• 279 questions

Hazmat Practice Test From the Federal Hazardous Materials Rules

On this hazmat CDL practice test, tap an answer to see the 49 CFR section behind it.

Which division covers spontaneously combustible material?

Pick an answer, then press Check answer. Then you see Correct or Not quite, with the reason. Keys: 1 to 3 pick, Enter checks.

Print covers the next 30 questions. Share this set copies a link to the same questions in the same order.

Exam mode: 30 questions, no time limit, 24 right to pass (80%).

More options

Unofficial practice questions, not affiliated with the FMCSA or any state licensing agency. Bank checked October 3, 2026.

Next step Hazmat on a bus: passenger test

All 279 questions

Classes, divisions and definitions 35

  • A combustible liquid has a flash point in what range? 49 CFR 173.120(b)(1)
  • A cryogenic liquid is a refrigerated liquefied gas with a boiling point colder than what? 49 CFR 173.115(g)
  • A flammable liquid has a flash point of 38 °C (100 °F) or higher and meets no other hazard class. It moves by highway only. How may it be reclassed? 49 CFR 173.120(b)(2)
  • A liquid in a bulk packaging counts as an elevated temperature material when it is offered at or above what temperature? 49 CFR 171.8, Elevated temperature material
  • A material gives off flammable gas when it touches water. Which division is it? 49 CFR 173.124(c)
  • A material meets the defining criteria for more than one hazard class. To how many hazard classes is it assigned? 49 CFR 171.8, Hazard class
  • A material not listed by name meets the definitions of both Class 7 and Class 8. Which class ranks first in the precedence list? 49 CFR 173.2a(a)
  • A packaging for liquids has no intermediate form of containment. Above what maximum capacity is it a bulk packaging? 49 CFR 171.8, Bulk packaging
Show all 279 questions (271 more)

Classes, divisions and definitions, continued

  • A pyrophoric material can ignite within how long after coming in contact with air? 49 CFR 173.124(b)(1)
  • A toxic material is a gas at 20 °C. Can it be classed in Division 6.1? 49 CFR 173.132(a)
  • An identification number begins with the letters NA instead of UN. What does that tell you? 49 CFR 172.101(e)
  • Apart from damage to human skin, a liquid is Class 8 when it has a severe corrosion rate on which metals? 49 CFR 173.136(a)
  • Column 3 of the Hazardous Materials Table shows the word Forbidden for a material. What does that mean? 49 CFR 172.101(d)(1)
  • How does 49 CFR 173.50 describe a mass explosion? 49 CFR 173.50(b)(1)
  • How many hazard zones are there for Division 2.3 gases, and which one is the most toxic? 49 CFR 173.116(a)
  • In Column 2 of the Hazardous Materials Table, which entries are proper shipping names? 49 CFR 172.101(c)
  • In the explosives classification code 1.4S, what is the letter S? 49 CFR 173.52(a)
  • The letter D appears in Column 1 of the Hazardous Materials Table. What does it identify? 49 CFR 172.101(b)(3)
  • Liquids that are poisonous by inhalation are assigned to how many hazard zones? 49 CFR 171.8, Hazard zone
  • May the word inflammable be used in place of flammable in a proper shipping name? 49 CFR 172.101(c)(1)
  • Organic peroxides are sorted into seven generic types, A through G. Which type is forbidden in transportation? 49 CFR 173.128(b)(1)
  • Packing Group I tells you the degree of danger is what? 49 CFR 172.101(f)
  • The transport index on a radioactive label comes from the radiation level measured how far from the package? 49 CFR 173.403, Transport index
  • What does Division 6.2 cover? 49 CFR 173.134(a)(1)
  • What does flash point mean in 49 CFR 173.120? 49 CFR 173.120(c)(1)
  • What is the highest flash point a liquid can have and still be a Class 3 flammable liquid under the general definition? 49 CFR 173.120(a)
  • What kind of hazard do Division 1.4 explosives present? 49 CFR 173.50(b)(4)
  • What makes a material a Division 5.1 oxidizer? 49 CFR 173.127(a)
  • What sets Division 1.5 apart from Division 1.1? 49 CFR 173.50(b)(5)
  • When is a material a hazardous substance under 49 CFR 171.8? 49 CFR 171.8, Hazardous substance
  • Which division covers spontaneously combustible material? 49 CFR 173.2
  • Which division holds explosives that have a projection hazard but not a mass explosion hazard? 49 CFR 173.50(b)(2)
  • Which division is defined simply as explosives that have a mass explosion hazard? 49 CFR 173.50(b)(1)
  • Which of these has no packing group in the Hazardous Materials Table? 49 CFR 172.101(f)
  • Which of these is a Class 9 material by definition? 49 CFR 173.140

