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300+ Free Ohio CDL General Knowledge Practice Questions

Pass your Ohio Commercial Driver License General Knowledge Test exam on the first try — instant access, no signup required.

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2026 Statistics

Key Facts: Ohio CDL General Knowledge Exam

80%

Minimum passing score for CDL knowledge tests

FMCSA / 49 CFR 383.135

At least 30

Minimum basic knowledge-test items

FMCSA States CDL Knowledge & Skills Test

12 months

Ohio CLP validity

Ohio BMV

$31.50

Ohio CDL temporary permit fee

Ohio BMV Fees

Ohio CDL applicants must pass required knowledge testing before receiving or upgrading CDL privileges. Ohio BMV directs applicants to driver exam stations for written tests, lists the Ohio CLP as valid for 12 months, and requires first-time CDL or CLP applicants to be at least 18, hold a valid Ohio driver license, provide required citizenship or permanent-residency proof, and self-certify driving type. Under FMCSA standards, the basic knowledge test covers the 20 general areas in 49 CFR 383.111(a), has at least 30 items, and requires at least 80% correct to pass. Ohio BMV lists a $31.50 CDL temporary permit and first CDL fees of $46.50 for 4 years or $92.00 for 8 years.

Sample Ohio CDL General Knowledge Practice Questions

Try these sample questions to test your Ohio CDL General Knowledge exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 300+ question experience with AI tutoring.

1What is the first step in the seven-step pre-trip inspection method?
A.Approach the vehicle and check its general condition
B.Check under the hood
C.Start the engine and inspect inside the cab
D.Walk around and inspect the entire vehicle
Explanation: The first step of the seven-step pre-trip inspection is to approach the vehicle and look at its general condition. This includes checking for damage, whether the vehicle is leaning to one side, and looking under the vehicle for fresh leaks of oil, coolant, grease, or fuel. This initial overview can immediately reveal serious problems before you invest time in a detailed inspection.
2During a pre-trip inspection, what should you check in the engine compartment?
A.Only the oil level
B.Oil level, coolant level, power steering fluid, belts, and hoses
C.Only the coolant level and belts
D.Only items visible without opening any caps
Explanation: A thorough engine compartment inspection includes checking the oil level, coolant level in the radiator, power steering fluid, condition of belts and hoses for wear or cracks, and looking for leaks. You should also check the alternator, water pump, air compressor, and any other belt-driven components. Checking only one or two items could mean missing a critical problem that leads to a breakdown or safety hazard on the road.
3When performing a pre-trip inspection, the driver should ensure that the steering wheel free play (lash) does not exceed what limit?
A.5 degrees in either direction
B.10 degrees in either direction (approximately 2 inches on a 20-inch wheel)
C.15 degrees in either direction
D.20 degrees in either direction
Explanation: Federal Motor Carrier Safety Regulations require that steering wheel free play (lash) not exceed 10 degrees in either direction, which translates to roughly 2 inches of movement on a 20-inch diameter steering wheel before the front wheels begin to turn. Excessive free play indicates worn steering components and can make precise steering difficult, especially in emergency maneuvers. A vehicle with excessive steering lash would be placed out of service.
4During the cab check portion of a pre-trip inspection, you should test the parking brake by:
A.Driving forward slowly and applying the parking brake
B.Putting the vehicle in gear with the parking brake set and gently pressing the accelerator to see if the vehicle holds
C.Visually checking that the parking brake handle is in the correct position
D.Checking the parking brake cable under the vehicle
Explanation: To properly test the parking brake, set the parking brake, put the vehicle in a low gear, and gently press the accelerator to see if the brake holds the vehicle in place. This functional test confirms the parking brake can actually prevent the vehicle from moving, which is essential for safety when parked on grades. A visual check alone is insufficient because it does not verify that the brake mechanism is actually functioning properly.
5Which emergency equipment is required to be on a commercial motor vehicle?
A.Fire extinguisher, spare fuses, and three red reflective triangles
B.First aid kit, fire extinguisher, and flares only
C.Fire extinguisher and road flares only
D.Spare tire, jack, and reflective vest
Explanation: Federal regulations require every commercial motor vehicle to carry a properly charged and rated fire extinguisher (minimum 5 B:C rating, or two 4 B:C extinguishers), spare electrical fuses (unless the vehicle has circuit breakers), and three red reflective warning triangles (or equivalent). These items are checked during inspections and roadside enforcement stops. A vehicle missing any of these required items can be cited for a violation.
6A post-trip inspection report is important because:
A.It is only required for vehicles carrying hazardous materials
B.It alerts the carrier to vehicle defects that may need repair before the vehicle is driven again
C.It replaces the need for the next driver to do a pre-trip inspection
D.It is optional but recommended by the FMCSA
Explanation: The post-trip inspection report (also called a DVIR, or Driver Vehicle Inspection Report) is required by FMCSA regulations (49 CFR 396.11). Its purpose is to document any defects or deficiencies discovered at the end of the trip so the carrier can arrange repairs before the vehicle is dispatched again. The next driver must review the previous post-trip report and verify that any noted defects have been repaired or certified as not needing repair. It does not replace the next driver's pre-trip inspection obligation.
7During a pre-trip inspection, the driver notices a coolant leak near the water pump. What should the driver do?
A.Note it on the report and drive carefully to the next service stop
B.Add more coolant and continue the trip
C.Do not drive the vehicle until the leak is repaired
D.Drive only short distances and monitor the temperature gauge
Explanation: A coolant leak is a serious defect that can lead to engine overheating and catastrophic engine failure. The vehicle should not be driven until the leak is repaired. Driving with a coolant leak risks engine damage, potential fire (if coolant contacts hot exhaust components), and could result in a roadside breakdown in an unsafe location. FMCSA regulations require that defects affecting safe operation be corrected before the vehicle is driven.
8Which of the following is an out-of-service condition that would prevent a vehicle from being driven?
A.A small crack in the windshield that does not obstruct the driver's view
B.A missing mud flap on a rear wheel
C.Brake lining thickness below the minimum allowed by regulations
D.A broken antenna on the CB radio
Explanation: Brake lining worn below the minimum thickness specified in FMCSA out-of-service criteria is a critical safety defect. The North American Standard Out-of-Service Criteria lists specific thresholds: brake lining must not be less than 1/4 inch thick at the thinnest point for air-braked vehicles. When brake linings are too thin, braking effectiveness is severely compromised, and the vehicle must be placed out of service until repairs are made. A small windshield crack not in the driver's view, a missing mud flap, or a broken CB antenna are defects but not typically out-of-service conditions.
9During the pre-trip inspection, which of the following should a driver check regarding the exhaust system?
A.Only that the muffler is present
B.That the exhaust system is secure, not leaking, and not in contact with fuel lines, wiring, or air lines
C.Only that exhaust fumes are not entering the cab
D.That the catalytic converter is functioning properly by checking emissions color
Explanation: When inspecting the exhaust system, the driver should verify that all components are properly mounted and secured, there are no leaks (which could allow poisonous carbon monoxide to enter the cab), and the exhaust system is not in contact with fuel supply lines, wiring, or air brake lines. Heat from the exhaust can damage these components, potentially causing fuel leaks, electrical fires, or brake failures. A complete exhaust system inspection goes beyond just checking for the presence of a muffler.
10What is the minimum tread depth required for steer axle tires on a commercial motor vehicle?
A.2/32 of an inch
B.4/32 of an inch
C.6/32 of an inch
D.1/32 of an inch
Explanation: Federal regulations require steer axle tires to have a minimum tread depth of 4/32 of an inch (approximately 3.2 mm) in every major groove. Steer tires have a higher minimum than other axle positions (which require only 2/32 of an inch) because the steer tires are critical for directional control of the vehicle. Tires below this minimum are considered unsafe and will result in a violation or out-of-service order during an inspection.

