Iowa DMV CDL General Knowledge Quick Practice Test 1

Iowa DMV CDL General Knowledge Quick Practice Test 1 For 2025

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. The front of an enclosed trailer should:

Be swept clean.
Contain rags.
Not be used for cargo.
Be free of cracks.

3. A driver can have:

Two licenses, one for automobiles and one for trucks.
Only one license.
A license for each state in which they plan to drive.
An automobile license from one state and a CDL from another.

4. An emergency brake must be controlled by:

Mechanical force.
Air pressure.
Gravity.

5. Using a helper when backing up a large vehicle is:

Encouraged.
Discouraged.
Illegal.

6. A vehicle that is smaller than your vehicle:

Will usually be able to stop faster than your vehicle.
Will usually take more time to stop than your vehicle.
Will take about the same amount of time to stop as your vehicle.

7. 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.

8. Intrastate carriers must have what information displayed on both sides of their vehicle?

The permit number
The model number of truck
The maximum weight allowed
The destination

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