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Hazmat Awareness practice questions

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Question 1Hazardous Materials Laws, Regulations, and Standards

Under the DOT Hazardous Materials Regulations, regulated materials are assigned to how many hazard classes?

  1. Ten
  2. Seven
  3. Nine Correct answer.
  4. Eight

Explanation

The DOT framework in 49 CFR Part 173 divides hazardous materials into nine hazard classes, several of which are further split into divisions (for example, Class 1 contains Divisions 1.1 through 1.6). Class 1 covers explosives and Class 9 covers miscellaneous hazardous materials. The class assignment drives placarding, packaging, and the emergency response guide selection.

Question 2Hazardous Materials Laws, Regulations, and Standards

In the NFPA 704 hazard identification system, the blue quadrant indicates which type of hazard?

  1. Health Correct answer.
  2. Flammability
  3. Instability
  4. Special hazards

Explanation

NFPA 704 uses a four-quadrant diamond: blue for health hazard, red for flammability, yellow for instability (reactivity), and white for special hazards such as oxidizers or water-reactive materials. The number in each quadrant rates severity from 0 to 4. Responders read the diamond before committing personnel.

Question 3Hazardous Materials Laws, Regulations, and Standards

Which section of the Emergency Response Guidebook lists hazardous materials in numerical order by their four-digit identification number?

  1. Green pages
  2. Yellow-bordered pages Correct answer.
  3. Blue-bordered pages
  4. White pages

Explanation

The ERG organizes entries so responders can look up a material either by its four-digit identification number on the yellow-bordered pages or by its proper shipping name on the blue-bordered pages. Once the guide number is found, the orange-bordered pages give response guidance. The green pages provide isolation and protective action distances for toxic inhalation hazards.

Question 4Hazardous Materials Laws, Regulations, and Standards

A highway vehicle displaying a Hazard Class 1 placard is carrying which type of material?

  1. Explosives Correct answer.
  2. Organic peroxide
  3. Corrosive liquid
  4. Flammable gas

Explanation

Hazard Class 1 is reserved for explosives under 49 CFR 173, and the class is subdivided into six compatibility-related divisions. Flammable gases fall in Class 2, organic peroxides in Class 5.2, and corrosives in Class 8. Recognizing the class lets responders anticipate blast and fragment hazards before approaching.

Question 5Hazardous Materials Laws, Regulations, and Standards

Which federal law established the 'cradle-to-grave' system for managing hazardous waste?

  1. RCRA Correct answer.
  2. CERCLA
  3. CAA
  4. TSCA

Explanation

The Resource Conservation and Recovery Act (RCRA) created a system that follows hazardous waste from the point of generation through transport, treatment, storage, and disposal. CERCLA, by contrast, addresses releases and cleanup of hazardous substances. TSCA and the Clean Air Act regulate industrial chemicals and air emissions rather than waste tracking.

Question 6Hazardous Materials Laws, Regulations, and Standards

Under OSHA's Hazard Communication Standard, who is responsible for developing and providing Safety Data Sheets for a hazardous chemical?

  1. The local fire department
  2. The manufacturer or importer Correct answer.
  3. The employer using the chemical
  4. The receiving warehouse

Explanation

The Hazard Communication Standard requires chemical manufacturers and importers to obtain or develop an SDS for each hazardous chemical they produce or bring into the country and to provide it downstream. Employers must then maintain the sheets and make them accessible to workers. Distributors pass the SDS along with the product.

Question 7Hazardous Materials Laws, Regulations, and Standards

A UN identification number assigned to a hazardous material entry consists of how many digits?

  1. Three
  2. Two
  3. Four Correct answer.
  4. Five

Explanation

UN identification numbers are four-digit codes, such as UN1203 for gasoline, and they appear on shipping papers, packages, and orange panels. The same four-digit number indexes the material in the yellow-bordered pages of the Emergency Response Guidebook. Some domestic entries use an NA prefix but retain the four-digit format.

