Question 1
You may not consume alcohol within ____ of going on duty.
Correct Answer:
Four hours
Question 2
A tread depth of ____ should be in every major groove of a tire that is not in the front of a commercial motor vehicle.
Correct Answer:
2/32 of an inch
Question 3
Why do large vehicles use air brakes?
Correct Answer:
Air brakes are very effective systems.
Question 4
When backing with a trailer, you should begin by:
Correct Answer:
Turning the steering wheel in the direction opposite of the turn.
Question 5
While driving downhill, you should brake until you reach a speed that is ____ below your safe speed, then release the brake pedal.
Correct Answer:
5 mph
Question 1 of 50
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About this Exam

Prepare with the California CDL Class B Knowledge Test 1 practice quiz. This question bank includes 50 questions covering vehicle, driving, brake, driver, and trailer. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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California CDL Class B Knowledge Test 1

This practice set contains 50 questions from the matching question bank and focuses on vehicle, driving, brake, driver, and trailer. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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