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53 Cards in this Set

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Which program has an Open water Dive Ration of 10:1?

Skin Diver

According to Henry's law, what causes something to absorb more gases into solution?



Salty Water, Pressure, Density, or Lung Capactiy

Pressure

What are the two basic parts of a regulator called?

First and second stage

According to Charles' law, what increases as the temperature of a gas increases?



Density, speed, pressure, or volume?

Pressure

At what depth will you reach 2ATM of pressure?

33 ft or 10m

To reduce the risk of DCS...


A) ascend to a shallower depth if you feel dizzy and thirsty; B) have your tank filled only at a dive center you trust; C) breather more slowly than normal using nitrox; D) make a safety stop at 5m at the end of each dive; or E) use nitrox/enriched air on every dive.

D) Make a safety stop at 5 meters at the end of each dive

You make two dives in one day and you are flying home on a commercial plan. What is the minimum time you have to wait before you can go on the plane?



36 hours, 24 hours, 18 hours, or you don't have to wait

18 hours

Certified DMs must complete how many DSD internships to be qualified to conduct them?

4 DSD Programs

Underwater, most sounds seems to come from where?

Overhead

In an out-of-air situation, what is the best thing to do?

Switch to your buddy's alternate air source - remember to sign out of air

What percentage of air is oxygen?

21%

What are Heat Exhaustion Signs and Symptoms?

Weak, rapid breathing, weak rapid pulse, profuse sweating, skin cool and clammy, nausea

What is a visual inspection?

Checks for damage and wear / allows for maintenance and lubrication

How does a transducer work and where would you find one?

Varying an electrical current depending on the pressure exerted on it – Dive Computers have transducers in them

When do waves break ?

Waves Break when approaching the shore – When the depth is the same height as the wave

What is the most common reason for Cylinders slipping in nylon tank bands?

Due to adjusting the band while it was dry

The rate at which a theoretical tissue absorbs and releases nitrogen is called its?

Halftime

What are waves caused by?

Wind

What causes currents in the bodies of water around the world?

Wind and the earth's rotation.

What causes Tides?

Gravitational pull of the Earth and the Moon.

What are the Signs and Symptoms of Oxygen Toxicity?

VENTID (look up)

Imagine you were diving from a dive boat (common in most dive resorts) and get caught in a strong current at the surface. Should you? a) Descend (go down) and try to swim against the current near the bottom; b) Make yourself buoyant / float, then signal the boat for help, and try to swim against the current; c) Make yourself positively buoyant and float, signal for help, rest and wait for the boat to pick you up.
d) Try to swim against the current by staying just below the surface.

c) Make yourself positively buoyant and float, signal for help, rest and wait for the boat to pick you up.

Most scuba diving injuries caused by fish and aquatic animals happen because:

a) the marine animal is trying to protect itself and is scared of you

Decompression Sickness types and general areas affected?

DCS1 Pain Only
DCS2 Nervous System

Divers who act strangely or foolishly at depth may start acting normal again if they:

b) ascend (go up) to a shallower depth.

Its possible that you will chances of getting decompression sickness (DCS) are increases if:

b) you are tired, cold, sick, thirsty or overweight.

METRIC — RDP table or eRDP: You dive to 17 metres for 23 minutes. After a 30 minute surface interval, you plan to dive to 16 metres. What is the maximum allowable time for the second dive?

61 Min

RDP table or eRDP: You are a newly qualified instructor and you are planning to make two dives. The first dive is to 21 metres for 30 minutes, and the second dive is to 15 metres for 36 minutes. How long would you have to stay on the surface between dives (minimum surface interval) to do these two dives safely?

1 hour and 4 minutes

METRIC — RDP table or eRDP: You dive to 17 metres for 44 minutes. After a one hour surface interval you do a second dive to 17 metres. Losing track of time, you notice your bottom time is now 37 minutes. What should you do?

Ascend (go up) right away to 5 metres and stay there for 8 minutes before going to the surface.

