IDC Dive Physiology & Medical Considerations

Question 1

Which law explains why a diver's lungs can overexpand if they hold their breath during ascent?

Accepted Answer

Boyle's Law

Answer

Henry's Law

Answer

Dalton's Law

Answer

Charles's Law

Question 2

Type II (serious) decompression sickness (DCS) is distinguished from Type I primarily by the involvement of:

Accepted Answer

The nervous system, lungs, or cardiovascular system

Answer

Joint and muscle pain only

Answer

Skin mottling and itching

Answer

Lymphatic swelling

Question 3

A diver experiencing euphoria, impaired judgment, and slowed reaction time at depth is most likely suffering from:

Accepted Answer

Nitrogen narcosis

Answer

Oxygen toxicity

Answer

Carbon dioxide buildup

Answer

Hypoglycemia

Question 4

The primary recommended treatment for decompression sickness in the field before reaching a hyperbaric chamber is:

Accepted Answer

100% oxygen breathing

Answer

Aspirin administration

Answer

Immediate resubmersion to 9 meters

Answer

Controlled deep breathing exercises

Question 5

According to PADI standards, what is the maximum recommended ascent rate for recreational divers?

Accepted Answer

9 meters (30 feet) per minute

Answer

18 meters (60 feet) per minute

Answer

5 meters (16 feet) per minute

Answer

25 meters (80 feet) per minute

Question 6

Which physiological law explains why a diver must breathe more gas molecules per breath at greater depths to fill their lungs?

Accepted Answer

Dalton's Law

Answer

Boyle's Law

Answer

Henry's Law

Answer

Fick's Law

Question 7

A diver performing repetitive dives needs to account for residual nitrogen primarily because:

Accepted Answer

Residual nitrogen from prior dives adds to nitrogen absorbed on subsequent dives

Answer

Nitrogen changes the buoyancy of the diver

Answer

Nitrogen becomes toxic after multiple exposures

Answer

Surface intervals eliminate all residual nitrogen