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

Any flatbed load must have at least ______ tie downs.

A	one
B	two
C	four
D	three

Question 2

Serious vehicle skids are usually caused by:

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

Question 3

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 4

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	Warn other drivers by using your left turn signal lights.
C	Keep your low beam lights on.
D	Put your warning devices out within 15 minutes.

Question 5

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

A	two times
B	three times
C	half
D	four times

Question 6

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 7

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 secure.
D	seal is authentic.

Question 8

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

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

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 cheap.
D	the lug nut is loose.

Question 10

The two driving conditions in which you should downshift are:

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

Question 11

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 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

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 14

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

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

Question 15

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

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

Question 16

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

Question 17

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 18

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 19

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 20

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

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

Question 21

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 22

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

A	Turn on your four-way flashers as you approach the offramp.
B	Downshift after you are in the curve.
C	Slow to a safe speed before 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 23

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

Question 24

When you are driving at night, you should:

A	drink coffee or other caffeine products to help keep you awake.
B	roll down your window so that the fresh air will 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 25

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

Question 26

Wheel bearing seals should be checked for ______.

A	rust
B	burning
C	leaks
D	rubbing

Question 27

Containerized loads are:

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

Question 28

A pre-trip inspection should be completed:

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

Question 29

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 30

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 31

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

Question 32

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

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

Question 33

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

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

Question 34

With regard to safe driving, what does communicating mean?

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

Question 35

If you become sleepy while driving, you should:

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

Question 36

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	Push the brake pedal firmly 5 seconds; listen for leaks.
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 37

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 should not get wet.
D	the load can shift.

Question 38

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	under-inflated tires, dual tires that touch
D	poor-quality retreads, under-inflated tires

Question 39

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 avoid doing something all of a sudden.
D	you want to have time to act before it turns into an emergency.

Question 40

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

Question 41

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 42

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

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

Question 43

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 44

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 45

Which of the following is considered a hazard?

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

Question 46

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 47

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

Question 48

______ can cause a fire.

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

Question 49

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

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

Question 50

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

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

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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

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

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

Question 2

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

A	four times
B	three times
C	half
D	two times

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

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 lower gear than you would use to climb the hill.
B	Use the same gear 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 5

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

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

Question 7

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	the road is wet, icy, or snow covered.
D	you are driving on the freeway.

Question 8

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	it is absolutely necessary.
C	there is ice and snow, to prevent skidding.
D	testing the trailer brakes after hooking up to a trailer.

Question 9

Any flatbed load must have at least ______ tie downs.

A	three
B	four
C	one
D	two

Question 10

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

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

Question 11

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	3/32-inch in every major groove.
D	5/32-inch in every major groove.

Question 12

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 13

The two driving conditions in which you should downshift are:

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

Question 14

______ can cause a fire.

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

Question 15

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

Question 16

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 17

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 18

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	you release pressure on the brake pedal and speed increases.
C	the brake pedal feels firm when you apply pressure.
D	there is a slight vibration when you press down on the brake pedal.

Question 19

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 20

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 two.
D	A minimum of three.

Question 21

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 22

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 23

When you are driving at night, you should:

A	drink coffee or other caffeine products to help keep you awake.
B	roll down your window so that the fresh air will 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 24

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 25

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 26

If you become sleepy while driving, you should:

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

Question 27

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

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

Question 28

Wheel bearing seals should be checked for ______.

A	leaks
B	rust
C	burning
D	rubbing

Question 29

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

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

Question 30

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 31

Which of the following is considered a hazard?

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

Question 32

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 33

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 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	Too many vertical stacks.
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	Oil on the tie rod.

Question 35

Empty trucks ______.

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

Question 36

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 37

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

Question 38

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

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

Question 39

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

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

Question 40

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

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

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	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 42

Containerized loads are:

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

Question 43

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

Question 44

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

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

Question 45

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 46

The braking power of the spring brakes:

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

Question 47

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

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

Question 48

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

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

Question 49

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

Question 50

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

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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