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Missouri CDL Hazardous Materials Practice Test

The Missouri CDL Hazardous Materials test is a multiple-choice knowledge test you take for your commercial learner's permit. Missouri Department of Revenue (licenses) and Missouri State Highway Patrol (testing) says you need 80% to pass (source).

Last updated Oct 7, 2026. FirstTry CDL is a CDL permit test prep site by Hive Asset Group, LLC.

Scott Wilder, editor at FirstTry CDL

By Scott Wilder, Editor

Last reviewed against the Missouri CDL manual on October 7, 2026

Scott Wilder on X | scottwilderhq.com

FirstTry CDL is a CDL permit test prep site by Hive Asset Group, LLC. It offers free exam-style practice tests built from the official CDL manual. FirstTry CDL is not affiliated with any DMV, FMCSA or government agency. Practice questions are exam-style questions built from the official CDL manual, not actual test questions.

Missouri CDL permit facts

WhatWhat Missouri saysSource
Hazardous Materials pass mark80%Official page
Hazardous Materials test questions30Official page
CLP fee$44, which is a $25 written test fee, a $10 permit fee and a $9 office fee. Pay by card, check or cashOfficial page
Duplicate CLP fee$14Official page
CLP validity360 days. It cannot be renewed. When it ends you must pass all the knowledge tests again for a new CLPOfficial page
CLP holding periodHold the CLP at least 14 days before the CDL skills test. The test paper alone is not a permitOfficial page
Knowledge test retest ruleYou may retake a failed test right away, but the examiner can make you come back on a later dayOfficial page
Test languagesCommercial knowledge tests are English only, and no translators are allowed (RSMo 302.720).Official page

20 question Hazardous Materials practice test

  1. 1. A placarded vehicle with no explosives is parked. How far must it be from an open fire?

    1. A. At least 50 feet
    2. B. At least 300 feet
    3. C. At least 100 feet
    4. D. At least 25 feet
    Show answer

    Answer: B. At least 300 feet

    Do not park within 300 feet of an open fire.

    From the official CDL manual, section 9.6.2.

  2. 2. Where is the transport index of a radioactive package printed?

    1. A. On the fuel cap
    2. B. On the package label
    3. C. On the driver's license
    4. D. On the trailer tires
    Show answer

    Answer: B. On the package label

    The shipper prints the transport index on the label.

    From the official CDL manual, section 9.4.1.

  3. 3. In Table 9.3, what is the reportable quantity for phorate?

    1. A. 100 pounds
    2. B. 5,000 pounds
    3. C. 10 pounds
    4. D. 1 pound
    Show answer

    Answer: C. 10 pounds

    Table 9.3 lists phorate at 10 pounds (4.54 kilograms).

    From the official CDL manual, section 9.3.3 Lists of Regulated Products.

  4. 4. You see that a package is leaking while you load. What should you do?

    1. A. Load it last
    2. B. Refuse the package
    3. C. Wipe it and load it
    4. D. Load it in the sleeper
    Show answer

    Answer: B. Refuse the package

    Drivers must refuse leaking packages and shipments.

    From the official CDL manual, section 9.2.3 The Driver.

  5. 5. Which party sends products from one place to another by truck, rail, vessel, or airplane?

    1. A. The driver
    2. B. The shipper
    3. C. The inspector
    4. D. The carrier
    Show answer

    Answer: B. The shipper

    The manual says the shipper sends the products.

    From the official CDL manual, section 9.2.1.

  6. 6. What do the arrows on a package with liquid containers inside show?

    1. A. Which end to open
    2. B. Where to stack
    3. C. Which way is up
    4. D. Which way to load first
    Show answer

    Answer: C. Which way is up

    Orientation arrows point in the correct upright direction.

    From the official CDL manual, section 9.3.7 Package Markings and Labels.

  7. 7. Which placard goes with Class 3 Flammable Liquids?

    1. A. Combustible
    2. B. Flammable
    3. C. Flammable Solid
    4. D. Flammable Gas
    Show answer

    Answer: B. Flammable

    The Table B row for 3 Flammable Liquids says Flammable.

    From the official CDL manual, section 9.3.11 Placard Tables.

  8. 8. Which action is forbidden around a hazardous materials leak or spill?

    1. A. Warning other people
    2. B. Smoking
    3. C. Keeping the shipping papers
    4. D. Staying upwind
    Show answer

    Answer: B. Smoking

    Never eat, drink, or smoke around a leak or spill.

    From the official CDL manual, section 9.7.3 Fires.

  9. 9. Radioactive material spilled in your trailer. When may you use the vehicle again?

    1. A. After a day of airing out
    2. B. After it is cleaned and checked with a survey meter
    3. C. After you wash your hands
    4. D. After the shipping papers are signed
    Show answer

    Answer: B. After it is cleaned and checked with a survey meter

    Do not use the vehicle until it is cleaned and checked with a survey meter.

    From the official CDL manual, section 9.7.4 Responses to Specific Hazards.

  10. 10. A driver wants to skip a hazmat rule to save time. What does the manual say?

