Q: Gasoline is classified as:

Gasoline is a liquid with a low flash point, making it a Class 3 Flammable Liquid.

Q: Which Hazard Class contains 'Flammable Solids'?

Class 4 covers Flammable Solids (4.1), Spontaneously Combustible (4.2), and Dangerous When Wet (4.3).

Q: Materials that catch fire spontaneously upon contact with air are in which Division?

Division 4.2 consists of Spontaneously Combustible materials (pyrophoric) that ignite without an external ignition source within 5 minutes of contact with air.

Q: Division 4.3 materials are dangerous when:

Division 4.3 is 'Dangerous When Wet'. These materials emit flammable or toxic gases upon contact with water.

Q: What is the primary hazard of Class 5 materials?

Class 5 (Oxidizers and Organic Peroxides) releases oxygen, which intensifies fires and can cause other materials to burn without air.

Question 1

Hazard Class 1 materials are defined as:

Accepted Answer

Class 1 consists of Explosives, divided into six divisions (1.1 through 1.6) based on their hazard level.

Question 2

Which Division of Class 1 explosives presents a 'Mass Explosion' hazard?

Accepted Answer

Division 1.1 explosives (like dynamite) have a mass explosion hazard, meaning the entire load could explode virtually instantaneously.

Question 3

Hazard Class 2 is comprised of:

Accepted Answer

Class 2 covers Gases, including flammable (2.1), non-flammable/non-poisonous (2.2), and poison gases (2.3).

Question 4

Propane is an example of which Hazard Class and Division?

Accepted Answer

Propane is a Flammable Gas, which falls under Class 2, Division 2.1.

Question 5

What defines a Class 3 material?

Accepted Answer

Class 3 includes Flammable Liquids (flash point <140°F) and Combustible Liquids (flash point >140°F but <200°F).

Question 6

Gasoline is classified as:

Accepted Answer

Gasoline is a liquid with a low flash point, making it a Class 3 Flammable Liquid.

Question 7

Which Hazard Class contains 'Flammable Solids'?

Accepted Answer

Class 4 covers Flammable Solids (4.1), Spontaneously Combustible (4.2), and Dangerous When Wet (4.3).

Question 8

Materials that catch fire spontaneously upon contact with air are in which Division?

Accepted Answer

Division 4.2 consists of Spontaneously Combustible materials (pyrophoric) that ignite without an external ignition source within 5 minutes of contact with air.

Question 9

Division 4.3 materials are dangerous when:

Accepted Answer

Division 4.3 is 'Dangerous When Wet'. These materials emit flammable or toxic gases upon contact with water.

Question 10

What is the primary hazard of Class 5 materials?

Accepted Answer

Class 5 (Oxidizers and Organic Peroxides) releases oxygen, which intensifies fires and can cause other materials to burn without air.

Question 11

Division 5.2 materials are known as:

Accepted Answer

Division 5.2 contains Organic Peroxides, which are thermally unstable and may burn rapidly or explode.

Question 12

Class 6 materials are divided into Poison/Toxic (6.1) and:

Accepted Answer

Class 6 is divided into 6.1 (Poison/Toxic materials) and 6.2 (Infectious Substances/Biohazards).

Question 13

Potassium Cyanide is an example of:

Accepted Answer

Potassium Cyanide is a toxic solid, falling under Division 6.1 Poison (Toxic) materials. (Division 2.3 is for gases).

Question 14

Hazard Class 7 includes:

Accepted Answer

Class 7 consists of Radioactive materials (e.g., Uranium, medical isotopes).

Question 15

What is the primary hazard of Class 8 materials?

Accepted Answer

Class 8 Corrosives cause visible destruction or irreversible alterations to human skin or corrode metal (like aluminum/steel).

Question 16

Battery fluid (acid) is an example of:

Accepted Answer

Battery acid is corrosive to skin and metal, placing it in Class 8.

