Arkansas CDL — General Knowledge practice
Arkansas 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
13 questions · pass with 10 correct. You get instant feedback and an explanation after every answer.
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.
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1. When using the manual's chart to estimate BAC from the number of drinks, how much should you subtract for time spent drinking?
Correct answer: 0.01% for each 40 minutes of drinking
A note on the BAC chart says to subtract .01% for every 40 minutes spent drinking.
Source: Commercial Driver's License Manual — Section 2.22, Alcohol, Other Drugs, and Driving
2. For some people, how many drinks can it take to show signs of impairment?
Correct answer: Just one
The manual cautions that some people show signs of impairment after a single drink.
Source: Commercial Driver's License Manual — Section 2.22, Alcohol, Other Drugs, and Driving
3. On a first offense, what is the minimum disqualification for driving a CMV under the influence of a controlled substance?
Correct answer: One year
Operating a CMV under the influence of a controlled substance is one of the first offenses carrying at least a one-year disqualification.
Source: Commercial Driver's License Manual — Section 1.3, CDL Disqualifications
4. A driver is convicted of a second CMV alcohol offense. What is the result?
Correct answer: Loss of the CDL for life
First offenses such as driving a CMV at .04% BAC or higher cost the CDL for at least one year, or three years in a placarded hazmat vehicle. A second offense means losing it for life.
Source: Commercial Driver's License Manual — Section 1.3, CDL Disqualifications
5. Which of these may a driver NOT be under the influence of while on duty?
Correct answer: Amphetamines, such as 'pep pills' or 'uppers'
On duty, drivers may not be under the influence of controlled substances, amphetamines (sold as 'pep pills,' 'uppers,' or 'bennies'), narcotics, or any substance that makes driving unsafe. A prescribed drug is permitted only when the doctor says it won't affect safe driving.
Source: Commercial Driver's License Manual — Section 2.22, Alcohol, Other Drugs, and Driving
6. Which BAC does the manual's drinks chart label as the 'Only Safe Driving Limit'?
Correct answer: .00
On the chart, zero drinks and a BAC of .00 are labeled the only safe driving limit. Impairment begins with the first drink.
Source: Commercial Driver's License Manual — Section 2.22, Alcohol, Other Drugs, and Driving
7. On the manual's table of BAC effects, at about what level is a person described as clearly drunk and unable to drive?
Correct answer: .15
The effects table marks .15 as the point of impaired balance and movement, clearly drunk and unable to drive. Coordination begins to slip around .05, and judgment is definitely impaired by .08.
Source: Commercial Driver's License Manual — Section 2.22, Alcohol, Other Drugs, and Driving
8. Besides judgment and inhibition, which abilities does alcohol impair?
Correct answer: Night vision, depth perception, reaction time, and muscle coordination
Alcohol harms night vision, depth perception, reaction time, and muscle coordination, and it affects the parts of the brain that govern judgment and inhibition.
Source: Commercial Driver's License Manual — Section 2.22, Alcohol, Other Drugs, and Driving
9. What does a blood alcohol concentration of .10 mean?
Correct answer: One-tenth of one percent of your blood is alcohol
A BAC of .10 means 1/10 of 1%, or one part in 1,000, of your total blood content is alcohol.
Source: Commercial Driver's License Manual — Section 2.22, Alcohol, Other Drugs, and Driving
10. After alcohol passes through the brain, where does most of it go?
Correct answer: To the liver
Alcohol enters the bloodstream and reaches the brain. A small share then leaves through urine, sweat, and breathing, and the rest goes to the liver, which processes it at a fixed rate.
Source: Commercial Driver's License Manual — Section 2.22, Alcohol, Other Drugs, and Driving
11. A coworker claims a few beers are safer than the same number of shots of liquor. What does the manual say?
Correct answer: It is the alcohol that impairs you, so a standard beer, glass of wine, or shot counts the same
It makes no difference whether the alcohol comes from beer, wine, or liquor. A 12-ounce 5% beer, a 5-ounce 12% wine, and a 1½-ounce shot of 80-proof liquor hold the same amount.
Source: Commercial Driver's License Manual — Section 2.22, Alcohol, Other Drugs, and Driving
12. Which driving errors does the manual list as effects of rising alcohol levels?
Correct answer: Straddling lanes, jerky starts, and running stop signs
Effects as BAC climbs include straddling lanes, jerky starts, not signaling or using lights, blowing through stop signs and red lights, and passing improperly.
Source: Commercial Driver's License Manual — Section 2.22, Alcohol, Other Drugs, and Driving
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