Question 8Hazardous Materials Laws, Regulations, and Standards

Which agency within the U.S. Department of Transportation issues the Hazardous Materials Regulations found in 49 CFR Parts 171 through 180?

  1. Federal Motor Carrier Safety Administration
  2. U.S. Coast Guard
  3. Federal Railroad Administration
  4. PHMSA Correct answer.

Explanation

The Pipeline and Hazardous Materials Safety Administration (PHMSA) writes and maintains the Hazardous Materials Regulations in 49 CFR Parts 171 through 180. Modal agencies such as FMCSA, FRA, and the Coast Guard enforce those rules within their modes. Knowing the split helps a responder or shipper cite the right authority.

Question 9Hazardous Materials Laws, Regulations, and Standards

For materials listed in Table 2 of 49 CFR 172.504, placards must be displayed when the aggregate gross weight of all hazardous materials in the transport vehicle reaches at least:

  1. 10,000 pounds
  2. 2,205 pounds
  3. 500 pounds
  4. 1,001 pounds Correct answer.

Explanation

Table 2 materials require placards once the aggregate gross weight of all hazardous materials aboard reaches 1,001 pounds. Materials listed in Table 1 must be placarded regardless of quantity. The 2,205-pound figure equals one metric ton and is not the placarding trigger.

Question 10Hazardous Materials Laws, Regulations, and Standards

Under CERCLA, a release of a hazardous substance that equals or exceeds its reportable quantity must be reported immediately to which organization?

  1. The local water authority
  2. The National Response Center Correct answer.
  3. The Department of Energy
  4. The state environmental agency

Explanation

CERCLA Section 103 requires immediate notification of a release of a hazardous substance at or above its reportable quantity to the National Response Center, which is staffed around the clock. State and local agencies may also require notification under their own rules. The RQ is a substance-specific value published in 40 CFR 302.

Question 11Hazardous Materials Laws, Regulations, and Standards

At the first responder awareness level under OSHA's HAZWOPER standard, a responder is expected to:

  1. Contain the spill with absorbents
  2. Enter the hot zone to rescue victims
  3. Decontaminate exposed victims
  4. Recognize the hazard and isolate the area Correct answer.

Explanation

Awareness-level responders are trained to recognize the presence of hazardous materials, identify the material if it can be done safely, notify the proper authorities, and isolate the area or deny entry. They take no defensive or offensive action. Containment and rescue belong to higher response levels.

Question 12Hazardous Materials Laws, Regulations, and Standards

Under the community right-to-know law, the local body responsible for developing emergency response plans for hazardous chemicals in the community is the:

  1. Local Emergency Planning Committee Correct answer.
  2. U.S. Chemical Safety Board
  3. State department of transportation
  4. Occupational Safety and Health Administration

Explanation

The Emergency Planning and Community Right-to-Know Act, or SARA Title III, establishes Local Emergency Planning Committees with responsibility for preparing community chemical emergency plans. Facilities subject to the law submit chemical inventories and SDSs to the committee, the state emergency response commission, and the local fire department. State DOTs, OSHA, and the Chemical Safety Board have different roles.

Question 13Hazardous Materials Laws, Regulations, and Standards

Under the hazardous materials regulations, the emergency response telephone number listed on a shipping paper must be:

  1. Answered only during business hours
  2. Verified once by the carrier
  3. Monitored at all times during transport Correct answer.
  4. Recorded on the vehicle's placard

Explanation

The listed number must be monitored continuously whenever the material is in transportation, including storage incidental to movement, and must be answered by someone knowledgeable about the material or with immediate access to such information. A number that only works during office hours does not satisfy the rule. Placards carry no telephone numbers.

Question 14Hazardous Materials Laws, Regulations, and Standards

How often must a hazmat employee complete recurrent training under the DOT hazardous materials regulations?

