Delaware CDL — General Knowledge practice
Delaware 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
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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. What do the accident statistics mentioned in the manual show about drivers who have been drinking?
Correct answer: They are far more likely to crash than drivers who have not been drinking
The manual says accident statistics show a much higher chance of a crash for drinking drivers than for those who have not been drinking, along with a higher chance of losing the license.
Source: Delaware Commercial Driver's Manual — Section 2.22.1, Alcohol and Driving
2. After a roadside check, a CMV driver is put out of service for 24 hours but does not lose the CDL for a year. Which alcohol finding fits that outcome?
Correct answer: A detectable amount of alcohol below .04%
Any detectable alcohol under .04% results in 24 hours out of service. A BAC of .04% or more, or refusing the test, costs the CDL for at least a year on a first offense.
Source: Delaware Commercial Driver's Manual — Section 1.3.2, Alcohol, Leaving the Scene of an Accident, and Commission of a Felony
3. According to the manual's table of BAC effects, which statement correctly compares a BAC of .30 with a BAC of .40?
Correct answer: At .30 many people lose consciousness; at .40 most do, and some die
The table lists .30 as the level where many lose consciousness and .40 as the level where most lose consciousness and some die. Breathing stopping is listed at .50.
Source: Delaware Commercial Driver's Manual — Section 2.22.2, Other Drugs (Effects of Increasing Blood Alcohol Content)
4. A driver who has been drinking plans to take a cold shower and drink black coffee before a shift. According to the manual, what will actually sober the driver up?
Correct answer: Only the passage of time
The liver handles alcohol at a fixed rate, so the manual says time alone sobers a person up. Coffee and cold showers do not speed it along.
Source: Delaware Commercial Driver's Manual — Section 2.22.1, Alcohol and Driving
5. On the drinks chart in the manual, which label appears beside the row for a single drink?
Correct answer: Impairment Begins
The chart labels zero drinks as the only safe driving limit and marks the one-drink row with 'Impairment Begins.' The manual also notes that for some people one drink is enough to show impairment.
Source: Delaware Commercial Driver's Manual — Section 2.22.1, Alcohol and Driving
6. A Delaware CDL holder is convicted of refusing an alcohol test while driving the family car on a weekend. Under the state's summary of major violations, what happens to the CDL?
Correct answer: It is disqualified for one year, because major violations count in a private passenger vehicle too
Refusing an alcohol test is on the major violations list, and the summary applies a one-year disqualification to a first major violation whether it happened in a private passenger vehicle or a CMV.
Source: Delaware Commercial Driver's Manual — Important Information for CDL Holders, Major Violations
7. What does Delaware's manual say about a single traffic violation involving alcohol or drugs?
Correct answer: It brings severe penalties, with no exceptions
The manual is blunt: any one traffic violation that involves alcohol or drugs results in severe penalties, and it adds the words 'no exceptions.'
Source: Delaware Commercial Driver's Manual — Suspension/Disqualification/Revocations
8. The manual says alcohol reaches the part of the brain that controls judgment and self-control first. As BAC keeps rising, which abilities does it say suffer increasingly?
Correct answer: Muscle control, vision, and coordination
After judgment and self-control, the manual says continued BAC buildup increasingly affects muscle control, vision, and coordination, which shows up as driving errors such as straddling lanes.
Source: Delaware Commercial Driver's Manual — Section 2.22.1, Alcohol and Driving
9. A driver takes a stimulant drug to stay awake on an overnight run. What does the manual's fatigue guidance say about such drugs?
Correct answer: They might hold off sleep for a time, but they do not make you alert
The manual's advice is to avoid drugs, because staying awake is not the same as being alert. The only safe cure for drowsiness is sleep.
Source: Delaware Commercial Driver's Manual — Section 2.11.2, Driver Factors
10. Using the manual's drinks chart, a 160-pound driver has four drinks over 80 minutes. The chart shows .09 for four drinks at that weight. After the chart's time adjustment, what is the estimated BAC?
Correct answer: .07
The chart's footnote takes off .01% for every 40 minutes spent drinking. Eighty minutes is two such periods, so .09 minus .02 leaves about .07, still well above the .04 CMV limit.
Source: Delaware Commercial Driver's Manual — Section 2.22.1, Alcohol and Driving
11. By signing a Delaware CDL application, what do you consent to in addition to certifying your personal information and driving history?
Correct answer: Submitting to chemical tests for controlled substances
The manual says the signature certifies that your personal information and driving history are correct, and it also gives consent to chemical testing for controlled substances.
Source: Delaware Commercial Driver's Manual — Procedures for Obtaining a CDL
12. A roadside test in Delaware shows a CMV driver at exactly .04 BAC. The driver is steady and shows no sign of impairment. How does the state's list of major violations treat this?
Correct answer: It is still a major violation, because operating a CMV at .04 or higher is listed on its own
The list names operating a CMV with a BAC of .04 or above as a major violation by itself, separate from driving under the influence. A first conviction means a one-year disqualification.
Source: Delaware Commercial Driver's Manual — Important Information for CDL Holders, Major Violations
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