South Carolina General Knowledge Practice Test

This is our South Carolina 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 two main causes of tire fires are ______ and ______.

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

Question 2

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 3

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

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

Question 4

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

A	Load more weight over the drive axle for better traction.
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 cargo toward the rear of the truck for easier unloading.

Question 5

Any flatbed load must have at least ______ tie downs.

A	one
B	three
C	four
D	two

Question 6

Rust around a lug nut is a sign that:

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

Question 7

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

Question 8

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 9

______ can cause a fire.

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

Question 10

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

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

Question 11

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

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

Question 12

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

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

Question 13

The reason placards are used is:

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

Question 14

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

Question 15

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

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

Question 16

With regard to safe driving, what does communicating mean?

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

Question 17

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 two.
D	A minimum of one.

Question 18

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 being hauled at high speed.
D	the trailer is out of brake adjustment.

Question 19

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

Question 20

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 21

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

Question 22

A pre-trip inspection should be completed:

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

Question 23

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 24

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 25

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

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

Question 26

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 tank baffles are not always legal with outage.
C	Because some of the heaviest liquids don’t need any.
D	Because it's good to know that information.

Question 27

The two driving conditions in which you should downshift are:

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

Question 28

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

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

Question 29

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 30

If you become sleepy while driving, you should:

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

Question 31

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

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

Question 32

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

Question 33

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	testing the trailer brakes after hooking up to a trailer.
D	you will be parked for a short time.

Question 34

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	depends on the service brakes being in adjustment.
D	decreases when the service breaks are hot.

Question 35

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 36

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

Question 37

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

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

Question 38

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	keep two hands firmly planted on the steering wheel at all times.
D	downshift into the turn.

Question 39

Empty trucks ______.

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

Question 40

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

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

Question 41

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 42

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

Question 43

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	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	Push the brake pedal firmly 5 seconds; listen for leaks.

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

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, reaction distance, and braking distance.
D	Perception distance, slowing distance, and braking distance.

Question 46

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

A	three times
B	two times
C	half
D	four times

Question 47

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

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

Question 48

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 49

Wheel bearing seals should be checked for ______.

A	leaks
B	rubbing
C	burning
D	rust

Question 50

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 on a dry road.
C	The same amount of space you would at night.
D	One vehicle length for every 10,000 lb. of gross vehicle weight.

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"Dude, Go Back to Truck Driving School" because you FAILED!

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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

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 2

You know your brakes are fading when:

A	you release pressure on the brake pedal and speed increases.
B	the brake pedal feels firm when you apply pressure.
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 3

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	because law enforcement may inspect your vehicle on the road.
D	to help ensure the vehicle will make it to your destination.

Question 4

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

A	Downshift after you are in 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	Slow to a safe speed before the curve.

Question 5

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

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

Question 6

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

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

Question 7

Serious vehicle skids are usually caused by:

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

Question 8

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

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

Question 9

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	you want to avoid doing something all of a sudden.
C	you want to have a plan to communicate the risk.
D	it is a federal law.

Question 10

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

Question 11

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

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

Question 12

Containerized loads are:

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

Question 13

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

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

Question 14

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 15

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

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

Question 16

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 17

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

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

Question 18

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	none of these.
D	three or more.

Question 19

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

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

Question 20

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 21

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

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

Question 22

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

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

Question 23

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 24

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 25

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	keep two hands firmly planted on the steering wheel at all times.
D	downshift into the turn.

Question 26

Any flatbed load must have at least ______ tie downs.

A	two
B	three
C	one
D	four

Question 27

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 28

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 29

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 30

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 31

The reason placards are used is:

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

Question 32

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 33

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 34

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 five degrees.
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 35

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

A	two times
B	three times
C	half
D	four times

Question 36

A pre-trip inspection should be completed:

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

Question 37

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	Move forward slowly and push firmly on the brake pedal.
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 38

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	Warn other drivers by using your left turn signal lights.
C	Keep your low beam lights on.
D	Turn on your 4-way emergency flashers to warn other drivers.

Question 39

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

Question 40

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 41

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

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

Question 42

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

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

Question 43

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	One vehicle length for every 10,000 lb. of gross vehicle weight.
C	The same amount of space you would at night.
D	The same amount of space you would on a dry road.

Question 44

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 45

______ can cause a fire.

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

Question 46

Wheel bearing seals should be checked for ______.

A	rubbing
B	burning
C	leaks
D	rust

Question 47

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 more weight over the drive axle for better traction.
C	Load cargo toward the rear of the truck for easier unloading.
D	Load cargo weight evenly over all the axles.

Question 48

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

Question 49

If you become sleepy while driving, you should:

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

Question 50

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 lower gear than you would use to climb the hill.
D	Use a higher gear than you would use to climb the hill.

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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"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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