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

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

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

Question 2

Containerized loads are:

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

Question 3

Which of the following is considered a hazard?

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

Question 4

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 5

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	you want to have a plan to communicate the risk.
D	it is a federal law.

Question 6

A pre-trip inspection should be completed:

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

Question 7

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 cheap.
D	the lug nut is loose.

Question 8

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

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

Question 9

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 10

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

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

Question 11

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

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

Question 12

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

Question 13

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 14

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 15

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 16

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 17

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

Question 18

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

Question 19

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

Question 20

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

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

Question 21

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

Question 22

The two driving conditions in which you should downshift are:

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

Question 23

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 24

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 25

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

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

Question 26

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

Question 27

Empty trucks ______.

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

Question 28

If you become sleepy while driving, you should:

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

Question 29

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

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

Question 30

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

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

Question 31

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 32

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

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

Question 33

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 34

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

Question 35

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

Question 36

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

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

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	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 38

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	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 39

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

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

Question 40

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

A	half
B	four times
C	two times
D	three times

Question 41

______ can cause a fire.

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

Question 42

Any flatbed load must have at least ______ tie downs.

A	four
B	two
C	one
D	three

Question 43

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 44

Wheel bearing seals should be checked for ______.

A	burning
B	leaks
C	rust
D	rubbing

Question 45

Serious vehicle skids are usually caused by:

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

Question 46

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 47

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

Question 48

With regard to safe driving, what does communicating mean?

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

Question 49

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 50

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

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

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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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If this activity does not load, try refreshing your browser. Also, this page requires javascript. Please visit using a browser with javascript enabled.

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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

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

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

Question 2

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 before you start the turn
D	turn wide as you complete the turn

Question 3

______ can cause a fire.

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

Question 4

The braking power of the spring brakes:

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

Question 5

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

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

Question 6

Which of the following is considered a hazard?

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

Question 7

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 8

If you become sleepy while driving, you should:

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

Question 9

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

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

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 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 11

Empty trucks ______.

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

Question 12

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 13

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 some of the heaviest liquids don’t need any.
C	Because it's good to know that information.
D	Because tank baffles are not always legal with outage.

Question 14

Any flatbed load must have at least ______ tie downs.

A	four
B	three
C	one
D	two

Question 15

When you are driving at night, you should:

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

Question 16

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

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

Question 17

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

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

Question 18

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

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

Question 19

A pre-trip inspection should be completed:

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

Question 20

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

Question 21

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 22

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 23

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

Question 24

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	Put your warning devices out within 15 minutes.
D	Warn other drivers by using your left turn signal lights.

Question 25

Serious vehicle skids are usually caused by:

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

Question 26

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

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

Question 27

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

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

Question 28

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 29

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

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

Question 30

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

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

Question 31

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

Question 32

Wheel bearing seals should be checked for ______.

A	leaks
B	rust
C	rubbing
D	burning

Question 33

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 34

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

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

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

Question 36

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	The same amount of space you would on a dry road.
D	One vehicle length for every 10,000 lb. of gross vehicle weight.

Question 37

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 38

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

A	half
B	three times
C	four times
D	two times

Question 39

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 40

The reason placards are used is:

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

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

Question 42

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 height restrictions.
D	exempt from weight limit restrictions.

Question 43

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

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

Question 44

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 45

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

Question 46

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	testing the trailer brakes after hooking up to a trailer.
D	it is absolutely necessary.

Question 47

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 more weight over the drive axle for better traction.
D	Load cargo weight evenly over all the axles.

Question 48

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	Judgment and self-control are the first to be affected.
D	The drinker's brain is increasingly affected.

Question 49

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

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

Question 50

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

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

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
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16	17	18	19	20
21	22	23	24	25
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31	32	33	34	35
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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