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China dangerous-goods road transport foundations study materials
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China dangerous-goods road transport foundations practice questions

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Question 1Hazard Properties

According to the Classification and Code of Dangerous Goods (GB 6944-2012) and the List of Dangerous Goods (GB 12268-2012), into how many hazard classes are dangerous goods divided for road transportation?

  1. 9 primary hazard classes Correct answer.
  2. 7 primary hazard classes
  3. 12 primary hazard classes
  4. 5 primary hazard classes

Explanation

Under GB 6944-2012 and GB 12268-2012, dangerous goods are categorized into 9 primary hazard classes based on their intrinsic physical, chemical, and physiological hazards. These classes range from Class 1 (Explosives) to Class 9 (Miscellaneous Dangerous Substances and Articles), aligning with the United Nations Model Regulations on the Transport of Dangerous Goods.

Question 2Hazard Properties

Under GB 6944-2012, which of the following explosive divisions comprises substances and articles that present a mass explosion hazard (整体爆炸危险) affecting virtually the entire load instantaneously?

  1. Division 1.1 Correct answer.
  2. Division 1.2
  3. Division 1.3
  4. Division 1.4

Explanation

Division 1.1 consists of substances and articles which have a mass explosion hazard (整体爆炸危险), meaning the entire quantity detonates almost instantaneously upon initiation (such as TNT or dynamite). Division 1.2 presents projection hazards without mass explosion, Division 1.3 presents fire hazards and minor blast/projection hazards, and Division 1.4 presents no significant blast hazard.

Question 3Hazard Properties

Which of the following gases is classified under Division 2.1 Flammable Gases (易燃气体) under GB 6944-2012 and JT/T 617.2?

  1. Liquefied Petroleum Gas (液化石油气, UN 1075) Correct answer.
  2. Compressed Nitrogen (压缩氮气, UN 1066)
  3. Liquid Chlorine (液氯, UN 1017)
  4. Carbon Dioxide (二氧化碳, UN 1013)

Explanation

Under GB 6944-2012, Division 2.1 covers flammable gases that are ignitable when in a mixture of 13% or less by volume with air, or have a flammable range with air of at least 12 percentage points regardless of lower limit. Liquefied Petroleum Gas (LPG, UN 1075) and Hydrogen (UN 1049) are typical Division 2.1 flammable gases.

Question 4Hazard Properties

When transporting refrigerated liquefied cryogenic gases classified under Division 2.2 (such as Liquid Nitrogen UN 1977 or Liquid Argon UN 1951), what is the primary occupational health and safety hazard in an enclosed compartment or low-lying space?

  1. Rapid asphyxiation (窒息) resulting from oxygen displacement as the cryogenic liquid vaporizes and expands hundreds of times in volume Correct answer.
  2. Violent chemical polymerization releasing flammable hydrocarbon vapors
  3. Spontaneous detonation caused by mechanical road vibration
  4. Immediate bioaccumulation and systemic carcinogenicity upon skin contact

Explanation

Cryogenic liquids under Division 2.2 (Non-flammable, non-toxic gases) vaporize rapidly into enormous gas volumes (e.g. 1 liter of liquid nitrogen expands to ~700 liters of gas at ambient conditions). In enclosed cabs, cargo compartments, or low-lying road swales, this rapid expansion drastically reduces atmospheric oxygen concentration below 19.5%, leading to sudden asphyxiation and severe cold-contact frostbite.

Question 5Hazard Properties

Which of the following substances is classified under Division 4.1 Flammable Solids (易燃固体) under GB 6944-2012?

  1. Red Phosphorus (红磷, UN 1338) Correct answer.
  2. White Phosphorus (白磷, UN 1381)
  3. Metallic Sodium (金属钠, UN 1428)
  4. Potassium Permanganate (高锰酸钾, UN 1490)

Explanation

Under GB 6944-2012, Division 4.1 includes readily combustible solids that can easily ignite through brief contact with an ignition source and burn rapidly (e.g. Red Phosphorus UN 1338, Sulfur UN 1350). In contrast, White Phosphorus is a Division 4.2 spontaneously combustible substance, Metallic Sodium is a Division 4.3 water-reactive metal, and Potassium Permanganate is a Division 5.1 oxidizer.

Question 6Hazard Properties

What is the key distinguishing hazard property of Division 4.2 Substances Liable to Spontaneous Combustion (易于自燃的物质) compared to Division 4.1 solids?

  1. They can ignite spontaneously without an external spark or flame through reaction with oxygen in air (pyrophoric) or through self-heating Correct answer.
  2. They only ignite when exposed to direct open electrical arcing exceeding 1,000 volts
  3. They dissolve non-metallic packaging materials within 5 minutes of contact
  4. They emit lethal radioactive particles when compressed under mechanical weight

Explanation

Division 4.2 substances comprise pyrophoric substances (which ignite within 5 minutes of coming into contact with air even in small quantities, such as White Phosphorus UN 1381 or diethylzinc) and self-heating substances (which, in large quantities and over longer periods, heat up and ignite through oxidation, such as activated carbon or oil-soaked rags).

