Ohio General Knowledge Practice Test

This is our Ohio General Knowledge Practice Quiz and Practice Test compiled of 50 questions each. Each question is worth two points for a total of 100 possible points. A passing score is 80%.

The General Knowledge Practice Quiz reveals the correct answer during each question to help you study for the actual General Knowledge test. The General Knowledge Practice Test doesn’t reveal the correct answers until the test is over.

The questions and answers are given in random order each time you retake the test. When you are finished testing, simply click on the “Get Results” button to see your test results. Clicking on the blue “List” button will reveal a list of all the questions you answered correctly and incorrectly. To take the test again, just refresh your browser window. It’s that easy. 

Press the start button to begin your free General Knowledge Practice Quiz. Good luck!

General Knowledge CDL Practice Quiz

Start

Congratulations! You have completed the General Knowledge CDL Practice Quiz. You scored %%SCORE%% out of %%TOTAL%%. Your performance has been rated as %%RATING%% Pass your CDL Knowledge Exam the first time! Click here to get the Complete CDL Cheat Sheet Study Package for all 50 states!

Your answers are highlighted below.

Question 1

The trailer hand valve (also called the trolley valve or Johnson bar) should only be used when:

A	there is ice and snow, to prevent skidding.
B	you will be parked for a short time.
C	testing the trailer brakes after hooking up to a trailer.
D	it is absolutely necessary.

Question 2

Two things a driver can do to prevent a rollover are, to go slow around turns, and also:

A	keep two hands firmly planted on the steering wheel at all times.
B	keep the cargo as close to the ground as possible.
C	downshift into the turn.
D	check to make sure that the brakes are properly balanced.

Question 3

The most important reason for conducting a pre-trip inspection of your vehicle is:

A	because law enforcement may inspect your vehicle on the road.
B	because it is a requirement for all drivers.
C	to help ensure the vehicle will make it to your destination.
D	to ensure safety for yourself, your passengers, and other drivers.

Question 4

Your stopping distance will increase by ______, if you double your speed.

A	three times
B	two times
C	four times
D	half

Question 5

The minimum tread depth that front tires should have for safety is:

A	4/32-inch in every major groove.
B	2/32-inch in every major groove.
C	5/32-inch in every major groove.
D	3/32-inch in every major groove.

Question 6

How many red reflective triangles should be in your vehicle's emergency equipment?

A	A minimum of one.
B	A minimum of four.
C	A minimum of three.
D	A minimum of two.

Question 7

Rust around a lug nut is a sign that:

A	the lug nut is cheap.
B	the wheel needs cleaning.
C	the lug nut needs to be replaced.
D	the lug nut is loose.

Question 8

What happens as a person's Blood Alcohol Concentration (BAC) goes up?

A	All of these things happen.
B	The drinker's brain is increasingly affected.
C	Judgment and self-control are the first to be affected.
D	Muscle control and coordination are affected.

Question 9

Empty trucks ______.

A	have the same stopping distance as full trucks
B	need less space ahead than full trucks
C	have better traction when stopping than full trucks
D	require greater stopping distance than full trucks

Question 10

A trailer is more likely to swing around when the trailer wheels lock up when:

A	the trailer is empty or lightly loaded.
B	the trailer is being hauled at high speed.
C	the trailer is out of brake adjustment.
D	the trailer is fully loaded or very heavy.

Question 11

You are exiting a highway using an offramp that curves downhill and you are driving a heavy vehicle. What should you do?

A	Slow to a safe speed before the curve.
B	Nothing, because the posted speed limit for the offramp is usually 10 miles per hour below the safe speed limit for the offramp.
C	Downshift after you are in the curve.
D	Turn on your four-way flashers as you approach the offramp.

Question 12

The two main causes of tire fires are ______ and ______.

A	under-inflated tires, dual tires that touch
B	over-heated brakes, under-inflated tires
C	poor-quality retreads, under-inflated tires
D	dual tires that touch, hot road surfaces

Question 13

The amount of liquid to load into a tank depends on:

A	neither of these.
B	the weight of the liquid.
C	the legal weight limits.
D	both of these.

Question 14

Due to its size, if your vehicle cannot make a right turn without swinging into another lane, you should ______ to prevent others from passing you on the right.