  1. Every 3 years Correct answer.
  2. Only once at hire
  3. Every 5 years
  4. Every year

Explanation

Recurrent training is required at least once every three years for each hazmat employee. The training must cover general awareness and function-specific topics, plus safety and, where applicable, security awareness. Records of training must be kept for the same interval.

Question 15Hazardous Materials Laws, Regulations, and Standards

What information do the orange-bordered pages of the Emergency Response Guidebook provide?

  1. Isolation distances and protective actions Correct answer.
  2. Reporting requirements for carriers
  3. The names of material manufacturers
  4. Chemical and physical properties of each material

Explanation

Each orange page is a numbered guide that describes potential hazards, public safety concerns, protective clothing, evacuation guidance, and emergency response actions for a group of materials with similar behavior. Responders reach the correct guide through the yellow or blue pages. Detailed chemical properties and reporting rules are not part of the guide entries.

Question 16Hazardous Materials Laws, Regulations, and Standards

What is the regulatory purpose of the uniform hazardous waste manifest?

  1. To calculate the disposal fee charged
  2. To transfer legal ownership to the transporter
  3. To certify that the waste is nonhazardous
  4. To track the waste from generator to disposal Correct answer.

Explanation

The manifest follows a hazardous waste shipment from the generator through each transporter to the designated treatment, storage, or disposal facility. Every handler signs and retains copies, and the generator must resolve any discrepancy or missing return copy. It is the documentary backbone of cradle-to-grave tracking.

Question 17Hazardous Materials Laws, Regulations, and Standards

A drum bears a placard displaying Hazard Class 8. Which hazard should a responder expect?

  1. Flammable solid
  2. Corrosive Correct answer.
  3. Oxidizing gas
  4. Toxic gas

Explanation

Hazard Class 8 covers corrosive materials that destroy skin or corrode steel and aluminum. Flammable solids are Class 4.1, toxic gases are Division 2.3, and oxidizing gases fall within Class 2. Corrosives present both contact injury and container-failure concerns.

Question 18Hazardous Materials Laws, Regulations, and Standards

Under OSHA's Hazard Communication Standard, a shipped container label must include which of the following?

  1. A signal word, hazard statement, and pictograms Correct answer.
  2. The OSHA inspection number
  3. The ERG guide number
  4. The written hazard communication program

Explanation

Labels prepared under the GHS-aligned standard must show the product identifier, signal word, hazard statements, pictograms, precautionary statements, and supplier information. The label travels with the container; the written program stays at the workplace. ERG guide numbers and inspection numbers are not label elements.

Question 19Hazardous Materials Laws, Regulations, and Standards

To obtain a hazardous materials endorsement on a commercial driver's license, a driver must first complete which of the following?

  1. An EPA hazardous waste handler license
  2. A TSA security threat assessment Correct answer.
  3. A written recommendation from the employer
  4. A state firefighter certification

Explanation

Federal rule requires a security threat assessment through the Transportation Security Administration before a state issues a hazmat endorsement. The driver must also pass the knowledge test and meet the other CDL requirements. No EPA-issued handler license exists for drivers.

Question 20Hazardous Materials Laws, Regulations, and Standards

A newly hired hazmat employee who has not yet completed required training may perform hazmat functions only within what period of employment, and only under direct supervision?

  1. 90 days Correct answer.
  2. 15 days
  3. 30 days
  4. 60 days

Explanation

The regulations allow a new hazmat employee to perform functions under direct supervision for no more than 90 days while training is completed. After that, the employee must be trained and certified. The certification documents that training was completed.

Question 21Hazardous Materials Laws, Regulations, and Standards

Under Section 112(r) of the Clean Air Act, a facility holding more than the threshold quantity of a regulated flammable or toxic substance must:

  1. Develop a risk management plan Correct answer.
  2. Submit a hazardous waste manifest
  3. Obtain a DOT hazmat permit
  4. Register with the local fire department only

Explanation

Section 112(r) requires facilities with regulated substances above threshold quantities to prepare a Risk Management Plan covering hazard assessment, prevention, and emergency response. The plan is submitted to EPA and made available to state and local officials. It is separate from DOT transportation permits and RCRA waste manifests.

