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. What color are ABS malfunction lamps?

Orange
Yellow
Green
Blue

2. On a wet road, you should reduce your speed:

By about one-half.
By about one-third.
By about one-quarter.
By about one-eighth.

3. When checking the air and electrical lines during a vehicle inspection, all of the following should be true, except:

The air hoses are making a hissing noise.
The air hoses and electrical lines are not cut.
The air lines are not pinched.
The air lines are not dragging against tractor parts.

4. You should check and adjust your mirrors:

Before driving.
While driving.
After driving.

5. When starting your vehicle, the coolant temperature should:

Not change.
Increase gradually.
Quickly jump from low to high.

6. If an aggressive driver is involved in a crash on the road ahead of you, you should:

Block the driver in with your vehicle.
Stop after the crash scene and report the driver’s aggressive behavior to the police.
Continue driving and mind your own business.
Pull over and yell at the driver.

7. 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.

8. 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.

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