#1 CDL Practice Test General Knowledge for ALL 50 States – 2023 Update

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To help you prepare for the CDL General Knowledge test, we have created this practice test consisting of 50 questions. Each question is worth two points for a total of 100 possible points. A passing score is 80%. We have created both a General Knowledge Practice Quiz and a General Knowledge Practice Test.

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

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Congratulations! You have completed the General Knowledge CDL Practice Quiz. You scored %%SCORE%% out of %%TOTAL%%. Your performance has been rated as %%RATING%%

Your answers are highlighted below.

Question 1

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

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

Question 2

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

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

Question 3

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

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

Question 4

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

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

Question 5

Wheel bearing seals should be checked for ______.

A	leaks
B	rubbing
C	burning
D	rust

Question 6

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

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

Question 7

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

Question 8

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

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

Question 9

Rust around a lug nut is a sign that:

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

Question 10

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

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

Question 11

______ can cause a fire.

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

Question 12

Empty trucks ______.

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

Question 13

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

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

Question 14

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 at waist level.
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	it will be raised slightly when the tractor is backed under it.

Question 15

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

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

Question 16

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

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

Question 17

You know your brakes are fading when:

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

Question 18

The braking power of the spring brakes:

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

Question 19

Serious vehicle skids are usually caused by:

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

Question 20

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 21

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

A	four times
B	two times
C	three times
D	half

Question 22

With regard to safe driving, what does communicating mean?

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

Question 23

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

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

Question 24

A pre-trip inspection should be completed:

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

Question 25

Containerized loads are:

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

Question 26

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 starting down a hill and before going up a hill.
D	before going up a hill and before entering a curve.

Question 27

When you are driving at night, you should:

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

Question 28

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

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

Question 29

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 30

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

Question 31

If you become sleepy while driving, you should:

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

Question 32

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

A	Pump the brake pedal 5 times; push the pedal firmly 3 seconds; the pedal should not move.
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	Push the brake pedal firmly 5 seconds; listen for leaks.

Question 33

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

Question 34

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

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

Question 35

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

Question 36

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 two hands firmly planted on the steering wheel at all times.
C	keep the cargo as close to the ground as possible.
D	downshift into the turn.

Question 37

Any flatbed load must have at least ______ tie downs.

A	one
B	four
C	three
D	two

Question 38

Which of the following is considered a hazard?

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

Question 39

The reason placards are used is:

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

Question 40

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 41

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	you will be parked for a short time.
D	there is ice and snow, to prevent skidding.

Question 42

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 43

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 44

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 45

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

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

Question 46

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 47

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

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

Question 48

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

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

Question 49

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 tank baffles are not always legal with outage.
D	Because it's good to know that information.

Question 50

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

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

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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

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Congratulations! You have completed the General Knowledge CDL Practice Test. You scored %%SCORE%% out of %%TOTAL%%. Your performance has been rated as %%RATING%%

Your answers are highlighted below.

Question 1

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

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

Question 2

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

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

Question 3

Which of the following is considered a hazard?

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

Question 4

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

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

Question 5

When you are driving at night, you should:

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

Question 6

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	More space than is needed for ideal driving conditions.
C	The same amount of space you would on a dry road.
D	The same amount of space you would at night.

Question 7

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

Question 8

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

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

Question 9

______ can cause a fire.

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

Question 10

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

Question 11

The two driving conditions in which you should downshift are:

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

Question 12

You know your brakes are fading when:

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

Question 13

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

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

Question 14

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

A	three times
B	two times
C	four times
D	half

Question 15

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

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

Question 16

Containerized loads are:

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

Question 17

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

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

Question 18

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

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

Question 19

Rust around a lug nut is a sign that:

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

Question 20

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

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

Question 21

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

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

Question 22

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

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

Question 23

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

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

Question 24

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

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

Question 25

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

Question 26

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	3/32-inch in every major groove.
D	4/32-inch in every major groove.

Question 27

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	Judgment and self-control are the first to be affected.
D	Muscle control and coordination are affected.

Question 28

Wheel bearing seals should be checked for ______.

A	leaks
B	rust
C	burning
D	rubbing

Question 29

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	Greater stopping distance.
C	Shorter stopping distance.
D	It depends on what mood you are in at the time.

Question 30

The braking power of the spring brakes:

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

Question 31

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

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

Question 32

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

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

Question 33

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

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

Question 34

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

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

Question 35

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

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

Question 36

Empty trucks ______.

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

Question 37

If you become sleepy while driving, you should:

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

Question 38

With regard to safe driving, what does communicating mean?

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

Question 39

Any flatbed load must have at least ______ tie downs.

A	three
B	four
C	two
D	one

Question 40

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

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

Question 41

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	check to make sure that the brakes are properly balanced.
C	keep the cargo as close to the ground as possible.
D	downshift into the turn.

Question 42

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

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

Question 43

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 44

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

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

Question 45

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 out of brake adjustment.
C	the trailer is fully loaded or very heavy.
D	the trailer is empty or lightly loaded.

Question 46

A pre-trip inspection should be completed:

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

Question 47

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

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

Question 48

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

Question 49

Serious vehicle skids are usually caused by:

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

Question 50

The reason placards are used is:

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

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.

1	2	3	4	5
6	7	8	9	10
11	12	13	14	15
16	17	18	19	20
21	22	23	24	25
26	27	28	29	30
31	32	33	34	35
36	37	38	39	40
41	42	43	44	45
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Our free CDL practice tests have been created to work perfectly on high-end mobile devices, such as smart phones and tablets, as well as desktop computers so, feel free to take our CDL practice tests on your smart phone to refresh your memory while you are waiting in line at the DMV.

Below you will see links to state-specific CDL Cheat Sheets and CDL Help Guides that will guide you through the process of obtaining your Commercial Learner’s Permit and Commercial Driver’s License.

Here at Truck Driving Schools Info we give you the tools you need to “Know Before You Go!”.

Check out the CDL Exam Answer Sheets and CDL Help Guides available for all 50 states.

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