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Ohio CDL Hazmat study materials
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Ohio CDL Hazmat practice questions

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Question 1Hazardous materials regulations and definitions

Gasoline is transported as a hazardous material. Which hazard class applies to gasoline?

  1. Class 9 (miscellaneous)
  2. Class 2.1 (flammable gas)
  3. Class 3 (flammable liquid) Correct answer.
  4. Class 8 (corrosive)

Explanation

Gasoline has a flash point well below 60 degrees Celsius (140 degrees Fahrenheit) and is therefore regulated as a Class 3 flammable liquid. Class 2 covers gases, Class 8 covers corrosives, and Class 9 covers miscellaneous hazardous materials.

Question 2Hazardous materials regulations and definitions

Which information must appear in the basic description on a shipping paper for a hazardous material?

  1. Total package weight, consignee signature, and delivery appointment time
  2. Proper shipping name, hazard class, UN/NA ID number, and packing group Correct answer.
  3. Driver's license number, vehicle plate number, and carrier's tax ID
  4. Emergency response guidebook page number, placard color, and route map

Explanation

The basic description on a hazmat shipping paper must include the proper shipping name, hazard class or division, UN/NA identification number, and packing group when one is assigned. Other entries may appear on the paperwork, but they do not replace this required sequence.

Question 3Hazardous materials regulations and definitions

When is a placard required on a motor vehicle carrying hazardous materials?

  1. Only when the material is loaded by the shipper rather than the carrier
  2. Only when the vehicle crosses a state boundary
  3. Only when the vehicle is parked at a facility that handles hazardous waste
  4. Whenever the vehicle is on a public highway carrying a quantity that requires placarding Correct answer.

Explanation

Placards are required when a vehicle operates on a public highway carrying a hazardous material in a quantity that requires placarding under Part 172. Crossing state lines, loading by the shipper, or parking location does not create or remove the placarding requirement.

Question 4Hazardous materials regulations and definitions

A material assigned to Division 6.1 is one that...

  1. Readily supports combustion and increases the burning rate of other materials during a fire
  2. Is a poisonous material, other than a gas, that can cause death or serious injury Correct answer.
  3. Has a flash point below 60 degrees Celsius and gives off flammable vapors at normal temperatures
  4. Causes full-thickness destruction of intact skin at the test site or severely corrodes steel

Explanation

Division 6.1 covers poisonous materials other than gases that are known to be toxic to humans and can cause death or serious injury through inhalation, ingestion, or skin contact. Flammable liquids are Class 3, oxidizers are Class 5, and corrosives are Class 8.

Question 5Hazardous materials regulations and definitions

On a hazardous materials shipping paper, what does the abbreviation RQ placed before the basic description indicate?

  1. The material is radioactive and requires a Route Control quantity
  2. The material is exempt from placarding because it is a residue
  3. A reportable quantity of a hazardous substance under CERCLA Correct answer.
  4. The material must be shipped only in a closed cargo tank

Explanation

RQ stands for reportable quantity, a threshold established for hazardous substances under CERCLA and used in the Hazardous Materials Regulations. Its presence tells the driver and emergency responders that the package contains a hazardous substance at or above that quantity.

Question 6Hazardous materials regulations and definitions

Which statement about the emergency response telephone number on a hazardous materials shipping paper is correct?

  1. It must be the driver's personal cell phone number
  2. It must be monitored at all times during transportation and incidental storage Correct answer.
  3. It is required only for materials in Packing Group I
  4. It may be a number that is answered only during the shipper's normal business hours

Explanation

The emergency response telephone number must be monitored at all times while the hazardous material is in transportation, including storage incidental to transportation. A number answered only during business hours or a driver's personal number does not satisfy the requirement.

Question 7Hazardous materials regulations and definitions

Materials that are spontaneously combustible or dangerous when wet belong to which hazard class?

  1. Class 3
  2. Class 4 Correct answer.
  3. Class 8
  4. Class 5

Explanation

Class 4 covers flammable solids (4.1), spontaneously combustible materials (4.2), and materials that are dangerous when wet (4.3). Class 3 is flammable liquids, Class 5 is oxidizers and organic peroxides, and Class 8 is corrosives.

Question 8Hazardous materials regulations and definitions

A material is classed as Class 8 (corrosive) when it...

