DMV

Iowa CDL Knowledge Test Sample Questions

Real, Iowa-specific sample questions from our practice question bank, with the correct answer, a full explanation, and a source reference for each. See our national sample questions for topics that apply to every state, or take the full Iowa cdl practice test to test yourself instead of just reading the answers.

General Driving Knowledge

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1. What is the fee for an Iowa commercial learner's permit (CLP)?

A$12
B$90
C$50
DThere is no fee at all
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2. How long is an Iowa CLP valid, and can it be renewed?

AValid 60 days, renewable indefinitely
BValid one year, with no renewal period
CValid 180 days, renewable once
DValid five years, renewable once
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3. What must an Iowa CDL applicant already hold before applying for a CLP?

ANo prior license of any kind is required
BA commercial license from another state
CA valid Iowa noncommercial Class C driver's license
DA motorcycle endorsement only, nothing further
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4. Roughly what does a full Iowa CDL cost, combining the CLP and CDL license fees?

A$28 ($12 CLP plus $16 CDL license)
B$150
C$5
DThere is no fee beyond the knowledge test itself
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5. What must an Iowa CDL applicant complete before applying for their first commercial driver's license?

ANo additional training; the knowledge test alone is sufficient
BA four-year commercial driving degree program
CFederal entry-level driver training (ELDT) through an authorized provider
DA separate state-only training program unrelated to federal ELDT
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6. What proof must an Iowa CDL applicant provide regarding citizenship or lawful presence?

AA certified birth certificate, passport, or similar document
BNo such proof is required in Iowa
CA verbal statement alone, with no documentation
DOnly a Social Security card, nothing else

More Questions

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7. Under federal hours-of-service rules that apply to Iowa CDL holders, how many hours of driving are allowed after 10 consecutive hours off duty?

AUp to 15 hours, with no separate on-duty window limit
BUp to 8 hours, regardless of the on-duty window
CUp to 11 hours, within a 14-hour on-duty window
DUnlimited hours as long as breaks are logged