Question 22Hazardous Materials Laws, Regulations, and Standards

The Spill Prevention, Control, and Countermeasure rule under the Clean Water Act applies primarily to facilities that:

  1. Store oil above specified capacity thresholds Correct answer.
  2. Generate more than 1,000 kg of hazardous waste monthly
  3. Discharge treated wastewater to a river
  4. Transport placarded quantities by highway

Explanation

The SPCC rule applies to non-transportation facilities with total aboveground oil storage capacity above 1,320 gallons or buried capacity above 42,000 gallons, where a discharge could reach navigable waters. Covered facilities must prepare a plan certified by a registered professional engineer. Hazardous waste generation and vehicle placarding are governed by other programs.

Question 23Hazardous Materials Laws, Regulations, and Standards

Under the DOT hazardous materials regulations, security awareness training for hazmat employees must address:

  1. Waste minimization and recycling methods
  2. Recognizing and responding to security threats Correct answer.
  3. Firefighting tactics for flammable liquid fires
  4. The chemistry of each material handled

Explanation

Security awareness training must cover the security risks associated with hazardous materials transportation and the actions employees should take to recognize and respond to a possible security threat. It is in addition to general awareness, function-specific, and safety training. It does not replace technical or firefighting instruction.

Question 24Hazardous Materials Laws, Regulations, and Standards

Under the DOT hazardous materials regulations, a transport incident must be reported immediately to the National Response Center when it involves:

  1. A delivery delay exceeding 24 hours
  2. Evacuation of the public for one hour or more Correct answer.
  3. Any spill of any size onto a roadway
  4. A shipping paper missing its emergency number

Explanation

Immediate notification criteria include death, injury requiring hospitalization, evacuation of the general public for one hour or more, closure of a major transportation artery for an hour or more, and certain radioactive or infectious material events. The size of a spill alone does not trigger the immediate report. Commercial delays and paperwork defects are handled through other provisions.

Question 25Hazardous Materials Laws, Regulations, and Standards

Under RCRA, a facility that generates between 100 and 1,000 kilograms of hazardous waste per month is classified as a:

  1. Large quantity generator
  2. Universal waste handler
  3. Small quantity generator Correct answer.
  4. Conditionally exempt generator

Explanation

Generator status is set by monthly generation rate: 1,000 kilograms or more per month makes a large quantity generator, 100 to 1,000 kilograms makes a small quantity generator, and less than 100 kilograms falls into the very small or conditionally exempt category. Each category carries different accumulation time limits and paperwork obligations. Universal waste handler describes a specific waste stream, not a generator size.

Question 26Hazardous Materials Laws, Regulations, and Standards

When the letters RQ appear as part of a package marking or a shipping paper entry, what does that indicate about the material?

  1. It may be offered only under a special permit issued by PHMSA
  2. It is packaged as a limited quantity intended for highway transport only
  3. It is a hazardous substance at or above its reportable quantity Correct answer.
  4. It requires temperature control for the duration of the trip

Explanation

The letters RQ identify a hazardous substance that is present in a quantity equal to or greater than its reportable quantity under CERCLA. Shippers must add RQ to the basic description on the shipping paper and mark packages accordingly.

Question 27Hazardous Materials Laws, Regulations, and Standards

A rail car bears a placard displaying Hazard Class 3. Which hazard does this class represent?

  1. A corrosive material that destroys skin on contact
  2. A flammable or combustible liquid Correct answer.
  3. An oxidizing gas that supports combustion
  4. An organic peroxide requiring temperature control

Explanation

Hazard Class 3 covers flammable and combustible liquids, generally those with a flash point at or below 60 degrees Celsius (140 degrees Fahrenheit). The placard also carries the division number for the specific flash point range.

