DIVEMASTER FINAL EXAM A
QUESTIONS AND ANSWERS 2026
1. What is the primary role of a Divemaster when assisting with a student diver in training?
A. To provide additional supervision and support to students while the instructor is
occupied
B. To evaluate the student’s mastery of skills
C. To act as the primary instructor for the course
D. To sign off on the student’s final certification documents
Answer: A
Conceptual Explanation: A Divemaster’s role in training is to assist the instructor by
providing additional supervision, helping students who may need extra attention, and
handling logistics, rather than teaching or evaluating skills.
2. A balloon is filled with 4 liters of air at the surface and then taken to a depth of 30 meters
(100 feet) in salt water. What will its volume be?
A. 1 liter
B. 2 liters
,C. 0.5 liters
D. 1.33 liters
Answer: A
Conceptual Explanation: According to Boyle’s Law, as pressure increases, volume
decreases proportionately. At 30 meters, the total pressure is 4 ATA. Therefore, the volume
becomes 4 liters divided by 4, which is 1 liter.
3. Which of the following describes the relationship between heat conduction in water
compared to air?
A. Water conducts heat about 5 times slower than air
B. Water conducts heat at the same rate as air
C. Air conducts heat faster because it is less dense
D. Water conducts heat about 20 times faster than air
Answer: D
Conceptual Explanation: Water has a much higher density and thermal conductivity than
air, causing it to draw heat away from the body approximately 20 to 25 times faster than
air does.
4. If a diver is using enriched air nitrox with 32% oxygen at a depth of 30 meters (99 feet) in
salt water, what is the partial pressure of oxygen (PO2)?
A. 0.32 ata
, B. 1.28 ata
C. 1.60 ata
D. 0.96 ata
Answer: B
Conceptual Explanation: At 30m, the total pressure is 4 ATA. PO2 = Fractional O2
concentration x Total Pressure. 0.32 x 4 = 1.28 ATA.
5. Which gas law best explains why a diver’s blood absorbs more nitrogen as they descend to
greater depths?
A. Boyle’s Law
B. Charles’s Law
C. Henry’s Law
D. Dalton’s Law
Answer: C
Conceptual Explanation: Henry’s Law states that at a constant temperature, the amount
of a gas that dissolves into a liquid is directly proportional to the partial pressure of that
gas in contact with the liquid.
6. What is the most likely cause of a diver experiencing a ‘squeeze’ in the middle ear during
descent?
A. The external ear canal is blocked by a tight hood
QUESTIONS AND ANSWERS 2026
1. What is the primary role of a Divemaster when assisting with a student diver in training?
A. To provide additional supervision and support to students while the instructor is
occupied
B. To evaluate the student’s mastery of skills
C. To act as the primary instructor for the course
D. To sign off on the student’s final certification documents
Answer: A
Conceptual Explanation: A Divemaster’s role in training is to assist the instructor by
providing additional supervision, helping students who may need extra attention, and
handling logistics, rather than teaching or evaluating skills.
2. A balloon is filled with 4 liters of air at the surface and then taken to a depth of 30 meters
(100 feet) in salt water. What will its volume be?
A. 1 liter
B. 2 liters
,C. 0.5 liters
D. 1.33 liters
Answer: A
Conceptual Explanation: According to Boyle’s Law, as pressure increases, volume
decreases proportionately. At 30 meters, the total pressure is 4 ATA. Therefore, the volume
becomes 4 liters divided by 4, which is 1 liter.
3. Which of the following describes the relationship between heat conduction in water
compared to air?
A. Water conducts heat about 5 times slower than air
B. Water conducts heat at the same rate as air
C. Air conducts heat faster because it is less dense
D. Water conducts heat about 20 times faster than air
Answer: D
Conceptual Explanation: Water has a much higher density and thermal conductivity than
air, causing it to draw heat away from the body approximately 20 to 25 times faster than
air does.
4. If a diver is using enriched air nitrox with 32% oxygen at a depth of 30 meters (99 feet) in
salt water, what is the partial pressure of oxygen (PO2)?
A. 0.32 ata
, B. 1.28 ata
C. 1.60 ata
D. 0.96 ata
Answer: B
Conceptual Explanation: At 30m, the total pressure is 4 ATA. PO2 = Fractional O2
concentration x Total Pressure. 0.32 x 4 = 1.28 ATA.
5. Which gas law best explains why a diver’s blood absorbs more nitrogen as they descend to
greater depths?
A. Boyle’s Law
B. Charles’s Law
C. Henry’s Law
D. Dalton’s Law
Answer: C
Conceptual Explanation: Henry’s Law states that at a constant temperature, the amount
of a gas that dissolves into a liquid is directly proportional to the partial pressure of that
gas in contact with the liquid.
6. What is the most likely cause of a diver experiencing a ‘squeeze’ in the middle ear during
descent?
A. The external ear canal is blocked by a tight hood
