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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. Why should you put the starter switch key in your pocket during the pre-trip inspection?
You will need it to inspect the trailer.
So you don't lose it.
So no one moves the vehicle while you are inspecting underneath it.
2. Cargo tie-downs are used to:
keep cargo from shifting or falling.
prevent right-turn accidents.
prevent freezing.
3. When you discover a fire, if the trailer doors are hot you should not open them because:
opening the doors lets air in and may make the fire flare up.
the temperature of the trailer should not be changed in any way.
with air many fires do less damage.
4. When possible, you should park:
so you will have to back up when you leave.
on the shoulder.
so you will be able to pull forward when you leave.
5. There are two ways of knowing when to shift up:
Automatic transmissions and shift indicator light.
Engine speed and road speed
Weather conditions and road speed.
6. When driving at night you should dim your lights when following another vehicle within:
1 mile.
500 feet.
100 feet.
7. Before transporting sealed loads, you should check that:
the load can be inspected.
the seal numbers match the placard numbers.
the load is properly secured.
8. When steering to avoid a crash, you should:
steer with one hand so that you can turn the wheel more quickly.
apply the brakes while turning.
not turn any more than needed to clear what is in your way.
9. In which of the following situations should you check your mirrors more often?
When changing lanes or merging.
When driving on a single lane road.
When driving on a narrow road.
10. If you are feeling sleepy, you should:
slow down.
get some coffee.
pull off the road and rest.
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ID CDL Practice Test

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