Idc Exam Questions

Front 1

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

Back 1

Skin Diver

Front 2

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

Salty Water, Pressure, Density, or Lung Capactiy

Back 2

Pressure

Front 3

What are the two basic parts of a regulator called?

Back 3

First and second stage

Front 4

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

Density, speed, pressure, or volume?

Back 4

Pressure

Front 5

At what depth will you reach 2ATM of pressure?

Back 5

33 ft or 10m

Front 6

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.

Back 6

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

Front 7

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

Back 7

18 hours

Front 8

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

Back 8

4 DSD Programs

Front 9

Underwater, most sounds seems to come from where?

Back 9

Overhead

Front 10

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

Back 10

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

Front 11

What percentage of air is oxygen?

Back 11

21%

Front 12

What are Heat Exhaustion Signs and Symptoms?

Back 12

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

Front 13

What is a visual inspection?

Back 13

Checks for damage and wear / allows for maintenance and lubrication

Front 14

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

Back 14

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

Front 15

When do waves break ?

Back 15

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

Front 16

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

Back 16

Due to adjusting the band while it was dry

Front 17

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

Back 17

Halftime

Front 18

What are waves caused by?

Back 18

Wind

Front 19

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

Back 19

Wind and the earth's rotation.

Front 20

What causes Tides?

Back 20

Gravitational pull of the Earth and the Moon.

Front 21

What are the Signs and Symptoms of Oxygen Toxicity?

Back 21

VENTID (look up)

Front 22

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.

Back 22

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

Front 23

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

Back 23

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

Front 24

Decompression Sickness types and general areas affected?

Back 24

DCS1 Pain Only
DCS2 Nervous System

Front 25

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

Back 25

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

Front 26

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

Back 26

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

Front 27

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?

Back 27

61 Min

Front 28

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?

Back 28

1 hour and 4 minutes

Front 29

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?

Back 29

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

Front 30

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?

Back 30

61 Min

Front 31

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?

Back 31

1 hr, 4 min

Front 32

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?

Back 32

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

Front 33

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

Back 33

you are feeling a squeeze and need to equalize.

Front 34

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

Back 34

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

Front 35

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

Back 35

e) a, c and d

Front 36

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

Back 36

d) never

Front 37

Heat Stroke –What do you do ?

Back 37

Cool diver and get him to medical aid station

Front 38

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

Back 38

Hypothermia and heat stroke

Front 39

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

Back 39

Ear - Round window rupture

Front 40

What is the most important rule in scuba diving?

Back 40

Breathe continuously and never hold your breath.

Front 41

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

Back 41

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

Front 42

You know you are properly weighted for diving if you:

Back 42

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

Front 43

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

Back 43

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

Front 44

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

Back 44

Dive in the direction of the current

Front 45

Best time to dive ?

Back 45

Slack tide after a high tide

Front 46

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

Back 46

Absolute and Ambient 4.3 ATA / Gauge 3.3 ATM

Front 47

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)

Back 47

104 liters/4 cf

Front 48

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)

Back 48

2.2 liters

Front 49

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)

Back 49

9bar/128psi

Front 50

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

Back 50

.84 ata

Front 51

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

Back 51

decompression sickness

Front 52

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

Back 52

c. unchanged

Front 53

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?

Back 53

PO2= .77 ata PN2= 1.63 ata