Shipping papers 29

  • A carrier takes a shipper's word for what is in a sealed package. When may the carrier rely on that information? 49 CFR 171.2(f)
  • A driver carries the hazmat shipping paper together with other papers. How must it stand out? 49 CFR 177.817(e)(1)
  • A load moves under a special permit. What must the shipping paper show? 49 CFR 172.203(a)
  • A material is not a hazardous material under the rules. May its shipping paper entry show a hazard class or an identification number? 49 CFR 172.202(e)
  • A packaging holds only the residue of a hazardous material. Which phrase may be added to the basic description? 49 CFR 172.203(e)
  • A shipper hauls its own hazardous material as a private carrier and will not reship it. The load is not a hazardous waste. Is the shipper's certification needed? 49 CFR 172.204(b)
  • A shipper offers a hazardous material that needs a shipping paper but hands the carrier no paper. May the carrier take the load? 49 CFR 177.817(a)
  • A shipper wants to abbreviate the proper shipping name to save space on the paper. Is that allowed? 49 CFR 172.201(a)(3)
  • A shipper wants to add handling notes to a shipping paper. Where may the extra information go? 49 CFR 172.201(a)(4)
  • A shipping paper lists hazardous and non-hazardous items together. Which is an approved way to set the hazardous entries apart? 49 CFR 172.201(a)(1)
  • A shipping paper reads: UN2744, Cyclobutyl chloroformate, 6.1, (8, 3), PG II. What do the numbers in parentheses show? 49 CFR 172.202(a)(3)
  • A shipping paper runs to four pages. What must the first page show? 49 CFR 172.201(c)
  • Acetone is shipped as a hazardous waste. How is the proper shipping name written? 49 CFR 172.101(c)(9)
  • An elevated temperature material has a proper shipping name that does not show it is hot. What does the shipping paper need? 49 CFR 172.203(n)
  • Besides the total quantity, what must the shipping paper say about the packages? 49 CFR 172.202(a)(7)
  • The driver steps away from a placarded truck. Where does the shipping paper go? 49 CFR 177.817(e)(2)(ii)
  • How is the packing group written in the basic description? 49 CFR 172.202(a)(4)
  • How long must a motor carrier keep a copy of the shipping paper for a hazardous material that is not a hazardous waste? 49 CFR 177.817(f)
  • How long must a shipper keep a copy of a shipping paper for a material that is not a hazardous waste? 49 CFR 172.201(e)
  • How may the shipper's certification be signed? 49 CFR 172.204(d)
  • In what order must the basic description appear on a shipping paper? 49 CFR 172.202(a) and (b)
  • The letter G sits in Column 1 of the table for a proper shipping name. What must the shipping paper add? 49 CFR 172.203(k)
  • On a shipping paper with an HM column, what may replace the X for a hazardous substance? 49 CFR 172.201(a)(1)(iii)
  • The total quantity must appear on a shipping paper. For a bulk package, what may be shown instead of a weight or volume? 49 CFR 172.202(a)(5)
  • What document must travel with a shipment of hazardous waste? 49 CFR 172.205
  • What extra entry does a shipping paper need for a material poisonous by inhalation? 49 CFR 172.203(m)
  • Where do the letters RQ go when a package holds a hazardous substance? 49 CFR 172.203(c)
  • Which words follow the basic description when a material is shipped as a limited quantity? 49 CFR 172.203(b)
  • While the driver is at the controls, where must the hazmat shipping paper be? 49 CFR 177.817(e)(2)(i)

