Free Iowa CDL Permit Practice Test: General Knowledge 2025
- Perfect for first-time and renewal CDL/CLP applicants, and those adding endorsements
In the United States, there are three main classes of Commercial Driver’s Licenses (CDLs). A Class A CDL allows you to operate a combination vehicle with a gross combination weight rating (GCWR) of 26,001 pounds or more, provided the towed vehicle(s) has a gross vehicle weight rating (GVWR) of more than 10,000 pounds. This class of CDL is typically for operating semi-trucks and tractor-trailers. A Class B CDL allows you to operate a single vehicle with a GVWR of 26,001 pounds or more or a combination vehicle where the towed vehicle has a GVWR of 10,000 pounds or less. This class of CDL is typically for operating large buses and straight trucks, including box trucks and most dump trucks. A Class C CDL allows you to operate other kinds of commercial vehicles that transport hazardous materials or at least 16 occupants (including the driver). This class of CDL is typically for operating small buses (including shuttle buses) or small trucks carrying hazardous materials.
No matter which class of CDL you plan to get, you must meet a series of requirements. For one, you must pass an official skills test, which includes basic vehicle maneuvers, a pre-trip inspection, and a road test. To be sure of passing the skills test, you must practice commercial driving under supervision until you’re proficient. And to be allowed to practice commercial driving, you must hold a Commercial Learner’s Permit (CLP).
To obtain a CLP, you must also meet certain requirements, including passing the official General Knowledge test on the basic theory of commercial driving. The questions on this test are based on the official Iowa National CDL Manual (Iowa CDL Handbook 2025). You should read the manual a couple of times to learn as much as you can from it. But if you’ve found it tough to learn enough information from the manual, you probably need some more help.
This free Iowa CDL permit practice test is based on the official CDL manual, just like the official knowledge test. It’s up to date as of October, 2025. There are 50 multiple-choice practice questions on such topics as basic maneuvers, cargo management, emergency preparedness, and pre-trip inspections. Our automated assistant can give you a hint if you get stuck or an explanation of the correct answer if you still miss the question. There’s no time limit; take all the time you need to learn and master the material covered by this practice test.
Be sure to try our other CDL General Knowledge practice tests too.
FAQs
How can you get yours?
To obtain a CDL license in Iowa, first get a commercial learner’s permit (CLP) by passing the required knowledge tests. Hold the CLP for at least 14 days before taking the skills test. Complete CDL training (recommended) and pass the skills test. Ensure you meet all medical and legal requirements.
What is the associated cost?
The cost for a CDL in Iowa includes a $12 fee for the CLP and a $16 fee for the CDL license. Additional costs may apply for skills testing and CDL training programs.
How long does training last?
CDL training duration in Iowa varies by program. Full-time training typically ranges from a few weeks to several months, depending on the school and the specific program.
What can disqualify you from being eligible?
In Iowa, disqualifications from obtaining a CDL include serious traffic violations such as DUIs, reckless driving, criminal convictions involving motor vehicles, and failing the medical examination required for CDL holders.
How long does the test take?
The Iowa CDL permit test duration varies based on the applicant’s preparedness and test-taking pace. The general knowledge test, which is part of the permit test, typically consists of 50 questions.
Verified for accuracy: October 2025
Reviewed by Steven Litvintchouk, M.S.
Chief Educational Researcher (ACES member)
Methodology & Editorial Policy
What to expect on the actual IA exam
questions
correct answers to pass
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