  1. Is a gas that is toxic by inhalation at low concentrations
  2. Reacts violently with water to release a flammable gas
  3. Causes full-thickness skin destruction or steel corrosion at a specified rate Correct answer.
  4. Ignites readily at temperatures below 100 degrees Fahrenheit

Explanation

Class 8 corrosive materials cause full-thickness destruction of intact skin in testing or corrode steel or aluminum at a specified rate. A low flash point indicates a Class 3 material, and water reactivity indicates a Class 4 material.

Question 9Hazardous materials regulations and definitions

A toxic inhalation hazard material is assigned Hazard Zone A on a shipping paper. What does this designation mean?

  1. The material is a flammable gas that is not toxic by inhalation
  2. The material is the least hazardous toxic inhalation hazard and may be shipped without special routing
  3. The material is exempt from the emergency response telephone requirement
  4. The material presents the greatest hazard to the public if released during transportation Correct answer.

Explanation

For toxic inhalation hazards, Hazard Zone A is the highest hazard zone and represents the greatest danger to the public if the material is released. Zones B, C, and D represent progressively lower hazard levels.

Question 10Hazardous materials regulations and definitions

Under the Hazardous Materials Regulations, a material is a hazardous substance when it is...

  1. Listed in Appendix A and present at or above its reportable quantity Correct answer.
  2. Any material that is transported in a bulk packaging
  3. Any material that has a flash point below 140 degrees Fahrenheit and is shipped in bulk
  4. Any material that requires a Class 9 placard

Explanation

A hazardous substance under the HMR is a material listed in Appendix A to the Hazardous Materials Table that is present in one package at or above its reportable quantity, with special concentration rules for mixtures. A low flash point or bulk packaging alone does not establish hazardous substance status.

Question 11Hazardous materials regulations and definitions

A liquid offered for transportation has a flash point of 45 °C (113 °F). Under the Hazardous Materials Regulations, how is this material classed?

  1. Class 4 (flammable solid)
  2. Class 9 (miscellaneous hazardous material)
  3. Class 3 (flammable liquid) Correct answer.
  4. Class 8 (corrosive)

Explanation

Under 49 CFR 173.120, a flammable liquid is a liquid with a flash point of not more than 60 °C (140 °F), so a liquid flashing at 45 °C is a Class 3 material. Combustible liquids occupy a higher flash-point band and are handled under those provisions, not as Class 9. The hazard class assigned at the time of shipment drives the authorized packaging, labels, and placards.

Question 12Hazardous materials regulations and definitions

Under the HMR, a material is placed in Class 9 when it:

  1. Is capable of causing death or serious illness when inhaled by people or animals
  2. Presents a transportation hazard but fits no other hazard class Correct answer.
  3. Detonates as a mass explosion when subjected to heat or shock
  4. Is a liquid whose vapors can be ignited by a spark at ordinary ambient temperatures

Explanation

Class 9 is the residual category in 49 CFR 173.140: it covers materials that pose a hazard during transportation but do not meet any of the definitions for Classes 1 through 8. Lithium batteries and dry ice are common examples. The other option descriptions match Classes 3, 6.1, and 1.1 respectively.

Question 13Hazardous materials regulations and definitions

A package marking reads "UN 1993". Under the HMR, what does the four-digit number identify?

  1. The reportable quantity threshold that applies to the material under CERCLA
  2. The flash point of the material rounded to the nearest whole degree Celsius
  3. The registration number that PHMSA issues to the offeror of the material
  4. The identification number assigned to that hazardous material Correct answer.

Explanation

The letters UN followed by four digits identify the material by its United Nations identification number, which is listed with the proper shipping name in the hazardous materials table (49 CFR 172.101). The same number must appear on the shipping paper and, when required, on the package marking. It is not a quantity threshold, a physical property value, or a company registration number.

Question 14Hazardous materials regulations and definitions

At a minimum, how often must a hazmat employer repeat the required training for each hazmat employee?

  1. Every two years
  2. Every five years
  3. Every three years Correct answer.
  4. Every year

Explanation

49 CFR 172.704(c)(2) requires recurrent training at least once every three years after the employee's initial training. New hazmat employees may perform regulated functions only during the first 90 days after hire if they are under direct supervision of a trained employee. The employer must keep a training record, including the most recent training date.

Question 15Hazardous materials regulations and definitions

Which person is required to register with PHMSA before offering hazardous materials for transportation?

