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The school bus endorsement applies to applicants who wish to drive a school bus in any Class A or B CDL. To add an S endorsement to your CLP/CDL, you must pass the Iowa school bus test, and you must also pass skills tests in a school bus. The IA CDL bus test consists of 20 questions, and you'll need at least 16 correct answers to pass (80%). The knowledge test covers the following sections of the Iowa CDL Manual: School Buses, Vehicle Inspection Test, Basic Control Skills Test and Road Test. After studying, take this IA CDL practice test to prepare for the actual bus test!
1. Rough acceleration:
improves gas mileage.
is necessary to warm up the engine.
can cause mechanical damage.
2. The heavier the vehicle:
the higher the center of gravity will be.
the less work the brakes must do to stop it.
the more work the brakes must do to stop it.
3. When approaching a school bus stop, you should:
activate amber warning lights.
continuously check all mirrors.
All of the above.
4. When driving, you should check your mirrors:
every 10 seconds.
only when there may be a problem.
5. If your vehicle has power steering, during your pre-trip external inspection you must check that:
there are no power steering fluid leaks or damage to the power steering hoses.
the engine rpm is down close to idle.
there are 2 lit red lights indicating it's there.
6. School buses are:
one of the fastest forms of transportation.
one of the safest forms of transportation.
the most efficient vehicle on the road.
7. When loading and unloading students, drivers of a school bus should check their mirrors:
After entering the traffic.
After closing the door.
8. If you cannot make a right turn without entering another traffic lane, you should:
turn wide before you start the turn.
turn wide as you complete the turn.
swing wide to the left before starting the turn.
9. You are driving a school bus, When approaching a railroad crossing you should:
activate the 4-way emergency flashers.
stop no closer than 5 feet from the tracks.
cross the tracks in a high gear.
10. When stopping, you should bring the school bus to a full stop how many feet away from students at the bus stop?
At least 5 feet
At least 50 feet
At least 10 feet
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IA CDL School Bus Test

Number of questions: 20
Correct answers to pass:16
Passing score:80%
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