Marking and identification numbers 21

  • A bulk packaging carries an elevated temperature material. What marking goes on two opposing sides? 49 CFR 172.325
  • A bulk packaging has been emptied but not cleaned. What happens to its identification number markings? 49 CFR 172.302(d)
  • A bulk packaging holds 1,000 gallons or more. Where must its identification number be marked? 49 CFR 172.302(a)(1)
  • A bulk packaging holds a material poisonous by inhalation. Where is the Inhalation Hazard marking required? 49 CFR 172.313(a)
  • A bulk packaging holds less than 1,000 gallons. Where must its identification number be marked? 49 CFR 172.302(a)(2)
  • A carton is printed with a hazmat shipping name and UN number but now holds ordinary freight. May it be shipped that way? 49 CFR 172.303
  • A compartmented cargo tank carries gasoline and diesel fuel. Under the special provisions, which identification number may be displayed? 49 CFR 172.336(c)
  • A fiberboard box holds inner bottles of a liquid hazardous material. Where do the orientation arrows go? 49 CFR 172.312(a)
  • A non-bulk package normally carries the consignee's or consignor's name and address. When may a highway shipment go without it? 49 CFR 172.301(d)
  • A van is loaded at one facility with 1,000 kg (2,205 pounds) of non-bulk packages of a single Zone B inhalation hazard material. What must the vehicle show besides placards? 49 CFR 172.313(c)
  • A van is loaded at one facility with 4,000 kg (8,820 pounds) of a single hazardous material in non-bulk packages and nothing else. What marking does the vehicle need? 49 CFR 172.301(a)(3)
  • An identification number is shown on a plain white square-on-point. Does that display count as a placard? 49 CFR 172.336(b)
  • An identification number marking is lost on the road. How may the carrier replace it for the time being? 49 CFR 172.338
  • How large is the orange panel used for identification numbers? 49 CFR 172.332(b)(1)
  • Identification numbers on a vehicle may be displayed in three ways. Which is one of them? 49 CFR 172.332(a)
  • May a package of liquid hazardous material carry arrows that are there for some other purpose? 49 CFR 172.312(b)
  • On most non-bulk packages, how tall must the identification number marking be? 49 CFR 172.301(a)(1)
  • On which of these placards may an identification number NOT be displayed? 49 CFR 172.334(a)
  • What does the limited quantity mark look like? 49 CFR 172.315(a)
  • What must be marked on a non-bulk package of hazardous material? 49 CFR 172.301(a)(1)
  • Which of these is a rule for every required hazmat marking? 49 CFR 172.304(a)

Labels 19

  • A box holds inner packagings of two different hazard classes. How is the outer package labeled? 49 CFR 172.404(a)
  • A material has a primary hazard and a subsidiary hazard listed in Column 6 of the table. How is the package labeled? 49 CFR 172.402(a)
  • A non-bulk package has a volume of 1.8 cubic meters (64 cubic feet) or more. How must it be labeled? 49 CFR 172.406(e)
  • A package contains a highway route controlled quantity of radioactive material. Which label must it bear? 49 CFR 172.403(c)
  • A package needs a primary and a subsidiary hazard label. How close together must they be? 49 CFR 172.406(c)
  • A radioactive package has a transport index of 0.8, but its surface radiation level is 0.6 mSv/h (60 mrem/h). Which label does it need? 49 CFR 172.403(b) and (c)
  • A reused box still shows a FLAMMABLE LIQUID label but now holds paper towels. May it be shipped that way? 49 CFR 172.401
  • How big is a standard diamond-shaped hazard label? 49 CFR 172.407(c)(1)
  • How long must a hazard label be able to stand up to the weather? 49 CFR 172.407(a)
  • How many RADIOACTIVE labels does a labeled non-bulk package need, and where? 49 CFR 172.403(f)
  • On a CORROSIVE label, what color must the text and the class number be? 49 CFR 172.407(d)(2)
  • What appears in the lower corner of a primary or subsidiary hazard label? 49 CFR 172.402(b)
  • What is written in the blank spaces of a RADIOACTIVE YELLOW label? 49 CFR 172.403(g)
  • Where on a package does a hazard label belong? 49 CFR 172.406(a)
  • Which label goes on a Division 6.1 liquid that is an inhalation hazard in Zone A or B? 49 CFR 172.400(b)
  • Which label goes on a package of a Division 2.3 material? 49 CFR 172.400(b)
  • Which material needs no hazard label on its package? 49 CFR 172.400(b)
  • Which of these generally must carry hazard warning labels? 49 CFR 172.400(a)
  • Which radioactive label marks the lowest category? 49 CFR 172.403(b)

