Colorado General Knowledge Practice Test

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This is our Colorado 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

If you become sleepy while driving, you should:

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

Question 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

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

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

Question 4

Empty trucks ______.

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

Question 5

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

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

Question 6

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 7

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

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

Question 8

Any flatbed load must have at least ______ tie downs.

A	two
B	three
C	one
D	four

Question 9

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

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

Question 10

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

A	three times
B	two times
C	four times
D	half

Question 11

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

Question 12

The braking power of the spring brakes:

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

Question 13

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 14

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

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

Question 15

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

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

Question 16

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 empty or lightly loaded.
D	the trailer is being hauled at high speed.

Question 17

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

Question 18

______ can cause a fire.

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

Question 19

Containerized loads are:

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

Question 20

With regard to safe driving, what does communicating mean?

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

Question 21

The reason placards are used is:

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

Question 22

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	turn right and drive over the curb
D	start the turn, then back up to re-position

Question 23

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 24

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

Question 25

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

Question 26

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 27

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	five or more.
D	seven or more.

Question 28

A pre-trip inspection should be completed:

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

Question 29

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 30

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

A	Downshift after you are in the curve.
B	Turn on your four-way flashers as you approach the offramp.
C	Slow to a safe speed before the curve.
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 31

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 32

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

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

Question 33

Wheel bearing seals should be checked for ______.

A	rubbing
B	burning
C	leaks
D	rust

Question 34

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 35

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 five degrees.
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 36

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

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

Question 37

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

Question 38

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 39

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	Keep your low beam lights on.
C	Warn other drivers by using your left turn signal lights.
D	Turn on your 4-way emergency flashers to warn other drivers.

Question 40

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 four.
D	A minimum of two.

Question 41

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

Question 42

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 43

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

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

Question 44

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 45

Rust around a lug nut is a sign that:

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

Question 46

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 47

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

Question 48

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

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

Question 49

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

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

Question 50

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	Push the brake pedal firmly 5 seconds; listen for leaks.
D	Move forward slowly and push firmly on the brake pedal.

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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

Please wait while the activity loads.
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

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

Question 2

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

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

Question 3

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

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

Question 4

Which of the following is considered a hazard?

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

Question 5

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 6

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	it will be raised slightly when the tractor is backed under it.
D	the end of the kingpin is at waist level.

Question 7

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 8

A pre-trip inspection should be completed:

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

Question 9

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

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

Question 10

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

Question 11

If you become sleepy while driving, you should:

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

Question 12

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 13

Any flatbed load must have at least ______ tie downs.

A	four
B	two
C	one
D	three

Question 14

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 15

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 16

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 17

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	increases when the service brakes are hot.
D	is not affected by the condition of the service brakes.

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	Downshift after you are in the curve.
B	Turn on your four-way flashers as you approach the offramp.
C	Slow to a safe speed before the curve.
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 19

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 20

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 21

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

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

Question 22

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

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

Question 23

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

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

Question 24

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

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

Question 25

Wheel bearing seals should be checked for ______.

A	rubbing
B	burning
C	leaks
D	rust

Question 26

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 27

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

Question 28

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

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

Question 29

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 four.
D	A minimum of one.

Question 30

Empty trucks ______.

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

Question 31

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	keep two hands firmly planted on the steering wheel at all times.
C	check to make sure that the brakes are properly balanced.
D	downshift into the turn.

Question 32

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

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

Question 33

The two driving conditions in which you should downshift are:

A	before starting down a hill and before going up a hill.
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 entering a tunnel.

Question 34

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

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

Question 35

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

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

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 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 cargo weight evenly over all the axles.

Question 37

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

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

Question 38

With regard to safe driving, what does communicating mean?

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

Question 39

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

A	three times
B	half
C	two times
D	four times

Question 40

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

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

Question 41

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

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

Question 42

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 43

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 44

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

Question 45

______ can cause a fire.

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

Question 46

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

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

Question 47

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 48

Containerized loads are:

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

Question 49

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 50

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

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.

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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

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