Missouri General Knowledge Practice Test

This is our Missouri 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 a coolant container is part of a pressurized system, you can:

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

Question 2

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

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

Question 3

A pre-trip inspection should be completed:

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

Question 4

The braking power of the spring brakes:

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

Question 5

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

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

Question 6

Wheel bearing seals should be checked for ______.

A	leaks
B	burning
C	rubbing
D	rust

Question 7

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

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

Question 8

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

Question 9

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

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

Question 10

Empty trucks ______.

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

Question 11

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

Question 12

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

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

Question 13

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 the freeway.
C	road conditions are excellent.
D	you are driving on hilly, rural roads.

Question 14

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 15

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

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

Question 16

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	Muscle control and coordination are affected.
D	All of these things happen.

Question 17

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

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

Question 18

The reason placards are used is:

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

Question 19

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

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

Question 20

Any flatbed load must have at least ______ tie downs.

A	four
B	two
C	one
D	three

Question 21

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 22

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 23

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

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

Question 24

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 25

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

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

Question 26

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	Turn on your 4-way emergency flashers to warn other drivers.
D	Keep your low beam lights on.

Question 27

______ can cause a fire.

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

Question 28

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

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

Question 29

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	Nothing, because the posted speed limit for the offramp is usually 10 miles per hour below the safe speed limit for the offramp.
C	Slow to a safe speed before the curve.
D	Downshift after you are in the curve.

Question 30

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 31

Which of the following is considered a hazard?

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

Question 32

If you become sleepy while driving, you should:

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

Question 33

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 34

Serious vehicle skids are usually caused by:

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

Question 35

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

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

Question 36

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

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

Question 37

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

Question 38

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

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

Question 39

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 40

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 hand signals.
D	Using turn signals, 4-way flashers, headlights, and the horn.

Question 41

Containerized loads are:

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

Question 42

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

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

Question 43

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 44

When you are driving at night, you should:

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

Question 45

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

Question 46

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	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	Play in the steering wheel of more than five degrees.

Question 47

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

Question 48

The two driving conditions in which you should downshift are:

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

Question 49

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 50

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

A	half
B	four times
C	two times
D	three times

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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

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 2

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

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

Question 3

With regard to safe driving, what does communicating mean?

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

Question 4

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

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

Question 5

Empty trucks ______.

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

Question 6

The braking power of the spring brakes:

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

Question 7

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

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

Question 8

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

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

Question 9

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

Question 10

A pre-trip inspection should be completed:

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

Question 11

The reason placards are used is:

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

Question 12

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

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

Question 13

______ can cause a fire.

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

Question 14

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

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

Question 15

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 3 times; push the pedal firmly 5 seconds; the pedal should not move.
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 16

Any flatbed load must have at least ______ tie downs.

A	four
B	two
C	three
D	one

Question 17

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

Question 18

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

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

Question 19

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 20

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

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

Question 21

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 22

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 23

Wheel bearing seals should be checked for ______.

A	rust
B	burning
C	leaks
D	rubbing

Question 24

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	Oil on the tie rod.
C	Play in the steering wheel of more than five degrees.
D	Too many vertical stacks.

Question 25

If you become sleepy while driving, you should:

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

Question 26

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

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

Question 27

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

A	half
B	four times
C	two times
D	three times

Question 28

Due to its size, if your vehicle cannot make a right turn without swinging into another lane, you should ______ to prevent others from passing you on the right.

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

Question 29

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 30

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

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

Question 31

You are operating a new truck with a manual transmission and are about to drive down a long, steep downhill grade? What should you do?

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

Question 32

The two driving conditions in which you should downshift are:

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

Question 33

Rust around a lug nut is a sign that:

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

Question 34

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 weight limit restrictions.
D	exempt from height restrictions.

Question 35

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

Question 36

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 37

Serious vehicle skids are usually caused by:

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

Question 38

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 39

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

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

Question 40

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

Question 41

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 42

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

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

Question 43

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

Question 44

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

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

Question 45

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 46

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.

Question 47

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

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

Question 48

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

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

Question 49

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

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

Question 50

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

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

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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