Question 28Hazardous Materials Laws, Regulations, and Standards

Which description best matches the role of a hazardous materials responder trained to the operations level?

  1. Enters the hot zone to stop the release at its source
  2. Assumes command of the incident and directs all tactical operations
  3. Responds defensively to contain the release from a safe distance Correct answer.
  4. Performs only notification duties without approaching the scene

Explanation

Operations-level responders are trained to respond defensively, containing a release from a safe distance without attempting to stop it at the source. Offensive actions inside the hot zone and overall command of the incident require additional training.

Question 29Hazardous Materials Laws, Regulations, and Standards

Which federal agency has primary responsibility for regulating hazardous waste from the point of generation to final disposal under RCRA?

  1. The U.S. Environmental Protection Agency Correct answer.
  2. The Occupational Safety and Health Administration
  3. The Federal Motor Carrier Safety Administration
  4. The Nuclear Regulatory Commission

Explanation

RCRA is administered by the U.S. Environmental Protection Agency, which sets the cradle-to-grave requirements for hazardous waste generation, transportation, treatment, storage, and disposal. The Department of Transportation regulates only the transportation phase.

Question 30Hazardous Materials Laws, Regulations, and Standards

Which of these is one of the training components required for hazmat employees by 49 CFR 172.704?

  1. Confined space rescue certification
  2. Incident command system certification
  3. Fire brigade leadership training
  4. Security awareness training Correct answer.

Explanation

Section 172.704 requires general awareness and familiarization training, function-specific training, safety training, and security awareness training. Every hazmat employee must be trained in all four components.

Question 31Hazardous Materials Laws, Regulations, and Standards

Under EPCRA Section 304, a facility that releases a reportable quantity of an extremely hazardous substance must immediately notify the National Response Center and which other bodies?

  1. The nearest OSHA area office and the state fire marshal's office
  2. The U.S. Chemical Safety Board and the county public health department
  3. The Nuclear Regulatory Commission and the state environmental agency
  4. The state emergency response commission and the local planning committee Correct answer.

Explanation

EPCRA Section 304 requires immediate notification of the State Emergency Response Commission and the Local Emergency Planning Committee for releases of reportable quantities of hazardous substances, in addition to the CERCLA notification to the National Response Center.

Question 32Hazardous Materials Laws, Regulations, and Standards

A facility required to submit an EPCRA Tier II hazardous chemical inventory report must file it with state and local agencies by which date each year?

  1. June 30
  2. December 31
  3. March 1 Correct answer.
  4. January 1

Explanation

Tier II inventory reports covering the previous calendar year are due by March 1 to the State Emergency Response Commission, the Local Emergency Planning Committee, and the local fire department.

Question 33Hazardous Materials Laws, Regulations, and Standards

Under 49 CFR, how long must a shipper keep a copy of a hazardous materials shipping paper after the shipment is offered?

  1. 2 years Correct answer.
  2. 6 months
  3. 5 years
  4. 30 days

Explanation

Section 172.201(e) requires the shipper to retain a copy of the shipping paper for two years, and it must be available for inspection by authorized officials during that period.

Question 34Hazardous Materials Laws, Regulations, and Standards

A cylinder bears a Division 2.3 label. What hazard does this indicate?

  1. A nonflammable gas that can asphyxiate
  2. A gas that is flammable at ambient temperature
  3. A liquid that gives off flammable vapor
  4. A gas that is toxic by inhalation Correct answer.

Explanation

Division 2.3 covers gases that are toxic by inhalation and is the highest-priority hazard within Class 2. Such gases also carry subsidiary labels, such as a flammable gas label, when those hazards apply.

Question 35Hazardous Materials Laws, Regulations, and Standards

A small quantity generator that accumulates hazardous waste on site without a permit may normally keep that waste for no more than how long?

