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Question:

Before descending a hill, it's essential to be in the right gear because…?

Answer: You won't be able to drop to a lower gear once you start descending

Explanation
Engine braking is essential when descending a hill, which means you have to be in a low gear. When the wheels start to speed up it may be difficult or impossible to change gear.
This question is in Section 1: General Knowledge of our CDL Test Guide. Explore now!
Related Question

Question: Why is it important to use a helper when backing?

Because you have blind spots.

Using a helper when you are backing is important since you will be dealing with blind spots that you are completely unable to see. Before you start, work out hand signals for "stop" and "go."

Question: Why should you conduct a post-trip inspection report?

To alert someone to any safety problems and needed repairs

If there is an issue you need to let the owner and next driver know about it so that it can be rectified, particularly any safety issues.

Question: The hazard class of a two-liter bottle of material is Flammable Liquid. If the description also says Poison Inhalation Hazard you should:

Placard the vehicle with both the POISON and hazard class placards.

Question: Who is responsible for finding out what permits or special routes you will need to haul hazardous materials?

The driver.

Question: When should you use the parking brake?

Every time you leave your vehicle, except for rare exceptions

You should always use your parking brake with a few rare exceptions: if the brakes are very hot or if they are wet and at risk of freezing.

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