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Canada IMDG Marine DG study materials
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Canada IMDG Marine DG practice questions

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Question 1IMDG Code structure, scope, and legal framework (SOLAS Chapter VII, MARPOL Annex III, Canadian TDG Act and Regulations)

Which international convention gives the IMDG Code its mandatory legal force for packaged dangerous goods carried by sea?

  1. SOLAS Chapter VII Correct answer.
  2. The Chicago Convention
  3. The Basel Convention
  4. MARPOL Annex III

Explanation

SOLAS Chapter VII makes the carriage of packaged dangerous goods mandatory under the IMDG Code, which is adopted by IMO resolution and given effect through national law. MARPOL Annex III covers marine pollutants but does not itself provide the general mandatory framework for all packaged dangerous goods.

Question 2IMDG Code structure, scope, and legal framework (SOLAS Chapter VII, MARPOL Annex III, Canadian TDG Act and Regulations)

In Canada, which statute provides the primary federal authority for regulating the handling, offering for transport, and transport of dangerous goods, including marine modes?

  1. The Hazardous Products Act
  2. The Canadian Environmental Protection Act, 1999
  3. The Transportation of Dangerous Goods Act, 1992 Correct answer.
  4. The Canada Shipping Act, 2001

Explanation

The Transportation of Dangerous Goods Act, 1992 establishes the federal framework for dangerous goods transport in all modes, supported by the Transportation of Dangerous Goods Regulations. The Canada Shipping Act addresses vessel safety and pollution prevention rather than the classification and documentation of dangerous goods consignments.

Question 3IMDG Code structure, scope, and legal framework (SOLAS Chapter VII, MARPOL Annex III, Canadian TDG Act and Regulations)

Which MARPOL annex is the one most directly linked to the IMDG Code's marine pollutant provisions?

  1. Annex III Correct answer.
  2. Annex VI
  3. Annex I
  4. Annex II

Explanation

MARPOL Annex III contains regulations for the prevention of pollution by harmful substances carried by sea in packaged form. The IMDG Code implements Annex III requirements, including marine pollutant identification and documentation.

Question 4IMDG Code structure, scope, and legal framework (SOLAS Chapter VII, MARPOL Annex III, Canadian TDG Act and Regulations)

Under the IMDG Code, which document is normally required to accompany a consignment of dangerous goods and to contain the basic description in the prescribed sequence?

  1. The safety data sheet
  2. The dangerous goods transport document Correct answer.
  3. The bill of lading only
  4. The cargo securing manual

Explanation

The dangerous goods transport document must accompany the consignment and set out the basic description in the sequence prescribed by the Code, such as UN number, proper shipping name, class, and packing group. The bill of lading may reference the shipment but does not replace the required dangerous goods documentation.

Question 5IMDG Code structure, scope, and legal framework (SOLAS Chapter VII, MARPOL Annex III, Canadian TDG Act and Regulations)

Which body adopts amendments to the IMDG Code at the international level?

  1. The World Customs Organization
  2. The International Civil Aviation Organization
  3. The International Labour Organization
  4. The International Maritime Organization Correct answer.

Explanation

The International Maritime Organization is the United Nations specialized agency responsible for maritime safety and pollution prevention, and its committees adopt amendments to the IMDG Code. The Code is then brought into force through SOLAS and implemented nationally, for example by Transport Canada.

Question 6IMDG Code structure, scope, and legal framework (SOLAS Chapter VII, MARPOL Annex III, Canadian TDG Act and Regulations)

Which Canadian regulation sets out the detailed requirements that give effect to dangerous goods transport rules, including adoption of international codes by reference?

  1. The Transportation of Dangerous Goods Regulations Correct answer.
  2. The Vessel Pollution and Dangerous Chemicals Regulations
  3. The Marine Transportation Security Regulations
  4. The Canada Occupational Health and Safety Regulations

Explanation

The Transportation of Dangerous Goods Regulations contain the detailed classification, documentation, packaging, and training requirements that support the Act. They also incorporate international modal codes by reference, which is how IMDG Code requirements apply to marine shipments in Canada.

