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

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	Grease fire.
D	Electrical fire.

Question 2

Any flatbed load must have at least ______ tie downs.

A	two
B	one
C	three
D	four

Question 3

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	The drinker's brain is increasingly affected.
D	Muscle control and coordination are affected.

Question 4

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 out of brake adjustment.
C	the trailer is being hauled at high speed.
D	the trailer is empty or lightly loaded.

Question 5

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

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

Question 6

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

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

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 as you complete the turn
D	turn wide before you start the turn

Question 8

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

A	half
B	three times
C	two times
D	four times

Question 9

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

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

Question 10

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	It depends on what mood you are in at the time.
D	The same amount of stopping distance.

Question 11

With regard to safe driving, what does communicating mean?

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

Question 12

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

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

Question 13

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	you have to push harder and harder to get the same stopping power on a downgrade.
D	there is a slight vibration when you press down on the brake pedal.

Question 14

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	because it is a requirement for all drivers.
D	to ensure safety for yourself, your passengers, and other drivers.

Question 15

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

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

Question 16

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

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

Question 17

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

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

Question 18

A pre-trip inspection should be completed:

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

Question 19

______ can cause a fire.

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

Question 20

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 21

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 22

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

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

Question 23

If you become sleepy while driving, you should:

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

Question 24

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 25

Serious vehicle skids are usually caused by:

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

Question 26

The braking power of the spring brakes:

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

Question 27

Rust around a lug nut is a sign that:

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

Question 28

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 29

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 30

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

Question 31

The reason placards are used is:

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

Question 32

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

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

Question 33

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 34

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	make sure you are driving slow enough so you can stop within the range of your headlights in case of an emergency.
D	drink coffee or other caffeine products to help keep you awake.

Question 35

Wheel bearing seals should be checked for ______.

A	rubbing
B	leaks
C	rust
D	burning

Question 36

Empty trucks ______.

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

Question 37

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

Question 38

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 it's good to know that information.
D	Because some of the heaviest liquids don’t need any.

Question 39

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 40

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

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

Question 41

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

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

Question 42

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 on a dry road.
D	The same amount of space you would at night.

Question 43

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 44

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

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

Question 45

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

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

Question 46

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

A	Load cargo weight evenly over all the axles.
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 toward the rear of the truck for easier unloading.

Question 47

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 48

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 49

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

Question 50

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.

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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

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 2

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

Question 3

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

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

Question 4

______ can cause a fire.

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

Question 5

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

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

Question 6

The reason placards are used is:

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

Question 7

Empty trucks ______.

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

Question 8

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 9

If you become sleepy while driving, you should:

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

Question 10

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

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

Question 11

Any flatbed load must have at least ______ tie downs.

A	four
B	three
C	two
D	one

Question 12

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 13

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 14

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

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

Question 15

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 16

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 17

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 18

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

Question 19

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 three.
D	A minimum of four.

Question 20

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	roll down your window so that the fresh air will 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 21

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

A	three times
B	half
C	two times
D	four times

Question 22

Wheel bearing seals should be checked for ______.

A	rubbing
B	burning
C	leaks
D	rust

Question 23

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

Question 24

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

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

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

Question 26

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

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

Question 27

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 28

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 being hauled at high speed.
C	the trailer is out of brake adjustment.
D	the trailer is empty or lightly loaded.

Question 29

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

Question 30

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

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

Question 31

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 32

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

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

Question 33

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

A	it is a federal law.
B	you want to have a plan to communicate the risk.
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 34

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

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

Question 35

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

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

Question 36

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

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

Question 37

Containerized loads are:

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

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

Question 39

Rust around a lug nut is a sign that:

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

Question 40

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

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

Question 41

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 can catch fire easily.
D	the load should not get wet.

Question 42

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 43

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

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

Question 44

Which of the following is considered a hazard?

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

Question 45

With regard to safe driving, what does communicating mean?

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

Question 46

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 47

Serious vehicle skids are usually caused by:

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

Question 48

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 49

You know your brakes are fading when:

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

Question 50

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.

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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