PADI Instructor Development Course (IDC)
Koh Tao, Thailand

Question 1 of 30

Factors that influence a diver's susceptibility to decompression sickness include?

• Dehydration
• Strenuous exercise during or after a dive
• Recent illness or injury
• All of the above are correct

Question 2 of 30

A diver experiencing nitrogen narcosis may have?

• Cherry red lips and nail beds
• Laboured breathing and complain of headache and nausea
• A false sense of security at depth and display foolish behaviour
• Numbness and tingling, or pain in the joints and limbs

Question 3 of 30

If a full scuba tank is placed outside in the sunlight on a hot, tropical day:

• The volume of the tank will most likely decrease
• The pressure inside the tank will decrease
• The volume of the tank will remain unchanged, but the pressure inside will increase
• The tank's pressure and volume will remain unchanged

Question 4 of 30

Breathing from a tank of 0.2 % carbon monoxide at a depth of 30 meters has the same effect as breathing what percentage at the surface?

• 1%
• 0.2%
• 0.8%
• 10%

Question 5 of 30

A regulator's __________ reduces high pressure from the tank to intermediate pressure and the _________ delivers air to the diver at ambient pressure?

• second stage / first stage
• downstream valve / balanced diaphragm
• demand valve / open circuit
• first stage / second stage

Question 6 of 30

A connection on a scuba tank which allows the regulator to be screwed directly into the tank valve is referred to as?

• Dual tank manifold
• Yoke screw
• DIN
• K valve

Question 7 of 30

The flying after diving rule recommends waiting how many hours before flying after a single dive?

• 18 hours
• 24 hours
• Until in pressure group D
• 12 hours

Question 8 of 30

Using the RDP above ________ requires the use of special procedures including the conversion of actual depth to theoretical depth. To use theoretical depth tables, you must know the __________ .

• 2400 metres / altitude of the dive
• 300 metres / barometric pressure at altitude
• 3000 metres / planned dive depth
• 300 metres / altitude of the dive

Question 9 of 30

A clenched fist brought toward the chest is the standard hand signal for?

• "I'm having chest pains"
• “I’m low on air”
• “I’m out of air”
• “I’m tired”

Question 10 of 30

Tidal movement is the result of ________ while waves are primarily caused by ________.

• The earth's rotation / tropical storms
• Tradewinds / upwelling
• Orbital pattern of the earth / bottom topography
• Gravitational interaction between the sun, moon and earth / wind

Question 11 of 30

An an AGE (arterial gas embolism) is best decribed as:

• A collapsed lung
• Air bubbles in the veins
• Nitrogen bubbles released from solution
• Air bubbles in an artery

Question 12 of 30

How many liters of air are needed, supplied from the surface, to fill a flexible 25L container that lies in 5m salt water

• 25L
• 37.5L
• 50L
• 125L

Question 13 of 30

A burst disk is designed to _______________, and can be found on the _______________

• Reduce the possibility that an over-pressurized tank will explode / SPG
• Reduce the possibility that an over-pressurized BCD will explode / inflator hose
• Reduce the possibility that an over-pressurized cylinder will explode / tank valve
• Reduce the possibility that an over-pressurized regulator will explode / first stage

Question 14 of 30

What guidelines need to be followed when planning a dive with a computer?

• Should not be shared by two or more divers
• Calls for following the same recommendations as when diving with tables
• If both divers have a computer, follow the most conservative
• All of the above

Question 15 of 30

How do you determine correct weighting at the surface?

• The diver holds a deep breath, lets out air from BCD and sinks
• The diver holds a normal breath, lets out air from BCD and floats at chin level
• The diver holds a deep breath, lets out air from BCD and floats at eye level
• The diver holds a normal breath, lets our air from BCD and floats at eye level

Question 16 of 30

Both arms joined above the head on the surface signals?

• Distress
• OK
• Assemble here
• Lost buddy

Question 17 of 30

Which symptoms are most indicative of contaminated air poisoning?

• Numbness and tingling in extremities
• Sore chest
• Nausea and cherry red nail beds
• Foolish behaviour

Question 18 of 30

Which part of the ear is most affected by pressure change?

• Middle ear
• Round window
• Ossicles
• Cochlea

Question 19 of 30

When gas has been absorbed into liquid and the pressure in contact with this liquid decreases, causing super-saturation, what will happen to the gas inside the liquid?

• The gas will remain dissolved
• Bubbles may form
• The percentage of gas will increase
• Partial pressure of gas will increase

Question 20 of 30

An unbalanced regulator is designed so that:

• Tank pressure neither resists nor assists the opening of valves
• Tank pressure assists or resists the opening of valves
• Air is supplied to the first stage at ambient pressure
• Air is reduced to ambient pressure by the first stage

Question 21 of 30

Testing the RDP on a cross section of recreational divers in hyperbaric chambers and in field tests created a table that allows _______________ than traditional Navy tables

• More conservative dive limits
• Greater surface interval credit
• 18 meter per minute ascent rate
• All of the above

Question 22 of 30

Unconsciousness, pain and local swelling are symptoms of?

• DCS
• Shallow water blackout
• Marine life injury
• Visual reversal

Question 23 of 30

Coral has a symbiotic relationship essential to the building of coral reefs, with which organism?

• Damsel fish
• Zooxanthellae
• Coralline algae
• Parrot fish

Question 24 of 30

During an ascent from a breath hold dive, excessive hyperventilation increases the risk of _______________?

• Hypoxia
• Sudden loss of consciousness
• Shallow water blackout
• All of the above

Question 25 of 30

Gas exchange in the circulatory system occurs between the alveoli and _______________?

• Platelets
• Capillaries
• Hemoglobin
• Plasma

Question 26 of 30

Objects appear magnified underwater. This is due to _______________.

• Absorption
• Refraction
• Reflection
• Visual Reversal

Question 27 of 30

High pressure air from a cylinder enters a C-shaped or spiral tube and causes it to straighten somewhat, causing the needle to read pressure, best describes a _______________ .

• Diaphragm gauge
• SPG
• Capillary depth gauge
• Oil-filled gauge

Question 28 of 30

The RDP development found that a 120 minute halftime was too conservative for no stop decompression diving. Using a 60 minute halftime meant that _______________.

• The RDP uses Buhlmann limits
• Pressure group designations are interchangeable between the USN table and RDP
• The RDP allowed longer no decompression limits.
• The RDP offered twice as much credit for surface interval than the USN table.

Question 29 of 30

Raising objects heavier than _______________ require the use of a lifting device

• 10.5-13 kg
• 8-10 kg
• 7-7.5 kg
• 4-7 kg

Question 30 of 30

The maximum allowable partial pressure of oxygen during a basic Enriched Air dive is?

• 1.4pp
• 1.6pp
• 1.8pp
• There is no limit

You scored out of 30!

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