  1. A person who offers or transports a hazardous material for which placarding is required Correct answer.
  2. A packaging manufacturer, but only when it supplies specification packagings for liquids
  3. A shipper, but only when the shipment consists of hazardous waste moving to a treatment facility
  4. A motor carrier, but only if it operates a fleet of more than ten commercial motor vehicles

Explanation

Under 49 CFR 107.601, registration applies to persons who offer or transport hazardous materials that require placarding under Subpart F of Part 172, and to certain high-quantity or high-hazard shipments such as hazardous waste and highway route controlled quantities of Class 7 material. Fleet size, the packaging supplier, and whether the load is waste are not the general tests. The registration certificate or number must be made available during transportation.

Question 16Hazardous materials regulations and definitions

Hazardous waste shipped from a generator to a permitted treatment, storage, and disposal facility must be accompanied by which document?

  1. A hazardous waste manifest bearing the generator's certification Correct answer.
  2. A dangerous goods declaration prepared by the driver
  3. A placard inventory completed at the loading dock
  4. A bill of lading issued by the motor carrier

Explanation

Hazardous waste moving off site for treatment, storage, or disposal must be accompanied by the Uniform Hazardous Waste Manifest, on which the generator certifies that the waste is properly classified, packaged, marked, and labeled. The manifest travels with the shipment and is signed at each handoff. A bill of lading may accompany general freight but does not satisfy the waste-tracking requirement.

Question 17Hazardous materials regulations and definitions

Under 49 CFR 171.8, the term "hazmat employee" includes a person who:

  1. Directly affects hazmat transportation safety, for example by loading a package Correct answer.
  2. Works for a company that manufactures the hazardous material
  3. Owns or leases the commercial motor vehicle that carries the material
  4. Holds a commercial driver's license endorsed for hazardous materials

Explanation

A hazmat employee is defined by function, not by job title or license status: the person must directly affect hazardous materials transportation safety, such as by loading, unloading, inspecting, marking, labeling, or preparing shipping papers. Holding a hazmat endorsement, owning the truck, or simply working for a producer does not by itself create hazmat employee status. Employers must train and test anyone who meets the functional definition.

Question 18Hazardous materials regulations and definitions

Which set of actions falls within the HMR definition of "pre-transportation functions"?

  1. Responding to a spill at the scene and filing the incident report after a release occurs
  2. Inspecting and repairing the cargo tank, and requalifying it between trips
  3. Assigning the hazard class, selecting authorized packaging, and marking the package Correct answer.
  4. Driving the vehicle, parking it overnight, and fueling it at a truck stop along the route

Explanation

Section 171.8 defines pre-transportation functions as the duties needed to assure safe transportation before the material moves, including determining the hazard class, selecting the packaging, filling and closing it, marking and labeling, and preparing shipping papers. These duties trigger hazmat employee training obligations. Driving, spill response, and cargo tank requalification are separate activities governed by other rules.

Question 19Hazardous materials regulations and definitions

Which of the following is a bulk packaging under the HMR?

  1. A 5-gallon plastic jerrican used for a liquid
  2. A portable tank with a capacity of 600 gallons used for a liquid Correct answer.
  3. A 55-gallon steel drum used for a liquid
  4. A fiberboard box holding four 1-gallon cans of liquid

Explanation

Under 49 CFR 171.8, a bulk packaging has a maximum capacity greater than 450 L (119 gallons) for a liquid, greater than 400 kg (882 pounds) for a solid, or a water capacity greater than 454 kg (1,000 pounds) for a gas. A 600-gallon portable tank exceeds the liquid threshold, so it is bulk. Drums, jerricans, and boxes at the sizes listed are non-bulk packagings.

Question 20Hazardous materials regulations and definitions

A Class 1 material assigned to Division 1.4 is one that:

  1. Has a mass explosion hazard that would affect almost the entire quantity in the vehicle
  2. Is so insensitive that there is a negligible probability of accidental initiation in transport
  3. Presents a minor explosion hazard, with effects largely confined to the package Correct answer.
  4. Has a projection hazard but does not have a mass explosion hazard

Explanation

Division 1.4 covers explosives that present only a minor explosion hazard, with effects largely confined to the package and no projection of fragments of appreciable size or range. A mass explosion hazard belongs to Division 1.1, a projection hazard to Division 1.2, and extreme insensitivity to Division 1.6. Correct division assignment controls which placard and packaging may be used.

