Alcohol concentration factors — North Dakota Permit Test
Alcohol concentration factors on the North Dakota permit test — 4 rules, each with the reason behind it and a question on it while it is fresh.
The rules
Three factors influence a person's alcohol concentration (AC): the alcohol content, the period of time over which it was consumed, and the person's lean body weight.
Knowing what raises your AC shows why two people drinking the same amount are not equally impaired.
Three factors influence a person’s AC:
In the average drink, the alcohol content is about the same in a 12-ounce can of beer, a 4-ounce glass of wine, or a 1-ounce glass of scotch or whiskey.
People think beer or wine is weaker than liquor, and drive after drinks that hold just as much alcohol.
In the “average drink” the alcohol content is about the same whether it’s a 12-ounce can of beer, a 4-ounce glass of wine, or a 1-ounce glass of scotch or whiskey.
Mixed drinks vary a great deal, and drinks at a private party tend to be quite a bit stronger.
A guest who counts drinks at a party can be far more impaired than the count suggests.
Drinks at a private party tend to be quite a bit stronger.
Time is the only way to eliminate alcohol from the bloodstream; drinking coffee, taking cold showers or exercising will not quicken it.
A driver who feels sobered by coffee is still just as impaired, and drives believing otherwise.
Time is the only way to eliminate alcohol from the blood stream.
On the test
Which of these is one of the 3 factors that influence a person's alcohol concentration?
The person's lean body weight. Knowing what raises your AC shows why two people drinking the same amount are not equally impaired. North Dakota Noncommercial Driver License Manual, p.35: “Three factors influence a person’s AC:”
How this works
Most practice tests hand you a bank of questions and leave the manual somewhere else. This one puts them together.
You read one law and the reason behind it, then answer a question on that law while it is still fresh. Get it right and you move on; get it wrong and you have found the gap while it is cheap to fix, not on the morning of the exam.
Learning one rule at a time, and proving it immediately, is what turns a manual you skimmed into something you actually know — and it makes studying feel like getting somewhere rather than like waiting to find out.
What it costs
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Where these come from
Every rule here is checked against North Dakota Noncommercial Driver License Manual, published by the North Dakota Department of Transportation, and against the state code itself. Last checked 2026-10-04.
- src/assets/drivers-manuals/ND.pdf (North Dakota Noncommercial Driver License Manual, 2025-2027, Revised 2025, North Dakota Department of Transportation, retrieved 2026-09-14 and re-checked 2026-10-04; sha256 pinned in SOURCES.json)
- src/assets/drivers-manuals/ND.pages.txt (the plain pdftotext fixture every citation here was cut from and verified against; sha256 pinned in SOURCES.json)
- https://www.dot.nd.gov/driver/noncommercial-driver-license-manual (read 2026-10-04; links the manual)
- https://www.dot.nd.gov/driver/driver-license (read 2026-10-04; states no count or mark for the Class D knowledge test)
- https://ndlegis.gov/information/acdata/pdf/37-03-01.pdf (N.D. Admin. Code chapter 37-03-01 and the rest of article 37-03, read 2026-10-04; states no knowledge-test figure)
- https://ndlegis.gov/cencode/t39c06.pdf (NDCC chapter 39-06, read 2026-10-04; section 39-06-13 sets what the examination covers and states no figure)