#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

Serious vehicle skids are usually caused by:

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

Question 2

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

Question 3

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

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

Question 4

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

Question 5

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

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

Question 6

The braking power of the spring brakes:

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

Question 7

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

Question 8

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 of the heaviest liquids don’t need any.
D	Because some liquids expand more than others when they get warm.

Question 9

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 see the blind spots you can't see.
D	To prevent others from distracting you.

Question 10

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

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

Question 11

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

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

Question 12

Containerized loads are:

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

Question 13

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

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

Question 14

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

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

Question 15

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

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

Question 16

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	check the coolant level of a hot engine.
C	use only water in the cooling system.
D	use windshield washer fluid as coolant.

Question 17

The reason placards are used is:

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

Question 18

Empty trucks ______.

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

Question 19

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

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

Question 20

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	Move forward slowly and push firmly on the brake pedal.
C	Pump the brake pedal 5 times; push the pedal firmly 3 seconds; the pedal should not move.
D	Pump the brake pedal 3 times; push the pedal firmly 5 seconds; the pedal should not move.

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

Question 22

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

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

Question 23

Wheel bearing seals should be checked for ______.

A	rubbing
B	burning
C	rust
D	leaks

Question 24

Any flatbed load must have at least ______ tie downs.

A	three
B	four
C	one
D	two

Question 25

When you are driving at night, you should:

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

Question 26

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

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

Question 27

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 wide before you start the turn
C	turn right and drive over the curb
D	turn wide as you complete the turn

Question 28

______ 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

Question 29

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

A	half
B	two times
C	four times
D	three times

Question 30

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

Question 31

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

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

Question 32

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

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

Question 33

You know your brakes are fading when:

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

Question 34

Rust around a lug nut is a sign that:

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

Question 35

Which of the following is considered a hazard?

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

Question 36

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

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

Question 37

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

Question 38

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	you are driving on the freeway.
D	road conditions are excellent.

Question 39

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

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

Question 40

The two driving conditions in which you should downshift are:

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

Question 41

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 42

With regard to safe driving, what does communicating mean?

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

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	The same amount of stopping distance.
D	Greater stopping distance.

Question 44

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

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

Question 45

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	Warn other drivers by using your left turn signal lights.
D	Keep your low beam lights on.

Question 46

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

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

Question 47

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

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

Question 48

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	before operating the vehicle.
D	whenever you stop to refuel.

Question 49

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

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

Question 50

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.

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

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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

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

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

Question 2

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

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

Question 3

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

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

Question 4

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

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

Question 5

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

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

Question 6

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

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

Question 7

A pre-trip inspection should be completed:

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

Question 8

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

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

Question 9

Any flatbed load must have at least ______ tie downs.

A	four
B	three
C	two
D	one

Question 10

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

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

Question 11

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

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

Question 12

Empty trucks ______.

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

Question 13

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

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

Question 14

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	Play in the steering wheel of more than five degrees.
D	Oil on the tie rod.

Question 15

Wheel bearing seals should be checked for ______.

A	burning
B	rust
C	leaks
D	rubbing

Question 16

The reason placards are used is:

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

Question 17

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	Shift the truck into neutral and coast down the hill to save gas.
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	Use the same gear you would use to climb the hill.

Question 18

If you become sleepy while driving, you should:

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

Question 19

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 20

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

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

Question 21

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 end of the kingpin is even with the top of the fifth wheel.
C	the kingpin is about 1¼ inches above the fifth wheel.
D	the end of the kingpin is at waist level.

Question 22

With regard to safe driving, what does communicating mean?

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

Question 23

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

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

Question 24

______ can cause a fire.

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

Question 25

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 26

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	downshift into the turn.
D	keep the cargo as close to the ground as possible.

Question 27

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

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

Question 28

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	the brake pedal feels firm when you apply pressure.
D	you release pressure on the brake pedal and speed increases.

Question 29

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 30

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

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

Question 31

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

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

Question 32

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	it is absolutely necessary.
C	you will be parked for a short time.
D	testing the trailer brakes after hooking up to a trailer.

Question 33

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

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

Question 34

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

A	three times
B	four times
C	half
D	two times

Question 35

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

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

Question 36

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 37

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

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

Question 38

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

Question 39

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

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

Question 40

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 41

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 42

Which of the following is considered a hazard?

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

Question 43

The braking power of the spring brakes:

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

Question 44

Serious vehicle skids are usually caused by:

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

Question 45

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

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

Question 46

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	Move forward slowly and push firmly on the brake pedal.
C	Pump the brake pedal 3 times; push the pedal firmly 5 seconds; the pedal should not move.
D	Pump the brake pedal 5 times; push the pedal firmly 3 seconds; the pedal should not move.

Question 47

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	Slow to a safe speed before the curve.
C	Turn on your four-way flashers as you approach the offramp.
D	Downshift after you are in the curve.

Question 48

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 before you start the turn
C	turn wide as you complete the turn
D	start the turn, then back up to re-position

Question 49

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

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

Question 50

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

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

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
46	47	48	49	50
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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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