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

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 watch for steering errors.
D	To see the blind spots you can't see.

Question 2

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

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

Question 3

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

A	two times
B	three times
C	four times
D	half

Question 4

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 5

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	drink coffee or other caffeine products to 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 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	five or more.
B	three or more.
C	none of these.
D	seven or more.

Question 7

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 8

With regard to safe driving, what does communicating mean?

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

Question 9

Wheel bearing seals should be checked for ______.

A	burning
B	rubbing
C	rust
D	leaks

Question 10

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 11

The braking power of the spring brakes:

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

Question 12

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

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

Question 13

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	Greater stopping distance.
C	Shorter stopping distance.
D	It depends on what mood you are in at the time.

Question 14

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

Question 15

Empty trucks ______.

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

Question 16

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 17

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 authentic.
D	seal is secure.

Question 18

Serious vehicle skids are usually caused by:

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

Question 19

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

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

Question 20

The reason placards are used is:

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

Question 21

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

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

Question 22

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 some liquids expand more than others when they get warm.
D	Because tank baffles are not always legal with outage.

Question 23

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	Shift the truck into neutral and coast down the hill to save gas.
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 24

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

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

Question 25

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

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

Question 26

A pre-trip inspection should be completed:

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

Question 27

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

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

Question 28

The two driving conditions in which you should downshift are:

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

Question 29

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 cargo toward the rear of the truck for easier unloading.
C	Load cargo weight evenly over all the axles.
D	Load more weight over the drive axle for better traction.

Question 30

______ can cause a fire.

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

Question 31

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	because law enforcement may inspect your vehicle on the road.
D	to help ensure the vehicle will make it to your destination.

Question 32

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 33

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

Question 34

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 35

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

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

Question 36

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 37

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 38

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	Too many vertical stacks.
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 39

Any flatbed load must have at least ______ tie downs.

A	three
B	two
C	one
D	four

Question 40

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

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

Question 41

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

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

Question 42

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 43

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

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

Question 44

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

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

Question 45

If you become sleepy while driving, you should:

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

Question 46

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 47

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 48

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 49

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 50

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

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

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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

______ can cause a fire.

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

Question 2

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 help ensure the vehicle will make it to your destination.
C	to ensure safety for yourself, your passengers, and other drivers.
D	because it is a requirement for all drivers.

Question 3

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 4

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

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

Question 5

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

Question 6

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

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

Question 7

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

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

Question 8

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

Question 9

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

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

Question 10

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 11

Empty trucks ______.

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

Question 12

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 13

The trailer hand valve (also called the trolley valve or Johnson bar) should only be used when:

A	testing the trailer brakes after hooking up to a trailer.
B	it is absolutely necessary.
C	you will be parked for a short time.
D	there is ice and snow, to prevent skidding.

Question 14

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

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

Question 15

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 16

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 17

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 18

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

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

Question 19

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 20

If you become sleepy while driving, you should:

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

Question 21

Any flatbed load must have at least ______ tie downs.

A	one
B	two
C	four
D	three

Question 22

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

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

Question 23

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 24

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 25

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 watch for steering errors.
D	To prevent others from distracting you.

Question 26

Containerized loads are:

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

Question 27

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

A	four times
B	half
C	three times
D	two times

Question 28

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 29

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 30

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 cargo toward the rear of the truck for easier unloading.
C	Load cargo weight evenly over all the axles.
D	Load more weight over the drive axle for better traction.

Question 31

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

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

Question 32

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

A	Turn on your four-way flashers as you approach the offramp.
B	Downshift after you are in the curve.
C	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 33

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

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

Question 34

Rust around a lug nut is a sign that:

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

Question 35

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	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 36

The two driving conditions in which you should downshift are:

A	before starting down a hill and before entering a curve.
B	before going up 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 37

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

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

Question 38

You know your brakes are fading when:

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

Question 39

Wheel bearing seals should be checked for ______.

A	rust
B	burning
C	leaks
D	rubbing

Question 40

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 41

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	you are driving on hilly, rural roads.
D	the road is wet, icy, or snow covered.

Question 42

The braking power of the spring brakes:

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

Question 43

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

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

Question 44

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

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

Question 45

A pre-trip inspection should be completed:

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

Question 46

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

Question 47

Serious vehicle skids are usually caused by:

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

Question 48

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

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

Question 49

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

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

Question 50

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 can shift.
D	the load should not get wet.

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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