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The CDL general knowledge test is required to be taken by all CDL applicants. The Idaho CDL test consists of 50 questions. To pass, you must correctly answer at least 40 questions (80%). The general knowledge test covers the contents of the Idaho CDL Manual. All CDL applicants (Class A, B and C) must study the following sections: Driving Safely, Transporting Cargo Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Vehicle Inspection Test, Basic Control Skills Test, Road Test. In addition, the Class A CDL test will include questions based on the Combination Vehicles section. Take this CDL practice test now to prepare for the actual ID general knowledge test! To get your CDL, you must pass both the knowledge and skills tests. CDL knowledge tests include: General Knowledge, Passenger Transport, Air Brakes, Combination Vehicles, Hazardous Materials, Tanker Vehicles, Doubles/Triples, School Bus, Firefighter. Depending on what class of license (A, B or C) and endorsements you need, you must take one or more knowledge tests. A special endorsement is also required to drive certain types of vehicles. The following endorsements may be used with a Class A, B or C CDL: HazMat (H), Tank Vehicles (N), Tank Vehicles Transporting Hazardous Materials (X) and Passenger Transport (P). The School Bus endorsement (S) is only available for Class A or B CDL, and the Doubles/Triples endorsement (T) is only available for Class A driver's licenses.
1. To apply the parking brakes:
pull the parking brake control knob out.
push the parking brake control knob in.
place the parking brake control knob in Neutral.
2. When approaching a vehicle as part of a pre-trip inspection, the driver should look under the vehicle for all of the following except:
Windshield wiper fluid
3. Which of the following statements about alcohol is TRUE?
Time is the only method that works to sober you up.
Drinking black coffee will help sober you up.
Taking a cold shower will help sober you up.
4. What should you look for when checking tires?
Cracked valve stems
All of the above
5. You should always be looking for hazards to have time to plan a way out of any emergency. This is part of being a:
reasonable driver.
modular driver.
defensive driver.
6. Placards are:
signs put on the outside of a vehicle that identify the hazard class of the cargo.
used to warn others when the Gross Vehicle Weight (GVW) exceeds 10,000 pounds.
signs put on the inside of a vehicle that remind the driver of the type of cargo he or she is carrying.
7. Why should you be in the proper gear before starting down a hill?
changing gears on a hill is illegal.
it will help you go faster when you reach the bottom of the hill.
gravity can cause the speed of your vehicle to increase.
8. If you have to drive off the road to avoid a collision, you should:
stay on the shoulder until your vehicle has come to a stop.
avoid braking.
All of the above.
9. If your vehicle begins to hydroplane, you should:
accelerate slightly.
brake gently to slow down.
release the accelerator and push in the clutch.
10. Which of the following will not prevent distracted driving?
Clearing the vehicle of any unnecessary objects.
Using your phone only when there is no traffic around you.
Planning your route before you begin driving.
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ID CDL Knowledge Test

Number of questions: 50
Correct answers to pass:40
Passing score:80%
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