Question 7Hazard Properties

Calcium Carbide (碳化钙/电石, UN 1402) is classified under Division 4.3 because when it comes into contact with water or atmospheric moisture, it undergoes a chemical reaction that releases which dangerous flammable gas?

  1. Acetylene (乙炔) Correct answer.
  2. Carbon Monoxide (一氧化碳)
  3. Chlorine Gas (氯气)
  4. Sulfur Dioxide (二氧化硫)

Explanation

Under GB 6944-2012 and JT/T 617.2, Calcium Carbide (UN 1402) is a Division 4.3 water-reactive substance (遇水放出易燃气体的物质). Upon contact with water, it produces acetylene gas (CaC₂ + 2H₂O → Ca(OH)₂ + C₂H₂↑) with substantial heat release, creating a severe explosive atmospheric hazard.

Question 8Hazard Properties

What is the primary dangerous property of Division 5.1 Oxidizing Substances (氧化性物质, e.g. Hydrogen Peroxide UN 2014, Ammonium Nitrate UN 1942)?

  1. Although not necessarily combustible themselves, they readily yield oxygen to initiate or intensify the burning of other combustible materials Correct answer.
  2. They generate strong alkaline vapors that turn surrounding water supplies acidic within seconds
  3. They absorb ambient oxygen rapidly to extinguish all open flames in a compartment
  4. They emit powerful penetrating gamma radiation that degrades nearby electrical wiring

Explanation

Under GB 6944-2012, Division 5.1 Oxidizing Substances are substances which, while in themselves not necessarily combustible, may, generally by yielding oxygen, cause or contribute to the combustion of other material. Mixing oxidizers with organic matter, fuels, or reducing agents can result in catastrophic fires and violent explosions.

Question 9Hazard Properties

For Class 5.2 Organic Peroxides (有机过氧化物), what does the critical parameter SADT (Self-Accelerating Decomposition Temperature / 自加速分解温度) represent?

  1. The lowest ambient temperature at which self-accelerating decomposition may occur in a substance in the packaging as used in transport Correct answer.
  2. The temperature at which the liquid boils and converts into a non-hazardous solid phase
  3. The highest temperature at which the product can be safely frozen without cracking the steel container
  4. The flash point of the solvent used to dilute the organic peroxide

Explanation

Under JT/T 617.2 and GB 6944-2012, SADT is defined as the lowest temperature at which self-accelerating decomposition may occur in a substance in the packaging as used during transport. If the cargo temperature approaches or exceeds the SADT, runaway exothermic thermal decomposition can occur, triggering violent deflagration or explosion, which requires strict temperature control (Control Temperature and Emergency Temperature).

Question 10Hazard Properties

Under Division 6.2 Infectious Substances (感染性物质), how are Category A infectious substances (UN 2814 and UN 2900) distinguished from Category B biological substances (UN 3373)?

  1. Category A substances are capable of causing permanent disability, life-threatening or fatal disease in otherwise healthy humans or animals when exposure occurs Correct answer.
  2. Category A substances consist only of non-pathogenic food additives transported in sterile insulated vans
  3. Category B substances have a mandatory flash point below 23°C and require explosive placards
  4. Category A substances cannot be transported by road vehicles under any circumstance in China

Explanation

Under GB 6944-2012 and JT/T 617.2, Category A infectious substances are transported in a form that, when exposure occurs, is capable of causing permanent disability, life-threatening, or fatal disease in otherwise healthy humans (UN 2814) or animals (UN 2900). Category B (UN 3373) includes clinical specimens and diagnostic samples that do not meet the criteria for Category A.

Question 11Hazard Properties

Why is it strictly forbidden under JT/T 617.6 to load Class 8 acidic corrosives (e.g. Sulfuric Acid UN 1830) together in the same vehicle compartment with Class 8 alkaline corrosives (e.g. Sodium Hydroxide solution UN 1824)?

  1. Acid-base contact triggers violent exothermic neutralization reactions, potentially causing explosive boiling, vessel rupture, and corrosive splattering Correct answer.
  2. Alkaline substances permanently absorb all acid odors, making leak detection impossible
  3. The combination forms inert table salt that loses all industrial commercial value during transit
  4. The mixed vapors create high-frequency ultrasonic waves that interfere with vehicle ABS sensors

Explanation

Under JT/T 617.6 (Segregation and loading rules), strong acids and strong alkalis must be strictly segregated. If accidental leakage causes acid and base to mix, the resulting violent exothermic acid-base neutralization releases extreme heat that can shatter packaging containers, vaporize corrosive aerosols, ignite surrounding cargo, and cause severe vehicle structural damage.

