Iowa DMV CDL General Knowledge Quick Practice Test 1

Iowa DMV CDL General Knowledge Quick Practice Test 1 For 2026

CDL Class A, B or C. Complete CDL driver training course. All the questions in this test are from the official DMV written exam. You can use our free online tests to evaluate how likely you are to pass the official DMV test. Or you can just cut to the chase and increase your chances of passing by upgrading to Premium Membership and unlock official DMV tests. In addition, you will also receive a master cheat sheet which contains all your state’s DMV questions and answers. Premium membership also unlocks a smart tracker which keeps an inventory of all incorrectly answered questions for easy, fast and effective revision. Practice with our free tests or hit Upgrade button below for premium access and increase your chances of passing your DMV written exam.

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Quick Facts:

Number of Questions – 20

Passing Percentage – 80%

Test Type – Free Test

1. During the vehicle inspection test, you will be asked to:

Change a tire.
Explain to the examiner what you would inspect and why.
Estimate the weight of a load in a trailer.
Change a windshield wiper.

2. When taking the basic vehicle control skills test:

Points are deducted for each pull-up.
A driver is allowed three pull-ups per maneuver.
A pull-up will earn points only if the driver gets out of the vehicle before pulling up.
Only an excessive number of pull-ups will be counted as errors.

3. When checking the exhaust system, it should be:

Loose.
Leaking.
Fastened securely.
Cracked.

4. After a tire has been changed, the driver should stop after a short distance to:

Check the tightness of the lug nuts.
Ensure that the tire tread depth is good.
Ensure that the correct tire was changed.
See if rocks have gotten into the tread.

5. If confronted by an aggressive driver, you should:

Stay in their path.
Make eye contact with the driver.
Make gestures at the driver.
Report the driver.

6. You will often have to drive your vehicle under bridges and overpasses. If approaching such an opening, you should:

Assume the posted clearance height is accurate.
Assume the posted clearance height is inaccurate.
Measure the height of the opening before proceeding.

7. What is the legal length limit for double-trailer combinations?

34 feet
53 feet
61 feet

8. When are people usually the least alert?

In the morning
In the early evening
Late at night

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