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Missouri CDL practice test

Getting a commercial driver's licence in Missouri starts with the CDL knowledge tests. The content is federal: every state, Missouri included, writes its tests from the FMCSA CDL manual, so the general knowledge test has 50 questions, the endorsement tests have 20 to 30, and the passing score is 80% on each. The Missouri driver licensing agency administers the test; the rules behind it are published by the FMCSA. Try the free Missouri CDL practice questions below, then pick a full test.

Free Missouri CDL practice questions

Five questions from the general knowledge, air brakes and combination vehicles banks, the three tests most Missouri Class A applicants take first. Show the answer to read the explanation.

  1. When using a fire extinguisher, you should aim it at:

    • The top of the flames
    • The base of the fire, staying as far away as possible and upwind
    • The smoke above the fire
    • The ground in front of you to make a barrier
    Show answer
    Answer: B. The base of the fire, staying as far away as possible and upwind

    The extinguishing agent must reach the burning material, not the flames above it. Stay upwind so the agent reaches the fire and the heat and smoke move away from you, and keep spraying until whatever was burning is cool.

    Source: FMCSA CDL Manual, Section 2.20.2 (Extinguishing the Fire)

  2. Which type of fire should you put out with a lot of water?

    • A gasoline fire
    • An electrical fire
    • A tire fire
    • A diesel fuel fire
    Show answer
    Answer: C. A tire fire

    Tire fires need lots of water to cool the rubber. Water spreads burning fuel and conducts electricity, so never use it on gasoline, diesel, or electrical fires.

    Source: FMCSA CDL Manual, Section 2.20.2 (Extinguishing the Fire)

  3. A CDL driver found operating a commercial vehicle with any detectable amount of alcohol below 0.04% BAC will be:

    • Given a warning only
    • Fined but allowed to keep driving
    • Disqualified for one year
    • Placed out of service for 24 hours
    Show answer
    Answer: D. Placed out of service for 24 hours

    Even under the 0.04% limit, any detectable alcohol puts you out of service for 24 hours. At 0.04% or more you lose your CDL for at least a year on the first offense.

    Source: FMCSA CDL Manual, Section 2.21 (Alcohol and Driving)

  4. The only thing that sobers you up after drinking is:

    • Time
    • Black coffee
    • A cold shower
    • Fresh air and exercise
    Show answer
    Answer: A. Time

    The liver removes alcohol at a fixed rate of about one drink per hour. Coffee, cold showers, and exercise might make you feel more awake, but they do nothing to lower your blood alcohol level.

    Source: FMCSA CDL Manual, Section 2.21.1 (How Alcohol Works)

  5. A 12-ounce beer, a 5-ounce glass of wine, and a 1.5-ounce shot of liquor:

    • Contain very different amounts, with beer the weakest
    • All contain about the same amount of alcohol
    • Are safe to drink before driving if you eat first
    • Count as one drink only if consumed together
    Show answer
    Answer: B. All contain about the same amount of alcohol

    Each is one standard drink with roughly the same amount of pure alcohol. The type of drink does not matter; the number of drinks and the time since drinking determine your blood alcohol concentration.

    Source: FMCSA CDL Manual, Section 2.21.1 (How Alcohol Works)

Every CDL test for Missouri drivers

Each page has ten free sample questions, the real question count, the 80% pass mark and what the test covers.

How the Missouri CDL knowledge test works

You take the general knowledge test first; it is required for every CDL class. Class A drivers add the combination vehicles test. Almost everyone takes the air brakes test, because skipping it puts an air brake restriction on the licence. Endorsements (hazmat, tanker, doubles/triples, passenger, school bus) each have their own knowledge test. Pass the tests and you hold a commercial learner's permit; the skills test in a truck comes later.

Fees, appointment rules and test centre locations are set by Missouri and change over time, so check the state driver licensing agency before you go. What does not change is the content, and that is what PassRig drills.

Missouri CDL test questions

How many questions are on the Missouri CDL test?

The Missouri CDL general knowledge test follows the federal model: 50 questions, 40 correct to pass. Endorsement tests are shorter: air brakes 25, hazmat 30, and combination vehicles, tanker, doubles/triples, passenger and school bus 20 each.

What is the passing score on the Missouri CDL permit test?

80% on every knowledge test, the same pass mark used across the United States.

Where do I take the CDL knowledge test in Missouri?

At the Missouri state driver licensing agency (the DMV, DOT or equivalent). Check its website for locations, appointments and current fees; the test content itself comes from the FMCSA CDL manual.

Does PassRig have Missouri CDL practice questions?

Yes. Pick Missouri in the app and you get practice sets and mock exams built from the knowledge test content your state uses, with the real counts and the 80% line.

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