Question 1

Before loading or unloading hazardous materials, the first thing you must do is:

Accepted Answer

To prevent movement during loading/unloading, the parking brake must be set, and wheels must be chocked to ensure the vehicle does not roll.

Question 2

When loading Class 1 (Explosives), the engine must be:

Accepted Answer

The engine must be turned off before loading or unloading Class 1 explosives, unless the engine is needed to operate a pump or loading mechanism.

Question 3

You are loading Class 3 (Flammable Liquids). You must prohibited smoking within:

Accepted Answer

Smoking is prohibited within 25 feet of Class 3, Class 4, Class 5, or Division 2.1 materials during loading/unloading.

Question 4

Packages with 'Orientation Arrows' (This Way Up labels) must be loaded:

Accepted Answer

Packages with orientation arrows contain liquids and must be loaded with the arrows pointing up to prevent leakage.

Question 5

When loading or unloading flammable liquids, you must use a ground wire between the vehicle and the fill pipe to prevent:

Accepted Answer

Bonding and grounding prevent static electricity sparks, which could ignite flammable vapors during transfer.

Question 6

Tools used for loading or unloading Class 1 (Explosives) must be:

Accepted Answer

To prevent accidental ignition, tools used near explosives must be made of non-sparking material (like brass or wood) and protected from impact.

Question 7

Can you use hooks to handle packages containing Class 1 explosives?

Accepted Answer

Bales or packages of explosives must not be handled with hooks or other sharp metal tools that could damage the packaging.

Question 8

Before moving a cargo tank vehicle after loading, you must ensure:

Accepted Answer

Manhole covers, valves, and closures must be secured to prevent leaks or spills during transport.

Question 9

Class 8 (Corrosive) liquids should generally be loaded:

Accepted Answer

Corrosives should be loaded such that they cannot fall onto other freight. Loading them low prevents damage to other cargo if a leak occurs.

Question 10

When transporting Division 1.1, 1.2, or 1.3 explosives, you must possess:

Accepted Answer

Drivers transporting Division 1.1, 1.2, or 1.3 explosives must have a copy of the Federal Motor Carrier Safety Regulations (FMCSR) Part 397 (Transportation of Hazardous Materials; Driving and Parking Rules) in the vehicle.

Question 11

Nitric Acid (Class 8) must never be loaded:

Accepted Answer

Nitric Acid is an oxidizer as well as a corrosive. If it leaks onto other materials, it can cause a fire. It must never be stacked on top of other freight.

Question 12

If you are loading Class 4.2 (Spontaneously Combustible) materials, you must ensure:

Accepted Answer

Class 4.2 materials can ignite in contact with air. Packaging must be secure, and often kept dry if they react with moisture (though 4.3 is the 'wet' hazard, 4.2 handling generally requires careful containment).

Question 13

Compressed gas cylinders must be protected from:

Accepted Answer

Heat increases internal pressure, and physical damage can rupture the valve or cylinder. They must be secured upright or horizontally depending on type.

Question 14

Which material requires the vehicle floor to be swept clean of all organic residue (sawdust, hay, etc.) before loading?

Accepted Answer

Oxidizers (5.1) can ignite organic materials like sawdust or wood chips. The floor must be clean before loading.

Question 15

You are loading batteries (wet, filled with acid). You should:

Accepted Answer

Batteries must be loaded upright and secured to prevent short circuits and acid spills.

Question 16

When loading hazardous materials into a vehicle with a heater, the heater must:

Accepted Answer

Combustion heaters must be turned off/inoperative when transporting Explosives or Flammables unless they meet specific safety standards.

Question 17

During loading, the driver must verify that the packages:

Accepted Answer

The driver is the final check. They must ensure packages are intact, labeled correctly, and match the manifest.

Question 18

For Division 2.3 (Poison Gas) or Division 6.1 (Poison), you must NOT load these with:

Accepted Answer

Poisons must never be loaded with food or feed to prevent contamination.

Question 19

A tank vehicle used for Class 3 (Flammable Liquids) must be grounded:

Accepted Answer

Grounding/bonding must be established *before* any transfer begins to prevent static sparks at the moment of connection/opening.

Question 20

When loading Division 1.1 explosives, you must use:

Accepted Answer

Trailers carrying Class 1 explosives often require a non-ferrous (non-sparking) liner or floor to prevent friction sparks.

Question 21

If a package of hazmat is damaged during loading, you should:

Accepted Answer

Never transport damaged or leaking packages.

Question 22

You are transporting a load of Class 7 Radioactive materials. You must ensure:

Accepted Answer

The total Transport Index (TI) for all packages in a single vehicle usually must not exceed 50.

Question 23

When loading multiple hazmat shipments at different stops, you must:

Accepted Answer

Shipping papers must be kept current and accessible. As you add freight, add papers. As you drop off, remove them.

Question 24

If you are loading a cargo tank with a 'bottom loading' system, you must:

Accepted Answer

During bottom loading, air inside the tank must escape. If the vapor recovery system fails or vents are closed, the tank can rupture from pressure.

Question 25

Securement of hazardous materials cargo is:

Accepted Answer

Drivers must ensure cargo is secured against movement (braced, blocked, tied down) before transport.

Question 26

Which class of material requires the vehicle to be 'Stopped' and 'Engine Off' before loading?

Accepted Answer

Class 1 Explosives have the strictest loading rules regarding engine operation.

Question 27

What is 'Outage' (or ullage)?

Accepted Answer

Outage is the empty space left at the top of a tank to allow the liquid to expand as it gets warm without bursting the tank.

Question 28

If a vehicle is carrying Division 1.1 explosives, can you use a cargo heater?

Accepted Answer

Heaters are generally prohibited with explosives unless rendered inoperative or certified as explosion-proof.

Question 29

When carrying Division 2.3 (Poison Gas), you should avoid:

Accepted Answer

Drivers transporting hazmat, especially Poison Gas, must choose routes that minimize risk to populations unless no other route exists.

Question 30

You must check the condition of the dual tires on a placarded vehicle:

Accepted Answer

Tires on placarded vehicles must be checked at the start of the trip and every time the vehicle is parked to prevent fires.

Hazmat Loading/Unloading Practice Questions

Download VoltExam — $17.99 Lifetime

More CDL Hazmat Endorsement Exam Topics