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These 10 free MO-CDL questions are organized by exam domain, so you can see how each part of the Missouri CDL Permit Test (MO-CDL) blueprint is tested. Reveal the answer and explanation under each question.
A Missouri applicant will operate a tractor-semitrailer with a 33,000-pound GCWR. The semitrailer has a 14,000-pound GVWR, and the load requires no passenger or hazardous-materials endorsement. Which CDL class is required?
Correct answer: C - Class A
A front tire blows out at highway speed. The vehicle begins to pull toward the failed tire, but the lane ahead is clear. Which response gives the driver the best chance of maintaining control?
Correct answer: D - Hold the wheel firmly, avoid braking at first, then slow and pull off once stable
A 60-foot combination vehicle is traveling 55 mph on a dry road with normal visibility. Under the CDL following-distance rule, what gap should the driver maintain at minimum?
Correct answer: A - 7 seconds
During a pretrip air check on a tractor-semitrailer, the system is fully charged, the engine is off, the parking brakes are released, and the service brake is not applied. Pressure drops 2.7 psi in one minute after stabilizing. How should the driver interpret the result?
Correct answer: A - It passes the released-brake limit; continue the remaining air checks
A tractor-semitrailer passes its tug test. The release handle is seated and there is no gap between the apron and fifth wheel, but the jaws are wrapped around the kingpin head instead of the shank. What is the correct decision?
Correct answer: B - Uncouple and recouple; this is a false coupling
A shipping paper lists the four core elements as 'Acetone, UN1090, 3, II.' Which rewritten basic description uses the required order?
Correct answer: D - UN1090, Acetone, 3, II
At one facility, a vehicle is loaded with 700 pounds of Class 3 material and 700 pounds of Class 8 material. Both are Table 2 materials; there are no Table 1 or subsidiary-hazard triggers. Which placard may replace the two separate hazard placards?
Correct answer: B - DANGEROUS
A passenger bus is disabled entirely on a wide shoulder. There is no fire, smoke, fuel leak, or rollover risk, and fast traffic makes the roadside more dangerous than the secured bus interior. What is the best immediate passenger-safety decision?
Correct answer: C - Keep riders aboard, secure the bus, and set warning devices while help is arranged
A partly filled baffled tanker begins to feel unstable as it approaches a freeway ramp. Which fact should govern the driver's response?
Correct answer: A - Baffles reduce fore-and-aft surge, but side surge remains; slow before the ramp
After unloading at a route stop, a school-bus driver counted six students off but can see only five walking away. No student is visible in any mirror. What must happen before the bus moves?
Correct answer: B - Secure the bus, remove the key, and check around and underneath it
The MO-CDL exam also covers these domains. Drill them in the full free practice test:
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