DIVEMASTER FINAL EXAM A
QUESTIONS AND ANSWERS 2026
1. If a diver takes a balloon filled with 4 liters of air from the surface to a depth of 30 meters
(99 feet) in seawater, what will the volume of the balloon be?
A. 0.5 liters
B. 2 liters
C. 1.33 liters
D. 1 liter
Answer: D
Conceptual Explanation: At 30 meters, the ambient pressure is 4 atmospheres (1 at the
surface plus 1 for every 10 meters). According to Boyle’s Law, volume is inversely
proportional to pressure: 4 liters / 4 atm = 1 liter.
2. Which of the following describes the ‘M-value’ in decompression theory?
A. The minimum depth a diver can ascend to without suffering DCS.
B. The maximum allowable pressure gradient for a specific tissue compartment.
C. The mean time it takes for nitrogen to leave the blood.
D. The measurement of metabolic oxygen consumption during a dive.
,Answer: B
Conceptual Explanation: The M-value (Maximum value) represents the maximum partial
pressure of nitrogen a theoretical tissue compartment can tolerate at a given depth before
a diver risks decompression sickness upon ascent.
3. What is the primary role of a Divemaster when assisting an instructor with a group of
student divers?
A. Providing additional supervision and logistics support.
B. Evaluating student skills for certification.
C. Signing off on training records for the students.
D. Replacing the instructor if the group is too large.
Answer: A
Conceptual Explanation: A Divemaster’s primary role is to assist the instructor by
providing supervision, handling logistics, and recognizing potential problems, but they do
not evaluate skills for certification.
4. A diver using EANx32 (32% oxygen) at a depth of 30 meters (99 feet) is breathing what
partial pressure of oxygen (PO2)?
A. 1.60 ata
B. 1.28 ata
C. 0.96 ata
, D. 1.44 ata
Answer: B
Conceptual Explanation: Pressure at 30m = 4 ata. PO2 = Total pressure × fraction of gas. 4
ata × 0.32 = 1.28 ata.
5. Which medical condition occurs when a diver holds their breath during ascent, causing air
to be forced into the chest cavity between the lungs and the ribs?
A. Mediastinal emphysema
B. Subcutaneous emphysema
C. Arterial Gas Embolism
D. Pneumothorax
Answer: D
Conceptual Explanation: Pneumothorax is the collapse of a lung caused by air entering
the pleural cavity (space between the lung and chest wall).
6. If an object is neutrally buoyant in saltwater, what will happen when it is placed in
freshwater?
A. It will sink.
B. It will float.
C. It will remain neutrally buoyant.
D. It will expand.
QUESTIONS AND ANSWERS 2026
1. If a diver takes a balloon filled with 4 liters of air from the surface to a depth of 30 meters
(99 feet) in seawater, what will the volume of the balloon be?
A. 0.5 liters
B. 2 liters
C. 1.33 liters
D. 1 liter
Answer: D
Conceptual Explanation: At 30 meters, the ambient pressure is 4 atmospheres (1 at the
surface plus 1 for every 10 meters). According to Boyle’s Law, volume is inversely
proportional to pressure: 4 liters / 4 atm = 1 liter.
2. Which of the following describes the ‘M-value’ in decompression theory?
A. The minimum depth a diver can ascend to without suffering DCS.
B. The maximum allowable pressure gradient for a specific tissue compartment.
C. The mean time it takes for nitrogen to leave the blood.
D. The measurement of metabolic oxygen consumption during a dive.
,Answer: B
Conceptual Explanation: The M-value (Maximum value) represents the maximum partial
pressure of nitrogen a theoretical tissue compartment can tolerate at a given depth before
a diver risks decompression sickness upon ascent.
3. What is the primary role of a Divemaster when assisting an instructor with a group of
student divers?
A. Providing additional supervision and logistics support.
B. Evaluating student skills for certification.
C. Signing off on training records for the students.
D. Replacing the instructor if the group is too large.
Answer: A
Conceptual Explanation: A Divemaster’s primary role is to assist the instructor by
providing supervision, handling logistics, and recognizing potential problems, but they do
not evaluate skills for certification.
4. A diver using EANx32 (32% oxygen) at a depth of 30 meters (99 feet) is breathing what
partial pressure of oxygen (PO2)?
A. 1.60 ata
B. 1.28 ata
C. 0.96 ata
, D. 1.44 ata
Answer: B
Conceptual Explanation: Pressure at 30m = 4 ata. PO2 = Total pressure × fraction of gas. 4
ata × 0.32 = 1.28 ata.
5. Which medical condition occurs when a diver holds their breath during ascent, causing air
to be forced into the chest cavity between the lungs and the ribs?
A. Mediastinal emphysema
B. Subcutaneous emphysema
C. Arterial Gas Embolism
D. Pneumothorax
Answer: D
Conceptual Explanation: Pneumothorax is the collapse of a lung caused by air entering
the pleural cavity (space between the lung and chest wall).
6. If an object is neutrally buoyant in saltwater, what will happen when it is placed in
freshwater?
A. It will sink.
B. It will float.
C. It will remain neutrally buoyant.
D. It will expand.