Question 21Hazardous materials regulations and definitions

Under the Hazardous Materials Regulations, a hazardous material is a substance or material that:

  1. poses an unreasonable risk to health, safety, or property when transported and is designated by DOT Correct answer.
  2. has a flash point below 200 °F, regardless of quantity, packaging, or DOT designation
  3. is transported in a bulk packaging at any temperature, whether or not the material appears in the Hazardous Materials Table
  4. appears on any OSHA workplace chemical list, regardless of whether the material is offered for transportation in commerce

Explanation

Under 49 CFR 171.8, a hazardous material is a substance or material that the Secretary of DOT determines is capable of posing an unreasonable risk to health, safety, and property when transported in commerce and that is designated as hazardous under the HMR. A chemical's presence on an OSHA list, a low flash point, or bulk packaging alone does not automatically make it a hazmat for transportation; the HMT and DOT designation control.

Question 22Hazardous materials regulations and definitions

A cylinder containing propane, a flammable gas, must display which hazard class label?

  1. Class 5.1 (oxidizer)
  2. Class 3 (flammable liquid)
  3. Class 2.1 (flammable gas) Correct answer.
  4. Class 2.2 (nonflammable gas)

Explanation

Propane is a flammable gas and is assigned to Division 2.1. Class 2.2 covers nonflammable, non-toxic gases, Class 3 covers flammable liquids, and Class 5.1 covers oxidizers. The hazard class label on the cylinder must match the material's assigned division.

Question 23Hazardous materials regulations and definitions

In the HMR packing group system, a hazardous material assigned to Packing Group I is one that presents:

  1. no regulated danger
  2. minor danger
  3. moderate danger
  4. great danger Correct answer.

Explanation

The HMR packing group system ranks the degree of danger within a hazard class. Packing Group I represents great danger, Packing Group II represents moderate danger, and Packing Group III represents minor danger. Every packing group reflects a regulated level of danger.

Question 24Hazardous materials regulations and definitions

A non-bulk package containing a hazardous material generally must be marked with which of the following before it is offered for transportation?

  1. the consignee's emergency response telephone number
  2. the shipper's DOT registration number
  3. the page number of the Emergency Response Guidebook
  4. the proper shipping name and UN identification number Correct answer.

Explanation

Under 49 CFR 172.301, a non-bulk package must generally be marked with the proper shipping name and the UN or NA identification number, along with any other markings that apply. The emergency response telephone number belongs on the shipping paper, and the ERG page number is reference information rather than a package marking.

Question 25Hazardous materials regulations and definitions

A liquid offered for transportation has a flash point of 80 °C (176 °F). Under the HMR, this liquid is classified as a:

  1. flammable liquid
  2. combustible liquid Correct answer.
  3. nonflammable gas
  4. flammable solid

Explanation

The HMR defines a flammable liquid as one with a flash point at or below 60 °C (140 °F). A combustible liquid has a flash point above 60 °C (140 °F) and below 93 °C (200 °F), so 80 °C falls in the combustible liquid range.

Question 26Hazardous materials regulations and definitions

A material assigned to Class 5.1 is one that:

  1. is toxic by inhalation and poses a hazard to human health during transportation
  2. is corrosive to skin and steel
  3. yields oxygen and may cause or enhance combustion Correct answer.
  4. is spontaneously combustible when exposed to air during transportation

Explanation

Class 5.1 covers oxidizers, which are materials that may, generally by yielding oxygen, cause or enhance the combustion of other materials. Spontaneously combustible materials are Class 4.2, toxic inhalation hazards are addressed in Division 6.1, and corrosives are Class 8.

Question 27Hazardous materials regulations and definitions

In addition to general awareness/familiarization and function-specific training, which topic must a hazmat employee receive under the HMR?

  1. commercial driver's license renewal procedures
  2. cargo tank welding certification
  3. security awareness training Correct answer.
  4. forklift operator certification

Explanation

49 CFR 172.704 requires hazmat employee training in general awareness/familiarization, function-specific requirements, safety, and security awareness. Security awareness training helps employees recognize and respond to potential security threats involving hazardous materials.

Question 28Hazardous materials regulations and definitions

Hazardous materials are placed in an overpack, and the required markings and labels on the inner packages are not visible. What marking must appear on the overpack?