About the Ohio CDL General Knowledge Exam

The Ohio CDL General Knowledge Test is the base written knowledge exam for Ohio commercial learner permit and commercial driver license applicants. Ohio BMV administers CDL knowledge testing through Ohio driver exam stations using the Ohio Commercial Driver License Manual and federal FMCSA standards. FMCSA requires each basic CDL knowledge test to cover the 20 general areas in 49 CFR 383.111(a), contain at least 30 items, and require at least 80% correct to pass. The test emphasizes safe operation of commercial motor vehicles: vehicle inspection, basic control, shifting, speed and space management, seeing and communication, adverse conditions, emergencies and skids, railroad crossings, mountain driving, cargo securement, driver wellness and fatigue, alcohol and drug rules, and Ohio CDL licensing basics.

Assessment

Multiple-choice CDL knowledge test covering the basic general-knowledge areas required for commercial motor vehicle operators; Ohio also requires separate knowledge tests for each class, endorsement, and air-brake restriction removal when applicable.

Time Limit

Not published by Ohio BMV or FMCSA for the General Knowledge test; Ohio publishes separate skills-test time limits

Passing Score

At least 80% correct on each CDL knowledge test

Exam Fee

$31.50 CDL temporary permit; $46.50 first 4-year CDL or $92.00 first 8-year CDL; state-owned CDL skills test receipt is $10 pre-trip, $10 basic, and $30 road test (Ohio Bureau of Motor Vehicles (Ohio BMV))

Ohio CDL General Knowledge Exam Content Outline

Core general-knowledge area

Vehicle Inspection

Pre-trip, en-route, and post-trip checks; safety-critical components; emergency equipment; tires, brakes, lights, mirrors, and cargo checks.

