Tennessee: Alcohol and drugs — Part 2 Practice Test
Questions in this part include: “At a BAC of .17 percent, how many times more likely are you to cause a crash?” · “What does alcohol do to glare recovery?”
Independent educational site · not affiliated with any government agency or DMV
Ready? Test yourself
- Instant feedback with an explanation
- Every answer cites its source in the manual
- Your best score is saved on this device
- Keyboard: press 1 to 4 to answer and Enter for the next question
Questions are original and based on the official manual "Tennessee Comprehensive Driver License Manual" (March 2025 printing), Tennessee Department of Safety and Homeland Security.
All 19 questions in this practice test
Take the test above first, then use this list to study. Tap “Show answer” to see the correct answer and explanation.
Show the questions and answersHide the questions
-
At a BAC of .17 percent, how many times more likely are you to cause a crash?
- 7 times
- 50 times
- 15 times
- 25 times
Show answer
Correct answer: 50 times
At .17 percent BAC you are 50 times more likely to cause a crash.
Source: Tennessee Comprehensive Driver License Manual (March 2025 printing), page 79 · Open this page in the manual (Manual page 79)
-
The more you drink in a fixed amount of time, what happens to your BAC?
- It registers lower
- It stays the same
- It drops once you weigh more
- It registers higher
Show answer
Correct answer: It registers higher
Each drink within an hour increases BAC, regardless of your weight or the kind of alcoholic beverage.
Source: Tennessee Comprehensive Driver License Manual (March 2025 printing), page 79 · Open this page in the manual (Manual page 79)
-
What does the manual call a BAC of .08 percent and above?
- Legal intoxication
- Social drinking
- Mild impairment
- Low tolerance
Show answer
Correct answer: Legal intoxication
The table of alcohol's effects labels BAC of .08 percent and above legal intoxication and says it is definitely unsafe to drive.
Source: Tennessee Comprehensive Driver License Manual (March 2025 printing), page 80 · Open this page in the manual (Manual page 80)
-
The manual says research has proven that driving skills, good judgment and vision are greatly impaired at BAC levels as low as which numbers?
- .10 and .12 percent
- .08 and .10 percent
- .03 and .04 percent
- .15 and .17 percent
Show answer
Correct answer: .03 and .04 percent
Even small BAC levels of .03 and .04 percent greatly impair driving skills, judgment and vision, especially for young drinkers.
Source: Tennessee Comprehensive Driver License Manual (March 2025 printing), page 80 · Open this page in the manual (Manual page 80)
-
Which two abilities does the manual say are most important to the driving task?
- Speed and braking
- Judgment and vision
- Hearing and smell
- Strength and balance
Show answer
Correct answer: Judgment and vision
Judgment and vision are the two abilities most important to driving, and both are affected by small amounts of alcohol.
Source: Tennessee Comprehensive Driver License Manual (March 2025 printing), page 80 · Open this page in the manual (Manual page 80)
-
After how many drinks are your abilities to judge speed, time and distance altered?
- After two drinks
- After three drinks
- After four drinks
- After only one drink
Show answer
Correct answer: After only one drink
The ability to judge speed, time and distance is altered after only one drink.
Source: Tennessee Comprehensive Driver License Manual (March 2025 printing), page 80 · Open this page in the manual (Manual page 80)
-
What is the first thing affected after drinking alcohol?
- A person's judgment
- Hearing
- Balance
- Muscle strength
Show answer
Correct answer: A person's judgment
The first thing affected after drinking alcohol is a person's judgment; alcohol quickly reaches the brain and short-circuits the parts that control judgment, emotions and confidence.
Source: Tennessee Comprehensive Driver License Manual (March 2025 printing), page 83 · Open this page in the manual (Manual page 83)
-
Which of these is an example of the unnecessary and dangerous risks taken by people under the influence of alcohol?
- Driving below the speed limit on a clear road
- Signaling early before a lane change
- Passing cars without enough clear distance
- Leaving a long gap behind the car ahead
Show answer
Correct answer: Passing cars without enough clear distance
Impaired judgment leads to risks like driving too fast, passing without enough clear distance and speeding around curves.
Source: Tennessee Comprehensive Driver License Manual (March 2025 printing), page 80 · Open this page in the manual (Manual page 80)
-
By how much does alcohol reduce the ability to see clearly at night?
- By about one-tenth
- By more than half
- By about one-quarter
- It does not affect night vision
Show answer
Correct answer: By more than half
Alcohol reduces the ability to see clearly at night by more than half.
