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

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 2

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

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

Question 3

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

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

Question 4

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

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

Question 5

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

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

Question 6

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

Question 8

A pre-trip inspection should be completed:

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

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

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 11

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

A	four times
B	three times
C	two times
D	half

Question 12

The braking power of the spring brakes:

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

Question 13

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

Question 14

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 15

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

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

Question 16

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

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

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	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 18

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

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

Question 19

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

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

Question 20

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 at waist level.
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 21

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 22

Wheel bearing seals should be checked for ______.

A	rubbing
B	burning
C	leaks
D	rust

Question 23

Serious vehicle skids are usually caused by:

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

Question 24

Empty trucks ______.

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

Question 25

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.

Question 26

With regard to safe driving, what does communicating mean?

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

Question 27

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	Keep your low beam lights on.
C	Turn on your 4-way emergency flashers to warn other drivers.
D	Put your warning devices out within 15 minutes.

Question 28

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

Question 29

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

Question 30

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

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

Question 31

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

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

Question 32

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

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

Question 33

If you become sleepy while driving, you should:

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

Question 34

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

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

Question 35

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	use windshield washer fluid as coolant.
D	check the coolant level of a hot engine.

Question 36

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	because law enforcement may inspect your vehicle on the road.
C	because it is a requirement for all drivers.
D	to help ensure the vehicle will make it to your destination.

Question 37

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 38

______ can cause a fire.

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

Question 39

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	keep your high beams on at all times.
C	drink coffee or other caffeine products to help keep you awake.
D	roll down your window so that the fresh air will help keep you awake.

Question 40

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	Grease fire.
D	Electrical fire.

Question 41

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 42

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

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

Question 43

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

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

Question 44

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 45

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

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

Question 46

Any flatbed load must have at least ______ tie downs.

A	four
B	three
C	two
D	one

Question 47

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

Question 48

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 catch fire easily.
D	the load can shift.

Question 49

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 50

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.

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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

Containerized loads are:

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

Question 2

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 3

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

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

Question 4

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

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	dual tires that touch, hot road surfaces
D	under-inflated tires, dual tires that touch

Question 6

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	because it is a requirement for all 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 7

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

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

Question 8

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 9

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 10

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

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

Question 11

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

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

Question 12

You know your brakes are fading when:

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

Question 13

Rust around a lug nut is a sign that:

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

Question 14

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 the same gear you would use to climb the hill.
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.

Question 15

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

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

Question 16

If you become sleepy while driving, you should:

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

Question 17

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 18

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 19

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

Question 20

Any flatbed load must have at least ______ tie downs.

A	four
B	two
C	three
D	one

Question 21

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 22

A pre-trip inspection should be completed:

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

Question 23

The braking power of the spring brakes:

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

Question 24

The reason placards are used is:

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

Question 25

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

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

Question 26

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

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

Question 27

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 28

______ can cause a fire.

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

Question 29

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

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

Question 30

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	The drinker's brain is increasingly affected.
D	All of these things happen.

Question 31

When you are driving at night, you should:

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

Question 32

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

Question 33

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

Question 34

Wheel bearing seals should be checked for ______.

A	rust
B	rubbing
C	burning
D	leaks

Question 35

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

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

Question 36

Empty trucks ______.

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

Question 37

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

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

Question 38

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

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

Question 39

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 40

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 41

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 42

Which of the following is considered a hazard?

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

Question 43

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 44

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

A	three times
B	four times
C	half
D	two times

Question 45

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

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

Question 46

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 47

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	five or more.
C	seven or more.
D	three or more.

Question 48

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	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 on a dry road.

Question 49

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	safely remove the radiator cap and add coolant while the engine is hot.
D	use windshield washer fluid as coolant.

Question 50

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.

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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