Free Mississippi CDL Hazmat Endorsement Test Practice Test

Sample CDL Hazmat Endorsement practice questions

Try a few representative questions below. Each includes the correct answer and a short explanation — the same style you'll see in the full practice test.

1. Question 1Incident Response

   A commercial motor vehicle (CMV) placarded for Division 4.1 (Flammable Solids) is involved in an incident. While initial responders await the arrival of specialized hazmat teams, what is the primary immediate action for the driver concerning the vehicle's configuration and potential hazards?

   • A.Position the vehicle so that any potential vapor cloud disperses away from the roadway and other vehicles.
   • B.Disengage the engine and activate the vehicle's emergency hazard lights, then evacuate the immediate vicinity.(Correct)
   • C.Secure the vehicle and move it to a safe location away from populated areas if safe to do so, ensuring all engine ignition sources are off.
   • D.Immediately attempt to extinguish any visible flames using a Class B fire extinguisher.

   Explanation

   The primary immediate action is to secure the vehicle and turn off the engine to eliminate ignition sources. Evacuation to a safe distance is crucial for flammable solids. Moving the vehicle should only be attempted if it can be done safely without further risk. Extinguishing flames should be left to trained personnel with appropriate equipment.

2. Question 2Placarding and Marking

   You are transporting a shipment of UN2810, Toxic liquid, organic, n.o.s., with a gross weight of 30,000 lbs. The shipping paper indicates a 49 CFR § 172.101 Appendix A subsidiary hazard. According to the Hazardous Materials Regulations (HMR), what is the minimum placarding required on the motor vehicle carrying this shipment, assuming no other hazardous materials are present?

   • A.Toxic (3.2) and Flammable (3.3)
   • B.Poison (1.1)(Correct)
   • C.Poison (1.1), Toxic (3.2), and Flammable (3.3)
   • D.Toxic (3.2)

   Explanation

   UN2810, Toxic liquid, organic, n.o.s., falls under hazard class 6.1 (Poisonous Material). The HMR requires placarding based on the gross weight of the hazardous material. For Class 6.1 materials shipped in quantities of 1,001 lbs or more, the 'POISON' placard (symbolized as 1.1 in some diagrams) is required. The subsidiary hazard indicated in Appendix A refers to additional risks, but the primary hazard class dictates the main placard unless specific quantity thresholds for subsidiary placards are met.

3. Question 3Placarding and Marking

   A driver is hauling a load of UN1950, Aerosols, containing flammable gas. The total quantity of UN1950 is 5,000 lbs. The shipping paper also lists UN1203, Gasoline, 10 gallons. What is the correct placarding for this vehicle, assuming it's a single-unit vehicle?

   • A.Flammable Gas (2.1) and Flammable Liquid (3.1)(Correct)
   • B.Flammable Liquid (3.1) only
   • C.Flammable Gas (2.1) only
   • D.No placarding is required as the gasoline quantity is below the threshold.

   Explanation

   UN1950, Aerosols, containing flammable gas, falls under hazard class 2.1 (Flammable Gas). The threshold for placarding Class 2.1 materials is 1,001 lbs. Since 5,000 lbs is over this threshold, the 'FLAMMABLE GAS' placard is required. UN1203, Gasoline, is Class 3 (Flammable Liquid). The threshold for placarding Class 3 is 1,001 lbs. Since 10 gallons is far below this threshold, no Class 3 placard is needed. Therefore, only the 'FLAMMABLE GAS' placard is required.

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