Placards 30

  • A box trailer hauls a combustible liquid in 55-gallon drums. Is a COMBUSTIBLE placard required? 49 CFR 172.500(b)(5)
  • A bulk packaging that needed placards is emptied but not cleaned. What about its placards? 49 CFR 172.514(b)
  • A cargo tank hauls a combustible liquid. Which placard may be used in place of COMBUSTIBLE? 49 CFR 172.504(f)(2)
  • A cargo tank hauls gasoline by highway. Which word may replace FLAMMABLE on its placard? 49 CFR 172.542(c)
  • A carrier displays placards for a hazardous material even though the amount on board is too small to require them. Is that legal? 49 CFR 172.502(c)
  • A carrier wants to hang a diamond-shaped Drive Safely sign on its trailers. Is that allowed? 49 CFR 172.502(a)(2)
  • A Class 3 liquid is also poisonous by inhalation. How is the vehicle placarded? 49 CFR 172.505(a)
  • A load of radioactive packages needs the RADIOACTIVE placard when the packages bear which label? 49 CFR 172.504(e), Table 1
  • A material has a subsidiary hazard of dangerous when wet. What does the vehicle need? 49 CFR 172.505(c)
  • A mixed load under a DANGEROUS placard includes 2,500 pounds of one Table 2 category, all loaded at one facility. What changes? 49 CFR 172.504(b)
  • A trailer holds Division 1.2 and Division 1.4 explosives. Which explosives placard is displayed? 49 CFR 172.504(f)(1)
  • A truck carries 800 pounds gross weight of Table 2 materials in non-bulk packages. Are placards required? 49 CFR 172.504(c)
  • A truck carries non-flammable gas and flammable gas and is placarded FLAMMABLE GAS. Is the NON-FLAMMABLE GAS placard also required? 49 CFR 172.504(f)(3)
  • A vehicle placarded EXPLOSIVES 1.1 also carries Division 5.1 material. Is the OXIDIZER placard required? 49 CFR 172.504(f)(4)
  • Does the 1,001-pound placarding exception cover a bulk packaging? 49 CFR 172.504(c)
  • For domestic transportation of oxygen, which placard may replace NON-FLAMMABLE GAS? 49 CFR 172.504(f)(7)
  • How big is a standard placard? 49 CFR 172.519(c)(1)
  • How far must a placard be from other markings, such as advertising, that could reduce its effectiveness? 49 CFR 172.516(c)(4)
  • How is the RADIOACTIVE placard displayed for a highway route controlled quantity? 49 CFR 172.507(a)
  • How must the words on a placard read? 49 CFR 172.516(c)(5)
  • Is a CLASS 9 placard required for a domestic highway shipment? 49 CFR 172.504(f)(9)
  • On a tractor-trailer, where may the front placard be placed? 49 CFR 172.516(b)
  • To which of these does the placarding subpart NOT apply? 49 CFR 172.500(b)
  • What does a DANGEROUS placard look like? 49 CFR 172.521
  • When may a DANGEROUS placard be used? 49 CFR 172.504(b)
  • Where on a transport vehicle must required placards be displayed? 49 CFR 172.504(a)
  • Which of these loads must be placarded no matter how little is on board? 49 CFR 172.504(e), Table 1
  • Which placard does Table 2 call for on a load of Division 6.2 infectious substances? 49 CFR 172.504(e), Table 2
  • Who must keep placards clean and legible during the trip? 49 CFR 172.516(c)(6)
  • Who supplies the placards for a highway shipment that needs them? 49 CFR 172.506(a)

Loading and unloading 28

  • A catalytic cargo heater is fitted to a van that hauls Division 2.1 gas. When may the heater NOT be ignited? 49 CFR 177.834(l)(2)(i)(B)
  • A diesel-fired cargo heater is used with a load of Class 3 liquids. What is the hottest it may make any part of the cargo? 49 CFR 177.834(l)(2)(i)(A)
  • A Division 6.2 material leaks from its packaging during a trip. What must happen before the vehicle is used again? 49 CFR 177.843(d)
  • A package carries orientation arrows. How must it ride? 49 CFR 177.834(b)
  • A package labeled POISON, not marked PG III, is to go in a van that also carries animal feed. When is that allowed? 49 CFR 177.841(e)(1)
  • A set of doubles has a placarded cargo tank as one of its units. May the other trailer carry Division 1.2 explosives? 49 CFR 177.835(c)
  • A trailer with a cargo heater is loaded with Class 1 explosives. What must be done with the heater? 49 CFR 177.834(l)(1)
  • Bagged nitrates are to be loaded. What condition must the vehicle be in? 49 CFR 177.838(f)
  • Between the point of origin and the billed destination, what does 49 CFR 177.834(h) say about the containers on board? 49 CFR 177.834(h)
  • Class 1 explosives are carried on an open flat-bed. How must the load be protected? 49 CFR 177.835(h)
  • Division 1.1 explosives may not ride in a combination that includes a full trailer with a wheelbase shorter than what? 49 CFR 177.835(c)
  • Division 1.1 explosives must be moved to another vehicle on a public highway because of an emergency. What does the rule require? 49 CFR 177.835(j)
  • How must cylinders of Class 2 gas be carried on a truck? 49 CFR 177.840(a)(1)
  • How must packages of Class 7 material be loaded so they do not move in transit? 49 CFR 177.842(d)
  • How must packages of hazardous material that are not permanently attached to the vehicle be loaded? 49 CFR 177.834(a)
  • May a small package with a POISON label ride in the cab with the driver? 49 CFR 177.841(e)(2)
  • Outside exclusive use shipments, what is the highest total transport index allowed in one vehicle? 49 CFR 177.842(a)
  • Radioactive packages are split into groups in a vehicle or storage area. How far apart must the groups be? 49 CFR 177.842(b)(2)
  • Radioactive YELLOW-II packages in a van have a total transport index of 4.0. How far must they be kept from a space that people occupy? 49 CFR 177.842(b)
  • Some Class 4 and Class 5 materials become more hazardous when wet. What does the loading rule ask for? 49 CFR 177.838(b)
  • Storage batteries with electrolyte are loaded with other freight. What protection do they need? 49 CFR 177.839(b)
  • Two packagings of a Division 6.1 liquid are joined by a hose. May they be transported that way? 49 CFR 177.841(c)
  • What is the general rule about the engine while Class 1 explosives are loaded or unloaded? 49 CFR 177.835(a)
  • What must be true of the vehicle before any hazardous material is loaded or unloaded? 49 CFR 177.834(e)
  • Where may packagings of nitric acid of 50 percent or greater concentration NOT be loaded? 49 CFR 177.839(a)
  • Which of these loads is named in 49 CFR 177.834(c), the rule against smoking on or about the vehicle during loading and unloading? 49 CFR 177.834(c)
  • Which of these may NOT be used to load or unload Class 1 explosives? 49 CFR 177.835(b)
  • Which tools are ruled out for loading and unloading hazardous material? 49 CFR 177.834(f)