Question 12Hazard Properties

Lithium-ion batteries transported separately as cargo are classified under Class 9 Miscellaneous Dangerous Substances under which UN Number in GB 12268-2012 and JT/T 617.2?

  1. UN 3480 (Lithium ion batteries) Correct answer.
  2. UN 1203 (Motor spirit)
  3. UN 1075 (Liquefied petroleum gas)
  4. UN 3082 (Environmentally hazardous substance, liquid)

Explanation

Under GB 12268-2012 and JT/T 617.2, lithium-ion batteries (including lithium polymer batteries) transported by themselves are classified as UN 3480, Class 9. Lithium metal batteries are UN 3090. When contained in equipment or packed with equipment, they are UN 3481 or UN 3091, respectively.

Question 13Hazard Properties

What is the primary characteristic of substances designated as Environmentally Hazardous Substances (环境有害物质 / Marine Pollutants) assigned to UN 3077 (Solid) and UN 3082 (Liquid)?

  1. They pose acute or long-term aquatic toxicity (water pollution) causing severe harm to fish, daphnia, or algae ecosystems if spilled Correct answer.
  2. They corrode vehicle tires instantly upon contact within 3 seconds
  3. They explode violently whenever exposed to direct sunlight above 25°C
  4. They release radioactive radon gas during normal road driving

Explanation

Under GB 6944-2012 and JT/T 617.2, UN 3077 and UN 3082 cover environmentally hazardous substances (aquatic environment pollutants) that do not meet the criteria of Classes 1 to 8, but possess acute or chronic aquatic toxicity (LC50/EC50 ≤ 1 mg/L or non-rapidly degradable) threatening water systems.

Question 14Hazard Properties

What is the relative vapor density of Liquefied Petroleum Gas (LPG, UN 1075) compared to ambient air, and what operational hazard does this create during a road transport leak?

  1. LPG vapor is heavier than air (density ratio ~1.5 to 2.0); it sinks, spreads along the ground, and accumulates in low-lying trenches, drains, and ditches to form explosive clouds Correct answer.
  2. LPG vapor is lighter than air (density ratio ~0.5); it rises vertically at high speed and dissipates harmlessly in the upper troposphere
  3. LPG vapor has the exact same density as air and immediately turns into an odorless liquid at any temperature
  4. LPG vapor is non-reactive and settles permanently as harmless crystalline snowflakes on asphalt

Explanation

LPG (primarily propane and butane) has a vapor density approximately 1.5 to 2.0 times that of air. When released during a transport incident, the cold vapor does not rise; instead, it hugs the ground, flows into depressions, culverts, and roadside drainage ditches, where it can travel long distances to an ignition source and flash back explosively.

Question 15Hazard Properties

Compressed Natural Gas (CNG / Methane, UN 1971) behaves differently from LPG during an accidental atmospheric release primarily because:

  1. Methane has a vapor density of approximately 0.55 relative to air, making it lighter than air, so it disperses rapidly upwards into the atmosphere in open environments Correct answer.
  2. Methane is non-combustible and cannot be ignited even in pure oxygen
  3. Methane instantly freezes into solid dry ice blocks upon contact with oxygen
  4. Methane emits intense red phosphorescence visible for 5 kilometers

Explanation

Methane (CNG, UN 1971) has a molecular weight of 16, resulting in a vapor density of ~0.55 compared to air (molecular weight ~29). Because it is significantly lighter than air, escaped CNG rises and disperses rapidly in open-air environments, though it remains a severe fire and explosion hazard if trapped in confined spaces (such as tunnels or underpasses).

Question 16Hazard Properties

Anhydrous Ammonia (液氨, UN 1005) is classified under Division 2.3 Toxic Gas. What dual secondary hazard properties make it particularly hazardous during road transport emergencies?

  1. It is both corrosive (causing severe alkaline chemical burns and eye/lung damage) and flammable within a specific concentration range (15% to 28% in air) Correct answer.
  2. It is a radioactive gamma-emitter and an explosive organic peroxide
  3. It decomposes into metallic mercury and nitric acid on contact with asphalt
  4. It has zero odor and cannot be detected until lethal lung edema occurs

Explanation

Under GB 6944-2012 and GB 12268-2012, Anhydrous Ammonia (UN 1005) is classified under Division 2.3 with subsidiary hazards of Class 8 (Corrosive, forming ammonium hydroxide with tissue moisture that causes severe liquefaction necrosis) and Division 2.1 (Flammable gas with an explosive limit between 15% and 28% in air).

Question 17Hazard Properties

Which of the following physical and chemical properties accurately describes Liquid Chlorine (液氯, UN 1017) during a transport leak?

