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DM > PADI IDC Example Questions from IDC Guide > Flashcards

PADI IDC Example Questions from IDC Guide Flashcards

1
Q

How many confined water sessions and open water sessions are there in an Open Water course?

A

5 and 4.

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2
Q

To Participate in PADI DSD experience the participant must do what?

A

Read / Sign a Liability release and assumption of risk form.

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3
Q

What is the normal full pressure of a recreational scuba tank?

A

200 bar / 3000 PSI (there are 15 psi per bar)

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4
Q

What is the pressure of a tank that began with 200 Bar and was slowly opened and left for hours until it was empty?

A

1 Bar (most people think 0 Bar, but unless you live in a vacuum it’s the normal atmospheric pressure at sea level which is 1 Bar)

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5
Q

Which program has a Open water Dive Ratio of 10:1?

A

Skin Diver

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6
Q

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

a. Salty water
b. Pressure
c. Density
d. Lung Capacity

A

b. Pressure

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7
Q

What are the two basic parts of a regulator called?

A

The two basic parts of a regulator are called the first and second stage.

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8
Q

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

a. Salty water
b. Pressure
c. Density
d. Lung Capacity

A

b. Pressure

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9
Q

At what depth will you reach 2ATM of pressure?

A

33ft or 10m

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10
Q

To reduce the risk of decompression sickness (DCS – nitrogen bubbles blocking blood circulation/flow in your body after a dive):

a) ascend (go up) to a shallower depth if you feel dizzy and thirsty.
b) have your tank filled only at a dive center you trust.
c) breathe more slowly than normal using Nitrox.
d) make a safety stop at 5 metres (15 feet) at the end of each dive.
e) use Nitrox / Enriched Air on every dive.

A

d) make a safety stop at 5 metres (15 feet) at the end of each dive.

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11
Q

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

a) 36 hours.
b) 24 hours.
c) You do not have to wait.
d) 18 hours.

A

d) 18 hours.

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12
Q

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

A

4 DSD Programs.

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13
Q

What is Confined water?

A

Look this one up but its basically a pool or a body of water with pool like conditions.

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14
Q

Underwater most sounds seem to come from where?

A

Overhead

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15
Q

In the unlikely event that you are in an out-of-air situation (OOA), and you are close to your dive buddy, the best thing to do is to:

a) make a controlled emergency swimming ascent (CESA – swim up to the surface saying the ah-h-h sound).
b) buddy breathe (share a single regulator with your buddy).
c) switch to your buddy’s alternate air source – Remember to do the out of air sign.
d) panic and rush to the surface.
e) use the air in your BCD.

A

c) switch to your buddy’s alternate air source – Remember to do the out of air sign.

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16
Q

How do you avoid CNS Oxygen Toxicity?

A

Don’t exceed an oxygen PP of 1.4 ata.

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17
Q

What percentage of Air is Oxygen?

A

21%

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18
Q

What are Heat Exhaustion Signs & Symptoms?

A

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

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19
Q

What is a Visual Inspection?

A

Checks for damage and wear / allows for maintenance and lubrication – is a dive industry standard.

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20
Q

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

A

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

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21
Q

When do waves break?

A

1.3

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22
Q

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

A

Due to adjusting the band while it was dry.

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23
Q

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

A

Halftime

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24
Q

Can you can rely on a Haldanean Deco model?

A

Only as far as it has been shown to work in test and by field experience.

25
Q

What are waves caused by?

A

Wind

26
Q

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

A

Wind and the earth’s rotation.

27
Q

What causes Tides?

A

Gravitational pull of the Earth and the Moon.

Did you know that – Pressure Gradient is greater at Altitude that’s why different procedures must be adopted over 300m.

28
Q

What are the Signs and Symptoms of Oxygen Toxicity?

A

VENTID – Don’t know what that means ? carry on reading your books :) Once you get your Instructor Manual look through the Standards section (at the front) and familiarize yourself with its layout and content, look up stuff like ages for courses, depths etc.

29
Q

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.

A

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

30
Q

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.
b) the animal is aggressive and wants to hurt you.
c) the animal wants to mate with you.
d) the animal thinks you are dinner!

A

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

31
Q

Decompression Sickness types and general areas affected?

A

DCS1 Pain Only.

DCS2 Nervous System.

32
Q

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

a) breathe slowly and deeply.
b) ascend (go up) to a shallower depth.
c) signal their buddy for help.
d) All of the above.

A

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

33
Q

It is possible that your chance of getting decompression sickness (DCS) is increased if:

a) you do not look after your equipment.
b) you are tired, cold, sick, thirsty or overweight.
c) you dive in poor visibility, strong moving water, and rough seas.
d) All of the above.
e) a and c only

A

?? d) All of the above.