Segregation 22

  • A Division 2.3 gas in Hazard Zone B is to be loaded with Class 3 flammable liquids. What does the table show? 49 CFR 177.848(d)
  • A Division 6.1 liquid in Packing Group I, Hazard Zone A, is to be loaded with Class 3 flammable liquids. What does the rule say? 49 CFR 177.848(c)
  • A material has a subsidiary hazard that the segregation table treats more strictly than its primary hazard. Which one controls? 49 CFR 177.848(e)(6)
  • Division 1.2 and Division 1.4 explosives of the same compatibility group are loaded together. How is the whole shipment treated? 49 CFR 177.848(h)
  • Division 1.5D material rides in the same freight container as Division 1.2D material. How is the shipment transported? 49 CFR 177.848(i)
  • Even where the table shows O, where may Class 8 corrosive liquids NOT be loaded? 49 CFR 177.848(e)(3)
  • Explosives in compatibility group L may share a vehicle with which other explosives? 49 CFR 177.848(g)
  • In the Class 1 compatibility table, what does an X between two compatibility groups mean? 49 CFR 177.848(g)
  • In the segregation table an asterisk appears where two Class 1 entries meet. What does it tell you? 49 CFR 177.848(e)(4)
  • In the segregation table, what does the letter O mean where two classes meet? 49 CFR 177.848(e)(3)
  • In the segregation table, what does the letter X mean where two classes meet? 49 CFR 177.848(e)(2)
  • Note A in the segregation table makes an exception to the X for explosives. Which material may be loaded with Division 1.1 or 1.5 explosives? 49 CFR 177.848(e)(5)
  • The segregation rules cover labeled and placarded packages. What else do they cover? 49 CFR 177.848(a)
  • What does the segregation table show for Class 3 flammable liquids against a Division 2.3 gas in Hazard Zone A? 49 CFR 177.848(d)
  • What does the segregation table show for Class 3 flammable liquids against Division 5.1 oxidizers? 49 CFR 177.848(d)
  • What does the segregation table show for Class 7 radioactive material against Division 2.1 flammable gas? 49 CFR 177.848(d)
  • What does the segregation table show for Division 1.1 explosives against Class 8 corrosive liquids? 49 CFR 177.848(d)
  • What does the segregation table show for Division 1.4 explosives against Class 3 flammable liquids? 49 CFR 177.848(d)
  • What does the segregation table show for Division 2.2 non-flammable gas against Class 3 flammable liquids? 49 CFR 177.848(d)
  • What does the segregation table show for Division 4.2 materials against Class 8 liquids? 49 CFR 177.848(d)
  • Where two classes meet in the segregation table and the space is blank, what does that mean? 49 CFR 177.848(e)(1)
  • Why may cyanides not be loaded with acids? 49 CFR 177.848(c)