Question 17

Class 9 materials are:

Accepted Answer

Class 9 covers Miscellaneous hazardous materials that present a hazard during transport but do not meet the definition of any other class (e.g., dry ice, lithium batteries, asbestos).

Question 18

Which Division includes 'Consumer Commodities' (ORM-D)?

Accepted Answer

ORM-D (Other Regulated Material) is a reclassification for materials packaged for retail sale that pose limited hazard. (Note: ORM-D is being phased out for Limited Quantity, but still appears on some legacy exams).

Question 19

Division 2.3 covers:

Accepted Answer

Division 2.3 is Poison Gas (e.g., Chlorine, Phosgene), known to be toxic to humans.

Question 20

Which of the following is considered a 'Combustible Liquid'?

Accepted Answer

Combustible liquids have higher flash points (typically >140°F or >100°F in older regs, but <200°F) than Flammable Liquids. Diesel fuel is a common combustible liquid.

Question 21

Which division of explosives contains items with a 'minor explosion' hazard (e.g., consumer fireworks)?

Accepted Answer

Division 1.4 consists of explosives that present a minor explosion hazard (e.g., small arms ammunition, consumer fireworks).

Question 22

A material that yields oxygen and causes combustion is a(n):

Accepted Answer

This is the definition of an Oxidizer (Division 5.1).

Question 23

Helium is classified as:

Accepted Answer

Helium is an inert, non-flammable, non-poisonous compressed gas (Division 2.2).

Question 24

Division 6.2 'Infectious Substances' includes:

Accepted Answer

Division 6.2 includes materials known or reasonably expected to contain pathogens (bacteria, viruses, etc.).

Question 25

What is the difference between Division 1.1 and 1.2 explosives?

Accepted Answer

Division 1.1 has a mass explosion hazard (blast). Division 1.2 has a projection hazard (shrapnel/debris) but not a mass explosion hazard.

Question 26

Which class includes lithium batteries?

Accepted Answer

Lithium batteries are classified as Class 9 Miscellaneous Hazardous Materials.

Question 27

What defines a 'Flammable Liquid' (Class 3)?

Accepted Answer

The DOT defines a Flammable Liquid as one having a flash point of not more than 60°C (140°F).

Question 28

Division 1.3 explosives have a primary hazard of:

Accepted Answer

Division 1.3 explosives (like display fireworks) have a fire hazard and either a minor blast or minor projection hazard, but not a mass explosion hazard.

Question 29

Ammonium Nitrate is a common example of:

Accepted Answer

Ammonium Nitrate is a powerful oxidizer (Division 5.1) used in fertilizers and explosives.

Question 30

Division 1.5 explosives are:

Accepted Answer

Division 1.5 consists of Very Insensitive explosives (like blasting agents) that have a mass explosion hazard but are so insensitive that there is little probability of initiation during transport.

Question 31

Class 8 materials (Corrosives) can be:

Accepted Answer

Corrosives can be either liquids (like battery acid) or solids (like sodium hydroxide pellets).

Question 32

Dry Ice (Carbon Dioxide, solid) is classified as:

Accepted Answer

Dry Ice is Class 9 (Miscellaneous) because it produces carbon dioxide gas which can displace oxygen in confined spaces.

Question 33

Which class is typically associated with the 'Spontaneously Combustible' placard?

Accepted Answer

Division 4.2 is Spontaneously Combustible.

Question 34

An 'Inhalation Hazard' is most likely associated with:

Accepted Answer

Materials that are toxic by inhalation fall under Division 2.3 (gases) or Division 6.1 (liquids meeting inhalation toxicity criteria).

Question 35

Division 1.6 explosives are:

Accepted Answer

Division 1.6 contains Extremely Insensitive Detonating Substances (EIDS) which demonstrate a negligible probability of accidental initiation or propagation.

Hazmat Classes Practice Questions

More CDL Hazmat Endorsement Exam Topics