PADI Diving Theory & Safety 3

Question 1

Henry's Law is most relevant to diving because it explains:

Accepted Answer

How gases dissolve into liquids under pressure

Answer

How gas volume changes with depth

Answer

How gas pressure changes with temperature

Answer

How light refracts underwater

Question 2

Dalton's Law of Partial Pressures states that the total pressure of a gas mixture equals:

Accepted Answer

The sum of the partial pressures of each individual gas

Answer

The pressure of the most abundant gas

Answer

The average pressure of all component gases

Answer

The product of all component gas pressures

Question 3

A diver experiences vision disturbances and convulsions underwater. This is most likely caused by:

Accepted Answer

Oxygen toxicity (CNS toxicity)

Answer

Nitrogen narcosis

Answer

Carbon monoxide poisoning

Answer

Hypercapnia

Question 4

What is the maximum operating depth (MOD) for EAN32 (Nitrox with 32% oxygen) based on a ppO₂ limit of 1.4 ATA?

Accepted Answer

33.75 meters

Answer

30 meters

Answer

40 meters

Answer

28.4 meters

Question 5

Which condition describes the 'rapture of the deep' experienced by divers breathing compressed air at depth?

Accepted Answer

Nitrogen narcosis

Answer

Oxygen toxicity

Answer

Hypercapnia

Answer

Decompression sickness

Question 6

What fraction of the water surface is illuminated by light absorbed at approximately 10 meters depth?

Accepted Answer

Red wavelengths are completely absorbed

Answer

Blue wavelengths are completely absorbed

Answer

All colors are equally absorbed

Answer

Green wavelengths are the first to disappear

Question 7

During a dive, a buddy notices the diver's SPG reads 50 bar. According to the rule of thirds, what action should be taken?

Accepted Answer

Signal to the buddy and begin a normal ascent

Answer

Continue diving normally since air remains

Answer

Begin ascending immediately as this is the reserve

Answer

Switch to the alternate air source