Back to results
View all tests
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
  • 0 Incorrect (6 allowed to pass)
  • 0 Correct
Restart
 
 
 
 
 
Advertisement
Back to Program Home
  • Updated for May 2025
  • Based on 2025 OK commercial driver's license manual

Free Oklahoma CDL HazMat Endorsement Practice Test 2025

Oklahoma! Where the wind comes sweepin’ down the plain! If you’ve driven through the state’s gentle plains and prairies, the Ouachita and Ozark Mountains, or the narrow, unpaved, or low-maintenance roads in the rural areas, you’ve likely met the proud people of Oklahoma. Just like the many casts of the musical, Oklahoma’s landscape is diverse, offering challenges and opportunities to drivers who add the Hazardous Materials (Hazmat) endorsement to their Commercial Driver’s License (CDL). This is an amazing way to expand your job opportunities and increase your earning potential! Transporting cargo in Oklahoma comes with challenges, but the rewards offered in this career and the additional opportunities available with the Hazmat endorsement make it worth the effort.

To transport materials the U.S. government has deemed hazardous, you’ll need a Hazmat endorsement. In the Sooner State, hazardous materials transported include petroleum products, crude oil and natural gas, agricultural chemicals, industrial chemicals, and explosives. Some prominent organizations in Oklahoma, such as Devon Energy and Chesapeake Energy in Oklahoma City (oil and natural gas), ONEOK in Tulsa (natural gas), Phillips 66 in Bartlesville (oil refining and energy), Cargill and Simplot (agriculture and food processing), and Linde in Tulsa (distributor of gases and industrial chemicals) rely on Hazmat drivers for transport.

Now that we’ve gotten your attention with the sheer number of opportunities unlocked with this endorsement, let’s look at how to obtain it. First, you must complete a mandatory fingerprinting and background check conducted by the Transportation Security Administration (TSA). The results can take weeks, so get that started and use the wait time to study and practice for the second step: the SOK knowledge test. This test covers federal regulations, substance handling, packaging, quantity limits, and transport configurations for hazardous materials. With a score of 80% on Oklahoma’s 30-question knowledge test, you will pass the test (Oklahoma CDL Handbook 2025).

Oklahoma can use more Hazmat drivers, so we’ve simplified the process for you with Oklahoma SOK Hazmat Endorsement practice tests that present only the information needed, present immediate feedback on wrong responses, and resemble what you will face on the official SOK test. Once you receive your TSA results and feel prepared, you’ll visit the SOK with the necessary documents, pay the fees, and pass the test.

Pass the first time with Premium
OK commercial driver's license
  • Perfect for first-time and renewal CDL/CLP applicants, and those adding endorsements
  • Triple-checked for accuracy

What you need to know

7 min to complete
Available in EN and ES
Verified by Steven Litvintchouk, M.S., Chief Educational Researcher, Member of ACES. See our detailed commitment to accuracy and quality in our practice tests.
Ensuring the accuracy and quality of our program is paramount. Learn more about our rigorous standards in our Commitment to Accuracy article.

What to expect on the actual OK SOK exam

30

questions

24

correct answers to pass

80%

passing score

List of questions (classic view)

  1. What is a technical name?
  2. Do you need to stop before a railroad crossing if you are hauling 100 pounds of Division 4.3 materials?
  3. If you are already carrying 100 pounds of silver cyanide, what precautions must you take if you are given papers at a dock to carry 100 cartons of battery acid?
  4. What is the purpose of a driver placarding his or her vehicle?
  5. Besides the shipping papers and the packages, the other two places where the hazardous material identification number must appear are
  6. Which of the following is NOT an acceptable type of marking for hazardous materials?
  7. Which of the following are necessary qualifications for non-bulk packaging?
  8. What are the major differences between cargo tanks and portable tanks?
  9. Which of the following hazard classes uses a transport index to determine how much of it can be loaded on a single vehicle for transport?
  10. In what location must you keep your shipping papers that describe any hazardous materials?
  11. How often should you check the tires on a placarded trailer that has dual tires?
  12. When shippers package the material, they are trying to
  13. A safe haven is
  14. Which of the following materials are acceptable floor liners for transporting Division 1.1 or 1.2 materials?
  15. What action should you take if you discover your hazardous materials shipment leaking at a rest stop but there is no phone available?
  16. You must NEVER smoke or perform any activity involving fire within 25 feet of
  17. If you are carrying Division 1.2 or 1.3 materials, how far away must you park from a bridge, tunnel, or building?
  18. A placarded vehicle must carry a fire extinguisher with a minimum rating of
  19. If you are carrying Division 1.2 or 1.3 materials, how far away must you park from the traveled portion of the roadway?
  20. Where are the two main places that the hazardous material identification number appears?
  21. Which of the following three hazard classes should NOT be placed into a temperature-controlled trailer (one with a heater/air conditioner unit)?
  22. To determine if you need to use placards, you do NOT need to know
  23. Your engine runs a pump when you are delivering compressed gas. After finishing the delivery, when should you turn off the engine?
  24. Cargo tanks are
  25. The Emergency Response Guidebook (ERG)
  26. A hazard class name or ID number may not be used to describe
  27. If there is an accident involving hazardous materials, who reports it to the proper government agency?
  28. Carriers must give each driver who transports Division 1.1, 1.2, or 1.3 materials
  29. The hazardous material identification numbers must be displayed on portable tanks, cargo tanks, and other bulk packaging. The regulations require black _______ numbers.
  30. A vehicle placarded for hazardous materials must have placards on ____ sides.
Are you in another state?

Your go-to, trusted source

Experience the Driving-Tests difference
Since our foundation in 2010, Driving-Tests.org has led the way in online driver's education, with over a decade of experience. Our dedicated experts, bringing together more than 50 years of collective expertise, have established us as the largest non-governmental organization in the U.S. solely focused on driver education. We go beyond the official manuals, offering unique interactive experiences and support like audio guides and an AI Assistant, to cater to different learning styles and needs.
Helping hundreds of thousands to ace their tests, our resources have earned a 4.7-star rating from over 14,500 reviews. Our goal is to make your path to becoming a confident driver as straightforward and effective as possible.
 (6  allowed to pass)
Restart test
Ask AI Coach
Ask DMV Genie AI
new
    Calculating your test results Your test results are ready
    Pass Your CDL Exam the First Time - Guaranteed

    Before you see your results, discover how CDL Premium helps you:

    • Real CDL Exam-Like Oklahoma Questions
      Questions match official CDL tests
    • Official FMCSA-approved
      ELDT Certification included
    • 99.06% Verified Pass Rate vs. 49% Average
      Proven success, specialized for CDL drivers

    Trusted by 1.15 Million drivers

    Secure Your CDL & ELDT Certification Continue to my results
    Opens in a new tab — your results are saved
    Try Driving-Tests Premium

    Pass the knowledge test the first time, guaranteed.