Alcohol & Drugs

Study questions with answers

12 sample Alcohol & Drugs questions with the correct answer, a short explanation, and the official handbook reference. Read through them, then take the quiz above.

1. 1. What is the only thing that will actually sober up someone who has been drinking?

   Correct answer: Time

   Only time will sober you up; coffee, a cold shower, or fresh air will not speed it along.

   Source: Oklahoma CDL Manual — Alcohol, Other Drugs, and Driving

2. 2. While on duty, a driver is prohibited from being under the influence of...

   Correct answer: Any controlled substance, amphetamine, or narcotic

   On-duty drivers may not be impaired by any controlled substance, amphetamine, narcotic, or other drug that affects safe driving.

   Source: Oklahoma CDL Manual — Alcohol, Other Drugs, and Driving

3. 3. As blood alcohol rises, which ability does alcohol affect first?

   Correct answer: Judgment and self-control

   Judgment and self-control, both essential to safe driving, are the first abilities alcohol weakens as it reaches the brain.

   Source: Oklahoma CDL Manual — Alcohol, Other Drugs, and Driving

4. 4. It is illegal to operate a commercial vehicle with a blood alcohol concentration of...

   Correct answer: .04% or more

   Operating a CMV at a BAC of .04% or higher is illegal and will cost you your CDL for at least a year on a first offense.

   Source: Oklahoma CDL Manual — Alcohol, Other Drugs, and Driving

5. 5. Any detectable amount of alcohol below .04% will put a CMV driver...

   Correct answer: Out of service for 24 hours

   A driver with any detectable alcohol under .04% is placed out of service for 24 hours.

   Source: Oklahoma CDL Manual — CDL Disqualifications

6. 6. What can happen when alcohol is combined with other drugs?

   Correct answer: Alcohol can make the drug effects much worse

   Mixing alcohol with other drugs can worsen their effects, so the safest choice is to keep drugs and driving completely apart.

   Source: Oklahoma CDL Manual — Alcohol, Other Drugs, and Driving

7. 7. A 12-ounce glass of beer contains about the same amount of alcohol as...

   Correct answer: A 1.5-ounce shot of 80-proof liquor

   A 12-ounce beer, a 5-ounce glass of wine, and a 1.5-ounce shot of 80-proof liquor all hold the same amount of alcohol.

   Source: Oklahoma CDL Manual — Alcohol, Other Drugs, and Driving

8. 8. Why can over-the-counter cold medicines be a problem for drivers?

   Correct answer: They may make the driver drowsy

   Many cold medicines can make a driver drowsy or otherwise affect safe driving.

   Source: Oklahoma CDL Manual — Alcohol, Other Drugs, and Driving

9. 9. By operating a commercial vehicle, you are considered to have agreed to...

   Correct answer: Alcohol testing

   Driving a CMV means you are deemed to have consented to alcohol testing.

   Source: Oklahoma CDL Manual — CDL Disqualifications

10. 10. Which factors determine a person's blood alcohol concentration?

    Correct answer: How much you drink, how fast you drink, and your weight

    BAC depends on how much you drink, how fast you drink it, and your body weight.

    Source: Oklahoma CDL Manual — Alcohol, Other Drugs, and Driving

11. 11. Which abilities does alcohol impair?

    Correct answer: Reaction time, depth perception, night vision, and muscle coordination

    Drinking dulls muscle coordination, slows reaction time, and weakens both depth perception and night vision.

    Source: Oklahoma CDL Manual — Alcohol, Other Drugs, and Driving

12. 12. If you become too ill to drive safely, what should you do?

    Correct answer: Not drive, except to the nearest safe stop in an emergency

    Do not drive when too ill; only in an emergency may you continue to the closest place you can safely stop.

    Source: Oklahoma CDL Manual — Alcohol, Other Drugs, and Driving