Texas General Knowledge Practice Test

This is our Texas 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 is considered a hazard?

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

Question 2

The reason placards are used is:

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

Question 3

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 4

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

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

Question 5

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

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

Question 6

With regard to safe driving, what does communicating mean?

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

Question 7

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

Question 8

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 three.
D	A minimum of four.

Question 9

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 10

______ can cause a fire.

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

Question 11

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 12

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 13

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

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

Question 14

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	keep your high beams on at all times.
D	drink coffee or other caffeine products to help keep you awake.

Question 15

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

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

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

Question 17

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

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

Question 18

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

Question 19

Containerized loads are:

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

Question 20

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 21

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 22

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

Question 23

Serious vehicle skids are usually caused by:

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

Question 24

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 25

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

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

Question 26

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 27

Any flatbed load must have at least ______ tie downs.

A	four
B	three
C	one
D	two

Question 28

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

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

Question 29

If you become sleepy while driving, you should:

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

Question 30

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	there is ice and snow, to prevent skidding.
D	it is absolutely necessary.

Question 31

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 32

Rust around a lug nut is a sign that:

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

Question 33

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

Question 34

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

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

Question 35

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

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

Question 36

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 37

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

A	half
B	three times
C	two times
D	four times

Question 38

Wheel bearing seals should be checked for ______.

A	rubbing
B	leaks
C	rust
D	burning

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	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 40

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 41

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	use windshield washer fluid as coolant.
D	safely remove the radiator cap and add coolant while the engine is hot.

Question 42

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

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

Question 43

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 44

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

Question 45

You know your brakes are fading when:

A	you release pressure on the brake pedal and speed increases.
B	there is a slight vibration when you press down on the brake pedal.
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 46

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 47

The braking power of the spring brakes:

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

Question 48

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

Question 49

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 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	Oil on the tie rod.
B	Too many vertical stacks.
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).

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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

You know your brakes are fading when:

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

Question 2

Wheel bearing seals should be checked for ______.

A	rubbing
B	burning
C	rust
D	leaks

Question 3

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	it will be raised slightly when the tractor is backed under it.
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 4

You are operating a new truck with a manual transmission and are about to drive down a long, steep downhill grade? What should you do?

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

Question 5

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 6

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 7

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

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

Question 8

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

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

Question 9

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 10

Any flatbed load must have at least ______ tie downs.

A	one
B	four
C	two
D	three

Question 11

With regard to safe driving, what does communicating mean?

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

Question 12

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 13

Containerized loads are:

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

Question 14

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.

Question 15

______ can cause a fire.

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

Question 16

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

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

Question 17

The two driving conditions in which you should downshift are:

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

Question 18

The reason placards are used is:

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

Question 19

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 20

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 21

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

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

Question 22

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

A	half
B	three times
C	two times
D	four times

Question 23

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 24

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

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

Question 25

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

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

Question 26

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	the road is wet, icy, or snow covered.
D	road conditions are excellent.

Question 27

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

A	To watch for steering errors.
B	To direct traffic away from you.
C	To see the blind spots you can't see.
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	The same amount of stopping distance.
B	It depends on what mood you are in at the time.
C	Greater stopping distance.
D	Shorter stopping distance.

Question 29

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 30

Rust around a lug nut is a sign that:

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

Question 31

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 32

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

Question 33

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

A	it is a federal law.
B	you want to avoid doing something all of a sudden.
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 34

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 35

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

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

Question 36

The braking power of the spring brakes:

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

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

Question 38

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 39

If you become sleepy while driving, you should:

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

Question 40

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 41

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

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

Question 42

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

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

Question 43

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

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

Question 44

Empty trucks ______.

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

Question 45

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 46

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

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

Question 47

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

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

Question 48

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

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

Question 49

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	dual tires that touch, hot road surfaces
D	poor-quality retreads, under-inflated tires

Question 50

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	keep your high beams on at all times.
D	drink coffee or other caffeine products to help keep you awake.

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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16	17	18	19	20
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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