34
Q

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?

a) 10 minutes
b) 52 minutes
c) 61 minutes
d) 27 minutes.

A

b) 52 minutes

35
Q

METRIC — 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?

a) 9 minutes.
b) 18 Minutes
c) 29 minutes.
d) Instructors do not need to wait between dives

A

b) 18 Minutes

36
Q

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?

a) Ascend (go up) right away to 5 metres and stay there for 8 minutes before going to the surface.
b) Go to the surface right away and contact the nearest recompression chamber.
c) Ascend (go up) right away to 5 metres and stay there for 3 minutes before going to the surface then drink lots of fizzy drinks on the boat.
d) Ascend (go up) to 3 metres and stay there until you use up your air.

A

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

37
Q

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?

a) 10 minutes.
b) 61 minutes.
c) 29 minutes.
d) 59 minutes.

A

b) 61 minutes.

38
Q

METRIC — 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?

a) 49 minutes.
b) 1 hour and 4 minutes.
c) 2 hour and 32 minutes.
d) Instructors do not need to wait between dives.

A

b) 1 hour and 4 minutes.

39
Q

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

a) your air spaces are equalized (cleared).
b) your mask strap is too tight.
c) you are feeling a squeeze and need to equalize.
d) your mask is too small.
e) hurting ears are fine and you should get used to it as a diver.

A

c) you are feeling a squeeze and need to equalize.

40
Q

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

a) you will get your Doctor in trouble for clearing you to dive.
b) you may become tired or seasick easily.
c) you may not be able to equalize pressure in your body air spaces.
d) you will use your air up too fast.
e) you may become unconscious (dazed, out cold) without warning.

A

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

41
Q

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.

A

e) a, c and d.

42
Q

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 refills are expensive in your area.
d) never.

A

d) never.

43
Q

Heat Stroke - What do you do?

A

Cool diver and get him to medical aid station.

44
Q

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

A

Hypothermia and heat stroke.

45
Q

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

A

Ear – Round window rupture.

46
Q

What is the most important rule in scuba diving? - if you don’t know this give up now :)

a) diving is great at getting rid of hangovers.
b) Always perform a pre dive safety check.
c) Establish positive buoyancy and relax when at the surface.
d) Never dive alone.
e) Breathe continuously and never hold your breath.
f) find cool people to dive with.

A

e) Breathe continuously and never hold your breath.

47
Q

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

a) get to the surface quickly by inflating your BCD.
b) stop your diving and rest, hold onto something for support if possible.
c) swim right away to your buddy and signal for help.
d) do a controlled emergency swimming ascent (CESA – swimming up to the surface giving it the the ahhhh sound).
e) try a different hobby like ping pong.
f) don’t let anyone see as it is embarrassing to suck at diving.

A

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

or ??

c) swim right away to your buddy and signal for help.

48
Q

You know you are properly weighted for diving if you:

a) are the first to the reef from the boat.
b) sink slowly holding a normal breath of air and an empty BCD.
c) float at eye level holding a normal breath of air with an empty BCD.
d) float at neck level with your BCD about half full and you are holding a normal breath of air.
e) descend as slowly as the largest person in your dive party.

A

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

49
Q

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

a) Check your air and tailor your search pattern depending on how much you have left.
b) Find your buddy’s bubbles and follow the bubbles to find your buddy.
c) Go up right away, wait a minute and then go back down underwater.
d) Search for a minute underwater and then go up to find your buddy.
e) Go to the surface right away and get out of the water.

A

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

50
Q

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

a) Drink lots of coffee and fluids as your in for a tough dive.
b) Dive against or into the current.
c) Never dive with a current.
d) Dive in the direction of the current
e) Dive across the current.

A

b) Dive against or into the current.

51
Q

Best time to dive?

A

Slack tide after a high tide.

52
Q

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

A

Absolute and Ambient 4.3 ATA / Gauge 3.3 ATM

53
Q

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)

A

104 liters/4 cf.

54
Q

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)

A

2.2 liters.

55
Q

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 divers consumption rate at 33 meters/108 feet? (Round to the closest whole bar/psi)

A

9bar/128psi.

56
Q

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

A

.84 ata.

57
Q

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

a) Oxygen toxicity.
b) Nitrogen narcosis.
c) Decompression sickness.
d) Arterial gas embolism.

A

c) Decompression sickness.

58
Q

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.

A

c. unchanged.

59
Q

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?

A 
PO2= .77 ata 
PN2= 1.63 ata.

DM (12 decks)

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