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

Henry's Law states that the amount of gas dissolved in a liquid is proportional to the partial pressure of that gas, explaining nitrogen absorption during diving.

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

Dalton's Law states total gas pressure equals the sum of each individual gas's partial pressure in the mixture.

Question 3

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

Accepted Answer

Oxygen toxicity (CNS toxicity)

Answer

CNS oxygen toxicity causes visual disturbances, twitching, and convulsions when the partial pressure of oxygen exceeds safe limits.

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

MOD = [(ppO₂ limit / FO₂) - 1] × 10m = [(1.4/0.32) - 1] × 10 = 33.75 meters.

Question 5

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

Accepted Answer

Nitrogen narcosis

Answer

Nitrogen narcosis ('rapture of the deep') causes impaired judgment and euphoria similar to alcohol intoxication, typically below 30 meters on air.

(PADI) Certified Professional Association of Diving Instructors Diver Practice Test

(PADI) Certified Professional Association of Diving Instructors Diver Practice Test

PADI Diving Theory & Safety 3