Delaware Hazmat CDL Practice Test

This is a free 20-question practice test for the Hazmat portion of the Delaware Commercial Driver's License knowledge exam. Questions are pulled from a pool of 68 drawn from the AAMVA CDL Manual, which is the source document the Delaware Division of Motor Vehicles uses to write its actual exam.

How it works: Click an answer. The correct choice highlights in green, and you'll see a short explanation. Aim for 85% or better before you sit for the real test in Delaware.

Question 1 of 20

Class 1.1, 1.2, or 1.3 explosives must be parked:

Anywhere
In an attended location with a qualified person within 100 feet, awake and able to see the vehicle
At a school
At a gas station

Correct. Division 1.1, 1.2, and 1.3 explosives, and Division 2.3 or 6.1 PIH cargo, must have an attended-vehicle (qualified person within 100 feet, awake, able to see the vehicle).

Question 2 of 20

When in the cab with the engine running, the hazmat shipping paper must be:

In the trailer
Within the driver's reach — clipped on the driver's door clip or on the driver's seat
In the glove compartment
In the trunk

Correct. When in the seat with the engine running, keep shipping papers within reach (driver-side door clip or on the seat). When out of the vehicle, leave on the seat or in the door pouch.

Question 3 of 20

When you transport Division 1.1 or 1.2 explosives, you must have a written route plan:

No, never
Yes — required for these explosives
Only on weekends
Only across state lines

Correct. A written route plan is required for transporting Division 1.1 or 1.2 explosives. The driver must follow it unless there is an emergency.

Question 4 of 20

When loading or unloading cargo tanks of flammable liquid, the driver must:

Stay alert and within 25 feet of the vehicle, with a clear view
Leave the area
Smoke
Run the engine at high RPM

Correct. During cargo-tank flammable-liquid loading or unloading, the driver must remain attentive and within 25 feet of the vehicle with an unobstructed view.

Question 5 of 20

When you stop a hazmat-placarded vehicle at the side of the road, you must place reflective triangles:

Within 10 minutes of stopping
Immediately, but never use flares with Division 1.1, 1.2, 1.3 explosives, oxidizers, or flammable cargo
Only if dark
Only if other vehicles are present

Correct. Place warning devices within 10 minutes. Never use flares with explosives, flammable cargo, or oxidizers — use reflective triangles or red lanterns.

Question 6 of 20

Hazard Class 8 is:

Flammable solids
Corrosives
Radioactive
Gases

Correct. Class 8 is corrosive materials — sulfuric acid, sodium hydroxide, hydrochloric acid, etc.

Question 7 of 20

Placards must be at least how many inches on each side?

10.75 inches (273 mm)
5 inches
15 inches
20 inches

Correct. Placards are diamond-shaped, at least 250 mm (about 10.75 inches) on each side.

Question 8 of 20

A driver's responsibilities for hazmat include:

Refusing to accept improperly marked, labeled, or leaking shipments; placarding the vehicle; following routes; carrying the shipping paper; responding to incidents
Only signing the bill of lading
Only delivering on time
Only refueling

Correct. The driver verifies the shipment, placards if required, carries the documentation, follows routes and parking rules, and handles incidents per training.

Question 9 of 20

A vehicle that has been transporting hazmat may need to be:

Decontaminated and re-placarded as required after unloading
Painted
Sold
Inspected by USCG

Correct. After unloading, the vehicle may need decontamination depending on the cargo. Placards may need to be removed unless residue still requires them.

Question 10 of 20

A driver is required to carry an ERG (or equivalent) when:

Driving any commercial vehicle
Transporting any quantity of hazardous materials
Only when hauling explosives
Only on weekends

Correct. Whenever hazmat is being transported, the driver must have access to current ERG information for the materials in question.

Question 11 of 20

When transporting hazmat, you must check the cargo every:

Mile
100 miles
150 miles or 3 hours, plus changes of duty status
500 miles

Correct. Federal cargo securement: check at the start, then every 150 miles or 3 hours of driving, plus every change of duty status.

Question 12 of 20

Drivers of hazmat vehicles must avoid which of the following routes when alternatives exist?

Tunnels, narrow streets, and densely populated areas
Interstates
Highways
Rural routes

Correct. Avoid populated areas, narrow streets, tunnels, and other places where an incident would maximize risk. Follow state-designated hazmat routes.

Question 13 of 20

Subsidiary risk labels on a package indicate:

Additional hazards beyond the primary hazard
Just decoration
The price
The weight

Correct. Some materials have multiple hazards. The primary hazard is shown on the top-class label; subsidiary risks (e.g., toxic AND flammable) are shown on additional labels.

Question 14 of 20

A driver of a hazmat-loaded vehicle must check the tires:

Once before the trip
At the start of the trip and every time the vehicle is parked
Only at fueling
Never

Correct. Hazmat drivers must check tires at the beginning and again each time the vehicle is parked. A flat or smoking tire must be addressed before continuing.

Question 15 of 20

A hazmat driver must complete which special training?

General awareness, function-specific, safety, security awareness, and in-depth security if a security plan is required
Forklift training
Basic first aid only
Defensive driving only

Correct. PHMSA requires general awareness, function-specific, safety, security awareness, and in-depth security training (when a security plan applies). Carriers document and re-train every three years.

Question 16 of 20

The Hazmat (H) endorsement requires:

Only a knowledge test
A knowledge test plus a TSA Threat Assessment background check
Just a fee
A skills test only

Correct. Hazmat applicants pass a knowledge test and complete the TSA Threat Assessment (HME), which involves fingerprints and an FBI background check.

Question 17 of 20

Mixing certain hazmat in one shipment is prohibited because:

Of cost
They may react dangerously together; the segregation table specifies prohibitions
It is too heavy
Of regulations on cargo color

Correct. Some classes react dangerously when mixed (e.g., acids with cyanides, oxidizers with flammables). The segregation table prohibits these mixtures.

Question 18 of 20

Electrical equipment in cargo areas of vehicles transporting Class 3 (flammable) liquids must be:

Disconnected
Spark-free or explosion-proof to prevent ignition
Painted red
Made of plastic

Correct. Wiring and electrical fittings in flammable-liquid loading areas must be designed to prevent ignition — spark-free, sealed, or explosion-proof.

Question 19 of 20

Hazmat drivers must report any change of:

Address to the licensing agency
Daily route
Diet
Vehicle paint color

Correct. Address changes must be reported to the state licensing agency in line with state CDL requirements; some states require reporting within 30 days.

Question 20 of 20

A "DANGEROUS" placard may be used:

Instead of multiple Table 2 placards when 1,001+ lbs of two or more Table 2 materials are loaded
For any cargo
For non-hazmat
For hazmat below 100 lbs

Correct. When more than two Table 2 materials are aboard with combined weight over 1,001 lbs (none over 2,205 lbs at one stop), a single DANGEROUS placard may substitute.

About the Delaware Hazmat exam

Most states administer 30 Hazmat questions and require 80% to pass. The exam covers hazard classes, the shipping paper, placards and labels, loading and unloading, driving and parking rules, emergency response, and the Emergency Response Guidebook (ERG).

The Delaware Division of Motor Vehicles follows the federal CDL standards established by FMCSA. To earn the Hazmat credential, you must answer at least 80% of the questions correctly. Many candidates score lower the first time because the test pulls from a large pool — refreshing this page will give you a different mix of questions, drawn from the same authoritative source.

Want more practice? Try the full Hazmat question bank or browse all Delaware CDL practice tests.