A	turn wide as you complete the turn
B	turn right and drive over the curb
C	turn wide before you start the turn
D	start the turn, then back up to re-position

Question 15

Your ______ are the most important way to see the sides and rear of your vehicle.

A	rolled down windows
B	mirrors
C	rear view cameras
D	sunglasses

Question 16

When loading cargo, what is an important rule to remember?

A	Load more weight over the drive axle for better traction.
B	Load cargo toward the rear of the truck for easier unloading.
C	Load cargo weight evenly over all the axles.
D	Load more cargo toward the front of the truck for a full load.

Question 17

You should make emergency plans when you see a hazard because:

A	you want to have time to act before it turns into an emergency.
B	it is a federal law.
C	you want to avoid doing something all of a sudden.
D	you want to have a plan to communicate the risk.

Question 18

If you become sleepy while driving, you should:

A	roll down the windows.
B	slap yourself in the face three times.
C	stop to sleep.
D	turn up the radio.

Question 19

The reason placards are used is:

A	to avoid mixing hazmat with food.
B	to combat terrorism.
C	to warn others of hazardous materials.
D	to make your vehicle look official.

Question 20

A pre-trip inspection should be completed:

A	if any problems occurred the last the time the vehicle was operated.
B	at least once a week.
C	whenever you stop to refuel.
D	before operating the vehicle.

Question 21

Why should know the outage needed for the liquids you carry?

A	Because tank baffles are not always legal with outage.
B	Because it's good to know that information.
C	Because some liquids expand more than others when they get warm.
D	Because some of the heaviest liquids don’t need any.

Question 22

While doing the pre-trip inspection on your vehicle's steering and exhaust system you found the following problems. Which one, if any, should be fixed before you drive the vehicle?

A	Too many vertical stacks.
B	Play in the steering wheel of more than ten degrees (two inches on a 20-inch steering wheel).
C	Oil on the tie rod.
D	Play in the steering wheel of more than five degrees.

Question 23

Before backing under, when coupling a semi-trailer to your tractor, the trailer is at the right height when:

A	the end of the kingpin is even with the top of the fifth wheel.
B	the end of the kingpin is at waist level.
C	the kingpin is about 1¼ inches above the fifth wheel.
D	it will be raised slightly when the tractor is backed under it.

Question 24

The correct term for a long commercial vehicle's tendency to swing wide on turns is:

A	sidetracking.
B	slidetracking.
C	fishtailing.
D	offtracking.

Question 25

Serious vehicle skids are usually caused by:

A	bad tires.
B	driving too fast for road conditions.
C	driving too slow for road conditions.
D	poorly adjusted brakes.

Question 26

Which of the following fires can be safely extinguished by water?

A	Electrical fire.
B	None of these fires can be safely extinguished by water.
C	Gasoline fire.
D	Grease fire.

Question 27

When checking the adjustment on air brakes, slack adjusters should have ______ of travel.

A	two inches
B	one inch
C	three inches
D	one half inch

Question 28

Which of the following is considered a hazard?

A	Road construction zones.
B	A stopped transit bus.
C	Pedestrians and bicyclists.
D	All of these are considered a hazard.

Question 29

Before transporting a sealed load, it is important to check that the:

A	load is properly secured.
B	seal is authentic.
C	seal is secure.
D	placard numbers match the seal numbers.

Question 30

You are operating a new truck with a manual transmission and are about to drive down a long, steep downhill grade? What should you do?

A	Use the same gear you would use to climb the hill.
B	Use a lower gear than you would use to climb the hill.
C	Use a higher gear than you would use to climb the hill.
D	Shift the truck into neutral and coast down the hill to save gas.

Question 31

If your vehicle has a retarder, you should turn it off when:

A	the road is wet, icy, or snow covered.
B	road conditions are excellent.
C	you are driving on the freeway.
D	you are driving on hilly, rural roads.

Question 32

What three things add up to the total stopping distance for your vehicle?

A	Observation distance, reaction distance, and slowing distance.
B	Perception distance, slowing distance, and braking distance.
C	Perception distance, reaction distance, and braking distance.
D	Perception distance, response distance, and reaction distance.