  1. 1 year
  2. 90 days
  3. 270 days
  4. 180 days Correct answer.

Explanation

Small quantity generators may accumulate hazardous waste on site for up to 180 days. The limit extends to 270 days when the waste must be transported more than 200 miles to a permitted treatment, storage, and disposal facility.

Question 36Hazardous Materials Laws, Regulations, and Standards

Under OSHA's HAZWOPER standard, hazardous materials technicians must complete at least how many hours of initial training?

  1. 24 hours Correct answer.
  2. 16 hours
  3. 40 hours
  4. 8 hours

Explanation

Hazardous materials technicians must complete at least 24 hours of initial training combining classroom instruction with hands-on field experience, followed by an annual 8-hour refresher.

Question 37Hazardous Materials Laws, Regulations, and Standards

Before offering a hazardous material for transportation, what must the offeror ensure under 49 CFR 171.2?

  1. The material is insured by a carrier approved by the Federal Motor Carrier Safety Administration
  2. The material is listed on the state emergency planning commission's inventory
  3. The material is classed, described, packaged, marked, and labeled as required Correct answer.
  4. The material has been inspected by a licensed third-party packaging surveyor

Explanation

Section 171.2 prohibits offering a hazardous material unless it has been properly classed, described, packaged, marked, and labeled and is in condition for shipment. The offeror certifies this on the shipping paper.

Question 38Hazardous Materials Laws, Regulations, and Standards

After a hazardous materials transport incident that required immediate notice, within how many days must the carrier submit the written follow-up report on DOT Form 5800.1?

  1. 30 days Correct answer.
  2. 10 days
  3. 15 days
  4. 60 days

Explanation

A written report on DOT Form 5800.1 must be submitted to PHMSA within 30 days of the incident date, documenting the circumstances, the material involved, and the response actions taken.

Question 39Hazardous Materials Laws, Regulations, and Standards

Under HAZWOPER, an employee must be included in a medical surveillance program when the employee:

  1. holds a current respirator fit test record
  2. works at any hazardous waste site for more than one shift
  3. completes the annual refresher training
  4. is exposed above the PEL for 30 or more days per year Correct answer.

Explanation

The HAZWOPER standard requires medical surveillance for employees exposed to hazardous substances above the permissible exposure limit for 30 or more days per year, for employees who wear a respirator 30 or more days per year, and for members of hazardous materials teams.

Question 40Hazardous Materials Laws, Regulations, and Standards

A material assigned to Hazard Zone A in the hazardous materials table is best described as one that:

  1. is corrosive to metal but poses little inhalation risk
  2. becomes hazardous only when it is heated
  3. is toxic only when it is ingested or absorbed
  4. poses the greatest inhalation hazard in a release Correct answer.

Explanation

Hazard Zones A through D rank toxic inhalation hazard materials by severity, with Zone A representing gases of the highest inhalation toxicity and greatest transport risk. Zone A materials carry the most restrictive handling, routing, and special provisions.

Question 41Recognition, Identification, and Classification of Hazardous Materials

What is the primary purpose of a diamond-shaped placard displayed on a transport vehicle?

  1. To name the manufacturer that produced the shipped material
  2. To show the expiration date of the vehicle's inspection permit
  3. To record the total weight of the shipment inside the vehicle
  4. To identify the primary hazard class of the load Correct answer.

Explanation

Placards are hazard communication tools; the color, symbol, and text on the diamond tell responders the primary hazard class of the material being carried. Placards do not convey shipment weight, manufacturer identity, or vehicle inspection data.

Question 42Recognition, Identification, and Classification of Hazardous Materials

In the NFPA 704 marking system, the blue section of the diamond represents which hazard?

  1. Special hazards such as oxidizers
  2. Health hazard of the material Correct answer.
  3. Flammability of the material
  4. Reactivity or instability

Explanation

NFPA 704 assigns blue to health, red to flammability, yellow to instability, and white to special hazards. The blue field therefore rates the health hazard a material presents to people.

