Hazardous Materials — CDL Class A practice questions

A dock worker wants to load a corrosive next to a material the table says must be separated. What should the driver do FIRST?

1. Load it and separate the two at the next stop
2. Accept it if both are in sealed steel drums
3. Refuse the arrangement and re-plan the load
4. Place a divider board between the two units

Answer: C — Refuse the arrangement and re-plan the load

C) Right — the segregation and separation table is mandatory; incompatible materials must not be loaded together in the prohibited arrangement. A) Postponing correction still moves an illegal load. B) Sound packaging does not override a segregation prohibition. D) An improvised divider is not the compliance the table requires.

While reviewing the shipping paper, a driver notices the hazardous entry is buried among ordinary freight lines. What must be true of that entry?

1. It must be highlighted, tabbed or listed first
2. It must appear on a separate paper from other freight
3. It must be signed by the receiving consignee
4. It must show the retail value of the material

Answer: A — It must be highlighted, tabbed or listed first

A) Right — hazardous entries must stand out: listed first, highlighted in a contrasting color, or marked with an X in a designated column. B) A separate document is not required, only clear identification. C) The consignee signs at delivery, not for validity in transit. D) Value has no place on a shipping paper.

Hazmat placards are required when transporting:

1. Any amount of any hazardous material
2. 1,001 lbs or more aggregate gross weight of placardable hazmat (Table 2), OR any amount of Table 1 materials
3. Only liquids
4. Only quantities over 5,000 lbs

Answer: B — 1,001 lbs or more aggregate gross weight of placardable hazmat (Table 2), OR any amount of Table 1 materials

A) Most hazmat under 1,001 lbs doesn't need placards (Table 2). B) Correct — Table 1 materials (most dangerous) always need placards in any amount; Table 2 materials need placards at 1,001 lbs aggregate or more. C/D) Wrong thresholds.

Hazmat drivers must attend their vehicle:

1. At all times when carrying Division 1.1, 1.2, or 1.3 explosives
2. Only at fuel stops
3. Only during loading
4. Never required

Answer: A — At all times when carrying Division 1.1, 1.2, or 1.3 explosives

B) Incomplete. A) Correct — explosive divisions 1.1, 1.2, 1.3 require continuous attendance. C) Required at more than loading. D) False.

A driver leaves the cab of a placarded vehicle to eat. What should be done with the shipping papers?

1. Carry them along to keep them secure
2. Leave them on the driver's seat
3. Lock them in the glove box out of view
4. Put them under a windshield wiper

Answer: B — Leave them on the driver's seat

B) Right — when the driver is out of the vehicle the papers go on the driver's seat or in the door pouch so responders find them. A) Carrying them off leaves responders blind to the load. C) Locked storage defeats the purpose entirely. D) Outside the glass they blow away and are not a recognized location.

The Emergency Response Guidebook (ERG) is used to:

1. Quickly identify hazards and initial response actions for hazmat incidents
2. Plan delivery routes
3. Calculate fuel consumption
4. Train new drivers

Answer: A — Quickly identify hazards and initial response actions for hazmat incidents

B) Different document. A) Correct — ERG matches UN/NA numbers and placards to evacuation distances, fire response, and PPE info. C/D) Unrelated.

An applicant wants a hazardous materials endorsement. What does federal law require beyond the knowledge test?

1. A road test in a placarded tanker
2. Two years of verifiable interstate driving
3. A security threat assessment on file
4. A letter of sponsorship from a carrier

Answer: C — A security threat assessment on file

C) Right — the hazardous materials endorsement requires a security threat assessment including fingerprinting and a background check, plus periodic renewal. A) The endorsement is knowledge-based; no separate road test is federally required. B) No federal experience minimum applies. D) Sponsorship is not a federal condition.

Which listing correctly pairs a class number with its family of materials?

1. Class 7 with radioactive material
2. Class 4 with corrosive liquids and acids
3. Class 6 with oxidizing agents
4. Class 8 with poisonous inhalation gases

Answer: A — Class 7 with radioactive material

A) Right — Class 7 is radioactive material. B) Class 4 covers flammable solids and water-reactive materials, not corrosives. C) Class 6 is poisons and infectious substances, not oxidizers. D) Class 8 is corrosives; poisons belong to Class 6.

A driver hauling Division 1.1 explosives must stop overnight. What does the attendance rule require?

1. The vehicle may be left in any lighted lot
2. A qualified person must attend the vehicle
3. The load may be dropped at a public terminal
4. Local police must be notified of the parking

Answer: B — A qualified person must attend the vehicle

B) Right — a vehicle carrying Division 1.1, 1.2 or 1.3 explosives must be attended by a qualified person or parked in an approved location. A) Lighting alone does not satisfy attendance. C) Dropping the load at a public terminal abandons custody of high explosives. D) Notifying police is not the required substitute for attendance.

A driver picks up 1,100 pounds of a placardable hazardous material. What does the federal threshold require?

1. Placards, since the load is over 1,001 pounds
2. No placards, because 1,100 is under the limit
3. Placards only if the trip crosses a state line
4. Placards only when the load fills the trailer

Answer: A — Placards, since the load is over 1,001 pounds

A) Right — the general threshold is more than 1,001 pounds aggregate gross weight of placardable material. B) Reverses the threshold; 1,100 exceeds it. C) Placarding is not tied to interstate travel. D) Volume is irrelevant; weight and class drive the rule.

Who is responsible for identifying a hazardous material, and who is responsible for refusing an improper shipment?

The shipper identifies, classifies, packages, marks, labels, and prepares the shipping paper; the driver must refuse leaking packages or shipments that are improperly marked, labeled, or documented.

What is the segregation rule concept for hazardous materials loading?

Certain materials may not be loaded together because they react dangerously — for example, oxidizers must be kept away from flammable liquids and poisons must never be loaded with food products intended for consumption.

What nine hazard classes are used in the hazardous materials regulations?

1 Explosives • 2 Gases • 3 Flammable liquids • 4 Flammable solids • 5 Oxidizers and organic peroxides • 6 Poisons and infectious substances • 7 Radioactive • 8 Corrosives • 9 Miscellaneous hazardous materials.

Hazmat endorsement (H)?

Required to transport placardable hazmat. Requires TSA background check + knowledge test.