Question 33

With regard to safe driving, what does communicating mean?

A	Using turn signals, 4-way flashers, headlights, and the horn.
B	Using your CB radio or cell phone to inform others.
C	Using a helper when backing up.
D	Using hand signals.

Question 34

When driving a slow-moving vehicle on a 2-lane highway, you must pull off at the first safe turnout when the number of vehicles behind you is:

A	five or more.
B	three or more.
C	seven or more.
D	none of these.

Question 35

Two main things to look for up ahead while driving are ______ and ______.

A	vehicles, traffic signs
B	truck stops, gas stations
C	tunnels, overpasses
D	law enforcement officers, detours

Question 36

When a coolant container is part of a pressurized system, you can:

A	use windshield washer fluid as coolant.
B	safely remove the radiator cap and add coolant while the engine is hot.
C	use only water in the cooling system.
D	check the coolant level of a hot engine.

Question 37

When backing your vehicle, why should you use a helper?

A	To watch for steering errors.
B	To see the blind spots you can't see.
C	To direct traffic away from you.
D	To prevent others from distracting you.

Question 38

The two driving conditions in which you should downshift are:

A	before starting down a hill and before entering a tunnel.
B	before starting down a hill and before going up a hill.
C	before starting down a hill and before entering a curve.
D	before going up a hill and before entering a curve.

Question 39

When you are driving at night, you should:

A	make sure you are driving slow enough so you can stop within the range of your headlights in case of an emergency.
B	keep your high beams on at all times.
C	drink coffee or other caffeine products to help keep you awake.
D	roll down your window so that the fresh air will help keep you awake.

Question 40

Whenever you are parked at the side of the road at night, you must do which of the following?

A	Turn on your 4-way emergency flashers to warn other drivers.
B	Keep your low beam lights on.
C	Warn other drivers by using your left turn signal lights.
D	Put your warning devices out within 15 minutes.

Question 41

You know your brakes are fading when:

A	there is a slight vibration when you press down on the brake pedal.
B	you have to push harder and harder to get the same stopping power on a downgrade.
C	the brake pedal feels firm when you apply pressure.
D	you release pressure on the brake pedal and speed increases.

Question 42

The braking power of the spring brakes:

A	increases when the service brakes are hot.
B	is not affected by the condition of the service brakes.
C	decreases when the service breaks are hot.
D	depends on the service brakes being in adjustment.

Question 43

How much stopping distance does a light, empty truck require, compared to the same truck fully loaded and heavy?

A	It depends on what mood you are in at the time.
B	Shorter stopping distance.
C	Greater stopping distance.
D	The same amount of stopping distance.

Question 44

Which of the following methods should you use to test hydraulic brakes for leaks?

A	Push the brake pedal firmly 5 seconds; listen for leaks.
B	Pump the brake pedal 3 times; push the pedal firmly 5 seconds; the pedal should not move.
C	Move forward slowly and push firmly on the brake pedal.
D	Pump the brake pedal 5 times; push the pedal firmly 3 seconds; the pedal should not move.

Question 45

When driving on a slippery road during the day, how much space should you keep ahead of your truck?

A	The same amount of space you would at night.
B	One vehicle length for every 10,000 lb. of gross vehicle weight.
C	More space than is needed for ideal driving conditions.
D	The same amount of space you would on a dry road.

Question 46

Wheel bearing seals should be checked for ______.

A	leaks
B	rust
C	burning
D	rubbing

Question 47

Any flatbed load must have at least ______ tie downs.

A	three
B	four
C	one
D	two

Question 48

Containerized loads are:

A	exempt from hazardous materials restrictions.
B	exempt from weight limit restrictions.
C	generally used when freight is carried part way by rail or ship.
D	exempt from height restrictions.

Question 49

One reason why dry bulk tanks require special care is because:

A	the load can catch fire easily.
B	the load should not get wet.
C	the load can shift.
D	a dry bulk tank should only be filled halfway.

Question 50

______ can cause a fire.

A	under inflated tires
B	both loose fuel connections and under inflated tires
C	loose fuel connections
D	eating spicy food in the truck cab

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Remember, the General Knowledge Practice Test doesn’t reveal the correct answers until the test is over. The questions and answers are given in random order each time you retake the test. When you are finished testing, simply click on the “Get Results” button to see your test results. Clicking on the blue “List” button will reveal a list of all the questions you answered correctly and incorrectly. To take the test again, just refresh your browser window.

