Padi Open Water Diver

Front 1

Positive buoyancy

Back 1

An object weighs less than the water it displaces

Front 2

Which two of equipment do you use to control your buoyancy ?

Back 2

BCD and weights.

Front 3

Why control your buoyancy one of the key skills?

Back 3

Because you have this influence on where you are in the water.

Front 4

What is the difference in buoyancy between fresh and salt water?

Back 4

An object has more buoyant in salt water than in fresh water. (salt water weighs more by dissolved salt)

Front 5

How does your breathing affect your buoyancy ?

Back 5

When you exhale, lung volume decreases. This gives you less buoyant.

Front 6

Why do you feel changing pressure usually only in the air spaces of your body?

Back 6

Because your body is composed mainly of non- compressible fluids, but air or compressible and volume changes when the pressure changes.

Front 7

Why are changes in water pressure greater than in air?

Back 7

Because water weighs more ( is denser and heavier).

Front 8

What is the absolute pressure , volume and density at 10m/33ft, 20m/66m, 30m/99ft and 40m/132ft meters ?

Back 8

2 bar/ata, 1/2, x2
3 bar/ata, 1/3, x3
4 bar/ata, 1/4, x4
5 bar/ata, 1/5, x5

Front 9

What are the three main air spaces that are affected by the pressure during descent ?

Back 9

Mask , ears and sinuses .

Front 10

What is a squeeze ?

Back 10

A differential pressure at which the pressure in an air space is less than the ambient pressure , with pain or discomfort as a result.

Front 11

What is clear ?

Back 11

During the descent, to add air to the air -containing cavities in order to ensure that the pressure in the cavity is equal to the ambient pressure.

Front 12

What techniques are there to get your ears?

Back 12

You noses and gently try to exhale, swallowing and your jaw move back and forth , these two things at once.

Front 13

When should you equalize your ears?

Back 13

Each meter before it is unpleasant.

Front 14

What should you do if you feel uncomfortable and can not get equalized ?

Back 14

Ascend to a higher altitude and try again to finish equalizing . Then descend slowly. End the dive if you can not get equalize .

Front 15

What is the most important rule when diving?

Back 15

By continuing to breathe and never hold your breath .

Front 16

What can happen if you hold your breath when ascending?

Back 16

This can cause lung over expansion injuries , allowing air into your bloodstream may get into the chest (cause serious injuries including paralysis and death = injuries that easily avoided by not hold your breath )

Front 17

What is a reverse block ?

Back 17

Pain or discomfort because of trapped air that expands during ascent .

Front 18

What should you do when a reverse block ?

Back 18

Delay or interrupt your ascent and give the trapped air a chance to escape.

Front 19

What impact has greater depth on how long you do with your air?

Back 19

As you delve deeper , the air in your tank run out quickly .

Front 20

What is the most efficient way to breathe underwater ?

Back 20

Deeply and slowly .

Front 21

Why do you need a mask underwater to see?

Back 21

Because the human eye can not focus under water.

Front 22

Why does your nose need to be inside the mask?

Back 22

To equalize or clear your mask.

Front 23

What are the characteristics you seek out a mask?

Back 23

Small volume, cutout for nose or forthe fingers, large field of view .

Front 24

What is the most important consideration when buying diving equipment including a mask?

Back 24

Fit and comfort.

Front 25

What should you do if you get a new mask for the first time?

Back 25

Removing the factory applied coating , adjusting the mask strap .

Front 26

How to maintain your mask?

Back 26

After use , rinse with tap water , stored in cool, dry space.

Front 27

Why do you need a snorkel when diving?

Back 27

To conserve compressed air as you swim to the surface to breathe easier with waves on the surface, if you with an empty bottle travels a greater distance

Front 28

What characteristics does a snorkel with low breathing resistancehave ?

Back 28

A larger diameter and uniform , gentle curve .

Front 29

When a snorkel properly adjusted ?

Back 29

If he stays in a relaxed jaw in your mouth and is located on the left side of your mask.

Front 30

Why can move effectively with fins ?

Back 30

They have a large surface area, so you can use your leg muscles to move through the water. This is much more effective than your arms.

Front 31

What type of fin you usually use with neoprene booties ?

Back 31

Adjustable fins .

Front 32

What characteristics of a fin are designed to improve the performance?

Back 32

Holes , grooves and ribs ( no wings ) .

Front 33

What should you do if you use your fins for the first time ?