Question 7IMDG Code structure, scope, and legal framework (SOLAS Chapter VII, MARPOL Annex III, Canadian TDG Act and Regulations)

A shipper is preparing a marine shipment of a substance listed as a marine pollutant. Which statement best reflects the relationship between MARPOL Annex III and the IMDG Code?

  1. Annex III sets the treaty obligation, and the IMDG Code provides the detailed implementing provisions for packaged harmful substances Correct answer.
  2. The IMDG Code replaces Annex III entirely for all ships
  3. Annex III applies only to fishing vessels and has no general application
  4. Annex III applies only to bulk liquids, so the IMDG Code is irrelevant to marine pollutants

Explanation

MARPOL Annex III creates the treaty-level obligation to prevent pollution by harmful substances in packaged form, while the IMDG Code supplies the operational detail such as classification, marking, labelling, and documentation of marine pollutants. The two work together rather than one replacing the other.

Question 8IMDG Code structure, scope, and legal framework (SOLAS Chapter VII, MARPOL Annex III, Canadian TDG Act and Regulations)

Under the TDG Regulations, a person who offers dangerous goods for transport must generally do which of the following before the shipment moves?

  1. Arrange for a government inspector to attend the loading
  2. Obtain a federal permit for every individual consignment
  3. Classify the goods, prepare the required documentation, and ensure the means of containment is appropriate Correct answer.
  4. Notify the nearest port authority of every shipment

Explanation

The TDG framework places duties on the offeror and handler to properly classify, document, package, and label dangerous goods before transport. These duties are ongoing regulatory obligations rather than case-by-case approvals from government.

Question 9IMDG Code structure, scope, and legal framework (SOLAS Chapter VII, MARPOL Annex III, Canadian TDG Act and Regulations)

A consignment is offered for export from Canada by sea. Which statement best describes how the IMDG Code and Canadian TDG requirements interact for that shipment?

  1. Only the IMDG Code applies, and Canadian law has no role once goods are in a port
  2. Neither applies until the vessel leaves Canadian waters
  3. Only the TDG Regulations apply, and the IMDG Code has no legal effect in Canada
  4. Canadian TDG requirements apply domestically, and the IMDG Code governs the international maritime carriage, with TDG Regulations incorporating the Code by reference Correct answer.

Explanation

Canada implements its international maritime obligations by incorporating the IMDG Code into the TDG Regulations, so compliance with the Code is also a domestic regulatory requirement. The two frameworks operate together rather than in isolation.

Question 10IMDG Code structure, scope, and legal framework (SOLAS Chapter VII, MARPOL Annex III, Canadian TDG Act and Regulations)

Which item is the best example of information that the IMDG Code requires to appear in the dangerous goods transport document?

  1. The vessel's IMO number
  2. The proper shipping name and the United Nations number Correct answer.
  3. The charter party reference
  4. The crew list

Explanation

The basic description in the transport document includes elements such as the UN number, proper shipping name, class or division, and packing group where applicable. Vessel and commercial identifiers are not part of that prescribed basic description.

Question 11IMDG Code structure, scope, and legal framework (SOLAS Chapter VII, MARPOL Annex III, Canadian TDG Act and Regulations)

Why does the IMDG Code include a segregation table and stowage requirements?

  1. To determine freight rates for dangerous cargo
  2. To satisfy insurance underwriting requirements
  3. To simplify customs valuation of cargo
  4. To reduce the risk of dangerous interactions between incompatible goods and to protect the ship and persons on board Correct answer.

Explanation

Segregation and stowage rules manage the hazards that arise when incompatible dangerous goods are carried together or placed in unsuitable locations on board. They are safety provisions aimed at protecting the vessel, crew, and environment, not commercial or fiscal purposes.

Question 12IMDG Code structure, scope, and legal framework (SOLAS Chapter VII, MARPOL Annex III, Canadian TDG Act and Regulations)

A company ships a marine pollutant in packaged form from a Canadian port. Which combination of obligations is most consistent with the legal framework?