  1. It vaporizes into a dense, yellowish-green gas that is ~2.5 times heavier than air, with strong oxidizing and corrosive properties that severely destroy the respiratory tract Correct answer.
  2. It is a light, colorless gas that immediately floats to the upper stratosphere without affecting ground personnel
  3. It is a highly flammable fuel gas that burns with an invisible pale-blue flame
  4. It is completely non-toxic and is commonly used as a commercial vehicle cooling spray

Explanation

Liquid Chlorine (UN 1017, Division 2.3) vaporizes rapidly upon release to form a dense yellowish-green toxic gas with a pungent suffocating odor. Being 2.45 times heavier than air, it hugs the ground, accumulates in low spots, and acts as a powerful oxidizer that reacts with respiratory moisture to form hydrochloric and hypochlorous acids, causing fatal pulmonary edema.

Question 18Packaging Docs

In a standardized UN packaging code mark (e.g. `UN 1A1/X1.8/300/26/CN/...`), what does the initial packaging type code '1A1' represent under JT/T 617.4 and GB/T 17344?

  1. Steel drum with a non-removable head (闭口钢桶) Correct answer.
  2. Steel drum with a removable head (开口钢桶)
  3. Aluminum box with reinforced wooden corners (铝木复合箱)
  4. Flexible intermediate bulk container for granular solids (柔性集装袋)

Explanation

Under UN packaging codes (JT/T 617.4 and GB 12463), the first digit '1' designates a Drum (桶); the second letter 'A' designates the construction material Steel (钢); and the third digit '1' denotes a Non-removable head / closed head (闭口). An open-head (removable head) steel drum is coded '1A2'.

Question 19Packaging Docs

In the UN packaging performance marking, which letter represents a package that has successfully passed testing for Packing Group I, II, and III substances (High, Medium, and Low Danger)?

  1. Letter 'X' (certified for Packing Groups I, II, and III) Correct answer.
  2. Letter 'Y' (certified for Packing Groups II and III only)
  3. Letter 'Z' (certified for Packing Group III only)
  4. Letter 'P' (certified for non-hazardous food products only)

Explanation

Under JT/T 617.4 and GB 12463, packaging performance test codes are: 'X' indicates the packaging meets performance tests for Packing Groups I, II, and III; 'Y' indicates testing for Packing Groups II and III; and 'Z' indicates testing for Packing Group III only. A package certified with 'X' can legally hold substances from any of the three packing groups.

Question 20Packaging Docs

Under JT/T 617.4, what type of packaging does the code '31HA1' identify in the Intermediate Bulk Container (IBC / 中型散装容器) system?

  1. Composite IBC with a rigid plastics inner receptacle and an outer steel casing, designed for liquids Correct answer.
  2. Flexible woven polypropylene bulk bag designed for free-flowing solids
  3. Pressurized cryogenic tank container for liquefied refrigerated gases
  4. Corrugated fiberboard box lined with aluminum foil for medical waste

Explanation

Under JT/T 617.4 and GB 19434, '31' designates a rigid IBC for liquids; 'H' denotes a plastics inner receptacle; 'A' denotes an outer steel casing; and '1' denotes an inner receptacle for liquids. Thus, '31HA1' is the standard composite IBC (often called a 1,000L IBC tote with steel cage) widely used for liquid chemicals.

Question 21Packaging Docs

During the transit of a road tanker vehicle loaded with dangerous liquids, in what operational state must the emergency cut-off valve (紧急切断阀) be maintained?

  1. It must remain strictly in the CLOSED (关闭) state throughout the entire journey Correct answer.
  2. It must be kept fully open to maintain continuous flow between compartments
  3. It must be set to 50% partial throttle to allow vapor balancing with atmospheric air
  4. It must be removed and stored in the driver's tool box during highway transit

Explanation

Under the Provisions on the Administration of Road Dangerous Goods Transport (MOT Order 2013 No. 2, as amended) and JT/T 617.6, the emergency cut-off valve of a tank vehicle must remain strictly closed during transportation. It is only opened during loading and unloading operations under active crew supervision. Driving with an open emergency cut-off valve defeats internal valve containment in the event of bottom piping damage.

Question 22Packaging Docs

According to the Provisions on the Administration of Road Transport of Dangerous Goods (the Provisions on the Administration of Road Dangerous Goods Transport (MOT Order 2013 No. 2, as amended)), what periodic inspection documentation must a tank vehicle (罐式车辆) hold before engaging in dangerous chemicals transport?

  1. A valid Tank Inspection Certificate (常压/压力罐体检验合格证书) issued by a certified statutory inspection agency, along with a Vehicle Road Transport Certificate Correct answer.
  2. Only a self-written inspection letter signed by the truck driver
  3. A commercial fuel receipt from an authorized highway gas station
  4. A temporary municipal sanitation pass issued by the local street committee

Explanation

Under the Provisions on the Administration of Road Dangerous Goods Transport (MOT Order 2013 No. 2, as amended) (Articles 19 and 20) and State Council Decree No. 591, cargo tanks (both atmospheric and pressure tanks) must undergo statutory periodic technical inspections by accredited testing bodies and carry a valid Tank Inspection Certificate. Using uninspected or expired tanks is strictly illegal.