Press the start button to begin your free General Knowledge Practice Test. Good luck!

General Knowledge CDL Practice Test

Start

Congratulations! You have completed the General Knowledge CDL Practice Test. You scored %%SCORE%% out of %%TOTAL%%. Your performance has been rated as %%RATING%% Pass your CDL Knowledge Exam the first time! Click here to get the Complete CDL Cheat Sheet Study Package for all 50 states!

Your answers are highlighted below.

Question 1

The two driving conditions in which you should downshift are:

A	before starting down a hill and before entering a tunnel.
B	before starting down a hill and before entering a curve.
C	before going up a hill and before entering a curve.
D	before starting down a hill and before going up a hill.

Question 2

Whenever you are parked at the side of the road at night, you must do which of the following?

A	Turn on your 4-way emergency flashers to warn other drivers.
B	Put your warning devices out within 15 minutes.
C	Keep your low beam lights on.
D	Warn other drivers by using your left turn signal lights.

Question 3

The correct term for a long commercial vehicle's tendency to swing wide on turns is:

A	slidetracking.
B	offtracking.
C	sidetracking.
D	fishtailing.

Question 4

How many red reflective triangles should be in your vehicle's emergency equipment?

A	A minimum of four.
B	A minimum of three.
C	A minimum of one.
D	A minimum of two.

Question 5

You are exiting a highway using an offramp that curves downhill and you are driving a heavy vehicle. What should you do?

A	Slow to a safe speed before the curve.
B	Turn on your four-way flashers as you approach the offramp.
C	Nothing, because the posted speed limit for the offramp is usually 10 miles per hour below the safe speed limit for the offramp.
D	Downshift after you are in the curve.

Question 6

Which of the following methods should you use to test hydraulic brakes for leaks?

A	Pump the brake pedal 3 times; push the pedal firmly 5 seconds; the pedal should not move.
B	Push the brake pedal firmly 5 seconds; listen for leaks.
C	Move forward slowly and push firmly on the brake pedal.
D	Pump the brake pedal 5 times; push the pedal firmly 3 seconds; the pedal should not move.

Question 7

Rust around a lug nut is a sign that:

A	the lug nut is loose.
B	the wheel needs cleaning.
C	the lug nut needs to be replaced.
D	the lug nut is cheap.

Question 8

Before backing under, when coupling a semi-trailer to your tractor, the trailer is at the right height when:

A	it will be raised slightly when the tractor is backed under it.
B	the kingpin is about 1¼ inches above the fifth wheel.
C	the end of the kingpin is even with the top of the fifth wheel.
D	the end of the kingpin is at waist level.

Question 9

Serious vehicle skids are usually caused by:

A	poorly adjusted brakes.
B	bad tires.
C	driving too slow for road conditions.
D	driving too fast for road conditions.

Question 10

What three things add up to the total stopping distance for your vehicle?

A	Perception distance, reaction distance, and braking distance.
B	Perception distance, slowing distance, and braking distance.
C	Observation distance, reaction distance, and slowing distance.
D	Perception distance, response distance, and reaction distance.

Question 11

Wheel bearing seals should be checked for ______.

A	rubbing
B	burning
C	leaks
D	rust

Question 12

What happens as a person's Blood Alcohol Concentration (BAC) goes up?

A	The drinker's brain is increasingly affected.
B	All of these things happen.
C	Muscle control and coordination are affected.
D	Judgment and self-control are the first to be affected.

Question 13

While doing the pre-trip inspection on your vehicle's steering and exhaust system you found the following problems. Which one, if any, should be fixed before you drive the vehicle?

A	Oil on the tie rod.
B	Play in the steering wheel of more than ten degrees (two inches on a 20-inch steering wheel).
C	Too many vertical stacks.
D	Play in the steering wheel of more than five degrees.

Question 14

If you become sleepy while driving, you should:

A	stop to sleep.
B	turn up the radio.
C	roll down the windows.
D	slap yourself in the face three times.