Core general-knowledge area

Basic Vehicle Control and Mountain Driving

Starting, accelerating, steering, backing, turning, off-tracking, shifting, braking, curves, downgrades, and controlling a large commercial motor vehicle.

Core general-knowledge area

Speed, Space, Seeing, and Communication

Following distance, stopping distance, overhead clearance, turns, merging gaps, railroad crossings, mirror use, signaling, and hazard perception.

Core general-knowledge area

Night, Weather, Hazards, Emergencies, and Skids

Night visibility, fog, rain, hydroplaning, snow, ice, blowouts, skids, fires, crash response, escape ramps, and fatigue prevention.

Core general-knowledge area

Cargo Securement and Weight

Blocking and bracing, tie-down strength, cargo inspection intervals, sealed loads, weight distribution, and axle/GVW control.

Core general-knowledge area

FMCSA and Ohio CDL Basics

CDL classes, CLP/CDL application basics, medical self-certification, ELDT, drug and alcohol rules, disqualifications, Ohio fees, and Ohio BMV procedures.

How to Pass the Ohio CDL General Knowledge Exam

What You Need to Know

  • Passing score: At least 80% correct on each CDL knowledge test
  • Assessment: Multiple-choice CDL knowledge test covering the basic general-knowledge areas required for commercial motor vehicle operators; Ohio also requires separate knowledge tests for each class, endorsement, and air-brake restriction removal when applicable.
  • Time limit: Not published by Ohio BMV or FMCSA for the General Knowledge test; Ohio publishes separate skills-test time limits
  • Exam fee: $31.50 CDL temporary permit; $46.50 first 4-year CDL or $92.00 first 8-year CDL; state-owned CDL skills test receipt is $10 pre-trip, $10 basic, and $30 road test

Keys to Passing

  • Complete 500+ practice questions
  • Score 80%+ consistently before scheduling
  • Focus on highest-weighted sections
  • Use our AI tutor for tough concepts

Ohio CDL General Knowledge Study Tips from Top Performers

1Read the Ohio Commercial Driver License Manual first; practice questions should reinforce, not replace, the official manual.
2Master inspection language: know what to inspect, what defects matter, and when a vehicle is unsafe to operate.
3Separate General Knowledge from endorsement content; add air-brake, combination, passenger, school bus, tanker, doubles/triples, or hazmat study only when those tests apply.
4Review Ohio-specific logistics before test day: CLP validity, temporary permit and CDL fees, driver exam station testing, self-certification, and medical qualification steps.
5Practice mixed sets until you consistently exceed the federal 80% passing standard.
6For scenario misses, identify the underlying safety rule: speed, space, visibility, cargo movement, fatigue, impairment, or emergency control.

Frequently Asked Questions

Who administers the Ohio CDL General Knowledge Test?

Ohio BMV administers CDL knowledge testing through Ohio driver exam stations. Ohio BMV tells CDL applicants to visit any driver exam station in Ohio for written knowledge tests.

How many questions are on the Ohio CDL General Knowledge Test?

FMCSA requires each basic CDL knowledge test to contain at least 30 items. Ohio BMV states a knowledge test is required for each class of vehicle, each endorsement, and removal of the air-brake restriction, but the official Ohio CDL page does not publish a separate public General Knowledge item count.

What score do I need to pass?

FMCSA requires CDL applicants to correctly answer at least 80 percent of questions on each CDL knowledge test. Ohio testing must meet those federal minimum standards.

How much does Ohio CDL testing cost?

Ohio BMV lists a $31.50 CDL temporary permit. First Commercial Driver License fees are $46.50 for a 4-year credential or $92.00 for an 8-year credential. At a state-owned skills-testing facility, the CDL Test Receipt is $10 for pre-trip inspection, $10 for the basic test, and $30 for the road test; third-party skills-testing fees vary.

What should I study for Ohio CDL General Knowledge?

Study the Ohio Commercial Driver License Manual, especially general-knowledge content on inspection, basic control, shifting, speed and space, seeing and communication, adverse conditions, emergencies, cargo, fatigue, alcohol and drug rules, and CDL licensing requirements.

How long is an Ohio CLP valid?

Ohio BMV states that a Commercial Learner Permit is valid for 12 months. A CLP holder may operate a commercial motor vehicle on a highway only while driving with a properly endorsed CDL holder for that vehicle.