  1. Compliance with customs tariff classification only
  2. Compliance with IMDG Code marking, labelling, and documentation as incorporated into the TDG Regulations Correct answer.
  3. Compliance with aviation technical instructions only
  4. Compliance with fisheries licensing rules only

Explanation

Because the TDG Regulations incorporate the IMDG Code, a Canadian shipper of packaged marine pollutants must meet the Code's marking, labelling, and documentation requirements. These requirements give practical effect to the MARPOL Annex III obligation.

Question 13IMDG Code structure, scope, and legal framework (SOLAS Chapter VII, MARPOL Annex III, Canadian TDG Act and Regulations)

Which statement about the scope of SOLAS Chapter VII is most accurate?

  1. It applies only to oil tankers
  2. It applies only within territorial seas
  3. It applies only to passenger ships
  4. It covers the carriage of dangerous goods in packaged form and also addresses other cargo-related hazards such as solid bulk cargoes and INF cargo Correct answer.

Explanation

SOLAS Chapter VII contains parts dealing with packaged dangerous goods, solid bulk cargoes, and INF cargo, reflecting a broad scope for cargo-related hazards. It is not confined to a single ship type or to territorial waters.

Question 14IMDG Code structure, scope, and legal framework (SOLAS Chapter VII, MARPOL Annex III, Canadian TDG Act and Regulations)

What is the primary purpose of the IMDG Code's training requirement for shore-side personnel?

  1. To ensure personnel understand the hazards, classification, and documentation duties relevant to their functions Correct answer.
  2. To replace the need for proper packaging
  3. To certify personnel as ship's officers
  4. To authorize personnel to inspect vessels on behalf of the flag state

Explanation

The Code requires training commensurate with the person's responsibilities so that classification, packing, marking, labelling, and documentation are done correctly. It does not confer marine officer certification or flag state inspection authority.

Question 15IMDG Code structure, scope, and legal framework (SOLAS Chapter VII, MARPOL Annex III, Canadian TDG Act and Regulations)

Under the TDG Regulations, which action is generally required when a person imports dangerous goods into Canada for marine transport?

  1. The importer may rely solely on the foreign shipper's documents without verification
  2. The importer must reclassify all goods using Canadian-only criteria regardless of international codes
  3. The importer must ensure the goods are classified, documented, and packaged in accordance with the Regulations before they are offered for transport Correct answer.
  4. The importer is exempt because the goods originated outside Canada

Explanation

Importers have duties to ensure dangerous goods meet Canadian requirements, which incorporate international codes such as the IMDG Code for marine transport. Reliance on foreign documents without verifying compliance does not discharge those duties.

Question 16IMDG Code structure, scope, and legal framework (SOLAS Chapter VII, MARPOL Annex III, Canadian TDG Act and Regulations)

Which statement best explains why the IMDG Code is described as a dynamic document?

  1. It is periodically amended to keep pace with technical and regulatory developments, with amendments brought into force through SOLAS Correct answer.
  2. It is fixed permanently and never changes
  3. It is rewritten independently by each port state
  4. It applies only to newly built ships

Explanation

The Code is amended on a regular cycle by the IMO to reflect new hazards, technologies, and harmonization with other modal rules. Amendments enter into force through the SOLAS framework and are then implemented nationally.

Question 17IMDG Code structure, scope, and legal framework (SOLAS Chapter VII, MARPOL Annex III, Canadian TDG Act and Regulations)

A vessel operator discovers that a packaged marine pollutant has been loaded without the required marine pollutant mark. Which response best reflects the legal framework?

  1. Ignore it because marine pollutant marks are advisory only
  2. Rely on the bill of lading description as a substitute for the mark
  3. Defer correction until the next scheduled dry-docking
  4. Treat it as a compliance deficiency under the IMDG Code and TDG requirements and correct the marking before the goods proceed Correct answer.

Explanation

Marine pollutant marking is a mandatory requirement implementing MARPOL Annex III through the IMDG Code, and in Canada through the TDG Regulations. A missing mark is a compliance deficiency that should be corrected before the goods continue in transport.

