Knowledge Test Class B #1

Class B Driving Test | Iowa 2025 #1 Page 3 of 7

Train for FREE online with our Iowa class B license test. The official exam test consists of several obligatory parts, with all of them checking your knowledge of different blocks of road rules. If you need to obtain a IA CDL class B permit in 2025, practice as much as.. Read More

Train for FREE online with our Iowa class B license test. The official exam test consists of several obligatory parts, with all of them checking your knowledge of different blocks of road rules. If you need to obtain a IA CDL class B permit in 2025, practice as much as possible. Free sample tests published on our website will help you check and improve your knowledge and boost your grades. Please bear in mind that CDL class B requirements may vary from state to state.

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15 . How soon after starting a trip must cargo securement be checked?

Cargo should be inspected before beginning a trip, within the first 50 miles of the trip, and every three hours or 150 miles traveled thereafter. The driver of a truck transporting cargo is responsible for the cargo being safely secured throughout the trip.

16 . When in heavy traffic, the safest driving speed is:

In heavy traffic, it is safest to travel at the same speed as other vehicles. If two vehicles continue to drive in the same direction at the same speed, they cannot hit each other.

17 . If exiting a bus, a driver must:

When exiting your vehicle during the basic vehicle control skills test, you must face the vehicle and maintain three points of contact at all times. If your testing vehicle is a bus, you must maintain contact with the handrail. Exiting the vehicle incorrectly may result in automatic failure of the basic vehicle control skills test.

18 . Distracted driving can be avoided by:

Distractions while driving can be physical (such as reaching for an object), mental (such as making conversation with a passenger), or both (such as holding a phone to send texts). Strategies to help you avoid distracted driving include pre-programming radio stations; planning out your route in advance; avoiding complex or emotionally taxing conversation while driving; adjusting your mirrors before setting out; and not eating, drinking, or smoking while behind the wheel.

19 . What helps prevent wheel lockup when braking?

The purpose of an Anti-Lock Braking System (ABS) is to prevent wheel lockup while brakes are being applied.

20 . What is often found in compressed air?

Compressed air in an air brake system usually contains a certain amount of water and compressor oil. The water and oil can damage the brakes if left to accumulate in the system. Tanks must be drained regularly to remove this build-up.

21 . If a five-foot-long item is placed on a flatbed trailer, it must be secured by at least:

Cargo that is required to be tied down should be secured by at least one tie-down for every 10 feet of cargo length. However, at least two tie-downs should be used no matter how small the cargo is.

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