Question 23Packaging Docs

Under the Measures on the Supervision and Administration of Dynamic Supervision of Road Transport Vehicles (道路运输车辆动态监督管理办法), what mandatory onboard electronics must be operational on all dangerous goods transport vehicles in China?

  1. A satellite positioning dynamic monitoring terminal (compatible with China's Beidou system) and a Vehicle Travelling Data Recorder (汽车行驶记录仪, GB/T 19056) Correct answer.
  2. A high-power consumer music entertainment sound system with subwoofers
  3. An automated radar detector to alert drivers to traffic police enforcement traps
  4. An electronic crypto-mining server connected to the vehicle 24V alternator

Explanation

Under national regulations (MOT, MPS, MEM Joint Decree 2014 No. 5) and GB/T 19056, all commercial dangerous goods vehicles must be equipped with a satellite positioning dynamic terminal (compatible with the Beidou Navigation Satellite System) that transmits real-time location, speed, and continuous driving hours to enterprise and government dynamic supervision platforms 24/7.

Question 24Dangerous Operations

What is the statutory role and responsibility of the Escort/Attendant (押运人员) during road hazardous goods transportation under the Provisions on the Administration of Road Dangerous Goods Transport (MOT Order 2013 No. 2, as amended) and JT/T 617.6?

  1. Accompanying the vehicle throughout the entire journey, supervising loading/unloading operations, safeguarding consignment notes and safety cards, and executing emergency protocols during an incident Correct answer.
  2. Replacing the driver to drive continuously for 12 hours without a commercial driver's license
  3. Selling chemical cargo samples to roadside passersby during rest stops
  4. Serving refreshments to passengers in the rear sleeper berth

Explanation

Under the Provisions on the Administration of Road Dangerous Goods Transport (MOT Order 2013 No. 2, as amended) (Articles 22 and 37), hazardous goods transport vehicles must be equipped with certified escorts (押运员). The escort must accompany the vehicle at all times, verify cargo packaging and placards, supervise loading/unloading, maintain custody of electronic/paper consignment notes and emergency response cards, and direct initial emergency actions if an incident occurs.

Question 25Dangerous Operations

Where must the Dangerous Goods Safety Card / Emergency Response Card (危险货物安全卡 / 应急处置卡) be placed during road transportation under JT/T 617.6?

  1. Inside the driver's cab, in a conspicuous and readily accessible location easily reached by the driver and escort Correct answer.
  2. Locked inside a metal safe welded under the rear axle of the trailer
  3. Mailed via postal delivery to the destination city after the truck arrives
  4. Folded and placed inside the fuel tank filler neck

Explanation

Under JT/T 617.6 and the Provisions on the Administration of Road Dangerous Goods Transport (MOT Order 2013 No. 2, as amended), the emergency response card (安全卡) must be kept readily accessible inside the cab within immediate reach of the crew, so it can be grabbed instantly during an emergency and presented to arriving fire/police first responders.

Question 26Dangerous Operations

When approaching highway tunnels or bridges posted with dangerous goods prohibition signs (禁行标志), what action must the driver of a hazardous goods vehicle take?

  1. Strictly obey the prohibition signs, do not enter the tunnel/bridge, and detour via designated alternative surface routes Correct answer.
  2. Speed up to 100 km/h to pass through the tunnel as quickly as possible
  3. Turn off vehicle headlights and hazard flashers to slip through unnoticed
  4. Discharge 50% of the cargo onto the road shoulder before entering

Explanation

Under the Road Traffic Safety Law and the Provisions on the Administration of Road Dangerous Goods Transport (MOT Order 2013 No. 2, as amended), dangerous goods vehicles are strictly prohibited from entering tunnels, long bridges, or water source protection zones marked with hazmat prohibition signs. Drivers must plan routes in advance and follow designated bypass detours.

Question 27Dangerous Operations

When a dangerous goods transport vehicle is temporarily parked during transit (such as at an expressway service area or authorized parking lot), what rule applies to the crew (driver and escort)?

  1. The crew must not leave the vehicle unattended simultaneously; at least one person must remain on duty to guard the vehicle or keep it within direct visual line of sight Correct answer.
  2. Both crew members must immediately leave the parking lot and take a taxi to the city center for entertainment
  3. The driver must hand the ignition keys to an unauthorized stranger in the parking lot
  4. The escort must sleep in an off-site hotel with their mobile phone switched off

Explanation

Under the Provisions on the Administration of Road Dangerous Goods Transport (MOT Order 2013 No. 2, as amended) (Article 37) and Five Ministries Decree 2019 No. 42, hazardous goods transport vehicles must remain under continuous custody. When parked, the driver and escort must not leave the vehicle simultaneously unattended; at least one qualified crew member must maintain surveillance to prevent theft, tampering, or undetected leaks.