Question 18IMDG Code structure, scope, and legal framework (SOLAS Chapter VII, MARPOL Annex III, Canadian TDG Act and Regulations)

Which statement best captures the hierarchy between the TDG Act, the TDG Regulations, and the IMDG Code in Canada?

  1. The Act and the Code are unrelated instruments with no interaction
  2. The Act provides authority, the Regulations set detailed requirements, and the Code is incorporated by reference to supply technical provisions Correct answer.
  3. The Regulations override the Act where they conflict
  4. The Code overrides the Act where they conflict

Explanation

The Act establishes the statutory authority, the Regulations prescribe detailed obligations, and international codes such as the IMDG Code are incorporated by reference to provide technical content. Incorporated documents operate within the authority of the statute and regulations rather than above them.

Question 19IMDG Code structure, scope, and legal framework (SOLAS Chapter VII, MARPOL Annex III, Canadian TDG Act and Regulations)

Which situation most clearly falls within the scope of MARPOL Annex III rather than Annex II?

  1. Oil carried as cargo in bulk
  2. Noxious liquid substances carried in bulk tanks
  3. Sewage discharged from a vessel
  4. Harmful substances carried in packaged form, such as drums or intermediate bulk containers Correct answer.

Explanation

Annex III governs harmful substances in packaged form, which is the regime the IMDG Code supports for marine pollutants. Annex II deals with noxious liquid substances carried in bulk, a distinct carriage method.

Question 20IMDG Code structure, scope, and legal framework (SOLAS Chapter VII, MARPOL Annex III, Canadian TDG Act and Regulations)

A shipper argues that because a substance is not listed by name in the IMDG Code's Dangerous Goods List, no requirements apply. Which response is most accurate?

  1. Only substances listed by name can ever be dangerous goods
  2. The Code contains provisions for assigning hazards to substances not specifically listed, so classification may still be required Correct answer.
  3. Unlisted substances are automatically exempt in all cases
  4. Classification is optional for all substances not listed by name

Explanation

The Code includes classification criteria and provisions for goods not specifically listed, so absence from the Dangerous Goods List does not by itself create an exemption. The shipper must apply the classification rules to determine whether and how the substance is regulated.

Question 21Classification of dangerous goods: hazard classes, divisions, packing groups, and subsidiary risks

Under the IMDG Code, which hazard class covers flammable liquids?

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

Explanation

Class 3 of the IMDG Code is assigned to flammable liquids, meaning liquids with a flash point of not more than 60 degrees Celsius in a closed-cup test, or any liquid offered for transport at temperatures at or above its flash point. Class 3 liquids are further allocated to packing groups based on flash point and boiling point.

Question 22Classification of dangerous goods: hazard classes, divisions, packing groups, and subsidiary risks

Which packing group is assigned to substances presenting low danger?

  1. Packing Group II
  2. Packing Group III Correct answer.
  3. Packing Group I
  4. Packing Group X

Explanation

Packing groups express the degree of danger within a class: Packing Group I represents great danger, Packing Group II represents medium danger, and Packing Group III represents low danger. Packing Group III therefore carries the least stringent packaging requirements.

Question 23Classification of dangerous goods: hazard classes, divisions, packing groups, and subsidiary risks

A substance that is not permitted for transport under any circumstances is assigned to which entry?

  1. A generic N.O.S. entry
  2. The forbidden goods list Correct answer.
  3. A limited quantity entry
  4. A class-specific residual entry

Explanation

The Dangerous Goods List includes entries for goods forbidden for transport, and such substances must not be offered for carriage. A generic or residual entry may be used only where the substance meets the definition of that entry. Forbidden goods cannot be regularised by choosing another entry.

Question 24Classification of dangerous goods: hazard classes, divisions, packing groups, and subsidiary risks

In the IMDG Code, what does a division number such as 4.1 indicate?

  1. The packing group of the substance
  2. The transport category for stowage
  3. The flash point band of the substance
  4. A subdivision within a hazard class Correct answer.

Explanation

Hazard classes may be subdivided into divisions, and the decimal suffix identifies the division within the class, for example flammable solids are Division 4.1. Divisions group substances with similar hazard characteristics within the parent class.

