NAUI Diving Physics & Physiology

Question 1

What happens to air volume in the lungs as a diver ascends?

Accepted Answer

Air volume increases

Answer

Air volume decreases.

Answer

Air volume remains the same.

Answer

Air volume is unaffected by pressure.

Question 2

Which gas law best explains the risk of lung overexpansion during ascent?

Accepted Answer

Boyle’s Law

Answer

Dalton’s Law

Answer

Henry’s Law

Answer

Charles’s Law

Question 3

Why is nitrogen narcosis a concern for deep divers?

Accepted Answer

It impairs cognitive function

Answer

It increases oxygen intake.

Answer

It causes hypothermia.

Answer

It improves reaction time.

Question 4

Which condition results from rapid ascent without proper decompression?

Accepted Answer

Decompression sickness

Answer

Oxygen toxicity

Answer

Nitrogen narcosis

Answer

Carbon monoxide poisoning

Question 5

What physiological effect can occur when diving below 100 feet?

Accepted Answer

Greater risk of narcosis and toxicity

Answer

Improved vision

Answer

Decreased oxygen consumption

Answer

Increased metabolism

Question 6

What does Henry’s Law state about gases in liquid?

Accepted Answer

Gases dissolve in liquid based on pressure

Answer

Gases contract when cooled.

Answer

Gases expand with temperature.

Answer

Gas solubility is unrelated to pressure.

Question 7

What is the primary concern of oxygen toxicity in diving?

Accepted Answer

Seizures

Answer

Muscle cramps

Answer

Mild dizziness

Answer

Dehydration

Question 8

How does water pressure affect a diver’s body?

Accepted Answer

It compresses air spaces and increases nitrogen absorption

Answer

It has no impact.

Answer

It decreases metabolism.

Answer

It reduces heart rate permanently.

Question 9

What is barotrauma in diving?

Accepted Answer

Tissue damage due to pressure differences

Answer

Heatstroke during dives

Answer

Overhydration

Answer

Dehydration