Question 28Dangerous Operations

Under State Council Decree No. 591, what statutory permit must be obtained from public security organs (公安机关) before transporting Highly Toxic Chemicals (剧毒化学品) by road?

  1. A Road Transport Permit for Highly Toxic Chemicals (剧毒化学品道路运输通行证) specifying the exact vehicle, driver, escort, route, transit times, and speed limits Correct answer.
  2. A commercial tollway discount card
  3. A general freight railway bill of lading
  4. A municipal tourism bus circulation pass

Explanation

Under Article 50 of the Regulations on the Safety Administration of Dangerous Chemicals (State Council Decree No. 591), transporting highly toxic chemicals by road requires applying to the county-level public security organ for a Highly Toxic Chemicals Road Transport Permit. The vehicle must strictly follow the approved route, schedule, and speed limits specified on the permit.

Question 29Dangerous Operations

According to the dangerous goods mixed loading segregation table in JT/T 617.6, which of the following combinations of goods is STRICTLY PROHIBITED from being loaded together in the same vehicle compartment?

  1. Class 1 Explosives and Class 3 Flammable Liquids Correct answer.
  2. Two different brands of bottled pure drinking water
  3. Class 3 Gasoline (UN 1203) and Class 3 Diesel (UN 1202) in separate certified compartmentalized tanks
  4. Dry wooden pallets and clean empty plastic containers

Explanation

Under JT/T 617.6 (Mixed loading segregation table), Class 1 Explosives must not be loaded in the same transport unit with Class 3 Flammable Liquids, Class 4 Flammables, Class 5 Oxidizers, or Class 8 Corrosives. The presence of flammable liquids dramatically amplifies the risk of fire and mass detonation.

Question 30Dangerous Operations

Under JT/T 617.6 and the Provisions on the Administration of Road Dangerous Goods Transport (MOT Order 2013 No. 2, as amended), what is the absolute restriction regarding transporting Class 6.1 Toxic Substances or Class 6.2 Infectious Substances together with foodstuffs (食品) or animal feed?

  1. They are strictly prohibited from being transported in the same vehicle compartment or container with food, beverages, medicines, or animal feed under any circumstance Correct answer.
  2. They may be co-loaded if the food items are placed directly on top of the toxic chemical drums
  3. They may be co-loaded if the driver washes their hands before driving
  4. They may be co-loaded as long as the food is consumed within 24 hours of delivery

Explanation

Under JT/T 617.6 (Clause 6.3) and MOT regulations, toxic substances (Class 6.1) and infectious substances (Class 6.2) must never be loaded together with food, edible products, beverages, pharmaceuticals, or animal feed. Cross-contamination during transit can cause catastrophic widespread fatal mass poisonings.

Question 31Dangerous Operations

According to the Provisions on the Administration of Road Transport of Dangerous Goods (the Provisions on the Administration of Road Dangerous Goods Transport (MOT Order 2013 No. 2, as amended)), what is the strict rule regarding carrying unauthorized passengers in dangerous goods vehicles?

  1. It is strictly forbidden to carry any unauthorized personnel or passengers unrelated to transport operations in the vehicle cab Correct answer.
  2. Up to 10 paying hitchhikers may ride on the rear tanker ladder for short distances
  3. Passengers are permitted if they agree to wear safety goggles
  4. Any passenger carrying an open flame matchbox may ride for free

Explanation

Under the Provisions on the Administration of Road Dangerous Goods Transport (MOT Order 2013 No. 2, as amended) (Article 37), hazardous goods transport vehicles are strictly prohibited from carrying passengers or unauthorized individuals. Only the qualified driver and certified escort(s) assigned on the transport consignment note are legally permitted in the vehicle cab.

Question 32Dangerous Incident

When reporting a road hazardous goods transport accident to emergency services (119 Fire & Rescue, 122 Traffic Police, 110 Public Security, 120 Medical), which vital information must the driver or escort report first?

  1. Accurate incident location (highway kilometer marker), 4-digit UN Number and Proper Shipping Name, Hazard Class, leak/fire status, casualty count, and prevailing wind direction Correct answer.
  2. The wholesale market price of the chemical and the customer's delivery discount
  3. The driver's personal monthly salary and insurance policy dividend numbers
  4. The weather forecast for next week in a different province

Explanation

Under the Provisions on the Administration of Road Dangerous Goods Transport (MOT Order 2013 No. 2, as amended) and emergency dispatch standards, accurate emergency reporting requires stating: the exact road kilometer stake location, UN Number and chemical name (from the Consignment Note/Safety Card), hazard class, approximate leakage/fire scale, number of casualties/trapped persons, and wind direction so emergency commanders can dispatch appropriate specialized chemical response units.