Question 25Classification of dangerous goods: hazard classes, divisions, packing groups, and subsidiary risks

Which class includes substances that, in contact with water, emit flammable gases?

  1. Class 4.2
  2. Class 5.1
  3. Class 6.1
  4. Class 4.3 Correct answer.

Explanation

Division 4.3 covers substances which, in contact with water, are liable to become spontaneously flammable or to give off flammable gases in dangerous quantities. This is distinct from Division 4.2, which covers substances liable to spontaneous combustion.

Question 26Classification of dangerous goods: hazard classes, divisions, packing groups, and subsidiary risks

What is the primary hazard of a substance assigned to Class 8?

  1. Toxicity on inhalation
  2. Corrosivity Correct answer.
  3. Radioactivity
  4. Infectiousness

Explanation

Class 8 comprises corrosive substances, which by chemical action cause severe damage when in contact with living tissue or, in the case of leakage, materially damage or destroy other goods or the means of transport. Corrosivity is the defining property of the class.

Question 27Classification of dangerous goods: hazard classes, divisions, packing groups, and subsidiary risks

A substance has a subsidiary risk shown in the Dangerous Goods List. What does this mean for classification?

  1. It replaces the primary class for documentation
  2. It applies only during warehousing
  3. It is optional information for the shipper
  4. It must be shown in addition to the primary class Correct answer.

Explanation

A subsidiary risk reflects an additional hazard of the substance beyond its primary class, and it must be identified alongside the primary class in the transport document and on the marking. It does not displace the primary class. The subsidiary risk also influences segregation and stowage requirements.

Question 28Classification of dangerous goods: hazard classes, divisions, packing groups, and subsidiary risks

Which class is assigned to oxidizing substances?

  1. Class 6.1
  2. Class 5.2
  3. Class 9
  4. Class 5.1 Correct answer.

Explanation

Division 5.1 covers oxidizing substances which, while not necessarily combustible themselves, may by yielding oxygen cause or contribute to the combustion of other material. Organic peroxides, which are thermally unstable, are placed in Division 5.2.

Question 29Classification of dangerous goods: hazard classes, divisions, packing groups, and subsidiary risks

A flammable liquid has a flash point of about 23 degrees Celsius and a boiling point above 35 degrees Celsius. Which packing group applies?

  1. No packing group applies
  2. Packing Group II Correct answer.
  3. Packing Group III
  4. Packing Group I

Explanation

For Class 3, Packing Group I applies where the initial boiling point is 35 degrees Celsius or less, Packing Group II where the flash point is below 23 degrees Celsius and the boiling point exceeds 35 degrees Celsius, and Packing Group III where the flash point is between 23 and 60 degrees Celsius. A flash point of about 23 degrees Celsius with a higher boiling point therefore falls in Packing Group II.

Question 30Classification of dangerous goods: hazard classes, divisions, packing groups, and subsidiary risks

A substance is listed by name in the Dangerous Goods List with a specific UN number. Which entry should the consignor use?

  1. The generic N.O.S. entry for the class
  2. Any entry in the same class
  3. The specific named entry Correct answer.
  4. The entry with the lowest packing group

Explanation

Where a substance is specifically named in the Dangerous Goods List, that named entry must be used rather than a generic or residual entry. The proper shipping name, UN number, class and packing group all follow from the named entry. Generic entries are reserved for substances not otherwise named.

Question 31Classification of dangerous goods: hazard classes, divisions, packing groups, and subsidiary risks

A liquid has a flash point of 55 degrees Celsius and does not sustain combustion. How is it classified under Class 3 criteria?

  1. Class 3, Packing Group III Correct answer.
  2. Class 4.1
  3. Class 3, Packing Group II
  4. Not subject to Class 3

Explanation

A liquid with a flash point above 23 degrees Celsius but not exceeding 60 degrees Celsius falls within Class 3 and is assigned to Packing Group III. The combustion test result affects whether the substance is excluded, but a liquid that does not sustain combustion still meets the flash point criterion for classification.

Question 32Classification of dangerous goods: hazard classes, divisions, packing groups, and subsidiary risks

A substance is toxic by inhalation and also corrosive. How is the primary class determined?