Driving, parking and routes 37

  • The 25-foot smoking rule also covers an EMPTY tank motor vehicle that last carried what? 49 CFR 397.13(b)
  • A city restricts hazardous materials in its tunnel. What does 49 CFR 177.810 say about rules of that kind? 49 CFR 177.810
  • A commercial vehicle carries one small cylinder of chlorine. Must it stop at railroad grade crossings? 49 CFR 392.10(a)(2)
  • A driver wants to park a load of Division 1.3 explosives on private property. What is needed? 49 CFR 397.7(a)(2)
  • A highway route controlled quantity of radioactive material generally moves over preferred routes. What is a preferred route? 49 CFR 397.101(b)
  • A local law on parking placarded vehicles differs from the federal rule. Which does the driver follow? 49 CFR 397.3
  • A person in charge is not on the vehicle. How close must that person be for the vehicle to count as attended? 49 CFR 397.5(d)(1)
  • A route through a crowded downtown would save a placarded truck twenty minutes. Does that justify it? 49 CFR 397.67(c)
  • A tire check finds a flat tire on a placarded truck. How far may the truck be driven before the repair? 49 CFR 397.17(b)
  • A tire check on a placarded truck finds an overheated tire. What must the driver do? 49 CFR 397.17(c)
  • A trip with Division 1.1 explosives begins somewhere other than the carrier's terminal. Who may prepare the written route plan? 49 CFR 397.67(d)
  • A truck carries Division 1.1 explosives. When must it be attended? 49 CFR 397.5(a)
  • A truck placarded CORROSIVE approaches an ordinary railroad grade crossing with no exception posted. Must it stop? 49 CFR 392.10(a)(3)
  • A truck placarded FLAMMABLE stops on the shoulder. What does 49 CFR 397.7(b) say? 49 CFR 397.7(b)
  • A truck placarded for Class 8 is on a public street. Must the driver attend it? 49 CFR 397.5(c)
  • Besides the Part 397 rules and the emergency instructions, what must the driver of a Division 1.1 load have in possession? 49 CFR 397.19(c)
  • The driver of a placarded truck is asleep in the sleeper berth at a highway rest stop. Is the vehicle attended? 49 CFR 397.5(d)(1)
  • The driver signs a receipt for the documents furnished with a load of Division 1.2 explosives. How long does the carrier keep it? 49 CFR 397.19(b)
  • Except for brief periods when operations make it necessary, a vehicle with Division 1.1 explosives may not be parked within what distance of a bridge, tunnel or dwelling? 49 CFR 397.7(a)(3)
  • How close to the traveled portion of a public street or highway may a vehicle with Division 1.2 explosives be parked? 49 CFR 397.7(a)(1)
  • How far from an open fire must a vehicle containing hazardous materials be parked? 49 CFR 397.11(b)
  • How promptly must shipments of hazardous materials be moved? 49 CFR 177.800(d)
  • In the Part 397 routing rules, what does NRHM stand for? 49 CFR 397.65
  • No State routing designation applies. Which places must a placarded non-radioactive load avoid where it can? 49 CFR 397.67(b)
  • The placards have been lost from a loaded vehicle. When may it still be moved? 49 CFR 177.823(a)
  • Section 177.804(b) applies three driving rules by name to drivers of placarded loads. One is safe clearance at railroad crossings. Which are the other two? 49 CFR 177.804(b)
  • There is an open fire near the road ahead. When may a vehicle containing hazardous materials drive past it? 49 CFR 397.11(a)
  • What does 49 CFR 397.1 expect of a driver who operates a vehicle that must be marked or placarded? 49 CFR 397.1(b)
  • What is a safe haven under 49 CFR 397.5? 49 CFR 397.5(d)(3)
  • What is the rule for the engine when a placarded vehicle is being fueled? 49 CFR 397.15(a)
  • What must a carrier hand to the driver of a load of Division 1.1 explosives? 49 CFR 397.19(a)
  • What must the driver of a highway route controlled quantity of radioactive material carry, besides the route plan? 49 CFR 397.101(e)
  • What routing document is required before a load of Division 1.1, 1.2 or 1.3 explosives moves? 49 CFR 397.67(d)
  • When must the driver of a placarded vehicle examine its tires? 49 CFR 397.17(a)
  • Which of these must be true of a qualified representative who attends a vehicle in the driver's place? 49 CFR 397.5(d)(2)
  • While a placarded vehicle is being fueled, where must someone be? 49 CFR 397.15(b)
  • Within what distance of a truck loaded with Class 3 flammable liquid is smoking forbidden? 49 CFR 397.13(a)

