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Free CDGP Practice Questions

10 free, exam-style CDGP (CDGP) practice questions with answers and explanations. No signup required. Work through them below, then take the full free CDGP practice test to study every exam domain.

Question 1

A fiberboard box bears the UN specification mark: 4G/Y145/S/22/USA/M4721. Based solely on this mark, which statement is CORRECT?

  1. The mark 'S' means the box has been tested for single (non-combination) use only
  2. The number 145 represents the maximum internal volume in litres, not the gross mass
  3. The box may be used for Packing Group I, II, or III materials because 'Y' indicates universal approval
  4. The box is approved for solids or inner packagings with a maximum gross mass of 145 kg, suitable for Packing Group II and III materials only
Show answer & explanation

Correct answer: D - The box is approved for solids or inner packagings with a maximum gross mass of 145 kg, suitable for Packing Group II and III materials only

Question 2

A shipper in the United States offers a Class 3 flammable liquid for highway transport. The shipping paper lists a 1-800 number that routes to voicemail after business hours, with a message promising a callback within two hours. Under 49 CFR 172.604, this arrangement is:

  1. Acceptable because toll-free 1-800 numbers are explicitly approved by PHMSA for emergency response use
  2. Acceptable, provided the callback occurs within the two-hour window specified in 49 CFR 172.604
  3. Not acceptable because the number must be monitored at all times the material is in transportation, with no provision for callbacks
  4. Not acceptable only when the shipment crosses a state line, making it subject to federal interstate requirements
Show answer & explanation

Correct answer: C - Not acceptable because the number must be monitored at all times the material is in transportation, with no provision for callbacks

Question 3

A shipper wants to send standalone lithium ion battery packs (UN 3480) by air cargo. A colleague suggests preparing them under 'Section II of PI 965' to avoid a full Shipper's Declaration. Which response is MOST accurate?

  1. Section II of PI 965 was removed effective April 1, 2022; UN 3480 must now be prepared under Section IA or IB, both requiring a Shipper's Declaration
  2. Section II of PI 965 applies only to lithium metal batteries (UN 3090), not to lithium ion batteries (UN 3480)
  3. Section II of PI 965 is available for UN 3480 cells with a Watt-hour rating not exceeding 20 Wh per cell
  4. Section II of PI 965 remains available but is restricted to cargo-aircraft-only (CAO) shipments
Show answer & explanation

Correct answer: A - Section II of PI 965 was removed effective April 1, 2022; UN 3480 must now be prepared under Section IA or IB, both requiring a Shipper's Declaration

Question 4

A carrier's acceptance agent tells a shipper: 'Preparing your shipment to the IATA DGR is a legal requirement under international treaty.' Which statement BEST describes the legal relationship between the IATA DGR and the ICAO Technical Instructions?

  1. Both documents are legally binding simultaneously; shippers must independently verify compliance with each instrument before every air shipment
  2. The IATA DGR supersedes the ICAO Technical Instructions whenever a state or operator variation in the DGR conflicts with an ICAO standard provision
  3. The ICAO Technical Instructions carry legal force under Annex 18; the IATA DGR is an industry field manual consolidating ICAO TI and operator variations, not itself a treaty instrument
  4. The IATA DGR is the primary treaty instrument for air shipments; the ICAO Technical Instructions serve as non-binding reference guidelines for background use only
Show answer & explanation

Correct answer: C - The ICAO Technical Instructions carry legal force under Annex 18; the IATA DGR is an industry field manual consolidating ICAO TI and operator variations, not itself a treaty instrument

Question 5

The IMDG Code Dangerous Goods List assigns Stowage Category B to a Class 6.1 toxic liquid. The substance is being loaded onto a passenger ship carrying 50 passengers. What does Stowage Category B require in this situation?