    1. A. It is fine if the load is small
    2. B. It is fine on a short trip
    3. C. It is fine if no one is watching
    4. D. Breaking rules is unsafe
    Show answer

    Answer: D. Breaking rules is unsafe

    Taking shortcuts by breaking rules is unsafe.

    From the official CDL manual, section 9.1.3.

  11. 11. Battery fluid is an example of which hazard class?

    1. A. Class 3, Flammable Liquids
    2. B. Class 7, Radioactive
    3. C. Class 6, Poison
    4. D. Class 8, Corrosives
    Show answer

    Answer: D. Class 8, Corrosives

    Table 9.1 lists battery fluid under Class 8 Corrosives.

    From the official CDL manual, section 9.3.1 Definitions.

  12. 12. Ammonium nitrate and hydrogen peroxide are examples of which hazard class?

    1. A. Class 3, Flammable
    2. B. Class 4, Flammable Solids
    3. C. Class 6, Poisons
    4. D. Class 5, Oxidizers
    Show answer

    Answer: D. Class 5, Oxidizers

    Table 9.8 lists ammonium nitrate and hydrogen peroxide as Class 5, Oxidizers.

    From the official CDL manual, section 9.7.5 Classes of Hazardous Materials (Table 9.8).

  13. 13. Who must choose the safest route for placarded radioactive materials?

    1. A. The carrier
    2. B. The shipper
    3. C. The consignee
    Show answer

    Answer: A. The carrier

    A carrier must choose the safest route, then tell the driver about the materials and show the route plan.

    From the official CDL manual, section 9.6.5.

  14. 14. One tire on your hazmat truck is leaking. How far may you drive on it?

    1. A. Only to the nearest safe place to fix it
    2. B. To the next planned stop
    3. C. To the delivery, if it is near
    Show answer

    Answer: A. Only to the nearest safe place to fix it

    Do not drive on a leaking or flat tire except to the nearest safe place to fix it.

    From the official CDL manual, section 9.6.9.

  15. 15. Which case does the manual list as an exception to the shipper's certification on the shipping paper?

    1. A. The trip is short
    2. B. The load is not placarded
    3. C. You pull cargo tanks supplied by you or your employer
    4. D. The load is small
    Show answer

    Answer: C. You pull cargo tanks supplied by you or your employer

    The manual says certification is not needed when you are pulling cargo tanks supplied by you or your employer.

    From the official CDL manual, section 9.2.1.

  16. 16. How close must the person watching a cargo tank be during loading or unloading?

    1. A. Within 10 feet
    2. B. Within 25 feet
    3. C. Within 50 feet
    4. D. Within 100 feet
    Show answer

    Answer: B. Within 25 feet

    The person must be within 25 feet of the tank.

    From the official CDL manual, section 9.5.2 Tank Loading.

  17. 17. Which job belongs to the shipper?

    1. A. Refusing leaking packages
    2. B. Supplying placards
    3. C. Reporting accidents to the government agency
    4. D. Keeping papers on the driver's seat
    Show answer

    Answer: B. Supplying placards

    The shipper must package, mark, label, prepare papers, give emergency information, and supply placards.

    From the official CDL manual, section 9.2.1 The Shipper.

  18. 18. What are the rules for packaging, loading, and unloading hazmat called?

    1. A. Containment rules
    2. B. Placard rules
    3. C. Routing rules
    4. D. Endorsement rules
    Show answer

    Answer: A. Containment rules

    The manual calls them containment rules.

    From the official CDL manual, section 9.1.1.

  19. 19. Who pays for cleanup of roads and ditches after a leak from your vehicle?

    1. A. The state
    2. B. The carrier
    3. C. The shipper's customer
    4. D. The local fire department
    Show answer

    Answer: B. The carrier

    The carrier pays for the cleanup of contaminated parking lots, roadways, and drainage ditches.

    From the official CDL manual, section 9.7.3 Fires.

  20. 20. Which result of a hazardous materials incident requires you or your employer to make a phone report?

    1. A. A person needs a bandage
    2. B. A person needs hospitalization
    3. C. A person feels tired
    4. D. A person leaves the scene
    Show answer

    Answer: B. A person needs hospitalization

    A report is required when an injured person requires hospitalization.

    From the official CDL manual, section 9.7.5 Required Notification.

Missouri CDL Hazardous Materials questions

What score do you need to pass the Missouri CDL Hazardous Materials test?

Missouri says you need 80% to pass the Hazardous Materials test.

Is the Missouri CDL Hazardous Materials test the same as other states?

The Hazardous Materials test is built on the same federal knowledge standards in every state, so the topics match the CDL manual. Missouri uses its own handbook: https://dor.mo.gov/forms/Commerical_Driver_License.pdf

How much does a CDL permit cost in Missouri?

CLP fee: $44, which is a $25 written test fee, a $10 permit fee and a $9 office fee. Pay by card, check or cash.

What languages is the Missouri CDL knowledge test offered in?

Commercial knowledge tests are English only, and no translators are allowed (RSMo 302.720).

Sources

Hazardous Materials practice test in nearby states

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