  1. OVERPACK Correct answer.
  2. THIS SIDE UP
  3. CARGO TANK
  4. LIMITED QUANTITY

Explanation

Under 49 CFR 173.25, an overpack must be marked with the word 'OVERPACK' unless the required markings and labels on the inner packages are visible. 'THIS SIDE UP' is an orientation marking, 'CARGO TANK' identifies a bulk vehicle, and 'LIMITED QUANTITY' applies only when the package meets limited-quantity requirements.

Question 29Hazardous materials regulations and definitions

A package of radioactive material has a transport index of 0.5. Which hazard label must be applied to the package?

  1. RADIOACTIVE II-YELLOW Correct answer.
  2. No radioactive label is required because the transport index is below 1.0
  3. RADIOACTIVE III-YELLOW
  4. RADIOACTIVE I-WHITE

Explanation

Radioactive package labels are assigned by transport index: Category I-WHITE requires a transport index of zero, Category II-YELLOW applies above zero through 1.0, and Category III-YELLOW applies above 1.0 through 10.0. A transport index of 0.5 therefore requires the RADIOACTIVE II-YELLOW label.

Question 30Hazardous materials regulations and definitions

Which material meets the HMR definition of an elevated temperature material when offered in a bulk packaging?

  1. A solid at 200 °C (392 °F)
  2. A liquid at 90 °C (194 °F)
  3. A gas at 50 °C (122 °F)
  4. A liquid at 105 °C (221 °F) Correct answer.

Explanation

Under 49 CFR 171.8, an elevated temperature material in bulk includes a liquid at or above 100 °C (212 °F), a liquid intentionally heated and transported at or above its flash point, or a solid at or above 240 °C (464 °F). A liquid at 105 °C meets the liquid threshold, while the 90 °C liquid, 200 °C solid, and 50 °C gas do not.

Question 31Hazardous materials regulations and definitions

A hazardous material is assigned to Division 2.3 under the HMR. Which property places it in that division?

  1. It is an oxidizing gas
  2. It is toxic by inhalation Correct answer.
  3. It is nonflammable and does not support combustion
  4. It is flammable when mixed with air

Explanation

Division 2.3 covers gases that are toxic to humans. Flammable gases are Division 2.1, nonflammable gases are Division 2.2, and oxidizing gases are Class 5.1 with a Division 2.2 subsidiary hazard. A gas meeting the toxicity criteria takes Division 2.3 as its primary hazard.

Question 32Hazardous materials regulations and definitions

Under the HMR, placards must be displayed on a motor vehicle when the vehicle:

  1. carries any package visible from outside the vehicle
  2. crosses a state boundary with hazardous materials
  3. carries more than 1,000 pounds of any cargo
  4. contains a quantity of hazardous material that requires placarding Correct answer.

Explanation

49 CFR 172.504 requires placards on each side and each end of a transport vehicle when it contains a hazardous material in a quantity that triggers placarding. The requirement applies whether the movement is intrastate or interstate, and it does not depend on whether packages are visible.

Question 33Hazardous materials regulations and definitions

A hazmat shipper provides a shipping paper for a shipment. Under the HMR, how long must the shipper retain a copy?

  1. 5 years
  2. 2 years Correct answer.
  3. 90 days
  4. 1 year

Explanation

49 CFR 172.201(e) requires each person who provides a shipping paper to retain a copy for two years. The retention period supports enforcement and incident investigation; it is not tied to the length of the trip.

Question 34Hazardous materials regulations and definitions

A shipping paper lists an emergency response telephone number for a hazardous material. Under the HMR, that number must be:

  1. a toll-free number
  2. the shipper's main office number, answered during business hours
  3. answered by a recording after normal business hours
  4. monitored at all times while the material is in transportation Correct answer.

Explanation

49 CFR 172.604 requires the emergency response telephone number to be monitored at all times while the hazardous material is in transportation, including storage incidental to movement. An answering machine or a number monitored only during business hours does not satisfy the rule.

Question 35Hazardous materials regulations and definitions

A material causes full-thickness destruction of intact skin tissue under the HMR test criteria. To which hazard class is it assigned?

  1. Class 6.1
  2. Class 5.1
  3. Class 9
  4. Class 8 Correct answer.

Explanation

Class 8 covers corrosive materials, including those that cause full-thickness destruction of skin tissue within the specified observation period. Class 6.1 covers toxic materials, Class 5.1 covers oxidizers, and Class 9 covers miscellaneous hazardous materials.