  1. By the higher numerical class number
  2. By the consignor's preference
  3. By the hazard that predominates in the precedence table Correct answer.
  4. By the packing group of the corrosive hazard

Explanation

Where a substance presents more than one hazard, the primary class is determined by the precedence of hazard table in the IMDG Code, which establishes which hazard takes priority. The remaining hazards are then shown as subsidiary risks. The table is applied systematically rather than by numerical order of classes.

Question 33Classification of dangerous goods: hazard classes, divisions, packing groups, and subsidiary risks

What distinguishes Division 6.2 from other divisions of Class 6?

  1. It covers toxic gases
  2. It covers corrosive liquids
  3. It covers radioactive material
  4. It covers infectious substances Correct answer.

Explanation

Division 6.2 is assigned to infectious substances, which are substances known or reasonably expected to contain pathogens capable of causing disease in humans or animals. Division 6.1 covers toxic substances, a separate hazard. The two divisions are treated distinctly in the Code.

Question 34Classification of dangerous goods: hazard classes, divisions, packing groups, and subsidiary risks

A substance meets the criteria for Division 4.2 because it is liable to spontaneous combustion. Which statement about its packing group is correct?

  1. All Division 4.2 substances are Packing Group I
  2. Packing group is determined by the shipper's judgement
  3. Packing groups do not apply to Division 4.2
  4. Packing groups are assigned according to the criteria in the class provisions Correct answer.

Explanation

Packing groups are assigned using the specific criteria set out in the class provisions for the relevant division, and Division 4.2 substances can fall into different packing groups depending on their behaviour. The assignment follows the prescribed test criteria rather than a blanket rule.

Question 35Classification of dangerous goods: hazard classes, divisions, packing groups, and subsidiary risks

Which of these best describes a Class 9 substance?

  1. A substance that is toxic only when heated
  2. A substance presenting a hazard not covered by other classes Correct answer.
  3. A substance that is corrosive only in solution
  4. A substance that is always non-hazardous

Explanation

Class 9 covers miscellaneous dangerous substances and articles that present a danger during transport but do not meet the criteria of any other class. It captures hazards such as environmentally hazardous substances and elevated temperature materials. It does not mean the goods are harmless.

Question 36Classification of dangerous goods: hazard classes, divisions, packing groups, and subsidiary risks

A consignment contains a substance with a Class 3 primary hazard and a Class 6.1 subsidiary risk. What must the transport document reflect?

  1. Both the Class 3 designation and the subsidiary risk Correct answer.
  2. Only the subsidiary risk
  3. Only the Class 3 designation
  4. Neither, if the quantity is small

Explanation

The transport document must show the primary class and, where applicable, the subsidiary risk, so that carriers and emergency responders are aware of the additional hazard. Omitting the subsidiary risk misrepresents the hazard profile of the goods. The requirement applies regardless of the quantity unless a specific exemption applies.

Question 37Classification of dangerous goods: hazard classes, divisions, packing groups, and subsidiary risks

Which statement correctly describes the relationship between a hazard class and a packing group?

  1. Packing groups apply only to Class 1
  2. Packing groups replace the class designation
  3. Each class has exactly one packing group
  4. Packing groups rank danger within classes that use them Correct answer.

Explanation

Packing groups are a ranking of the degree of danger of substances within classes for which the Code provides packing group criteria. Not every class uses packing groups, and where used they supplement rather than replace the class. They never substitute for the hazard class itself.

Question 38Classification of dangerous goods: hazard classes, divisions, packing groups, and subsidiary risks

A substance is listed in the Dangerous Goods List with the entry 'UN 1993, FLAMMABLE LIQUID, N.O.S.'. What does the N.O.S. designation indicate?

  1. The substance is exempt from packing requirements
  2. The substance is not specifically named elsewhere in the list Correct answer.
  3. The substance has no hazardous properties
  4. The substance is forbidden for sea transport

Explanation

N.O.S. stands for 'not otherwise specified' and is used for generic entries covering substances that meet the class criteria but are not individually named in the Dangerous Goods List. When using such an entry, the consignor must also provide the technical name of the substance. The entry remains fully subject to the Code.

