Georgia CDL — General Knowledge practice
Georgia CDL — General Knowledge: Alcohol & Drugs practice test
Blood alcohol limits, zero-tolerance and implied-consent laws, and how alcohol and drugs — legal or not — affect your driving.
Content reviewed against official driver handbooks · August 12, 2026
10 questions · pass with 8 correct. You get instant feedback and an explanation after every answer.
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10 sample Alcohol & Drugs questions with the correct answer, a short explanation, and the official handbook reference. Read through them, then take the quiz above.
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1. A driver commits a first alcohol-related offense while operating a commercial vehicle that is placarded for hazardous materials. The CDL will be lost for at least:
Correct answer: 3 years
The usual penalty for a first alcohol offense is a one-year loss of the CDL, but hauling placarded hazardous materials at the time raises that minimum to three years.
Source: Georgia CDL Manual — Alcohol, Leaving the Scene of an Accident, and Commission of a Felony
2. Which set of drinks all deliver about the same quantity of alcohol?
Correct answer: A 12-ounce beer at 5 percent, a 5-ounce glass of 12 percent wine, and a 1.5-ounce shot of 80 proof liquor
A twelve-ounce beer at five percent, a five-ounce pour of twelve percent wine, and a shot of an ounce and a half of eighty proof liquor each carry a comparable amount of alcohol, so none of them is the 'safe' choice.
3. As blood alcohol concentration begins to rise, the first part of the brain to be affected controls:
Correct answer: Judgment and self-control
Judgment and self-restraint go first, which is exactly why a drinker often cannot tell how impaired he or she is becoming. Muscle control, vision and coordination fall off as the concentration climbs further.
4. A driver has been drinking and now wants to sober up quickly. Which statement is correct?
Correct answer: Only the passing of time will bring the alcohol level down
The liver burns off roughly a third of an ounce of alcohol each hour, and that pace cannot be hurried. Coffee, a cold shower, food or exercise change nothing; waiting is the only thing that lowers the level in your blood.
5. By driving a commercial vehicle, under 'implied consent' laws you have agreed to:
Correct answer: Submit to testing for alcohol or drugs when lawfully requested
Holding a CDL and driving means you have consented to testing for alcohol and drugs when lawfully requested. Refusing a test carries penalties similar to those for driving impaired.
6. It is illegal to operate a commercial vehicle with a blood alcohol concentration (BAC) of:
Correct answer: 0.04 or higher
The BAC limit for driving a commercial vehicle is 0.04 or higher, half the 0.08 limit that applies to most other drivers. Even a lower amount can lead to being placed out of service.
7. Alcohol affects a driver mainly by:
Correct answer: Slowing reactions and impairing judgment, coordination, and vision
Alcohol slows reactions and impairs judgment, coordination, and vision, the exact skills a driver needs. These effects begin with the first drink, well before a person feels drunk.
8. Which statement about drugs other than alcohol is true for a commercial driver?
Correct answer: Prescription and over-the-counter medicines can impair driving and some are prohibited
Many prescription and over-the-counter medicines can impair driving, and some drugs are prohibited for commercial drivers entirely. Read labels and check with a doctor before driving.
Source: Georgia CDL Manual — Other Drugs
9. A person's blood alcohol concentration is determined mainly by:
Correct answer: How much is consumed, how fast it is consumed, and body weight
Three things drive the number: how much alcohol goes in, how quickly it is consumed, and body weight. A lighter person reaches a given concentration on less alcohol than a heavier one.
10. A commercial driver is tested and shows a measurable amount of alcohol that is still below .04 percent. That driver will be:
Correct answer: Placed out of service for 24 hours
Any detectable alcohol below the .04 threshold does not trigger the one-year disqualification, but it does put the driver out of service for a full 24 hours.
Source: Georgia CDL Manual — Alcohol, Leaving the Scene of an Accident, and Commission of a Felony
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