Question 15

When you are driving at night, you should:

A	make sure you are driving slow enough so you can stop within the range of your headlights in case of an emergency.
B	drink coffee or other caffeine products to help keep you awake.
C	roll down your window so that the fresh air will help keep you awake.
D	keep your high beams on at all times.

Question 16

You should make emergency plans when you see a hazard because:

A	you want to avoid doing something all of a sudden.
B	you want to have a plan to communicate the risk.
C	it is a federal law.
D	you want to have time to act before it turns into an emergency.

Question 17

A pre-trip inspection should be completed:

A	at least once a week.
B	before operating the vehicle.
C	if any problems occurred the last the time the vehicle was operated.
D	whenever you stop to refuel.

Question 18

______ can cause a fire.

A	underinflated tires
B	overinflated tires
C	both loose fuel connections and under inflated tires
D	loose fuel connections

Question 19

You are operating a new truck with a manual transmission and are about to drive down a long, steep downhill grade? What should you do?

A	Use the same gear you would use to climb the hill.
B	Use a lower gear than you would use to climb the hill.
C	Shift the truck into neutral and coast down the hill to save gas.
D	Use a higher gear than you would use to climb the hill.

Question 20

When a coolant container is part of a pressurized system, you can:

A	use windshield washer fluid as coolant.
B	safely remove the radiator cap and add coolant while the engine is hot.
C	check the coolant level of a hot engine.
D	use only water in the cooling system.

Question 21

Containerized loads are:

A	generally used when freight is carried part way by rail or ship.
B	exempt from height restrictions.
C	exempt from weight limit restrictions.
D	exempt from hazardous materials restrictions.

Question 22

How much stopping distance does a light, empty truck require, compared to the same truck fully loaded and heavy?

A	The same amount of stopping distance.
B	It depends on what mood you are in at the time.
C	Shorter stopping distance.
D	Greater stopping distance.

Question 23

You know your brakes are fading when:

A	the brake pedal feels firm when you apply pressure.
B	you have to push harder and harder to get the same stopping power on a downgrade.
C	you release pressure on the brake pedal and speed increases.
D	there is a slight vibration when you press down on the brake pedal.

Question 24

One reason why dry bulk tanks require special care is because:

A	a dry bulk tank should only be filled halfway.
B	the load should not get wet.
C	the load can shift.
D	the load can catch fire easily.

Question 25

When loading cargo, what is an important rule to remember?

A	Load more weight over the drive axle for better traction.
B	Load cargo toward the rear of the truck for easier unloading.
C	Load cargo weight evenly over all the axles.
D	Load more cargo toward the front of the truck for a full load.

Question 26

Why should know the outage needed for the liquids you carry?

A	Because some of the heaviest liquids don’t need any.
B	Because some liquids expand more than others when they get warm.
C	Because it's good to know that information.
D	Because tank baffles are not always legal with outage.

Question 27

Before transporting a sealed load, it is important to check that the:

A	load is properly secured.
B	seal is secure.
C	placard numbers match the seal numbers.
D	seal is authentic.

Question 28

The trailer hand valve (also called the trolley valve or Johnson bar) should only be used when:

A	it is absolutely necessary.
B	testing the trailer brakes after hooking up to a trailer.
C	there is ice and snow, to prevent skidding.
D	you will be parked for a short time.

Question 29

A trailer is more likely to swing around when the trailer wheels lock up when:

A	the trailer is being hauled at high speed.
B	the trailer is empty or lightly loaded.
C	the trailer is fully loaded or very heavy.
D	the trailer is out of brake adjustment.

Question 30

Empty trucks ______.

A	require greater stopping distance than full trucks
B	have better traction when stopping than full trucks
C	have the same stopping distance as full trucks
D	need less space ahead than full trucks

Question 31

Your stopping distance will increase by ______, if you double your speed.

A	four times
B	two times
C	half
D	three times

Question 32

If your vehicle has a retarder, you should turn it off when:

A	you are driving on hilly, rural roads.
B	the road is wet, icy, or snow covered.
C	road conditions are excellent.
D	you are driving on the freeway.

Question 33

The two main causes of tire fires are ______ and ______.