Question 33Dangerous Incident

When public emergency responders (Fire & Rescue, Traffic Police) arrive on the scene of a dangerous goods vehicle incident, what is the primary duty of the transport driver and escort?

  1. Immediately report to the Incident Commander, provide the Dangerous Goods Transport Consignment Note, Safety Emergency Card, and MSDS, and brief responders on cargo properties, tank valves, and trapped crew Correct answer.
  2. Flee the scene into nearby mountain forests to avoid police questioning
  3. Order the Fire Commander to leave the scene immediately
  4. Sell the vehicle's spare tires to approaching emergency vehicle drivers

Explanation

Under the Provisions on the Administration of Road Dangerous Goods Transport (MOT Order 2013 No. 2, as amended) (Article 43), upon the arrival of emergency rescue teams, the transport crew must immediately report to the commander, hand over the consignment note, emergency card, and chemical safety data sheet (MSDS), and provide critical operational details regarding cargo volume, tank valve locations, and current leak containment status.

Question 34Dangerous Incident

During an emergency transloading (倒罐 / 抽油) operation where flammable liquid is transferred from a damaged tanker into a relief tanker, what critical electrostatic safety requirement must be enforced?

  1. Both tankers, the transfer pump, and conductive transfer hoses must be equipotentially bonded together and connected to a reliable earth grounding point Correct answer.
  2. All transfer pumps must be powered by open non-explosion-proof lawnmower engines
  3. Crew members must wear dry synthetic polyester sweaters that generate maximum static sparks
  4. The transfer hose must be dropped freely through the air from a height of 5 meters without grounding

Explanation

Under JT/T 617.6 and chemical emergency transloading guidelines, transferring flammable liquids creates extreme electrostatic charge generation. Both the damaged vessel, receiving vessel, pump, and conductive hoses must be equipotentially bonded (等电位跨接) and grounded to earth before pumping begins to eliminate electrostatic spark ignition.

Question 35Hazard Properties

An exercise supplies a compatibility chart showing that products P and Q react dangerously together, although both are corrosive. What follows?

  1. Ignore the chart if both containers are sealed.
  2. Mix small samples to check whether the chart is correct.
  3. Treat them as compatible because the class is the same.
  4. Use the incompatibility information when assessing segregation. Correct answer.

Explanation

The shared corrosive class does not establish chemical compatibility. The supplied reaction information remains relevant even when each package appears closed and intact.

Question 36Hazard Properties

A shipment record lists a principal toxic hazard and a subsidiary flammable hazard. Which interpretation is sound?

  1. Both hazards must inform the assessment. Correct answer.
  2. Only the first-listed hazard matters.
  3. Flammability cancels the toxic classification.
  4. The subsidiary hazard applies only after unloading.

Explanation

A subsidiary hazard is additional relevant information rather than an optional warning. Both toxic exposure and ignition risks may affect the actual shipment.

Question 37Hazard Properties

The stated gas in a training case is nonflammable but can displace oxygen in an enclosed compartment. Why can entry still be dangerous?

  1. A nonflammable classification proves the compartment is breathable.
  2. Only flammable gases can threaten breathing.
  3. Opening a small inspection cover proves the entire space is safe.
  4. Oxygen deficiency can occur without a combustible atmosphere. Correct answer.

Explanation

The supplied oxygen-displacement property creates an asphyxiation risk independently of flammability. A material label alone cannot demonstrate a safe breathing atmosphere.

Question 38Hazard Properties

A product trade name matches a familiar shipment, but its concentration and transport description differ. What should control classification?

  1. The actual product information and applicable transport entry. Correct answer.
  2. The color of the delivery vehicle.
  3. The remembered classification of the familiar product.
  4. The driver's preferred hazard category.

Explanation

A familiar trade name is insufficient when composition and transport information differ. The actual material and applicable entry must be established instead of guessed.

Question 39Hazard Properties

A material is described as an oxidizer. Which misconception should be rejected?

  1. Its hazards must be checked in the actual material information.
  2. It cannot intensify a fire unless it is itself the ordinary fuel. Correct answer.
  3. It can contribute to another material's combustion.
  4. Its compatibility with nearby combustible materials matters.

Explanation

The false statement confuses an oxidizer's role with that of an ordinary combustible fuel. An oxidizer may intensify combustion of another material.

Question 40Hazard Properties

A hypothetical material sheet gives a permitted temperature range of 10 to 30 degrees Celsius. The recorded package temperature is 36 degrees. What does the supplied model show?

