 CFR), with a clear explanation for every answer.
What you get
- The 9 hazard classes and divisions, shipping papers, placarding rules, loading and segregation, bulk packaging and cargo tanks, driving and parking rules, emergencies and the Emergency Response Guidebook, and HazMat security.
- A clear explanation citing the rule for every question.
- Timed practice tests that mirror the real endorsement test.
Original & safe
Every question is written for this app from the public CDL manual and federal regulations. Nothing is copied from any real state exam, test pool or third-party question bank.
You will be tested on
- Road signs, signals and markings
- Right-of-way and intersection rules
- Speed, stopping distances and safe following
- Hazard perception and defensive driving
How TheoryPractice helps you pass
- Real exam-style questions with instant, detailed explanations
- Full timed mock exams that mirror the real test format
- Flashcards & quiz modes from the same question bank
- Progress tracking so you know exactly when you're ready
Topics in this question bank
Road signs, signals and markings
Right-of-way and intersection rules
Speed, stopping distances and safe following
Hazard perception and defensive driving
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