Question 43Recognition, Identification, and Classification of Hazardous Materials

Gasoline, acetone, and similar liquids with a low flash point are assigned to which DOT hazard class?

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

Explanation

DOT Class 3 covers flammable liquids, generally those with a flash point at or below 140 degrees F, along with certain combustible liquids. Gasoline and acetone are familiar examples of Class 3 materials.

Question 44Recognition, Identification, and Classification of Hazardous Materials

In the Emergency Response Guidebook, the yellow-bordered pages list materials by which entry?

  1. The proper shipping name of the material
  2. The four-digit identification number of the material Correct answer.
  3. The hazard class shown on the placard
  4. The response guide number for the material

Explanation

The yellow-bordered pages are a numerical index sorted by four-digit UN or NA identification number. The blue-bordered pages serve as the alphabetical index by proper shipping name, and the orange pages hold the response guides.

Question 45Recognition, Identification, and Classification of Hazardous Materials

A white placard bearing a skull and crossbones identifies a material that is:

  1. Infectious
  2. Poisonous Correct answer.
  3. Corrosive
  4. Flammable

Explanation

The skull and crossbones is the symbol for Class 6.1 poisonous material. Infectious substances use a biohazard symbol, corrosives show damage to skin or metal, and flammables show a flame.

Question 46Recognition, Identification, and Classification of Hazardous Materials

Materials in DOT Class 8 are primarily hazardous because they:

  1. emit ionizing radiation during transport
  2. release oxygen and accelerate combustion
  3. ignite readily at normal outdoor temperatures
  4. destroy skin tissue or corrode metal containers Correct answer.

Explanation

Class 8 is the corrosive class; these materials cause visible destruction of skin at the contact site or severely corrode steel or aluminum. This dual definition is why corrosives are ranked by both tissue damage and metal loss.

Question 47Recognition, Identification, and Classification of Hazardous Materials

A placard or shipping description marked INHALATION HAZARD warns responders that the material:

  1. is toxic when inhaled Correct answer.
  2. is harmful only when swallowed or absorbed
  3. reacts violently on contact with water
  4. damages metal piping and tank interiors

Explanation

The inhalation hazard designation identifies a material that is toxic when breathed in as a gas, vapor, or mist. These materials drive the special isolation and protective action distances found in the guidebook.

Question 48Recognition, Identification, and Classification of Hazardous Materials

Which background color identifies the DOT oxidizer placard?

  1. Red
  2. White
  3. Yellow Correct answer.
  4. Blue

Explanation

The Class 5.1 oxidizer placard has a yellow background with a flame-over-circle symbol. Red is used for flammable solids and liquids, white for poison and inhalation hazards, and blue for dangerous-when-wet materials.

Question 49Recognition, Identification, and Classification of Hazardous Materials

In the Emergency Response Guidebook, initial isolation and protective action distances are provided for which materials?

  1. Materials that are corrosive to metals
  2. Materials that are radioactive
  3. Materials that are flammable liquids
  4. Materials that are toxic when inhaled Correct answer.

Explanation

The green-bordered pages give table-based isolation and protective action distances, and they cover materials that are toxic by inhalation, including those also reactive with water. Flammable, corrosive, and radioactive materials are handled through the orange guide pages without these distance tables.

Question 50Recognition, Identification, and Classification of Hazardous Materials

On a hazardous materials shipping paper, which arrangement follows the required order of the basic description?

  1. UN number, proper shipping name, hazard class, packing group Correct answer.
  2. Proper shipping name, UN number, packing group, hazard class
  3. Packing group, hazard class, proper shipping name, UN number
  4. Hazard class, packing group, UN number, proper shipping name

Explanation

The basic description sequence is the identification number first, then the proper shipping name, then the hazard class, then the packing group. Following this order lets responders read the entry the same way it appears in the guidebook index.