PADI Diving Theory & Safety 4

Question 1

What is the purpose of an alternate air source (octopus) in recreational diving?

Accepted Answer

To supply air to a buddy who has run out of breathing gas

Answer

The alternate air source (octopus) allows an out-of-air diver to breathe from their buddy's tank during a controlled ascent.

Question 2

When equalizing ear pressure during descent, a diver should:

Accepted Answer

Equalize early and often before discomfort occurs

Answer

Equalizing early and frequently during descent prevents barotrauma by keeping the eustachian tubes open before pressure builds.

Question 3

A diver at 20 meters depth on air is breathing at what absolute pressure?

Accepted Answer

3 ATA

Answer

Absolute pressure = surface pressure + water pressure = 1 ATA + (20m/10m per ATA) = 3 ATA.

Question 4

What does a BCD (Buoyancy Control Device) primarily help a diver achieve?

Accepted Answer

Neutral buoyancy at depth and positive buoyancy at surface

Answer

The BCD allows divers to achieve neutral buoyancy underwater for effortless hovering and positive buoyancy at the surface for resting.

Question 5

If a diver surfaces with a headache, fatigue, and cherry-red skin coloration after filling tanks from a vehicle exhaust source, the cause is likely:

Accepted Answer

Carbon monoxide poisoning

Answer

Cherry-red skin, headache, and fatigue are classic signs of carbon monoxide poisoning from contaminated breathing gas.

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