Idaho: Alcohol and drugs — Part 2 Practice Test
Questions in this part include: “At an alcohol concentration slightly above .05, what happens to the risk of causing a crash?” · “Studies show that a combination of alcohol and anger is responsible for much of what kind of driving?”
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Questions are original and based on the official manual "Idaho Driver's Handbook" (July 2026), Idaho Transportation Department.
All 20 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.
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At an alcohol concentration slightly above .05, what happens to the risk of causing a crash?
- It stays the same
- It increases by half
- It doubles
- It triples
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Correct answer: It doubles
The handbook states that at slightly above .05 the risk of causing a crash doubles.
Source: Idaho Driver's Handbook (July 2026), page 128 · Open this page in the manual (Manual page 128)
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At an alcohol concentration of .10, the risk of causing a crash is:
- four times as great
- six times as great
- ten times as great
- twelve times as great
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Correct answer: six times as great
At .10 the handbook says the risk is six times as great.
Source: Idaho Driver's Handbook (July 2026), page 128 · Open this page in the manual (Manual page 128)
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At an alcohol concentration of .15, the risk of causing a crash is:
- 10 times as great
- 15 times as great
- 50 times as great
- 25 times as great
Show answer
Correct answer: 25 times as great
The handbook says the risk at .15 is 25 times as great.
Source: Idaho Driver's Handbook (July 2026), page 128 · Open this page in the manual (Manual page 128)
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How does the amount of alcohol in 12 ounces of beer compare with that in a jigger of 80-proof hard liquor and five ounces of table wine?
- They all contain approximately the same amount
- Beer contains about half as much as the others
- Hard liquor contains about twice as much as beer
- Table wine contains the most of the three
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Correct answer: They all contain approximately the same amount
A jigger of 80-proof liquor, five ounces of table wine, and 12 ounces of beer all contain approximately the same amount of alcohol, about an ounce each.
Source: Idaho Driver's Handbook (July 2026), page 129 · Open this page in the manual (Manual page 129)
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How many ounces of 80-proof hard liquor make up one jigger?
- 0.5 ounce
- 2 ounces
- 1.5 ounces
- 3 ounces
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Correct answer: 1.5 ounces
The handbook defines a jigger as 1.5 ounces of 80-proof hard liquor.
Source: Idaho Driver's Handbook (July 2026), page 129 · Open this page in the manual (Manual page 129)
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Studies have found that the greatest percentage of people arrested for driving under the influence had been drinking what?
- Hard liquor
- Beer
- Wine
- Mixed drinks
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Correct answer: Beer
The handbook reports that studies found the greatest percentage of people arrested for driving under the influence had been drinking beer.
Source: Idaho Driver's Handbook (July 2026), page 129 · Open this page in the manual (Manual page 129)
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How does alcohol get into your bloodstream?
- Only after the liver and kidneys have filtered it
- Through the lungs and then straight to the heart
- Through the kidneys, then on to the stomach
- Directly through the stomach and small intestine
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Correct answer: Directly through the stomach and small intestine
The handbook says alcohol passes directly through your stomach and small intestine into the bloodstream.
Source: Idaho Driver's Handbook (July 2026), page 129 · Open this page in the manual (Manual page 129)
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On an empty stomach, how fast does alcohol pass into the bloodstream?
- Almost immediately
- After about an hour
- Only after two drinks
- Somewhat longer than usual
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Correct answer: Almost immediately
On an empty stomach the process takes place almost immediately; on a full stomach it takes somewhat longer.
Source: Idaho Driver's Handbook (July 2026), page 129 · Open this page in the manual (Manual page 129)
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When alcohol reaches your brain, what does it promote?
- Alertness
- Quick reactions
- Relaxation
- Better balance
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Correct answer: Relaxation
The handbook states that when alcohol reaches your brain, it promotes relaxation.
Source: Idaho Driver's Handbook (July 2026), page 129 · Open this page in the manual (Manual page 129)
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After how many drinks does alcohol begin to impair your reaction time, coordination, and balance?
- One drink
- Two to four drinks
- Five to seven drinks
- Eight or more drinks
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Correct answer: Two to four drinks
The handbook says that after two to four drinks alcohol begins to impair reaction time, coordination, and balance.
