Scuba

Question 1

Underwater objects appear how much closer?

Answer 1

25%

Question 2

Underwater objects appear how much larger?

Answer 2

1/3

Question 3

As you descend what colors disappear first?

Answer 3

Reds and oranges

Question 4

How much denser is water than air?

Answer 4

800x denser

Question 5

How much faster does sound move in water?

Answer 5

4x faster

Question 6

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

Answer 6

25x faster

Question 7

When should you wear thermal protection?

Answer 7

Always

Question 8

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

Answer 8

Thermocline

Question 9

What is the primary cause of waves?

Answer 9

Wind

Question 10

What forms surf?

Answer 10

The bottom of the wave slows causing the wave to break

Question 11

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

Answer 11

Surge

Question 12

Tides can affect what three things?

Answer 12

Depth, current, visibility

Question 13

What 2 things cause most permanent ocean currents?

Answer 13

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

Question 14

What direction do rip currents flow compared to shore?

Answer 14

Perpendicular to shore

Question 15

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

Answer 15

Parallel to shore

Question 16

How do we measure wave height?

Answer 16

From the crest to the trough

Question 17

How do we measure wave length?

Answer 17

Crest to crest

Question 18

Long shore currents can be created by what four things?

Answer 18

1. Wind
2. Tides
3. Waves
4. Nearby ocean currents

Question 19

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

Answer 19

Parallel to shore

Question 20

Aquatic life injuries are most often a result of?

Answer 20

Diver carelesness

Question 21

The most common aquatic life injuries are?

Answer 21

Scraps and abrasions

Question 22

Most aquatic bites result from?

Answer 22

1. Preserved threat
2. Mistaken identity

Question 23

Some animals posses stinging cells called?

Answer 23

Nematocysts

Question 24

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

Answer 24

Contact your local SDI center

Question 25

What are the three states of buoyancy?

Answer 25

1. Positive 2. Negative 3. Neutral

Question 26

___ items float ___ items sink ___ items do neither?

Answer 26

1. Positive 2. Negative 3. Neutral

Question 27

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

Answer 27

One atmospheric bar

Question 28

What is the ambient pressure at sea level?

Answer 28

One

Question 29

As you descend pressure ___ and volume ___?

Answer 29

Pressure increases Volume decreases

Question 30

What is the pressure at 30 meter under water?

Answer 30

4

Question 31

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

Answer 31

4

Question 32

How do you prevent an ear squeeze?

Answer 32

Equalize early and often

Question 33

What is the #1 rule of scuba?

Answer 33

Don't hold your breath

Question 34

What is the #2 rule of scuba?

Answer 34

Equalize early and often

Question 35

What medicine should you not take?

Answer 35

Decongestants

Question 36

With what illness should you never dive with?

Answer 36

Anything that causes Decongestant

Question 37

How do you prevent and tooth squeeze?

Answer 37

Regular dental care

Question 38

How do you prevent a mask squeeze?

Answer 38

Exhale through your nose

Question 39

When might you suffer a reverse block?

Answer 39

During acent

Question 40

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

Answer 40

Go down and equalize

Question 41

What does holding your breath put you at risk of?

Answer 41

Lung explosion

Question 42

What causes an ear squeeze?

Answer 42

Pressure inside ear is less than surrounding pressure

Question 43

What should you do if you cannot inhale while diving?

Answer 43

Continue exhaling

Question 44

What should you do if you feel pain during descent?

Answer 44

Go up Equalize Decend

Question 45

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

Answer 45

20 minutes

Question 46

What should you do before descent?

Answer 46

Equalize