CDL General Knowledge

Practice questions
Learn by topic with instant explanations. Free, no signup.
Full timed mock exam
A 50-question, 60-minute simulation to test your readiness.

Free practice for the CDL General Knowledge exam. Original questions covering the official content areas — with a full timed mock exam.

The CDL General Knowledge written test is commonly about 50 multiple-choice questions and requires at least 80% correct to pass — the 80% pass mark is set federally under 49 CFR §383.135, while the exact question count varies by state.

The CDL General Knowledge exam is about 50 questions, 80% to pass. Practice by topic here, then take the full timed mock exam to gauge your readiness. Free, no signup.

What the CDL General Knowledge exam covers

27%
Safe Driving
23%
Vehicle Inspection
18%
Control & Operation
17%
Emergencies & Hazards
15%
Regulations & Health
Study guide →Browse all questions →

Helpful resources

Find your state's DMV CDL page →
Recommended prep — books & tools
  • Barron's CDL: Commercial Driver's License Test

    Trusted prep brand covering the CDL general-knowledge test.

    See it on Amazon →

This section contains affiliate links. As an Amazon Associate, PrepPass earns from qualifying purchases. We may earn a commission if you buy through these links, at no extra cost to you.

Frequently asked questions

Is PrepPass's CDL General Knowledge practice free?

Yes — every CDL General Knowledge practice question, study guide, and lesson on PrepPass is free. A full timed mock exam is also included at no cost.

How many CDL General Knowledge practice questions does PrepPass have?

PrepPass currently has 120 original CDL General Knowledge practice questions across 5 topic areas, and every question comes with a written answer explanation.

What languages is PrepPass's CDL General Knowledge prep available in?

English, 中文 (Chinese), Español (Spanish), and Tiếng Việt (Vietnamese).

How are PrepPass's CDL General Knowledge questions written?

They are original questions written by PrepPass from public-domain statutes and official exam blueprints — never copied from the real exam. Read our question methodology →

Is PrepPass affiliated with the licensing board or exam provider?

No. PrepPass is an independent study resource and is not affiliated with, endorsed by, or connected to any licensing board or official exam provider.

Can I practice CDL General Knowledge on my phone?

Yes — PrepPass runs in any mobile or desktop web browser, with no app to download.

Own the complete CDL General Knowledge guide — PDF + EPUB, $9.99 →

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