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School 2022-2023 > Scuba > Flashcards

Scuba Flashcards

1
Q

Underwater objects appear how much closer?

A

25%

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2
Q

Underwater objects appear how much larger?

A

1/3

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3
Q

As you descend what colors disappear first?

A

Reds and oranges

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4
Q

How much denser is water than air?

A

800x denser

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5
Q

How much faster does sound move in water?

A

4x faster

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6
Q

Water conducts heat away from your body ____ times faster than air does?

A

25x faster

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7
Q

When should you wear thermal protection?

A

Always

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8
Q

Water stratifies into layers by temp. what is the name of the boundary?

A

Thermocline

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9
Q

What is the primary cause of waves?

A

Wind

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10
Q

What forms surf?

A

The bottom of the wave slows causing the wave to break

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11
Q

What is the back and forth movement of water caused by waves passing overhead called?

A

Surge

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12
Q

Tides can affect what three things?

A

Depth, current, visibility

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13
Q

What 2 things cause most permanent ocean currents?

A
  1. The sun warming ocean water at the equator
  2. The earth’s rotation
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14
Q

What direction do rip currents flow compared to shore?

A

Perpendicular to shore

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15
Q

Where should you swim to get out of a rip current?

A

Parallel to shore

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16
Q

How do we measure wave height?

A

From the crest to the trough

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17
Q

How do we measure wave length?

A

Crest to crest

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18
Q

Long shore currents can be created by what four things?

A
  1. Wind
  2. Tides
  3. Waves
  4. Nearby ocean currents
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19
Q

What direction does a long shore current run compared to shore?

A

Parallel to shore

20
Q

Aquatic life injuries are most often a result of?

A

Diver carelesness

21
Q

The most common aquatic life injuries are?

A

Scraps and abrasions

22
Q

Most aquatic bites result from?

A
  1. Preserved threat
  2. Mistaken identity
23
Q

Some animals posses stinging cells called?

A

Nematocysts

24
Q

What should you do if you plan to dive in an unfamiliar environment?

A

Contact your local SDI center

25
Q

What are the three states of buoyancy?

A
  1. Positive
  2. Negative
  3. Neutral
26
Q

___ items float ___ items sink ___ items do neither?

A
  1. Positive
  2. Negative
  3. Neutral
27
Q

How much does ambient pressure increase by for every 10 meters/33 feet of descent in sea water?

A

One atmospheric bar

28
Q

What is the ambient pressure at sea level?

A

One

29
Q

As you descend pressure ___ and volume ___?

A

Pressure increases
Volume decreases

30
Q

What is the pressure at 30 meter under water?

A

4

31
Q

At a depth of 20 meters how much more air will you use than you use at the surface?

A

4

32
Q

How do you prevent an ear squeeze?

A

Equalize early and often

33
Q

What is the #1 rule of scuba?

A

Don’t hold your breath

34
Q

What is the #2 rule of scuba?

A

Equalize early and often

35
Q

What medicine should you not take?

A

Decongestants

36
Q

With what illness should you never dive with?

A

Anything that causes Decongestant

37
Q

How do you prevent and tooth squeeze?

A

Regular dental care

38
Q

How do you prevent a mask squeeze?

A

Exhale through your nose

39
Q

When might you suffer a reverse block?

A

During acent

40
Q

What should you do when you occur against a reverse block?

A

Go down and equalize

41
Q

What does holding your breath put you at risk of?

A

Lung explosion

42
Q

What causes an ear squeeze?

A

Pressure inside ear is less than surrounding pressure

43
Q

What should you do if you cannot inhale while diving?

A

Continue exhaling

44
Q

What should you do if you feel pain during descent?

A

Go up Equalize Decend

45
Q

A scuba cylinder than normally last at the surface will last ___ minutes at 20 meters?

A

20 minutes

46
Q

What should you do before descent?

A

Equalize

School 2022-2023 (17 decks)

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