🎧 50 audio-narrated practice questions

General Knowledge CDL Practice — Pass the 50-Question Test

The General Knowledge test is 50 questions — miss more than 10 and you fail.

Master CDL General Knowledge with 50 audio-narrated practice questions, adaptive review, and instant explanations.

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Why General Knowledge is tricky

General Knowledge is the one test every CDL applicant takes regardless of class or endorsement. Topics range from vehicle inspection to cargo securement to accident procedures — a lot of surface area.

4 study moves that actually work

1
The 80% pass mark means you can only miss 10 of 50. Memorize the unambiguous numbers (stopping distances, weight limits, hours-of-service windows).
2
Every wrong answer in Koydo CDL surfaces again the next session until you get it right twice in a row.
3
Parked-study audio lets you review 20 questions during breaks, before class, or off the road.
4
Focus study blocks on the Pre-Trip Inspection chapter; it overlaps heavily with General Knowledge and gives you double credit.

CDL sections

Audio

parked-study review

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What you get in the Koydo CDL app

🎧

Audio for every question

All 50 General Knowledge questions narrated for parked or off-road study.

🎯

Adaptive review

Missed questions resurface until you get them right twice.

✅

Free practice + Premium upgrade

Start with 15 free questions, then unlock Premium when you choose a plan.

FAQ — General Knowledge

How many General Knowledge questions does the DMV ask?

50 questions. You need 40 correct (80%) to pass. Koydo CDL mirrors this exactly.

Do I need to pass General Knowledge before any endorsement?

Yes. General Knowledge is the base test. All endorsements (Air Brakes, HazMat, Tanker, Doubles/Triples, Passenger, School Bus) require you to pass General Knowledge first.

Is the audio mode useful for General Knowledge?

Especially useful. The 50-question set takes about 25 minutes to listen through while parked, on break, or off the road.

Other CDL sections

Air Brakes →Combination Vehicles →Hazardous Materials →Doubles and Triples →Tanker Vehicles →Passenger Transport →School Bus →Pre-Trip Inspection →

Ready to pass General Knowledge?

Free practice first. Premium adds audio, adaptive review, state rules, and all 9 sections.

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4 study moves that actually work

The 80% pass mark means you can only miss 10 of 50. Memorize the unambiguous numbers (stopping distances, weight limits, hours-of-service windows).

Every wrong answer in Koydo CDL surfaces again the next session until you get it right twice in a row.

Parked-study audio lets you review 20 questions during breaks, before class, or off the road.

Focus study blocks on the Pre-Trip Inspection chapter; it overlaps heavily with General Knowledge and gives you double credit.