Pennsylvania General Knowledge Practice Test

This is our Pennsylvania 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

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

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

Question 2

Containerized loads are:

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

Question 3

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 4

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 5

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

Question 6

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 7

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

A	three times
B	four times
C	half
D	two times

Question 8

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

A	Push the brake pedal firmly 5 seconds; listen for leaks.
B	Move forward slowly and push firmly on the brake pedal.
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 9

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 10

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

Question 11

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 12

______ can cause a fire.

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

Question 13

Serious vehicle skids are usually caused by:

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

Question 14

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	seven or more.
C	three or more.
D	five or more.

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	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 16

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

Question 17

If you become sleepy while driving, you should:

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

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	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 19

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

Question 20

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 more cargo toward the front of the truck for a full load.
D	Load cargo toward the rear of the truck for easier unloading.

Question 21

Any flatbed load must have at least ______ tie downs.

A	four
B	two
C	three
D	one

Question 22

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

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

Question 23

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

Question 24

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

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

Question 25

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 26

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	check the coolant level of a hot engine.
D	safely remove the radiator cap and add coolant while the engine is hot.

Question 27

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

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

Question 28

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

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

Question 29

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

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

Question 30

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

Question 31

A pre-trip inspection should be completed:

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

Question 32

With regard to safe driving, what does communicating mean?

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

Question 33

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

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

Question 34

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

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

Question 35

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

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

Question 36

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

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

Question 37

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 38

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

Question 39

The two driving conditions in which you should downshift are:

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

Question 40

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 41

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 42

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

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

Question 43

Wheel bearing seals should be checked for ______.

A	rust
B	leaks
C	burning
D	rubbing

Question 44

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	keep your high beams on at all times.
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 45

The reason placards are used is:

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

Question 46

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

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

Question 47

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

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

Question 48

Which of the following is considered a hazard?

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

Question 49

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

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

Question 50

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

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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

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

Question 2

Empty trucks ______.

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

Question 3

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 tank baffles are not always legal with outage.
D	Because some of the heaviest liquids don’t need any.

Question 4

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

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

Question 5

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

A	three times
B	half
C	four times
D	two times

Question 6

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 7

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 8

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

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

Question 9

When driving on a slippery road during the day, how much space should you keep ahead of your truck?

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

Question 10

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

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

Question 11

Wheel bearing seals should be checked for ______.

A	rubbing
B	burning
C	leaks
D	rust

Question 12

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	3/32-inch in every major groove.
D	5/32-inch in every major groove.

Question 13

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

Question 14

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

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

Question 15

Serious vehicle skids are usually caused by:

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

Question 16

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

Question 17

Any flatbed load must have at least ______ tie downs.

A	four
B	one
C	three
D	two

Question 18

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 19

Which of the following is considered a hazard?

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

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

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

Question 22

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 23

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

Question 24

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 25

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 26

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

Question 27

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	Slow to a safe speed before the curve.
C	Downshift after you are in 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 28

When you are driving at night, you should:

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

Question 29

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 30

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.

Question 31

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

Question 32

The braking power of the spring brakes:

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

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

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

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

Question 35

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

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

Question 36

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	you release pressure on the brake pedal and speed increases.
D	the brake pedal feels firm when you apply pressure.

Question 37

______ can cause a fire.

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

Question 38

With regard to safe driving, what does communicating mean?

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

Question 39

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

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

Question 40

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

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

Question 41

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	testing the trailer brakes after hooking up to a trailer.
D	there is ice and snow, to prevent skidding.

Question 42

If you become sleepy while driving, you should:

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

Question 43

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

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

Question 44

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 45

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

Question 46

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

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

Question 47

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 48

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

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

Question 49

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 50

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.

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