IMPERIAL — RDP table or eRDP: You dive to 59 feet for 22 minutes. After a 30 minute surface interval, you plan to dive to 50 feet. What is the maximum allowable time for the second dive?

61 Min

IMPERIAL — RDP table or eRDP: You are a newly qualified instructor and you are planning to make two dives. The first dive is to 21 metres for 30 minutes, and the second dive is to 15 metres for 36 minutes. How long would you have to stay on the surface between dives (minimum surface interval) to do these two dives safely?

1 hr, 4 min

IMPERIAL — RDP table or eRDP: You dive to 17 metres for 44 minutes. After a one hour surface interval you do a second dive to 17 metres. Losing track of time, you notice your bottom time is now 37 minutes. What should you do?

Ascend (go up) right away to 5 metres and stay there for 8 minutes before going to the surface.

If you descend and then you find your ears or sinuses hurt while you are going down, it normally means:

you are feeling a squeeze and need to equalize.

You should not even consider diving if you currently have a cold or are suffering from any allergies because:

you may not be able to equalize pressure in your body air spaces.

If you hold your breath while scuba diving can:


a) damage your lungs
b) preserve your air so you can dive for longer
c) push air into the blood stream and chest area.
d) give yourself life threatening injuries.
e) a, c and d

e) a, c and d

You should skip breath when:


a) you want to preserve your air
b) your buddy is better at preserving his or her air
c) tank refils are expensive in your area
d) never

d) never

Heat Stroke –What do you do ?

Cool diver and get him to medical aid station

What are the conditions caused by the failure of body's temp maintenance systems?

Hypothermia and heat stroke


A forceful Valsalva and delayed middle ear equalisation can cause what ?

Ear - Round window rupture

What is the most important rule in scuba diving?

Breathe continuously and never hold your breath.

If you are having to work too hard and find it difficult to breathe underwater, you should:

stop your diving and rest, hold onto something for support if possible.

You know you are properly weighted for diving if you:

float at eye level holding a normal breath of air with an empty BCD.

If you and your dive buddy were separated / couldn't find each other underwater what would you generally do?

Search for a minute underwater and then go up to find your buddy.

Imagine you feel a mild current at the start of your dive. How should you begin this dive?

Dive in the direction of the current

Best time to dive ?

Slack tide after a high tide

What is the water pressure at 34m in Fresh water (.97) ?

Absolute and Ambient 4.3 ATA / Gauge 3.3 ATM

You plan to recover an anchor in sea water that weights 200kg/450lbs. It displaces 90 liters/3 cubic feet of water. How many liters/cubic feet of air do you need to add to a lifting device to make the anchor neutrally buoyant? (Round to the closest whole liter/cubic foot)

104 liters/4 cf

You take 4.7 liters of a gas in a flexible container from 7 meters/23 feet in sea water to 26 meters/85 feet. What will the new volume be? (Round to one decimal place)

2.2 liters

A diver consumes 4 bar/60 psi per minute at 10 meters/33 feet in sea water with a given cylinder. Using the same cylinder, what is the diver’s consumption rate at 33 meters/108 feet? (Round to the closest whole bar/psi)

9bar/128psi

What is the partial pressure of oxygen in air at 30 meters/99 feet in sea water? (Round ata to two decimal places)

.84 ata

The phenomena of the dissolution and release of gases from liquids explains the physiological mechanism of:

1. Oxygen toxicity
2. Nitrogen narcosis
3. decompression sickness
4. arterial gas embolism

decompression sickness

If we take a full scuba tank down to 3 ata, what would its new volume be?


a. four times its original volume
b. one-fourth its original volume
c. unchanged
d. one-half its original volume

c. unchanged

A diver is using enriched air that consists of 32% oxygen, 68% nitrogen. What will the partial pressures of oxygen and nitrogen be at a depth of 14 meters/46 feet in sea water?

PO2= .77 ata PN2= 1.63 ata