Emergencies and incident reports 26

  • A cargo tank starts leaking on the road. Apart from getting it off the traveled portion of the highway, what does 49 CFR 177.823 call for? 49 CFR 177.823(b)
  • A carrier discovers a hazardous material in a shipment that was never declared as hazmat. Nothing leaked. Is a written incident report due? 49 CFR 171.16(a)(4)
  • A few drops escape as unloading lines are disconnected in the ordinary way. Is a written incident report due? 49 CFR 171.16(d)
  • A hazmat incident meets the immediate notice rule. Who receives the telephone notice? 49 CFR 171.15(a)
  • A leaking package has been repaired on the road. Where may it be taken? 49 CFR 177.854(d)
  • A loaded hazmat trailer is dropped and left away from any facility. Unless the papers are readily available on it or its identification numbers are visible, what must be marked on the trailer? 49 CFR 172.606(b)
  • A loaded placarded vehicle is taken inside a building for repair. Which condition applies? 49 CFR 177.854(g)(2)
  • A package is found leaking in transit and cannot be safely repaired as it is. How may it be forwarded? 49 CFR 177.854(c)(2)
  • A person is hurt as a direct result of a hazardous material. At what point does the injury bring the immediate notice rule into play? 49 CFR 171.15(b)(1)
  • A specification cargo tank of 1,000 gallons or more suffers structural damage to the part that holds the lading, but nothing leaks. Is a written incident report due? 49 CFR 171.16(a)(3)
  • A truck placarded FLAMMABLE needs a repair to its fuel system. What method is ruled out? 49 CFR 177.854(g)(1)
  • A vehicle carrying hazardous material breaks down on the shoulder. What does the rule ask of the carrier and driver? 49 CFR 177.854(a)
  • After an incident involving a hazardous material, whom must the carrier instruct the driver to contact? 49 CFR 172.606(a)
  • During what period must the emergency response telephone number on a shipping paper be monitored? 49 CFR 172.604(a)(1)
  • The emergency response telephone number on a shipping paper rings an answering machine. Does that meet the rule? 49 CFR 172.604(a)
  • The general public is evacuated because of a hazmat release. How long must the evacuation last before immediate notice is required? 49 CFR 171.15(b)(1)
  • How far may a leaking cargo tank be driven? 49 CFR 177.823(c)
  • How long must a copy of a hazmat incident report be kept? 49 CFR 171.16(b)(3)
  • How soon must the immediate telephone notice of a hazmat incident be given? 49 CFR 171.15(a)
  • No one is hurt and nothing is closed, but the person in possession of the hazmat judges that a situation should be reported. Does the immediate notice rule cover it? 49 CFR 171.15(b)(5)
  • On what form is the written report of a hazmat incident filed, and how soon? 49 CFR 171.16(a)
  • When may a cargo tank that carried Class 3 liquid be repaired by welding? 49 CFR 177.854(h)
  • When must emergency response information be available? 49 CFR 172.600(c)
  • Where does a driver keep the emergency response information in the cab? 49 CFR 172.602(c)(1)
  • Which is an accepted way to present emergency response information? 49 CFR 172.602(b)
  • Which of these must the emergency response information cover? 49 CFR 172.602(a)

Endorsement, TSA and training 32

  • A conviction for an interim disqualifying felony counts against an applicant when it falls within how many years of the application? 49 CFR 1572.103(b)(1)
  • A driver renews a CDL and wants to keep the hazmat endorsement. What does 49 CFR 383.71(d) require? 49 CFR 383.71(d)(3)
  • A driver transfers a CDL to a new State and wants to keep the hazmat endorsement. What must be true of the hazmat test? 49 CFR 383.73(c)(4)
  • A driver with a hazmat endorsement is indicted for a disqualifying felony. How soon must the endorsement be surrendered? 49 CFR 1572.11(b)
  • A driver with a hazmat endorsement moves to a second State partway through the assessment period. When is a new security threat assessment needed? 49 CFR 1572.13(e)
  • A hazmat security plan must address personnel security and unauthorized access. What is the third required element? 49 CFR 172.802(a)
  • A new hazmat employee has not finished training. How may the employee work in the meantime? 49 CFR 172.704(c)(1)
  • A State may issue a hazmat endorsement once TSA has cleared the applicant. What is the other route named in 49 CFR 383.141(b)? 49 CFR 383.141(b)
  • An applicant is under indictment for a listed felony but has not been tried. What is the applicant's status? 49 CFR 1572.103(c)
  • An owner-operator hauls placarded loads in a truck the owner-operator drives. Is that person a hazmat employee? 49 CFR 171.8, Hazmat employee
  • For CDL purposes, which load needs the hazardous materials endorsement? 49 CFR 383.5, Hazardous materials
  • For the mental capacity standard in 49 CFR 1572.109, which of these does NOT count as being committed to a mental health facility? 49 CFR 1572.109
  • How does a CDL endorsement bear on the driver training required by 49 CFR 177.816? 49 CFR 177.816(c)
  • How far ahead of expiration must a State notify the holder of a hazmat endorsement that a security threat assessment is part of renewal? 49 CFR 383.141(c)
  • How long does a hazmat employer keep an employee's training record? 49 CFR 172.704(d)
  • How many hours of theory instruction does the federal hazmat endorsement curriculum require? 49 CFR Part 380, Appendix E
  • How often must a hazmat employee be retrained? 49 CFR 172.704(c)(2)
  • How often must a hazmat security plan be reviewed? 49 CFR 172.802(c)
  • The knowledge for the hazmat endorsement test comes from which parts of Title 49? 49 CFR 383.121
  • May a carrier send out a hazmat load with a driver who has not had hazmat employee training? 49 CFR 177.800(c)
  • Must an applicant be a U.S. citizen to get a hazmat endorsement? 49 CFR 1572.105(a)
  • Several security plan triggers turn on a large bulk quantity. How much is that? 49 CFR 172.800(b)
  • Since February 7, 2022, what must a first-time applicant finish before taking the hazmat knowledge test? 49 CFR 383.71(b)(11)
  • TSA has not finished a renewal assessment by the day a hazmat endorsement expires. What may the State do? 49 CFR 1572.13(c)
  • What does an applicant submit for the TSA security threat assessment, along with the application information? 49 CFR 1572.11(c)(1)
  • What testing does the federal rule require for the hazardous materials endorsement? 49 CFR 383.93(c)(4)
  • Which felony conviction permanently disqualifies a person from holding a hazmat endorsement? 49 CFR 1572.103(a)
  • Which letter on a CDL is the code for the hazardous materials endorsement? 49 CFR 383.153(a)(9)
  • Which load requires the carrier to have a security plan? 49 CFR 172.800(b)
  • Which of these is on the PERMANENT list of disqualifying felonies? 49 CFR 1572.103(a)(6)
  • Which of these is one of the required types of hazmat employee training? 49 CFR 172.704(a)
  • Who is responsible for seeing that a hazmat employee is trained and tested? 49 CFR 172.702

