PADI Diving Theory & Safety 2

Question 1

A diver ascends too quickly from 30 meters. Which condition is MOST likely to result?

Accepted Answer

Decompression sickness

Answer

Rapid ascent allows dissolved nitrogen to form bubbles in tissues and blood, causing decompression sickness.

Question 2

What is the purpose of the 'safety stop' recommended by PADI at 5 meters for 3 minutes?

Accepted Answer

To reduce the risk of decompression sickness

Answer

A safety stop at 5 meters for 3 minutes allows excess nitrogen to off-gas safely before surfacing.

Question 3

Boyle's Law states that at a constant temperature, the volume of a gas is:

Accepted Answer

Inversely proportional to absolute pressure

Answer

Boyle's Law: as pressure increases, volume decreases proportionally (P₁V₁ = P₂V₂ at constant temperature).

Question 4

Which gas law explains why a diver's lungs could rupture if they hold their breath during ascent?

Accepted Answer

Boyle's Law

Answer

Boyle's Law explains that trapped gas expands as pressure decreases during ascent, potentially rupturing the lungs.

Question 5

What does a dive computer's 'no-decompression limit' (NDL) indicate?

Accepted Answer

The maximum time at depth before mandatory decompression stops are required

Answer

The NDL is the maximum time a diver can spend at a given depth without requiring decompression stops on ascent.

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