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Free practice test · 300 original questions
CDL General Knowledge practice test
Commercial driver general knowledge practice built from the federal FMCSA knowledge-test requirements.
- Multiple-choice knowledge test
- 80% to pass (49 CFR 383.135)
- item count set by your state
- No signup to start
- Every answer includes a source note
- Updated September 22, 2026
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What is the "four-second rule" used for in CMV driving?
20 free questions with explanations · full bank $8.99, once
- 300
- practice questions
- 20
- free, no signup
- 80%
- published threshold
- 50
- benchmark questions
Topic coverage
Topics covered in this bank
300 original questions mapped to the listed source topics. Bars show how many questions each topic gets.
Questions written from the federal CDL knowledge-test requirements in 49 CFR Part 383 and the required subject areas; not official state test questions.
Study plan
How to pass the CDL General Knowledge
The order that works: learn the rules, drill until they’re automatic, then use the benchmark to check consistency.
- 1
Learn the pre-trip inspection in a fixed order so nothing is skipped under pressure
- 2
Drill air brakes, combination vehicles, and space management — the highest-yield sections
- 3
Know the disqualification and out-of-service rules, including alcohol and drug thresholds
- 4
Review cargo securement, weight limits, and hazardous materials basics
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- 20 original questions with source notes
- Instant scoring
- Free account adds saved progress + mistake review
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- All 300 questions, every topic
- 50-question timed benchmark; see the score note below
- Saved mistake review, ad-free
80% is the federal threshold in 49 CFR 383.135. The regulation sets the percentage only — your state driver licensing agency sets how many questions the test has.
About these questions
Written by QuizCram from the official source and verified against its text — never copied from a real exam. Questions written from the federal CDL knowledge-test requirements in 49 CFR Part 383 and the required subject areas; not official state test questions.
- Questions last updated
- September 22, 2026
- Bank version
- v10 · 300 questions
- Free to read
- 20 questions with answers
Good to know
CDL General Knowledge FAQ
Federal rules set the 80% passing threshold but not a question count. Each state writes its own test — 50 questions is common for General Knowledge, so confirm with your state agency.
No. This bank covers General Knowledge. Air brakes, combination vehicles, tanker, and hazmat endorsements are separate state tests.
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