Question 36Hazardous materials regulations and definitions

A package is offered by highway as a limited quantity under the HMR. Which marking must the package bear?

  1. A CONSUMER COMMODITY mark
  2. An ORM-D mark
  3. A square-on-point LQ mark Correct answer.
  4. LIMITED QUANTITY text

Explanation

49 CFR 172.315 requires limited quantity packages to bear the square-on-point limited quantity marking. ORM-D and consumer commodity markings are separate authorized markings with different eligibility rules and are not the limited quantity marking.

Question 37Hazardous materials regulations and definitions

A carrier learns of a hazardous material incident that requires immediate notice under 49 CFR 171.15. By when must the carrier make the telephonic report to the National Response Center?

  1. Within 30 minutes of discovery
  2. As soon as practicable but no later than 12 hours Correct answer.
  3. Within 30 days, on Form 5800.1
  4. Within 24 hours of discovery

Explanation

Section 171.15 requires immediate notice to the National Response Center as soon as practicable but no later than 12 hours after the incident. A written report on DOT Form 5800.1 is separately required within 30 days under §171.16.

Question 38Hazardous materials regulations and definitions

A mixture contains a material listed in appendix B to §172.101 that is not identified as a severe marine pollutant. What concentration by weight makes the mixture a marine pollutant under the HMR?

  1. 25 percent
  2. 0.1 percent
  3. 10 percent Correct answer.
  4. 1 percent

Explanation

Under 49 CFR 171.8, a mixture containing a listed marine pollutant is a marine pollutant at a concentration of 10 percent by weight or more. The lower 1 percent threshold applies only when the listed material is identified as a severe marine pollutant.

Question 39Hazardous materials regulations and definitions

For a liquid hazardous material, what capacity threshold makes a packaging a bulk packaging under the HMR?

  1. More than 1,000 L (264 gal)
  2. More than 450 L (119 gal) Correct answer.
  3. More than 400 kg (882 lb)
  4. More than 220 L (58 gal)

Explanation

49 CFR 171.8 defines a bulk packaging by capacity: greater than 450 L (119 gallons) for a liquid, greater than 400 kg (882 pounds) for a solid, and greater than 454 kg (1,000 pounds) for a gas. The 400 kg figure applies to solids, not liquids.

Question 40Hazardous materials regulations and definitions

A material is assigned to Division 4.3 under the HMR. Which description fits that division?

  1. A flammable solid that burns readily
  2. An oxidizer that can ignite other materials
  3. A material that is spontaneously combustible in air
  4. A material that emits flammable gas on contact with water Correct answer.

Explanation

Division 4.3 covers dangerous-when-wet materials, which emit flammable gas when they contact water. Division 4.1 covers flammable solids, Division 4.2 covers spontaneously combustible materials, and Class 5.1 covers oxidizers.

Question 41Hazardous materials regulations and definitions

When a shipping paper is prepared for a hazardous material, in what order must the basic description elements appear?

  1. Proper shipping name, hazard class or division, packing group, identification number
  2. Packing group, identification number, proper shipping name, hazard class or division
  3. Hazard class or division, packing group, identification number, proper shipping name
  4. Identification number, proper shipping name, hazard class or division, packing group Correct answer.

Explanation

The basic description on a shipping paper follows a fixed sequence: identification number first, then the proper shipping name, then the hazard class or division, and finally the packing group. An entry such as 'UN 1993, Flammable liquid, n.o.s., 3, PG II' illustrates this required order.

Question 42Hazardous materials regulations and definitions

While operating a vehicle that contains hazardous materials, where must the driver keep the shipping paper?

  1. Mailed to the consignee before departure
  2. Within the driver's immediate reach in the cab Correct answer.
  3. Locked in the cargo compartment of the trailer
  4. Filed at the carrier's home terminal

Explanation

Under 49 CFR 177.817, the shipping paper must be within the driver's immediate reach while the driver is restrained by the seat belt, and it is normally kept in a holder on the driver's door or within reach. Keeping it in the cab lets enforcement personnel and emergency responders see it without delay.

Question 43Hazardous materials regulations and definitions

Which person meets the HMR definition of a hazmat employee?