  1. The substance may be stowed under deck, provided it is segregated from foodstuffs by at least one structural bulkhead
  2. The substance is prohibited from carriage on any passenger vessel, regardless of quantity
  3. On a passenger ship where the number of passengers exceeds the limiting number, the substance must be stowed on deck only
  4. The substance must be stowed on deck on all vessels, both cargo and passenger, regardless of passenger count
Show answer & explanation

Correct answer: C - On a passenger ship where the number of passengers exceeds the limiting number, the substance must be stowed on deck only

Question 6

A road tanker carrying a substance highlighted green in the ERG yellow index has overturned and is leaking. Wind is blowing from west to east. According to ERG Table 1 (Initial Isolation and Protective Action Distances), in which direction should persons be directed to move during initial isolation?

  1. Directly upwind (toward the west) to remain out of the toxic gas cloud and downwind plume
  2. In any direction, as long as persons reach at least 500 metres from the tanker before stopping
  3. Directly downwind (toward the east), moving away from the liquid source of the release
  4. In a crosswind direction (north or south) away from the spill, to the isolation distance listed in Table 1
Show answer & explanation

Correct answer: D - In a crosswind direction (north or south) away from the spill, to the isolation distance listed in Table 1

Question 7

A shipper prepares a Class 3 PG III Limited Quantity (LQ) consignment under the IMDG Code, correctly marking each outer package with the IMDG black-diamond LQ mark. The shipment is now re-tendered for air transport. What must the shipper address before offering it for carriage by air?

  1. Nothing - the IMDG black-diamond mark satisfies IATA LQ requirements because both derive from the UN Model Regulations
  2. Attach a Cargo Aircraft Only label, since all Class 3 LQ shipments by air are restricted to cargo aircraft
  3. No LQ provision exists under IATA; the shipment must revert to fully regulated status for the air leg
  4. Replace the IMDG black-diamond mark with the IATA 'Y' mark and verify inner-packaging quantities meet IATA LQ limits, which may be more restrictive
Show answer & explanation

Correct answer: D - Replace the IMDG black-diamond mark with the IATA 'Y' mark and verify inner-packaging quantities meet IATA LQ limits, which may be more restrictive

Question 8

A chemical distributor ships by highway. Under 49 CFR 172.800, which of the following shipments REQUIRES a written Transportation Security Plan?

  1. A 2,500-litre cargo tank of Division 2.2 non-flammable, non-toxic compressed gas with no subsidiary hazard
  2. Any quantity of a material that is poisonous by inhalation (Toxic Inhalation Hazard - TIH/PIH)
  3. A placarded quantity of Class 3 flammable liquid (PG II) in a 1,000-litre IBC
  4. A 3,500-litre portable tank of Class 8 corrosive liquid meeting Packing Group III criteria
Show answer & explanation

Correct answer: B - Any quantity of a material that is poisonous by inhalation (Toxic Inhalation Hazard - TIH/PIH)

Question 9

A shipper completes an IATA Shipper's Declaration that includes: UN number, Proper Shipping Name with technical name, Class, Packing Group, and net quantity per package. The airline's acceptance agent returns the form as incomplete. Which entry required by IATA DGR Section 8.1.6.9 is MOST likely missing?

  1. The country of origin of the hazardous material
  2. The flash point of the substance in degrees Celsius
  3. The shipper's tax identification number for customs
  4. The applicable IATA Packing Instruction number
Show answer & explanation

Correct answer: D - The applicable IATA Packing Instruction number

Question 10

An organic peroxide (Division 5.2) has a Control Temperature of +15°C and an Emergency Temperature of +20°C per the IMDG Code. During a voyage, a reefer unit malfunctions and the container reaches +18°C. What is the CORRECT interpretation?

  1. The Emergency Temperature governs all corrective responses; since +18°C is still below +20°C, the substance remains within approved carriage conditions and no regulatory action is required at this time
  2. Both temperature thresholds have been breached simultaneously, triggering immediate emergency procedures including diverting to the nearest port
  3. The Control Temperature has been exceeded, requiring immediate corrective action to restore temperature; formal emergency procedures are not yet triggered because the Emergency Temperature has not been reached
  4. An operational tolerance band exists between the two temperatures; a reading of +18°C falls within normal variation and does not constitute a regulatory breach under IMDG
Show answer & explanation

Correct answer: C - The Control Temperature has been exceeded, requiring immediate corrective action to restore temperature; formal emergency procedures are not yet triggered because the Emergency Temperature has not been reached

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