Driver's Permit Knowledge Test (Car) — All Questions
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In most states, what is the blood alcohol concentration (BAC) limit at which an adult 21 or older is considered legally impaired to drive?
- a.0.05%
- b.0.08%✓
- c.0.10%
- d.0.02%
The nationally standard legal limit for drivers 21 and older is 0.08% BAC; at or above this level you can be arrested for driving under the influence. However, impairment begins with the first drink, and you can be charged at lower levels if your driving is affected. Note that one state (Utah) uses a stricter 0.05% limit, so exact values can vary.
Under 'zero tolerance' laws, what BAC level can put a driver under 21 in violation?
- a.A very low level such as 0.01% or 0.02%✓
- b.Only 0.08% or higher
- c.0.05% exactly
- d.There is no limit for young drivers
Because drivers under 21 cannot legally drink, zero-tolerance laws set a very low BAC threshold, commonly 0.01% or 0.02% depending on the state. Even a small amount of alcohol can trigger a license suspension for a minor. The safest and only legal choice for anyone under 21 is to drive with a BAC of zero.
What does the 'implied consent' law mean when you drive on public roads?
- a.You agree to let anyone borrow your car
- b.You promise never to drink alcohol
- c.By driving, you agree to chemical testing if lawfully arrested for DUI✓
- d.You consent to random vehicle searches at any time
Implied consent means that by choosing to drive on public roads, you have already agreed to submit to breath, blood, or urine testing if you are lawfully arrested for driving under the influence. Refusing the test typically results in an automatic license suspension, often longer than the penalty for failing it. This law helps enforce impaired-driving statutes.