Wisconsin CDL — General Knowledge practice
Wisconsin 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.
Show all 12 questions with answers
1. After you drink alcohol, where does it go in the body?
Correct answer: It goes directly into the bloodstream and to the brain
Alcohol passes straight into the bloodstream and is carried to the brain, where it affects driving abilities.
Source: Wisconsin CDL Manual, Section 2.22.1 — How Alcohol Works
2. Which pairing contains the same amount of alcohol as a 1.5-ounce shot of 80-proof liquor?
Correct answer: A 12-ounce glass of 5% beer
A 12-ounce glass of 5 percent beer holds the same amount of alcohol as that shot or a 5-ounce glass of wine.
Source: Wisconsin CDL Manual, Section 2.22.1 — How Alcohol Works
3. Which driving-related abilities does alcohol impair?
Correct answer: Coordination, reactions, depth perception, and seeing at night
Alcohol weakens coordination, slows reactions, and harms depth perception as well as vision after dark, all vital to driving.
Source: Wisconsin CDL Manual, Section 2.22.1 — Alcohol and Driving
4. What is the only thing that will actually sober up a person who has been drinking?
Correct answer: The passage of time
Because the body eliminates alcohol at a fixed rate, only the passage of time will sober someone up.
Source: Wisconsin CDL Manual, Section 2.22.1 — How Alcohol Works
5. Which factors determine a person's blood alcohol concentration?
Correct answer: Amount consumed, how fast, and body weight
BAC depends on how much you drink, how fast you drink it and your body weight.
Source: Wisconsin CDL Manual, Section 2.22.1 — What Determines Blood Alcohol Concentration
6. What is the only real cure for fatigue, according to the manual?
Correct answer: Rest
No drug can substitute for sleep; the only genuine cure for fatigue is rest.
7. Why should a driver be cautious about ordinary cold medicines?
Correct answer: They can cause drowsiness that affects driving
Many over-the-counter cold remedies can make you drowsy and affect your ability to drive safely.
8. About how much alcohol can the liver process in one hour?
Correct answer: About one third of an ounce
The liver clears only about one third of an ounce of alcohol per hour, a fixed rate that cannot be sped up.
Source: Wisconsin CDL Manual, Section 2.22.1 — How Alcohol Works
9. Under Wisconsin's Implied Consent law, what happens if you refuse a requested test for alcohol or drugs?
Correct answer: Your operating privilege is revoked for at least a year
Refusing the officer's test revokes your operating privilege for at least one year, along with other penalties.
Source: Wisconsin CDL Manual, Warnings and Penalties — Implied Consent Law
10. How does alcohol interact with other drugs a driver may have taken?
Correct answer: It can make their effects much worse
Mixing alcohol with other drugs can intensify their effects, so pairing either with driving is especially risky.
11. What does the law say about amphetamines such as 'pep pills' or 'uppers' for a commercial driver on duty?
Correct answer: They are prohibited while on duty
Being under the influence of amphetamines or similar controlled substances while on duty is prohibited.
12. When is it acceptable for a driver to use a drug a doctor has prescribed?
Correct answer: If the doctor says it won't affect safe driving
It is allowed when the prescribing physician tells the driver the medication will not hurt safe driving ability.
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