Iowa General Knowledge Practice Test

This is our Iowa 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

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 2

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

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

Question 3

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 fully loaded or very heavy.
C	the trailer is being hauled at high speed.
D	the trailer is empty or lightly loaded.

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

Question 5

Empty trucks ______.

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

Question 6

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

Question 7

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	downshift into the turn.
C	keep the cargo as close to the ground as possible.
D	check to make sure that the brakes are properly balanced.

Question 8

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

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

Question 9

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 10

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 at night.
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 11

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 12

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

Question 13

Containerized loads are:

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

Question 14

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	3/32-inch in every major groove.
D	2/32-inch in every major groove.

Question 15

______ can cause a fire.

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

Question 16

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

Question 17

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

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

Question 18

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 19

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

Question 20

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

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

Question 21

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 22

Wheel bearing seals should be checked for ______.

A	rust
B	rubbing
C	burning
D	leaks

Question 23

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	testing the trailer brakes after hooking up to a trailer.
C	it is absolutely necessary.
D	you will be parked for a short time.

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

Question 25

If you become sleepy while driving, you should:

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

Question 26

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 27

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 28

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 29

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

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

Question 30

With regard to safe driving, what does communicating mean?

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

Question 31

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 32

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

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

Question 33

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

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

Question 34

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

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

Question 35

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 36

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 37

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 38

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

Question 40

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 41

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 42

Any flatbed load must have at least ______ tie downs.

A	three
B	four
C	two
D	one

Question 43

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

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

Question 44

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 45

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

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

Question 46

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 47

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

A	half
B	three times
C	four times
D	two times

Question 48

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 it's good to know that information.
D	Because tank baffles are not always legal with outage.

Question 49

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

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

Question 50

The most important reason for conducting a pre-trip inspection of your vehicle is:

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

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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

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 2

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 3

______ can cause a fire.

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

Question 4

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

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

Question 5

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

Question 6

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	seven or more.
D	none of these.

Question 7

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

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

Question 8

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

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

Question 9

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

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

Question 10

The braking power of the spring brakes:

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

Question 11

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	Grease fire.
D	Gasoline fire.

Question 12

The reason placards are used is:

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

Question 13

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 14

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

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

Question 15

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 16

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

Question 17

You know your brakes are fading when:

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

Question 18

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 19

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

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

Question 20

Any flatbed load must have at least ______ tie downs.

A	four
B	three
C	two
D	one

Question 21

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

Question 22

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

Question 23

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 24

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	you will be parked for a short time.
C	it is absolutely necessary.
D	testing the trailer brakes after hooking up to a trailer.

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 is considered a hazard?

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

Question 27

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 28

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

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

Question 29

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

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

Question 30

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

Question 31

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

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

Question 32

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 33

Wheel bearing seals should be checked for ______.

A	burning
B	rust
C	rubbing
D	leaks

Question 34

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

Question 35

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 36

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 37

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

A	three times
B	four times
C	half
D	two times

Question 38

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 39

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 40

Rust around a lug nut is a sign that:

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

Question 41

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 42

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	it is a federal law.
D	you want to have time to act before it turns into an emergency.

Question 43

Empty trucks ______.

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

Question 44

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

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

Question 45

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 46

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

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

Question 47

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

Question 48

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 49

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

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

Question 50

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.

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
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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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