CDL Hazmat Practice Test

Updated October 27, 2026

1. Packing groups show how dangerous a material is within its hazard class. Which packing group means the greatest danger?
   A.Packing group IB.Packing group IIC.Packing group IIID.Packing group IV
2. Placards are required for your load. Who puts them on the vehicle?
   A.The consignee, when the load is deliveredB.The driver, using placards the shipper providesC.A state inspector, at the first weigh stationD.Nobody, since placards are optional for most loads
3. In what order does a shipping paper give the basic description of a hazardous material?
   A.Hazard class, packing group, shipping name, ID numberB.Shipping name, ID number, packing group, hazard classC.ID number, proper shipping name, hazard class or division, packing groupD.Packing group, hazard class, ID number, shipping name
4. Where must the placards be on a vehicle that needs them?
   A.On the front and rear onlyB.On both sides onlyC.On the rear and the driver's side onlyD.On each side and each end
5. Your van carries 600 pounds of a Class 8 corrosive and 500 pounds of a Class 3 flammable liquid, all in non-bulk packages. Are placards required?
   A.Yes, because the Table 2 materials add up to 1,100 poundsB.No, because neither class reaches 1,001 pounds by itselfC.No, because corrosives and flammable liquids cancel outD.Yes, but only a single placard on the rear
6. You will haul Division 1.1 explosives. What kind of floor lining must the cargo space have?
   A.Stainless steel plateB.Non-metallic material or a non-ferrous metalC.Bare steel diamond plateD.No lining, since liners trap sparks
7. Why is a half-full liquid tank harder to stop smoothly than a full one?
   A.The tank's pressure relief valves openB.The tank's brakes are set for a full loadC.The liquid surges back and forth inside the tankD.The empty space makes the trailer lighter than the tractor
8. Your placarded truck approaches a railroad crossing with no signal or flagman. Where must you stop?
   A.Right at the edge of the nearest railB.5 to 10 feet before the nearest railC.75 to 100 feet before the nearest railD.15 to 50 feet before the nearest rail
9. When must you check the tires on a placarded vehicle?
   A.At the start of each trip and each time you parkB.Every 2 hours or every 100 miles, whichever comes firstC.Once a day, during the pre-trip inspection onlyD.Only when a tire looks low
10. What rating must the fire extinguisher on a placarded power unit have?
    A.2 A or moreB.10 B:C or moreC.5 B:C or moreD.Any rating, as long as it is charged
11. Your hazmat load is involved in a crash. Where should you keep bystanders?
    A.Close enough to help you move the cargoB.Downwind, so the wind carries their voices to youC.Far away and upwind of the vehicleD.Inside nearby vehicles with the windows open
12. A hazmat incident must be reported to the National Response Center by phone. How soon?
    A.Within 30 daysB.Within 7 daysC.By the end of the next business dayD.As soon as practical, and no later than 12 hours after the incident
13. Which of these is the shipper's job?
    A.Packaging, marking and labeling the material and preparing the shipping papersB.Driving the load to its destination without delayC.Choosing the highway route for the tripD.Checking the driver's hazmat endorsement at the dock
14. You step out of the cab at a delivery. Where do the hazmat shipping papers go?
    A.In your pocket, so they stay with youB.On the driver's seat or in the pouch on the driver's doorC.In the glove box, out of sightD.In the cargo area, next to the hazmat
15. You are hauling Class 5 oxidizers on a flatbed. Which rule applies to how they are loaded?
    A.They may hang over the tailgate if strapped downB.They may ride on the cab roof if coveredC.They must be entirely within the vehicle body, with no overhang or tailgate loadD.They may be hauled only between sunset and sunrise