Free CDL General Knowledge Test Practice Test
Realistic 50-question practice exam with instant feedback and score reports.
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About this practice exam
Free CDL General Knowledge Test practice test with 50 realistic multiple-choice questions, instant grading, and explanations. Study with drill mode, category score reports, and a personalized review plan.
Exam format
- 50 multiple-choice practice questions
- Drill mode with instant feedback and explanations after each answer
- Category score reports every 15 questions
What's on the exam
This practice test mirrors the weighted categories on the real CDL General exam:
| Category | Weight |
|---|---|
| Vehicle Inspection | 18% |
| Basic Vehicle Control | 16% |
| Speed and Space Management | 16% |
| Driving in Various Conditions | 16% |
| Seeing and Communicating | 12% |
| Hazardous Materials Awareness | 10% |
| Emergencies and Special Situations | 12% |
Study tips
- Review the official exam content outline before your first practice run.
- Take the full practice exam once to establish a baseline score by category.
- Focus review on categories where you score below the passing threshold.
- Re-take missed questions in drill mode until you can explain each correct answer.
- Schedule the real exam only after consistent passing scores on practice tests.
Sample CDL General practice questions
Try a few representative questions below. Each includes the correct answer and a short explanation — the same style you'll see in the full practice test.
- Question 1General Knowledge
Why should you increase your following distance when driving a heavily loaded commercial vehicle?
- A.Heavier vehicles require longer stopping distances(Correct)
- B.It improves fuel economy on downhill grades
- C.Federal law requires 10 seconds in all conditions
- D.It prevents trailer sway at parking speeds only
Explanation
Mass increases momentum and braking distance. CDL general knowledge emphasizes adjusting space management for weight, speed, and road conditions.
- Question 2Safety
Before each trip, a CDL driver must ensure cargo is:
- A.Loaded only on the passenger side for balance
- B.Properly secured and within legal weight limits(Correct)
- C.Covered with a tarp regardless of material type
- D.Distributed so the trailer is always heavier than the tractor
Explanation
Pre-trip inspection includes securement and weight compliance. Improperly secured or overweight cargo is a leading cause of crashes and violations.
- Question 3Air Brakes
During an air brake system check, a low air pressure warning must activate before pressure falls below:
- A.80 psi
- B.60 psi(Correct)
- C.40 psi
- D.20 psi
Explanation
CDL air brake tests expect knowledge that warnings must come on before 60 psi in a typical dual system — giving the driver time to stop safely.
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Frequently asked questions
How many questions are on this CDL General practice test?
This practice test includes 50 multiple-choice questions designed to mirror the format and difficulty of the real CDL General Knowledge Test.
Is this CDL General practice test free?
Yes. You can start practicing for free. Create an account to save progress, track weak categories, and retake the exam.
Do I get explanations after each question?
Yes. In drill mode you see why the correct answer is right, why distractors are wrong, and practical examples where relevant.
How should I use this practice test to prepare?
Take the full exam under timed conditions, review missed questions by category, then focus study on your weakest sections before scheduling the real exam.
Does this replace official exam materials?
No. Use this as a supplement alongside official candidate information bulletins, textbooks, and hands-on experience required for your license or certification.
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