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. Missouri Department of Revenue, Driver License Bureau 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.

50general knowledge questions
80%passing score on every test
8knowledge tests covered
MOpick your state once in the app

Free Missouri CDL practice quiz

Five questions from the general knowledge, air brakes and combination vehicles banks, the three tests most Missouri Class A applicants take first. Tap an answer to see if you were right and read the explanation.

0 of 5 right0 of 5 answered

When using a fire extinguisher, you should aim it at:
Which type of fire should you put out with a lot of water?
A CDL driver found operating a commercial vehicle with any detectable amount of alcohol below 0.04% BAC will be:
The only thing that sobers you up after drinking is:
A 12-ounce beer, a 5-ounce glass of wine, and a 1.5-ounce shot of liquor:

Every CDL test for Missouri drivers

Each page has a free ten-question quiz, 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; the current ones from Missouri DOR are in the next section. What does not change is the content, and that is what PassRig drills.

Missouri CDL fees and rules

In Missouri the CDL is issued by the Missouri Department of Revenue, Driver License Bureau. The figures below are taken from its own pages and were last checked on 2 November 2026. Fees and rules change, so confirm with the agency before you go.

Study from the state's own book: Missouri Commercial Driver License Manual. PassRig's questions are written from the same FMCSA manual it is based on.

What	MO	Source
Learner's permit fee	$44.00, including $25 written exam, $10 permit and $9 processing fees	dor.mo.gov
CDL fee	About $83, including $25 skills test, $40 licence (3-6 year term) and $18 processing fees	dor.mo.gov
Knowledge test fee	$25 written examination fee, included in the $44.00 CLP fee	dor.mo.gov
Permit valid for	360 days, non-renewable	dor.mo.gov
Minimum age	18 for intrastate driving (until age 21); 21 for interstate	dor.mo.gov
Appointment	Skills test by appointment only at Missouri State Highway Patrol CDL test sites	dor.mo.gov
If you fail	May retake immediately, though the examiner may require you to return for a retake later	dor.mo.gov
Test languages	English only; no translators allowed for the knowledge test	dor.mo.gov
Medical certificate	DOT Medical Examiner's Certificate needed before a CLP or CDL is issued (non-exempted interstate/intrastate)	dor.mo.gov
Entry-level driver training	ELDT must be completed before taking the skills test for a CDL or any endorsement	dor.mo.gov
Also worth knowing	CLP must be held at least 14 days before the skills test	dor.mo.gov

4 official pages from Missouri DOR were read for this section. Nothing on it is estimated.

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?

Missouri Department of Revenue, Driver License Bureau gives the test. Skills test by appointment only at Missouri State Highway Patrol CDL test sites The test content itself comes from the FMCSA CDL manual.

How much does a CDL permit cost in Missouri?

Missouri DOR lists the commercial learner's permit fee as $44.00, including $25 written exam, $10 permit and $9 processing fees. If you fail a knowledge test: May retake immediately, though the examiner may require you to return for a retake later

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.