How this list was compiled: Written from the Electronic Code of Federal Regulations, Title 49, Parts 171, 172, 173, 177, 383, 397 and 1572, section 392.10 and Appendix E to Part 380, at https://www.ecfr.gov/current/title-49, text in force on 2026-10-01, checked 2026-10-03. Each question names its section. Licence: Own work. Questions, answer choices and explanations were written for this site from the regulation text; nothing is copied from a state CDL manual, the AAMVA test item pool or another practice test.

How it works

This free unofficial hazmat practice test has 279 questions from the rules behind the H endorsement test, mostly 49 CFR Parts 171 to 173, 177, 397 and 1572, checked 3 October 2026. Emergency Response Guidebook content is left out.

Read the full guide

A hazmat endorsement practice test in ten topics

49 CFR 383.121 lists the knowledge behind the H endorsement test, from the hazmat table and shipping papers to parking, routes and emergencies. Nine topics follow that list and the tenth covers the endorsement and its TSA threat assessment, so this CDL hazmat practice test is written from the regulations alone. The hazmat CDL test has no skills part (383.93).

Check a question, then sit 30

Nobody can name the best hazmat practice test for you, but you can check one: open the source link under any explanation. After a round of ten, More options lists the topics. Then run a practice hazmat CDL test in Exam mode: 30 questions, unmarked until the end, and 80 percent passes (49 CFR 383.135).

  • Placards follow two tables in 172.504: Table 1 at any quantity, Table 2 from 1,001 pounds in non-bulk packages.
  • In 177.848, X means never together, O only where a leak could not mix them, blank no restriction.
  • Misses collect under Missed in More options. Clear my progress, in the same place, deletes what this browser kept.

Questions and answers

How many questions are on the hazmat test?

The CFR gives no count for the H endorsement. 49 CFR 383.133 says each test must contain a set number of questions, and your state agency's CDL page has it. The 30 questions in exam mode are a length chosen for a practice hazmat test.

Is there a free hazmat test questions and answers PDF?

No download, but this free hazmat practice test prints with a separate key. Lists of CDL hazmat test questions and answers age fast: 49 CFR 383.133 makes a quarter of each new version new questions and reorders the responses, so memorized hazmat test answers fail.

Is the DOT hazmat test different from the DMV hazmat test?

No. Both mean the H endorsement knowledge test: 49 CFR 383.121, a U.S. Department of Transportation rule, lists the knowledge, and your state licensing agency gives the test. A DOT hazmat practice test and a DMV hazmat practice test cover the same ground.

Do I retake the CDL hazmat test at renewal?

Yes. Under 49 CFR 383.71(d)(3) a driver who wants to keep the endorsement at renewal passes the knowledge test again and meets the TSA requirements. This bank also works as a practice test for hazmat endorsement renewals.

More tests

Show 8 more

Browse Driving and Transport