Source: Tennessee Comprehensive Driver License Manual (March 2025 printing), page 80 · Open this page in the manual (Manual page 80)
-
At a BAC of .05 percent, side vision is reduced by about how much?
- About 10 percent
- About 15 percent
- About 60 percent
- About 30 percent
Show answer
Correct answer: About 30 percent
Alcohol reduces side vision by about 30 percent at .05 percent BAC.
Source: Tennessee Comprehensive Driver License Manual (March 2025 printing), page 80 · Open this page in the manual (Manual page 80)
-
What does alcohol do to glare recovery?
- It slows it
- It speeds it up
- It has no effect on it
- It improves it at night
Show answer
Correct answer: It slows it
Alcohol slows glare recovery, and glare vision is also poor because the eye muscles are relaxed.
Source: Tennessee Comprehensive Driver License Manual (March 2025 printing), page 80 · Open this page in the manual (Manual page 80)
-
Why is judging depth or distance affected by alcohol?
- Alcohol shrinks the pupils so less light enters
- Alcohol blocks all vision in one eye
- Each eye gets a slightly different picture
- Alcohol makes the eyes produce too many tears
Show answer
Correct answer: Each eye gets a slightly different picture
Alcohol makes each eye receive a slightly different picture, which interferes with judging depth and distance.
Source: Tennessee Comprehensive Driver License Manual (March 2025 printing), page 80 · Open this page in the manual (Manual page 80)
-
About what part of the information used in driving do the eyes provide?
- About half
- Almost 90 percent
- About one-quarter
- About 70 percent
Show answer
Correct answer: Almost 90 percent
The eyes provide almost 90 percent of the information used in driving, so any restriction of vision can be disastrous.
Source: Tennessee Comprehensive Driver License Manual (March 2025 printing), page 80 · Open this page in the manual (Manual page 80)
-
Reaction and coordination are impaired by alcohol consumption at a BAC as low as what level?
- .05 percent
- .08 percent
- .10 percent
- .02 percent
Show answer
Correct answer: .02 percent
The manual says reaction and coordination are impaired at BAC levels as low as .02 percent.
Source: Tennessee Comprehensive Driver License Manual (March 2025 printing), page 80 · Open this page in the manual (Manual page 80)
-
How does the manual classify alcohol, in any concentration?
- As a depressant, not a stimulant
- As a stimulant, not a depressant
- As a neutral substance with no effect on nerves
- As a food that helps concentration
Show answer
Correct answer: As a depressant, not a stimulant
Alcohol slows all nerve impulses and body functions, so it is a depressant even though small doses can feel stimulating.
Source: Tennessee Comprehensive Driver License Manual (March 2025 printing), page 81 · Open this page in the manual (Manual page 81)
-
What causes the false feeling of stimulation that comes with small doses of alcohol?
- A faster heartbeat
- More oxygen reaching the brain
- A lessening of inhibitions
- Faster nerve impulses
Show answer
Correct answer: A lessening of inhibitions
The feeling comes from relaxed inhibitions, not real stimulation; alcohol actually limits alertness and concentration.
Source: Tennessee Comprehensive Driver License Manual (March 2025 printing), page 81 · Open this page in the manual (Manual page 81)
-
When alcohol is combined with another depressant, such as tranquilizers or sedatives, what are the results?
- They are simply added together
- They are multiplied, not just added together
- They cancel each other out
- They are the same as with alcohol alone
Show answer
Correct answer: They are multiplied, not just added together
Mixing alcohol with another depressant multiplies the effects, making them much stronger and more dangerous.
Source: Tennessee Comprehensive Driver License Manual (March 2025 printing), page 81 · Open this page in the manual (Manual page 81)
-
If a drug was prescribed by your doctor, is that a defense for driving under the influence of it?
- Yes, if your doctor approved it
- Yes, if you took the dose as directed
- Yes, but only for tranquilizers
- No, by law it is no defense
Show answer
Correct answer: No, by law it is no defense
Tennessee law says that a prescription is no defense for driving under the influence of the drug.
Source: Tennessee Comprehensive Driver License Manual (March 2025 printing), page 81 · Open this page in the manual (Manual page 81)
-
If your doctor prescribes a tranquilizer or sedative, what should you make a point to do?
- Discuss how the drug will affect your ability to drive safely
- Assume it is safe to drive because it was prescribed
- Take it only after you have started driving
- Keep the prescription a secret from other drivers
Show answer
Correct answer: Discuss how the drug will affect your ability to drive safely
The manual advises talking with your doctor about how the drug will affect your driving.
Source: Tennessee Comprehensive Driver License Manual (March 2025 printing), page 81 · Open this page in the manual (Manual page 81)