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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. Buses must never carry:
irritating material.
small arms ammunition labeled ORM-D.
emergency hospital supplies.
2. Air brakes use ________ to make the brakes work.
compressed gases
compressed gas cylinders
compressed air
3. When unloading at the school, the driver should:
make sure the students are returning to the bus.
walk through the bus and check for hiding/sleeping students.
ask one of the students to supervise unloading.
4. When driving in a construction zone, if a construction worker is near the road, you should:
further reduce your speed.
maintain a constant speed.
come to a complete stop.
5. If the drive wheels begin to spin, you should:
accelerate smoothly and change gears as necessary.
take your foot off the accelerator.
apply your brakes all the way.
6. Before driving your bus, you must:
clean the interior.
review the inspection report.
ensure the emergency exit door is open.
7. During an emergency student safety is generally best maintained by:
keeping students on the bus.
leading students as far away from the bus as possible.
leading students downwind of the bus if fire is present.
8. At passive railroad crossings, even if there are active railroad signals that indicate the tracks are clear, you must _________  to be sure it is safe to proceed.
go, stop and listen
listen, look and stop
stop, look, and listen
9. If your bus is equipped with a roof-mounted strobe light, you should use it:
whenever possible.
only in an emergency.
when you have limited visibility.
10. If a student drops something in front of the bus, the student should:
pick up the object as quickly as possible.
leave the item where it fell, and get the driver's attention and permission to retrieve the item.
ask the driver to retrieve the item.
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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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