A	under-inflated tires, dual tires that touch
B	over-heated brakes, under-inflated tires
C	dual tires that touch, hot road surfaces
D	poor-quality retreads, under-inflated tires

Question 34

The amount of liquid to load into a tank depends on:

A	the legal weight limits.
B	neither of these.
C	both of these.
D	the weight of the liquid.

Question 35

When driving on a slippery road during the day, how much space should you keep ahead of your truck?

A	One vehicle length for every 10,000 lb. of gross vehicle weight.
B	The same amount of space you would on a dry road.
C	More space than is needed for ideal driving conditions.
D	The same amount of space you would at night.

Question 36

Any flatbed load must have at least ______ tie downs.

A	one
B	two
C	four
D	three

Question 37

With regard to safe driving, what does communicating mean?

A	Using hand signals.
B	Using a helper when backing up.
C	Using turn signals, 4-way flashers, headlights, and the horn.
D	Using your CB radio or cell phone to inform others.

Question 38

When backing your vehicle, why should you use a helper?

A	To watch for steering errors.
B	To direct traffic away from you.
C	To prevent others from distracting you.
D	To see the blind spots you can't see.

Question 39

Which of the following fires can be safely extinguished by water?

A	Grease fire.
B	Gasoline fire.
C	Electrical fire.
D	None of these fires can be safely extinguished by water.

Question 40

Two things a driver can do to prevent a rollover are, to go slow around turns, and also:

A	check to make sure that the brakes are properly balanced.
B	keep the cargo as close to the ground as possible.
C	downshift into the turn.
D	keep two hands firmly planted on the steering wheel at all times.

Question 41

When driving a slow-moving vehicle on a 2-lane highway, you must pull off at the first safe turnout when the number of vehicles behind you is:

A	seven or more.
B	five or more.
C	three or more.
D	none of these.

Question 42

When checking the adjustment on air brakes, slack adjusters should have ______ of travel.

A	two inches
B	three inches
C	one half inch
D	one inch

Question 43

The minimum tread depth that front tires should have for safety is:

A	5/32-inch in every major groove.
B	2/32-inch in every major groove.
C	4/32-inch in every major groove.
D	3/32-inch in every major groove.

Question 44

The braking power of the spring brakes:

A	increases when the service brakes are hot.
B	depends on the service brakes being in adjustment.
C	is not affected by the condition of the service brakes.
D	decreases when the service breaks are hot.

Question 45

Your ______ are the most important way to see the sides and rear of your vehicle.

A	sunglasses
B	rear view cameras
C	mirrors
D	rolled down windows

Question 46

The most important reason for conducting a pre-trip inspection of your vehicle is:

A	because law enforcement may inspect your vehicle on the road.
B	to ensure safety for yourself, your passengers, and other drivers.
C	because it is a requirement for all drivers.
D	to help ensure the vehicle will make it to your destination.

Question 47

Which of the following is considered a hazard?

A	A stopped transit bus.
B	Road construction zones.
C	Pedestrians and bicyclists.
D	All of these are considered a hazard.

Question 48

The reason placards are used is:

A	to combat terrorism.
B	to warn others of hazardous materials.
C	to avoid mixing hazmat with food.
D	to make your vehicle look official.

Question 49

Due to its size, if your vehicle cannot make a right turn without swinging into another lane, you should ______ to prevent others from passing you on the right.

A	turn right and drive over the curb
B	turn wide as you complete the turn
C	start the turn, then back up to re-position
D	turn wide before you start the turn

Question 50

Two main things to look for up ahead while driving are ______ and ______.

A	vehicles, traffic signs
B	law enforcement officers, detours
C	tunnels, overpasses
D	truck stops, gas stations

Once you are finished, click the button below. Any items you have not completed will be marked incorrect. Get Results

There are 50 questions to complete.

←

List

→

Return

Shaded items are complete.

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36	37	38	39	40
41	42	43	44	45
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"Dude, Go Back to Truck Driving School" because you FAILED!

"A Bad Truck Driver" because you FAILED!

"An Amateur Truck Driver" because you FAILED! "An Amateur Truck Driver!"

"A Good Truck Driver" because you PASSED!

"A Truck Driving Pro" because you PASSED!

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