  1. A person who only receives hazmat packages at a final destination
  2. A person who directly affects hazmat transportation safety, such as a loader or unloader Correct answer.
  3. A person who transports empty, unmarked packages
  4. A person who sells hazmat to consumers at a retail store

Explanation

The HMR define a hazmat employee as a person who directly affects hazardous materials transportation safety, including anyone who loads, unloads, handles, tests, or prepares hazmat packages and shipping papers. Retail sellers, final recipients, and people handling only empty unmarked packages are outside that definition.

Question 44Hazardous materials regulations and definitions

A non-bulk package contains a hazardous substance in a quantity that equals or exceeds its reportable quantity. How is this shown on the shipping paper?

  1. The letters 'RQ' are entered before the basic description or in association with it Correct answer.
  2. No notation is needed if the package is non-bulk
  3. The letters 'RQ' are placed after the packing group only
  4. The word 'HAZARDOUS' is stamped at the top of the page

Explanation

Section 172.203(m) requires the letters 'RQ' to appear either before the basic description or in association with it when a hazardous substance is present at or above its reportable quantity. The notation alerts carriers and responders that a CERCLA reportable quantity may be released.

Question 45Hazardous materials regulations and definitions

A material is a 'hazardous substance' under the HMR when it is listed in Appendix A to §172.101 and which condition is met?

  1. It is offered by a shipper who holds a PHMSA registration
  2. It is transported only in a bulk packaging
  3. It is present in one package in a quantity equal to or greater than its reportable quantity Correct answer.
  4. It has a flash point below 60 °C (140 °F)

Explanation

A hazardous substance is a material listed in Appendix A to §172.101 that is present in one package in a quantity equal to or greater than its reportable quantity. Mixtures and solutions must also meet the concentration criteria in the definition.

Question 46Hazardous materials regulations and definitions

A material is assigned to Division 4.2 with a subsidiary hazard of Class 8. Which labels must be on the package?

  1. The Division 4.2 label and a Class 8 subsidiary label Correct answer.
  2. Only the Class 8 label
  3. A single DANGER placard in place of labels
  4. Only the Division 4.2 label

Explanation

When a material has more than one hazard, the package must display the primary hazard label and a subsidiary label for each additional hazard. Division 4.2 is the primary hazard here, and Class 8 is subsidiary.

Question 47Hazardous materials regulations and definitions

A fiberboard box bears a UN packaging certification marking that includes '4G/Y'. For which packing groups is the box authorized?

  1. Packing Groups II and III Correct answer.
  2. Packing Group III only
  3. Packing Group I only
  4. Packing Groups I, II, and III

Explanation

In the UN packaging certification marking, the letter X authorizes Packing Groups I, II, and III; Y authorizes Packing Groups II and III; and Z authorizes Packing Group III only. Thus 4G/Y indicates a fiberboard box suitable for Packing Groups II and III.

Question 48Hazardous materials regulations and definitions

A generator offers hazardous waste for highway transportation. Which shipping document must accompany the shipment?

  1. A bill of lading with no hazmat notation
  2. A shipper's declaration for dangerous goods only
  3. The uniform hazardous waste manifest Correct answer.
  4. A cargo tank test certificate

Explanation

Hazardous waste offered for highway transportation must be accompanied by the uniform hazardous waste manifest, EPA Form 8700-22, which tracks the waste from generator to treatment, storage, or disposal facility. A bill of lading or a dangerous goods declaration alone does not satisfy this requirement.

Question 49Hazardous materials regulations and definitions

In Column 1 of the Hazardous Materials Table, a '+' symbol next to an entry indicates that the entry's proper shipping name is:

  1. Mandatory and may not be replaced by a generic n.o.s. name Correct answer.
  2. Forbidden for highway transportation
  3. Permitted only for international shipments
  4. Subject to the reportable quantity rules

Explanation

A '+' in Column 1 of the Hazardous Materials Table means the proper shipping name is fixed and must be used; a generic n.o.s. entry may not be substituted. This ensures the shipping description matches the regulated material precisely.

Question 50Hazardous materials regulations and definitions

A gas poisonous by inhalation has an LC50 (1 hour) of 100 ppm. To which inhalation hazard zone is it assigned?

  1. Zone B
  2. Zone C
  3. Zone D
  4. Zone A Correct answer.

Explanation

For gases poisonous by inhalation, Hazard Zone A covers materials with an LC50 of 200 ppm or less for a one-hour exposure. A gas at 100 ppm therefore falls in Zone A, the most stringent zone.