  1. The stated maximum applies only to the paperwork.
  2. The range can be averaged to authorize 36 degrees.
  3. The value is acceptable because it is above the minimum.
  4. The temperature is outside the stated range. Correct answer.

Explanation

Thirty-six degrees exceeds the supplied maximum of thirty degrees. This demonstrates a model discrepancy, not a newly asserted Chinese statutory temperature threshold.

Question 41Hazard Properties

An exercise states that a released vapor is heavier than air. Which location deserves particular concern, subject to actual conditions?

  1. Every elevated position is guaranteed safe.
  2. Any place without a strong odor is safe.
  3. A low depression where vapor may collect. Correct answer.
  4. Only the vehicle roof can contain the vapor.

Explanation

The supplied density comparison supports concern about accumulation in low places. Wind, temperature and confinement still matter, so this is not a guaranteed safe-zone prediction.

Question 42Hazard Properties

Two hazard labels appear on a package. A learner proposes covering one to make recognition simpler. What is the problem?

  1. It would conceal relevant hazard information. Correct answer.
  2. One visible label automatically satisfies all shipment conditions.
  3. Removing a label eliminates the corresponding physical hazard.
  4. The driver can choose whichever hazard seems easiest.

Explanation

Physical hazards are not removed by hiding their information. The actual required markings and shipment details must remain accurate and appropriately visible.

Question 43Hazard Properties

A case identifies a material as water-reactive. What is the sound knowledge conclusion?

  1. A small unprotected trial is the best identification method.
  2. Water is universally suitable for every road-cargo fire.
  3. Do not assume water is a suitable response merely because heat or fire is present. Correct answer.
  4. Foam always avoids a reaction because it is not a solid stream.

Explanation

The supplied water-reactive property defeats a universal water-response assumption. Use the actual material information, emergency plan and trained response rather than an improvised trial.

Question 44Hazard Properties

A tank is unloaded but has not been cleaned or assessed. Which conclusion is justified?

  1. Unloading proves that entry is safe.
  2. No remaining visible liquid means no hazardous vapor.
  3. All transport hazards disappear when the delivery note is signed.
  4. Hazardous residue or atmosphere may remain. Correct answer.

Explanation

Removing the main load does not demonstrate that residues or vapors are absent. Empty and safe are separate conclusions requiring the appropriate assessment.

Question 45Packaging Docs

A package approval is valid for a specified material and closure arrangement. Which change needs actual reassessment?

  1. Substituting a different seal material. Correct answer.
  2. Checking that the approved closure is present.
  3. Reading the same approved instructions again.
  4. Recording the correct existing package identity.

Explanation

Changing the seal can alter containment compatibility and performance. The original approval cannot be presumed to cover a different component merely because the package looks similar.

Question 46Packaging Docs

A shipment has 12 packages, each with a stated gross mass of 20 kg. What is their combined gross mass?

  1. 240 kg Correct answer.
  2. 200 kg
  3. 12 kg
  4. 24 kg

Explanation

Multiply twelve packages by twenty kilograms per package to obtain two hundred forty kilograms. Gross package mass is the quantity supplied; do not silently replace it with net contents.

Question 47Packaging Docs

A hypothetical vehicle has 500 kg remaining total capacity, but a proposed 70 kg item would exceed a compartment's stated 50 kg limit. What follows?

  1. The independent compartment limit would be exceeded. Correct answer.
  2. Unused total capacity cancels every component limit.
  3. Only the invoice mass matters.
  4. The item is acceptable because 70 is less than 500.

Explanation

The vehicle total and compartment limits are independent. Seventy kilograms exceeds the given fifty-kilogram compartment limit even though overall capacity remains available.

Question 48Packaging Docs

An exercise states net contents of 18 kg and a package tare mass of 2 kg. What is the gross package mass?

  1. 20 kg Correct answer.
  2. 16 kg
  3. 36 kg
  4. 18 kg

Explanation

Gross package mass includes the contents and the stated empty packaging. Eighteen plus two equals twenty kilograms under the supplied model definitions.

Question 49Packaging Docs

The consignment record and actual package show different material identifiers. What is the appropriate conclusion?

  1. Assume the paperwork is always right.
  2. Assume the package is always right without checking.
  3. Alter the label to whichever number is easier to recognize.
  4. The discrepancy needs resolution through the authorized process. Correct answer.

Explanation

Conflicting identifiers undermine a reliable dispatch assessment. Neither source should be arbitrarily declared correct or altered to conceal the disagreement.

Question 50Packaging Docs

A closure has visible damage, but the safety document is complete. What does the document establish?

  1. It authorizes an extra label instead of repair.
  2. It repairs the closure's containment performance.
  3. It does not establish that the damaged closure is fit. Correct answer.
  4. It removes the need for a package-condition check.

Explanation

Documentation and physical integrity are separate checks. A complete document cannot restore a damaged closure or prove that containment remains suitable.