Missouri Hazardous Materials CDL Practice Test
Below are 25 exam-style questions for the Missouri Hazardous Materials CDL knowledge test, modeled on the FMCSA-aligned content used by the Missouri Department of Revenue. Try to answer each question on your own before reading the answer key directly under it. The questions and answer choices are shuffled deterministically per state and endorsement, so the order will stay the same on repeat visits — that lets you genuinely measure your improvement.
- A Drive the vehicle to a safe place
- B Stay upwind, evacuate the area, and let trained responders handle it
- C Try to put it out with water
- D Open the cargo doors to ventilate
- A A barcode only
- B UN or NA followed by four digits
- C A state two-letter code
- D A serial number
- A Drivers, not cargo
- B All hazmat materials
- C Cargo tank vehicles only
- D Class 1 explosives, to determine which can be loaded together
- A At 50 and 100 feet
- B Only at night
- C Within 10 feet only
- D At 10, 100, and 200 feet from the vehicle
- A Price only
- B Proper shipping name, hazard class, ID number, and required emergency information
- C Color of packaging
- D Driver's name
- A Twelve
- B Seven
- C Nine
- D Five
- A Cause a leak or spill if the package is damaged
- B All of the above
- C Strike emergency exits
- D Move and obstruct visibility
- A A document describing all hazardous materials being carried
- B The number of cars
- C The train's schedule
- D The train's crew
- A Continue and report at the next stop
- B Stop, isolate the area, notify emergency services and the carrier
- C Open the container to inspect
- D Drive to the destination quickly
- A Cargo securement straps
- B A medical card
- C A logbook
- D An expired permit or shipper certification missing
- A Truck designed for the specific class
- B Vehicle in compliance with HMR
- C Properly placarded trailer
- D Vehicle without working brake lights or in unsafe condition
- A Mailed to the destination
- B Within reach of the driver while seated and within reach when the driver is out of the cab
- C Stored in the trailer
- D Filed in the cab's glove box
- A When the brakes feel different
- B Only at the destination
- C At each stop
- D Only at the start of the trip
- A Containers can rub against each other
- B They can shift freely
- C Cargo blocks emergency exits
- D Cargo cannot shift, leak, or be exposed to ignition sources
- A One
- B Four (one on each side and one on each end)
- C Two
- D Six
- A All of the above
- B Renew the TSA assessment periodically
- C Pass a TSA security threat assessment including fingerprinting
- D Notify the carrier of any incident
- A Avoid weigh stations
- B Have a written route plan if required by the shipper or by federal/state rules
- C Drive at night only
- D Take the most direct route regardless of restrictions
- A X (combination of H and N for tank vehicles carrying hazardous materials)
- B A medical card upgrade
- C A separate trailer license
- D A pilot car
- A Once per year by federal officials
- B Before each trip and at every stop
- C When the tank is full
- D Annually only
- A The shipper guarantees the load is properly classified, packaged, marked, labeled, and described per regulations
- B The driver has training
- C The carrier has insurance
- D The receiver has paid
- A At the start of each trip and each time they stop
- B Once a week
- C Never; tires are the carrier's responsibility
- D Only at the start and end
- A Tunnels marked as prohibited for hazmat
- B All of the above
- C Routes prohibited for hazmat
- D Driving over a railroad-highway grade crossing without stopping (most placarded loads)
- A Within 300 feet of a tunnel, bridge, or building used by the public, except for short rest stops
- B In a designated truck stop
- C On a public street within 5 feet of the road
- D In any rest area
- A Only liquids
- B Bulk quantities or any amount of certain Table 1 materials
- C Only at night
- D Any quantity of any hazardous material
- A A pallet
- B One that has more than 119 gallons capacity (liquids) or more than 882 lbs (solids)
- C Any package over 1 lb
- D Cardboard boxes only
Study tips for the Missouri Hazardous Materials exam
The Hazardous Materials portion of the Missouri CDL exam is graded out of the bank of questions the Missouri Department of Revenue draws from each year. While the exact bank is not published, every question is sourced from the Hazardous Materials chapter of the Missouri CDL handbook, which itself is derived from the FMCSA Model Commercial Driver's License Manual. That means studying our practice tests, reading the corresponding handbook chapter, and re-reading the parts you got wrong is genuinely the most efficient route to a first-time pass.
Most successful applicants follow a simple cycle: take the practice test cold, write down every question you missed, open the matching chapter of the official Missouri handbook, re-read the section that contains the right answer, then re-take the practice test 24 to 48 hours later. The 24-hour delay matters — sleep is when your brain commits new information to long-term memory, and CDL knowledge questions reward that kind of consolidated learning rather than cramming.
Pay particular attention to questions that include qualifier words like always, never, only, primary, or most. CDL test writers love to flip the right answer with a single qualifier. When two answer choices look almost identical, pay attention to the verb (is it must, should, or may?) and to any numbers (14 days, 100 air miles, 8 hours, 70/8 split). On endorsement tests in particular, watch for trick framing where a true statement about a different endorsement is offered as the "correct" answer to a question that is actually about Hazardous Materials.
Test-day logistics matter too. Bring photo ID, your Social Security card or birth certificate, your medical examiner's certificate (DOT card), and proof of state residency if you haven't already submitted those documents. The Missouri Department of Revenue will not let you sit for the knowledge exam without your documentation, and most offices charge an additional fee for re-attempts. Arrive early — the wait at most CDL testing offices runs 30 to 60 minutes — and silence your phone before the exam begins.
Finally, keep your General Knowledge fundamentals sharp even when you're focused on the Hazardous Materials exam. Many states administer multiple knowledge tests in a single sitting, and questions on weight definitions (GVWR, GCWR, GAWR), stopping distance, and the pre-trip inspection routine show up across endorsements. If you're unsure on the basics, sit a fresh Missouri General Knowledge practice test before scheduling the real exam.
Next steps
Missed more than four questions? Re-read the Hazardous Materials study guide and the matching chapter in the official Missouri CDL handbook. Then come back and re-take the test. Once you can score 22 of 25 or higher on three runs in a row, you're in good shape to schedule the real exam at your local Missouri Department of Revenue office.
Already comfortable with this endorsement? Drill another: MO General Knowledge · MO Air Brakes · MO Combination Vehicles · MO Passenger · MO School Bus · MO Tank Vehicle · MO Doubles / Triples
New to the CDL process in Missouri? Read How to apply for a CDL in Missouri for the document checklist and step-by-step timeline.