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Any driver, regardless of the vehicle Class, who wants to haul hazardous materials, must add an “H” endorsement to their CDL. In order to obtain the Hazmat endorsement drivers are required to pass a Transportation Security Administration background check and a knowledge test. The District of Columbia hazmat test consists of 30 questions. To pass, you must correctly answer at least 24 questions (80%). The DC CDL hazmat test covers the information found in the District of Columbia CDL Manual. Study the chapter covering hazardous materials to learn how to recognize, handle, and transport Hazmat, then take this practice test to prepare for your exam!
1. If you have convex mirrors, be aware that:
objects may appear to be faster than they really are.
in a convex mirror objects appears larger than they really are.
objects seem closer than they really are.
everything appears smaller in a convex mirror than it would if you were looking at it directly.
2. If a shipping paper describes both hazardous and non-hazardous products, the hazardous materials must be:
listed at the bottom.
identified by an "H" placed before the shipping description.
entered first.
written in a larger font.
3. When driving at night you should:
always use low beams.
use your high beams when it is safe and legal to do so.
keep the interior light on.
All of the above.
4. A vehicle inspection should be done:
the same way each time so you are less likely to forget something.
by a helper whenever possible.
differently each time, so you are less likely to forget something.
once every month.
5. You must have at least 4/32 inch tread depth in every major groove on front tires and at least ___ inch on other tires.
6. Which of the following statements about retarders is NOT correct?
Retarders reduce reduce brake wear.
You should turn the retarder off whenever the road is wet, icy, or snow covered.
Retarders help slow a vehicle, reducing the need for using brakes.
Retarders help you avoid skids.
7. When you are out of the vehicle, you must keep shipping papers related to hazardous materials:
on the driver's seat.
in a locked glove compartment.
in a pouch on the driver's door.
None of the above.
8. Identification numbers are a 4 digit code used to identify hazardous materials. The identification number is preceded by the letters "NA" or "UN". The letters "NA" are associated with proper shipping names that are only used:
within the United States and to and from Canada.
within the national borders.
within the United States and North Africa.
9. As you approach off ramps and on ramps, remember:
that downgrades make it easier to reduce speed.
that the posted speed limit may not be safe for larger vehicles.
to maintain your highway speed.
to always brake and turn at the same time.
10. If the words "Inhalation Hazard" appears on the shipping paper, the __________ placard must be displayed.
Poison Inhalation Hazard or Poison Gas
Corrosive Materials
Liquid Gas
Reportable Quantity Hazard
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DC CDL Hazmat Test

Number of questions: 30
Correct answers to pass:24
Passing score:80%
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