How Many Questions Are on the Arizona CDL General Knowledge Test?
Arizona's CDL general knowledge test has 50 multiple-choice questions, and you need to answer at least 40 of them correctly (80%) to pass. This format is set by federal rule and matches nearly every other state, including Arizona.
The official test format
The CDL general knowledge test's length and passing score are set by federal regulation (49 CFR Part 383), which is why Arizona's format matches most other states exactly.
Arizona splits CDL testing across two locations: the knowledge test can be taken at any MVD office, while the skills/road test is specifically administered at a CDL office.
The test covers commercial driving fundamentals common to nearly every CDL applicant nationwide, including vehicle inspection, air brakes, cargo securement, and hours-of-service rules.
How the questions are distributed by topic
The official test draws from a broad, federally-defined set of topics rather than any single area, which is why understanding the reasoning behind a rule matters more than memorizing an isolated fact.
Our free Arizona CDL practice tests cover 18 topic areas, including hours-of-service, cargo securement, and air brakes, so you can see which areas need more review.
How our practice tests are structured
Rather than mirroring the exact 50-question format, dmvwrittenexam.com splits its 100+ original Arizona CDL questions into multiple practice tests, giving you more total repetitions across more topics than one official-length test would.
Each question includes an explanation and a source reference, so you learn why an answer is correct instead of memorizing a letter.
Frequently Asked Questions
Is the Arizona CDL test the same length as in other states?
Yes, generally. The CDL general knowledge test's 50-question, 80%-passing format is set by federal rule and is consistent across nearly every state, including Arizona.
Do I take the knowledge test and skills test at the same place?
No — the knowledge test can be taken at any Arizona MVD office, while the skills/road test is administered specifically at a CDL office.
What happens if I don't pass?
Retake policies are set by the MVD and can vary. Arizona's CLP is valid for 12 months, so plan any retakes within that window.
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Start a free Arizona cdl practice testLast reviewed: 2026-07-20