Back 33

Nothing special, except the strap adjustment at an open heel fin .

Front 34

What considerations when buying fins ?

Back 34

Your body size , your muscle strength and the environment you want to go swimming .

Front 35

Why do you need a BCD ?

Back 35

You regulate buoyancy water and above water to have positive buoyancy .

Front 36

What are the five essential characteristics of a BCD ?

Back 36

Large diameter hose for venting and filling, lagedrukinflator , pressure relief valve , large enough for sufficient buoyancy , comfortable harness and backpack. H

Front 37

How to maintain your BCD ?

Back 37

Rinse (inside and outside) , dry and store in the sun with some air in it (so that the bladder is not sticking to the inside).

Front 38

Of which two types of metal tanks are usually made ​​of?

Back 38

Aluminum & steel

Front 39

What marks are there in a bottle?

Back 39

Date of hydrostatic test pressure , serial number.

Front 40

What is the difference between a collar and a J K faucet?

Back 40

J crane has a spare and a K crane not .

Front 41

What is the difference between a DIN valve and an yoke?

Back 41

With a DIN valve is the regulator screwed into the valve and an international crane goes over a bracket . With a DIN valve is the o-ring on the machine and in the yoke on the crane.

Front 42

Which has a knock ?

Back 42

This allows air to escape when the filling pressure is too high or the bottle to overheat.

Front 43

What should you do if you transported tanks ?

Back 43

She lay down and fix ( sometimes they remain ) so they can not roll , they never leave unattended .

Front 44

How do you avoid getting water in your tank ?

Back 44

Never by the bottle completely deflate to empty.

Front 45

Why is a yearly visual inspection of your tank need?

Back 45

To check for corrosion within the cylinder .

Front 46

How many steps does the machine lowers the pressure of the air in the bottle?

Back 46

Two

Front 47

What is the second step ?

Back 47

Mouthpiece and therearound.

Front 48

Where you need to when rinsing your machine think ?

Back 48

That you reinstall the dust cover of the 1st stage , not the purge button, use a soft beam .

Front 49

What's a gauge?

Back 49

Required component that tells you how much air you have left .

Front 50

What are the reasons to dive with a buddy ?

Back 50

Practical considerations , safety , fun.

Front 51

How does the water affect he way you see/perceive things?

Back 51

You see everything larger and / or closer.

Front 52

How influenced water the intensity of color and light?

Back 52

Water absorbs light, making it darker as you go deeper and colors are less intense.

Front 53

How does sound under water?

Back 53

Sound travels 4x faster under water , making it difficult to determine where it comes from . Sounds usually seem to come from above.

Front 54

How fast water absorbs heat ?

Back 54

20 times faster than air.

Front 55

What should you do if you begin shivering continuously ?

Back 55

Immediately terminate your dive, afdroken yourself and enjoy the warmth .

Front 56

What is the most efficient way to move underwater ?

Back 56

Slow, steady and relaxed.

Front 57

How to breathe underwater for max efficiency ?

Back 57

Slowly and deeply.

Front 58

What are eight symptoms of overexertion ?

Back 58

Fatigue, breathing heavily , the feeling that you choke , weakness , shortness of breath , headache, cramps, tend to panic.

Front 59

How can you prevent overexertion ?

Back 59

Take it easy , knowing your own limits , avoid prolonged exertion.

Front 60

What should you do if you get overtired ?

Back 60

Stop any form of exercise tasks and rest.

Front 61

What are techniques to keep your breathing under control?

Back 61

Slowly breathe when water enters your machine or snorkel , gently inhale as you've just done , use your tongue as a splash guard .

Front 62

What information will be shown on your dive computer?

Back 62

Time, depth , direction, temperature and air supply .

Front 63

Why do you need a gauge ?

Back 63

Because the time limits depth bound .

Front 64

Why do you need an underwater compass ?

Back 64

To determine where you can leave the water and follow a course.

Front 65

What are nine things you should discuss with your buddy when planning a dive ?

Back 65

Agree on where your water comes in and out , and what techniques you typically used for this purpose. Determine which direction you are going to follow , make agreements on time and depth limits , take the communication , meet at any cylinder pressure you return , discuss how to stay together, what you do when you lose each other , emergency procedures , what the purpose of the dive .

Front 66

What's the predive safety check?

Back 66

(BWRAF) Bruce Willis Ruins All Films

BCD - Weights - Releases - Air - Fins

Front 67

Which six environmental factors may affect you in any water environment?

