Florida CDL — General Knowledge: Alcohol & Drugs Practice Test

Question 1

Which combination decides how high a person's blood alcohol concentration will climb?

Accepted Answer

How much is consumed, how quickly it goes down, and what the person weighs — More alcohol, quicker drinking and a lighter body each push the reading upward. A small person reaches the same concentration on noticeably less.

Answer

The proof of the drink and the temperature of the room

Answer

The person's height and the hour of the day

Answer

How much food is eaten afterward

Question 2

Under what condition may a driver take a medicine prescribed by a physician and still operate a commercial vehicle?

Accepted Answer

When the physician has told the driver it will not interfere with driving safely — A drug supplied by a doctor is allowed only with that assurance behind it. Warning labels and the doctor's instructions are worth reading before a trip, because many cold and allergy remedies bring on drowsiness.

Answer

Whenever the prescription was filled in the driver's home state

Answer

Whenever the dose is taken at the end of the shift

Answer

Whenever the same medicine is sold over the counter elsewhere

Question 3

Under implied-consent rules, what have you agreed to by driving a commercial vehicle?

Accepted Answer

You agree to submit to alcohol or drug testing when asked — By driving, you have already agreed to be tested for alcohol or drugs when lawfully asked. Refusing the test brings the same kind of penalty as failing it.

Answer

You can never be asked to take a test

Answer

You may choose testing only after seeing a lawyer first

Question 4

How does a 12-ounce beer compare with a 5-ounce glass of table wine or a shot of 80-proof liquor?

Accepted Answer

All three carry roughly the same quantity of alcohol — What matters is the alcohol itself, not the glass it arrives in. Counting drinks tells you nothing useful unless you know that each one carries about the same load.

Answer

The beer holds far less alcohol than the other two

Answer

The wine is by a wide margin the weakest of the three

Answer

The liquor is the only one of the three that raises BAC

Question 5

Which set of driving errors typically shows up in someone who has been drinking?

Accepted Answer

Weaving, drifting between lanes, jerky starts and rolling through red lights — Alcohol stretches reaction time and ruins lane keeping, so speed turns uneven and traffic controls get missed. Spotting that pattern in another vehicle is reason enough to hang back and give it plenty of room.

Answer

Signaling too early and braking too gently

Answer

Checking the mirrors too often and turning over-cautiously

Answer

Downshifting sooner than the grade calls for

Question 6

Which statement about other drugs and driving a CMV is correct?

Accepted Answer

Prescription and over-the-counter drugs can also impair driving — Many prescription and over-the-counter medicines — such as some cold or allergy pills — cause drowsiness or slow reactions. Do not drive on any drug that impairs you, and follow the law and your employer's rules.

Answer

Only illegal drugs can affect driving

Answer

Coffee cancels out any medication's effects

Question 7

As alcohol first reaches the brain, which ability gives way before the others?

Accepted Answer

Judgment and self-control — The region that governs judgment goes first, which is exactly why a drinker often cannot tell how impaired they have become. Vision, coordination and muscle control fall away as the concentration keeps climbing.

Answer

Long-term memory

Answer

The sense of smell

Answer

Grip strength in the hands

Question 8

A test shows a trace of alcohol in a commercial driver's system, below the legal ceiling for a CMV. What follows?

Accepted Answer

The driver is placed out of service for 24 hours — Any measurable alcohol beneath the commercial limit still parks the driver for a full day. At or above that limit the consequences step up to disqualification.

Answer

Nothing at all, since the reading sits under the limit

Answer

An immediate lifetime disqualification

Answer

A written warning with no other effect

Question 9

What is the only thing that will lower a person's blood alcohol concentration over time?

Accepted Answer

Time — Only time lets the body remove alcohol. Coffee, a cold shower, or exercise may make a person feel more awake but do nothing to reduce the actual impairment.

Answer

Drinking strong coffee

Answer

A cold shower

Question 10

What blood alcohol concentration (BAC) is the legal limit while operating a commercial motor vehicle?

Accepted Answer

0.04 — A CDL holder is considered legally impaired at 0.04 BAC — half the 0.08 limit for regular drivers. Operating a CMV at or above 0.04 leads to a disqualification.

Answer

0.08

Answer

0.10

Answer

There is no limit for CDL holders

Florida CDL — General Knowledge: Alcohol & Drugs practice test

Study questions with answers

1. Which combination decides how high a person's blood alcohol concentration will climb?

2. Under what condition may a driver take a medicine prescribed by a physician and still operate a commercial vehicle?

3. Under implied-consent rules, what have you agreed to by driving a commercial vehicle?

4. How does a 12-ounce beer compare with a 5-ounce glass of table wine or a shot of 80-proof liquor?

5. Which set of driving errors typically shows up in someone who has been drinking?

6. Which statement about other drugs and driving a CMV is correct?

7. As alcohol first reaches the brain, which ability gives way before the others?

8. A test shows a trace of alcohol in a commercial driver's system, below the legal ceiling for a CMV. What follows?

9. What is the only thing that will lower a person's blood alcohol concentration over time?

10. What blood alcohol concentration (BAC) is the legal limit while operating a commercial motor vehicle?

More CDL — General Knowledge topics

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