Idaho DMV CDL General Knowledge Quick Practice Test 1

Idaho 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. After starting the engine, the Anti-Lock Braking System (ABS) light stays on if:

The ABS is working properly.
The ABS is not working properly.
The ABS is not engaged.

2. Most drivers are the least alert:

In the morning.
In cold weather.
At night.
After work.

3. You should not use the parking brake:

If your vehicle is stopped on a level surface.
If your vehicle is stopped on a slight incline.
If your vehicle's brakes are very hot.
If your vehicle's other braking systems seem to be working adequately.

4. What color are ABS malfunction lamps?

Orange
Yellow
Green
Blue

5. Air tank drains should:

Not be used by the driver.
Only be used when it is wet outside.
Be used to drain the tanks completely.

6. An open automobile window in cold weather may indicate that the driver is:

Driving impaired.
Inappropriately dressed.
Using the heat inside their vehicle.
Enjoying the fresh air.

7. A truck may need to be under the legal maximum weight limit when being driven:

On a flat road.
On a mountainous road.
In heavy traffic.
At night.

8. You should specifically look out for black ice:

When it is snowing.
When the temperature is below freezing and the road looks wet.
When the temperature is above freezing and there is snow on the ground.

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