Back 67

Temperature, visibility, water movement, soil , water and sunlight life .

Front 68

What's a thermocline?

Back 68

An abrupt transition to a low cooler water.

Front 69

What four factors influence the sight?

Back 69

Weather, water movement , particulate matter and soil conditions.

Front 70

Why is also in clear water recommended to use a rope to ascend and descend and a depth gauge?

Back 70

The soil may appear closer than it is and you can become disoriented .

Front 71

What causes currents?

Back 71

The wind that blows across the surface , uneven uneven heating and cooling of the water , tides and currents (waves ..? ) ...

Front 72

What are considerations for diving in fresh water?

Back 72

Deep water , height, termoclines and limited visibility.

Front 73

Opverwegingen for salt water.

Back 73

Surf , tide , sea life , waves.

Front 74

What causes waves and how do you avoid that ?

Back 74

As the wind blows over the surface and produces waves , you avoid by diving deeper.

Front 75

Indicate where waves break on the coast ?

Back 75

An offshore lying reef , wreck or sandbar ( shoal on which waves break )

Front 76

What's a rip current?

Back 76

A rip current occurs when waves push water over a long obstruction as a sandbar or reef. The water can on the underside does not matter, so the steam back into the sea through a narrow opening. You can recognize a rip current to disruption of the waves, strong currents and murky landafwaardse sudsy water .

Front 77

If you end up in a rip current, what should I do to get out of it?

Back 77

Swim parallel to the coast.

Front 78

What's an upwelling?

Back 78

A slow flow that occurs when the surface area of ​​about water through a land breeze is pushed away from the coast . There will then deep water upwards to compensate for the loss .

Front 79

At which the tide diving conditions are usually the best?

Back 79

Rampant? wth

Front 80

Which four steps are involved in a dive plan?

Back 80

Advance planning, preparation planing, last minute preparation and predive planning.

Front 81

5 steps which follow during the pre-planning ?

Back 81

buddy dive purpose , dive site, alternative place , time

Front 82

Preparation planning steps:

Back 82

Check your equipment and conditions

Front 83

What do you do at the last-minute preparation ?

Back 83

check weather , info show back home , things last address as cooler and jacket, bag and idiot stuff in check.

Front 84

How can you avoid most of the problems on the surface ?

Back 84

By diving within your limits , during a dive to relax and to provide positive buoyancy .

Front 85

How can you avoid most problems under water?

Back 85

By diving within your limits , your air supply to keep watch and relax.

Front 86

What problems can occur under water?

Back 86

overexertion , without air get trapped , lifts off, automatic, entanglement.

Front 87

What is the procedure if I find I have little or no air ?

Back 87

Normal ascent, ascend with alternate air source, controlled emergency swimming ascent (CESA) , buoyant emergency ascent.

Front 88

How far have you and your dive flag boats keep coming from?

Back 88

You should be within 50ft. Boats should stay at least 100-200ft away.

Front 89

What are the two gases, which consists mainly of air ?

Back 89

Oxygen, 21% nitrogen and 79%.

Front 90

What are five possible symptoms of polluted air ?

Back 90

headache , nausea, cherry red lips and toenails, dizziness , fainting.

Front 91

What should you do if a diver breathes polluted air has been ?

Back 91

The diver with fresh air , pure oxygen and if present consult doctor.

Front 92

How do you prevent problems with contaminated air ?

Back 92

How do you prevent problems with Only fill at reputable sources.

Front 93

How do you prevent problems with oxygen?

Back 93

Never let your bottle filled with pure oxygen , no nitrox use without training , diving within the limits of recreational diving.

Front 94

What are the symptoms of nitrogen narcosis ?

Back 94

Strange behavior , false sense of security unrest.

Front 95

Probably something about how do you treat nitrogen narcosis?

Back 95

Ascend to a shallow depth.

Front 96

How can you avoid nitrogen narcosis ?

Back 96

Never dive deeper than 60 ft

Front 97

What affects nitrogen in your body?

Back 97

Depth and time.

Front 98

What is decompression sickness?

Back 98

The state ontstaant when a diver the prescribed time and depth limits overschreid and bubbles form in the body.

Front 99

What are signs of decompression sickness?

Back 99

paralysis , shock, weakness, dizziness , numbness, tingling, trouble breathing , pain in limbs and joints.

Front 100

Negative buoyancy

Back 100

object weighs more than the water it displaces