Question 39Classification of dangerous goods: hazard classes, divisions, packing groups, and subsidiary risks

Which division within Class 4 covers substances liable to spontaneous combustion?

  1. Division 4.1
  2. Division 4.4
  3. Division 4.2 Correct answer.
  4. Division 4.3

Explanation

Division 4.2 covers pyrophoric substances and self-heating substances liable to spontaneous combustion. Division 4.1 covers flammable solids and Division 4.3 covers water-reactive substances. There is no Division 4.4.

Question 40Classification of dangerous goods: hazard classes, divisions, packing groups, and subsidiary risks

A substance's hazard data show it is an organic peroxide. Which division applies, and what is the key classification concern?

  1. Division 3, with flash point criteria
  2. Division 4.1, with self-reactive criteria
  3. Division 5.2, with temperature control considerations Correct answer.
  4. Division 5.1, with oxidizer test criteria

Explanation

Organic peroxides are assigned to Division 5.2 because they are thermally unstable and may undergo exothermic self-accelerating decomposition. Classification involves assessing the substance against the division's criteria and may require temperature control during transport. The organic peroxide listing in the Code provides the applicable controls.

Question 41Classification of dangerous goods: hazard classes, divisions, packing groups, and subsidiary risks

Two hazards are present and the precedence table places the toxic hazard above the corrosive hazard. How should the goods be classified?

  1. Primary class 8 with Class 6.1 as a subsidiary risk
  2. Both classes shown as co-primary
  3. Primary class 6.1 with Class 8 as a subsidiary risk Correct answer.
  4. Primary class 6.1 with no subsidiary risk

Explanation

The precedence table determines which hazard becomes the primary class; where toxicity takes precedence over corrosivity, the goods are classified in Division 6.1. The corrosive hazard is then recorded as a subsidiary risk. The Code does not permit dual primary classes for a single substance.

Question 42Classification of dangerous goods: hazard classes, divisions, packing groups, and subsidiary risks

A consignor cannot find a specific entry for a new corrosive mixture. What is the correct approach?

  1. Assign Class 9 because no specific entry exists
  2. Assign the class of the largest component by mass
  3. Declare the goods as non-hazardous pending testing
  4. Assign Class 8 and select the appropriate generic N.O.S. entry with the technical name Correct answer.

Explanation

Where no specific entry exists, the substance is classified according to the class criteria, here Class 8, and assigned to the appropriate generic N.O.S. entry, with the technical name added. The packing group must also be determined from the corrosivity criteria. Classification is based on hazard properties, not on the composition by mass alone.

Question 43Classification of dangerous goods: hazard classes, divisions, packing groups, and subsidiary risks

A substance is a flammable solid that also meets the criteria for a corrosive subsidiary risk. Which factor most directly determines how the primary class is chosen?

  1. The precedence of hazard table applied to the identified hazards Correct answer.
  2. The packing group of the corrosive hazard alone
  3. The physical state of the substance at 20 degrees Celsius
  4. The intended duration of the sea voyage

Explanation

When more than one hazard is identified, the primary class is selected by applying the precedence of hazard table to those hazards. The remaining hazard is then shown as a subsidiary risk. Physical state and voyage duration may affect other requirements but do not decide the class precedence.

Question 44Classification of dangerous goods: hazard classes, divisions, packing groups, and subsidiary risks

Which statement about the assignment of subsidiary risks is most accurate?

  1. Subsidiary risks apply only to Class 1 explosives
  2. Subsidiary risks are assigned only when the consignor requests them
  3. Subsidiary risks are identified whenever the substance meets the criteria for another class or division Correct answer.
  4. Subsidiary risks are limited to one per substance

Explanation

A subsidiary risk is identified whenever a substance meets the criteria for a hazard in addition to its primary class, and it is then shown in the transport documentation and marking. More than one subsidiary risk can apply in some cases. The requirement is not limited to any single class.

