Ohio Hazardous Materials CDL Practice Test
Below are 25 exam-style questions for the Ohio Hazardous Materials CDL knowledge test, modeled on the FMCSA-aligned content used by the Ohio Bureau of Motor Vehicles. 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 Strike emergency exits
- B Cause a leak or spill if the package is damaged
- C All of the above
- D Move and obstruct visibility
- A At 50 and 100 feet
- B At 10, 100, and 200 feet from the vehicle
- C Only at night
- D Within 10 feet only
- A On a public street within 5 feet of the road
- B In a designated truck stop
- C Within 300 feet of a tunnel, bridge, or building used by the public, except for short rest stops
- D In any rest area
- A Hazardous waste only
- B Bulk shipments
- C Cargo that may be harmful to aquatic life and requires special marking
- D Only liquids in port areas
- A A pallet
- B Any package over 1 lb
- C Cardboard boxes only
- D One that has more than 119 gallons capacity (liquids) or more than 882 lbs (solids)
- A Must meet special standards or be turned off
- B May only be used after 6 p.m.
- C Are unrestricted
- D Must be operated by the receiver
- A The receiver has paid
- B The shipper guarantees the load is properly classified, packaged, marked, labeled, and described per regulations
- C The carrier has insurance
- D The driver has training
- A Mailed to the receiver
- B Only required for explosives
- C Carried in the trailer
- D Carried in the cab and used by responders to look up immediate response information for hazmat
- A The driver must be at the fueling control
- B Engine must be off
- C No smoking within 25 feet
- D All of the above
- A Open the container to inspect
- B Stop, isolate the area, notify emergency services and the carrier
- C Continue and report at the next stop
- D Drive to the destination quickly
- A Be in a low gear
- B Be attended by the driver
- C Be locked
- D Have a flashing light on
- A Contact the carrier safety officer
- B All of the above
- C Refer to the ERG
- D Refer to 49 CFR Parts 100-185 (HMR)
- A They can shift freely
- B Cargo cannot shift, leak, or be exposed to ignition sources
- C Containers can rub against each other
- D Cargo blocks emergency exits
- A The receiver
- B The shipper
- C The carrier and the driver
- D The state DMV
- A Notify the carrier of any incident
- B Pass a TSA security threat assessment including fingerprinting
- C All of the above
- D Renew the TSA assessment periodically
- A Bonded and grounded during loading and unloading
- B Loaded only at night
- C Loaded only by the receiver
- D Inspected once a year only
- A Notify the National Response Center if the load is leaking or hazmat-related
- B All of the above
- C Provide the responding officers with the shipping papers and ERG
- D Notify the carrier immediately
- A Only on Class 1 explosives
- B Any single placard
- C Two or more separate placards on a load that contains different hazard classes (Table 2 materials only)
- D Never
- A A medical card upgrade
- B A pilot car
- C A separate trailer license
- D X (combination of H and N for tank vehicles carrying hazardous materials)
- A A logbook
- B A medical card
- C Cargo securement straps
- D An expired permit or shipper certification missing
- A Pickups only
- B Vehicles older than 5 years
- C Any vehicle
- D Vehicles whose driver and equipment meet all federal safety requirements
- A Only the shipper's name
- B Only the price
- C A proper shipping name, hazard class, and identification number
- D Driver's license number
- A Try to put it out with water
- B Open the cargo doors to ventilate
- C Stay upwind, evacuate the area, and let trained responders handle it
- D Drive the vehicle to a safe place
- A Be left where it is, the area isolated, and the carrier and emergency services notified
- B Be unloaded by the driver alone
- C Be driven to the destination
- D Be moved to a remote area immediately
- A UN or NA followed by four digits
- B A state two-letter code
- C A serial number
- D A barcode only
Study tips for the Ohio Hazardous Materials exam
The Hazardous Materials portion of the Ohio CDL exam is graded out of the bank of questions the Ohio Bureau of Motor Vehicles draws from each year. While the exact bank is not published, every question is sourced from the Hazardous Materials chapter of the Ohio 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 Ohio 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 Ohio Bureau of Motor Vehicles 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 Ohio 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 Ohio 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 Ohio Bureau of Motor Vehicles office.
Already comfortable with this endorsement? Drill another: OH General Knowledge · OH Air Brakes · OH Combination Vehicles · OH Passenger · OH School Bus · OH Tank Vehicle · OH Doubles / Triples
New to the CDL process in Ohio? Read How to apply for a CDL in Ohio for the document checklist and step-by-step timeline.