North Carolina General Knowledge Practice Test

This is our North 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

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Congratulations! You have completed the General Knowledge CDL Practice Quiz. You scored %%SCORE%% out of %%TOTAL%%. Your performance has been rated as %%RATING%%

Your answers are highlighted below.

Question 1

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 2

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 even with the top of the fifth wheel.
C	the kingpin is about 1¼ inches above the fifth wheel.
D	the end of the kingpin is at waist level.

Question 3

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

Question 4

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

A	Load cargo weight evenly over all the axles.
B	Load more weight over the drive axle for better traction.
C	Load 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 5

When you are driving at night, you should:

A	roll down your window so that the fresh air will help keep you awake.
B	keep your high beams on at all times.
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 backing your vehicle, why should you use a helper?

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

Question 7

______ can cause a fire.

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

Question 8

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

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

Question 9

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 10

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 11

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

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

Question 12

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

Question 13

If you become sleepy while driving, you should:

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

Question 14

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 15

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	you release pressure on the brake pedal and speed increases.
C	the brake pedal feels firm when you apply pressure.
D	there is a slight vibration when you press down on the brake pedal.

Question 16

Any flatbed load must have at least ______ tie downs.

A	three
B	one
C	two
D	four

Question 17

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 have a plan to communicate the risk.
D	you want to avoid doing something all of a sudden.

Question 18

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 a higher gear than you would use to climb the hill.
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	Shift the truck into neutral and coast down the hill to save gas.

Question 19

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

Question 20

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

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

Question 21

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

A	three times
B	two times
C	half
D	four times

Question 22

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 23

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	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	Push the brake pedal firmly 5 seconds; listen for leaks.

Question 24

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

Question 25

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

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

Question 26

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

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

Question 27

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

A	Because some of the heaviest liquids don’t need any.
B	Because 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 28

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 29

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

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

Question 30

Serious vehicle skids are usually caused by:

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

Question 31

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

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

Question 32

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	Keep your low beam lights on.
C	Warn other drivers by using your left turn signal lights.
D	Put your warning devices out within 15 minutes.

Question 33

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

Question 34

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 35

Wheel bearing seals should be checked for ______.

A	rubbing
B	burning
C	rust
D	leaks

Question 36

Rust around a lug nut is a sign that:

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

Question 37

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 38

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 three.
D	A minimum of two.

Question 39

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

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

Question 40

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

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

Question 41

With regard to safe driving, what does communicating mean?

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

Question 42

Containerized loads are:

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

Question 43

The braking power of the spring brakes:

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

Question 44

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 45

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

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

Question 46

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 47

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 48

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

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

Question 49

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

Question 50

Empty trucks ______.

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

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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

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Congratulations! You have completed the General Knowledge CDL Practice Test. You scored %%SCORE%% out of %%TOTAL%%. Your performance has been rated as %%RATING%%

Your answers are highlighted below.

Question 1

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

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

Question 2

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 3

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

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

Question 4

Any flatbed load must have at least ______ tie downs.

A	four
B	one
C	three
D	two

Question 5

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	Push the brake pedal firmly 5 seconds; listen for leaks.
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 6

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

Question 7

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 8

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

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

Question 9

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 10

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

Question 11

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

Question 12

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

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

Question 13

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	three or more.
C	none of these.
D	five or more.

Question 14

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

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

Question 15

Wheel bearing seals should be checked for ______.

A	rust
B	rubbing
C	burning
D	leaks

Question 16

A pre-trip inspection should be completed:

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

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

Question 18

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 19

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

Question 20

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

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

Question 21

______ can cause a fire.

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

Question 22

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

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

Question 23

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

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

Question 24

The braking power of the spring brakes:

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

Question 25

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

A	four times
B	half
C	three times
D	two times

Question 26

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

Question 27

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

Question 28

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

Question 29

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

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

Question 30

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 31

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 it is a requirement for all drivers.
D	because law enforcement may inspect your vehicle on the road.

Question 32

With regard to safe driving, what does communicating mean?

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

Question 33

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 34

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 35

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

Question 36

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 37

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

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

Question 38

Empty trucks ______.

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

Question 39

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

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

Question 40

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 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 41

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

Question 42

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	you are driving on the freeway.
D	road conditions are excellent.

Question 43

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

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

Question 44

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	under-inflated tires, dual tires that touch
D	over-heated brakes, under-inflated tires

Question 45

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

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

Question 46

Containerized loads are:

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

Question 47

When you are driving at night, you should:

A	roll down your window so that the fresh air will help keep you awake.
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	keep your high beams on at all times.

Question 48

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 four.
D	A minimum of three.

Question 49

Rust around a lug nut is a sign that:

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

Question 50

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

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

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.

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→

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36	37	38	39	40
41	42	43	44	45
46	47	48	49	50
End

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
46	47	48	49	50
End

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
46	47	48	49	50
End

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
46	47	48	49	50
End

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
46	47	48	49	50
End