Question 45Classification of dangerous goods: hazard classes, divisions, packing groups, and subsidiary risks

A liquid has a flash point of 60 degrees Celsius measured in a closed cup and an initial boiling point of 100 degrees Celsius. How should it be treated under Class 3 criteria?

  1. Class 3, Packing Group I
  2. Class 3, Packing Group III Correct answer.
  3. Outside Class 3 unless offered above its flash point
  4. Class 3, Packing Group II

Explanation

Class 3 covers liquids with a flash point of not more than 60 degrees Celsius, so a closed-cup flash point of exactly 60 degrees Celsius is within the class. With a flash point above 23 degrees Celsius and a boiling point above 35 degrees Celsius, the liquid falls in Packing Group III. Liquids transported at or above their flash point are also covered.

Question 46Classification of dangerous goods: hazard classes, divisions, packing groups, and subsidiary risks

Under the IMDG Code, a substance that is transported in a packaging meeting Packing Group I requirements indicates which level of danger?

  1. Great danger Correct answer.
  2. Medium danger
  3. Minor danger
  4. No significant danger

Explanation

The three packing groups reflect degree of danger for packing purposes. Packing Group I is assigned to substances presenting great danger, Packing Group II to medium danger, and Packing Group III to minor danger. The assignment depends on the hazard criteria of the class, not on the size of the consignment.

Question 47Classification of dangerous goods: hazard classes, divisions, packing groups, and subsidiary risks

Which class in the IMDG Code covers substances that, in contact with water, emit flammable gases?

  1. Class 8
  2. Class 4.1
  3. Class 4.3 Correct answer.
  4. Class 4.2

Explanation

Class 4 is divided into three divisions: 4.1 for flammable solids, 4.2 for substances liable to spontaneous combustion, and 4.3 for substances which, in contact with water, emit flammable gases. The water-reactive behaviour is the defining criterion for Division 4.3.

Question 48Classification of dangerous goods: hazard classes, divisions, packing groups, and subsidiary risks

A substance has a primary hazard of Division 5.1 and also meets the criteria for Division 8. Which statement best describes how this dual hazard is handled in classification?

  1. The subsidiary risk is omitted because it is a lower-numbered class
  2. The primary class is 8 and Division 5.1 is assigned as a subsidiary risk
  3. Both hazards are recorded as primary classes of equal standing
  4. The primary class is 5.1 and Class 8 is assigned as a subsidiary risk Correct answer.

Explanation

Where a substance meets the criteria of more than one hazard class, the class giving the most stringent packing group and precedence determines the primary class, and the other hazards are shown as subsidiary risks. The subsidiary risk must still be reflected in the transport document and labelling. It is never dropped merely because of class numbering.

Question 49Classification of dangerous goods: hazard classes, divisions, packing groups, and subsidiary risks

Which statement correctly describes Division 6.2 of the IMDG Code?

  1. It covers infectious substances, including biological products and medical waste Correct answer.
  2. It covers toxic substances that are harmful if swallowed
  3. It covers radioactive material with a subsidiary infectious risk
  4. It covers genetically modified micro-organisms only when they are non-pathogenic

Explanation

Division 6.2 is assigned to infectious substances, which are those known or reasonably expected to contain pathogens capable of causing disease in humans or animals. It also covers related categories such as biological products, cultures, and medical or clinical waste. Toxic substances of a chemical nature belong to Division 6.1.

Question 50Classification of dangerous goods: hazard classes, divisions, packing groups, and subsidiary risks

A substance is a self-reactive substance of Division 4.1 that requires temperature control to prevent dangerous decomposition during transport. How should it be classified and controlled?

  1. As a Class 1 explosive because self-reactive substances are always treated as explosives
  2. As a Division 5.2 organic peroxide because temperature control is required
  3. As a Class 9 substance because the hazard is only a transport management concern
  4. As a Division 4.1 self-reactive substance requiring temperature control under the applicable packing instruction Correct answer.

Explanation

Self-reactive substances are assigned to Division 4.1 unless they are organic peroxides or explosives. Some self-reactive substances are subject to temperature control, which is imposed through specific packing instructions and control temperature requirements. The temperature control does not change the class or division assigned.