Source: Idaho Driver's Handbook (July 2026), page 129 · Open this page in the manual (Manual page 129)
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After two to four drinks, which of these also suffers, making it harder to react to dangers ahead?
- Your hearing and your sense of smell
- Your knowledge of Idaho traffic laws
- Your ability to remember routes
- Your vision and ability to judge distance
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Correct answer: Your vision and ability to judge distance
The handbook says vision and the ability to judge distance suffer too, making it harder to react to dangers ahead.
Source: Idaho Driver's Handbook (July 2026), page 129 · Open this page in the manual (Manual page 129)
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Once alcohol is in your bloodstream, what will return you to normal?
- Only time
- Black coffee
- Exercise
- Eating a meal
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Correct answer: Only time
Neither aspirin, black coffee, deep breathing, exercise, nor eating will sober you up; only time will return you to normal.
Source: Idaho Driver's Handbook (July 2026), page 129 · Open this page in the manual (Manual page 129)
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Studies show that a combination of alcohol and anger is responsible for much of what kind of driving?
- Drowsy, fatigued driving
- Hesitant, uncertain driving
- Reckless, aggressive driving
- Distracted, careless driving
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Correct answer: Reckless, aggressive driving
The handbook says alcohol combined with anger is responsible for much of the reckless, aggressive driving that often causes fatal highway crashes.
Source: Idaho Driver's Handbook (July 2026), page 129 · Open this page in the manual (Manual page 129)
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By making you feel good, alcohol may give you what?
- Better judgment
- False confidence
- Sharper vision
- Faster reactions
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Correct answer: False confidence
The handbook says that by making you feel good, alcohol may also give you false confidence.
Source: Idaho Driver's Handbook (July 2026), page 129 · Open this page in the manual (Manual page 129)
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What do drinking drivers often think about driving at high speeds?
- That it will help them sober up
- That police cannot detect it
- That it is needed to keep up with traffic
- That they can drive safely at high speeds
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Correct answer: That they can drive safely at high speeds
Speeding is listed as a sign of drunken driving because drinking drivers often think they can drive safely at high speeds.
Source: Idaho Driver's Handbook (July 2026), page 130 · Open this page in the manual (Manual page 130)
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Even if a drinking driver stays in the lane, what trouble may the driver have?
- Steering straight
- Starting the engine
- Reading the speedometer
- Reaching the pedals
Show answer
Correct answer: Steering straight
Weaving is a sign of drunken driving: drivers may stay in their lane but have trouble steering straight.
Source: Idaho Driver's Handbook (July 2026), page 130 · Open this page in the manual (Manual page 130)
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Why might a drinking driver drive slower than normal traffic?
- The driver is trying to sober up
- The driver cannot read the speedometer
- The driver may be overly cautious
- The driver always obeys the posted limit
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Correct answer: The driver may be overly cautious
Slow driving is listed as a sign of drunken driving because drinking drivers may be overly cautious and drive slower than normal traffic.
Source: Idaho Driver's Handbook (July 2026), page 130 · Open this page in the manual (Manual page 130)
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A driver steers or accelerates in a jerky way. What does the handbook say this may reveal in a drinking driver?
- A mechanical steering problem
- Short mental lapses
- A wish to pass other traffic
- Poor road conditions ahead
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Correct answer: Short mental lapses
Drinking drivers often have short mental lapses revealed by jerky steering or acceleration.
Source: Idaho Driver's Handbook (July 2026), page 130 · Open this page in the manual (Manual page 130)
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How may a drinking driver stop at traffic signs or lights?
- Very gradually, well ahead of them
- Only after checking the mirrors twice
- By rolling through at a low speed
- Suddenly, rather than easing up to them
Show answer
Correct answer: Suddenly, rather than easing up to them
Quick stops are a sign of drunken driving: drivers may make sudden stops at traffic signs or lights rather than easing up to them.
Source: Idaho Driver's Handbook (July 2026), page 130 · Open this page in the manual (Manual page 130)
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Idaho's open container law prohibits who from drinking or possessing an open container of alcohol in a vehicle?
- Both drivers and passengers
- Drivers only
- Passengers only
- Only drivers who are under 21
Show answer
Correct answer: Both drivers and passengers
The open container law prohibits both drivers and passengers from drinking or possessing an open beverage container of alcohol.
Source: Idaho Driver's Handbook (July 2026), page 130 · Open this page in the manual (Manual page 130)