DIVEMASTER FINAL EXAM A
QUESTIONS AND ANSWERS
1. How much more dense is the air in a diver’s lungs at a depth of 30 meters (99 feet)
compared to the surface?
A. 2 times
B. 3 times
C. 5 times
D. 4 times
Answer: D
Conceptual Explanation: At 30 meters, the total pressure is 4 atmospheres (1 atm from
the air + 3 atm from the water). According to Boyle’s Law, density increases proportionally
with pressure, so it is 4 times denser.
2. An object that is neutrally buoyant in fresh water will likely ______ in salt water.
A. Sink
B. Remain neutrally buoyant
C. Float
D. It depends on the temperature
,Answer: C
Conceptual Explanation: Salt water is denser than fresh water. Because the object
displaces the same volume of water, it will displace a greater weight of salt water,
providing more upward buoyant force.
3. Which gas law describes the relationship between the total pressure of a gas mixture and
the partial pressures of its individual components?
A. Dalton’s Law
B. Henry’s Law
C. Boyle’s Law
D. Charles’s Law
Answer: A
Conceptual Explanation: Dalton’s Law states that the total pressure exerted by a mixture
of gases is equal to the sum of the partial pressures of each individual gas.
4. What is the primary cause of decompression sickness (DCS)?
A. Excessive carbon dioxide buildup
B. Nitrogen bubbles forming in body tissues
C. Lung overexpansion due to breath-holding
D. Contaminated air in the cylinder
Answer: B
, Conceptual Explanation: DCS is caused by nitrogen coming out of solution and forming
bubbles in the blood or tissues when a diver ascends too quickly or stays too long.
5. If a flexible container with 6 liters of air is taken from the surface to a depth of 20 meters
(66 feet), what will its volume be?
A. 2 liters
B. 3 liters
C. 4 liters
D. 1 liter
Answer: A
Conceptual Explanation: At 20 meters, the pressure is 3 atm. According to Boyle’s Law
(P1V1=P2V2), 6 liters / 3 atm = 2 liters.
6. Which part of the circulatory system is responsible for the exchange of gases and nutrients
between the blood and the tissues?
A. Arteries
B. Veins
C. Capillaries
D. Alveoli
Answer: C
QUESTIONS AND ANSWERS
1. How much more dense is the air in a diver’s lungs at a depth of 30 meters (99 feet)
compared to the surface?
A. 2 times
B. 3 times
C. 5 times
D. 4 times
Answer: D
Conceptual Explanation: At 30 meters, the total pressure is 4 atmospheres (1 atm from
the air + 3 atm from the water). According to Boyle’s Law, density increases proportionally
with pressure, so it is 4 times denser.
2. An object that is neutrally buoyant in fresh water will likely ______ in salt water.
A. Sink
B. Remain neutrally buoyant
C. Float
D. It depends on the temperature
,Answer: C
Conceptual Explanation: Salt water is denser than fresh water. Because the object
displaces the same volume of water, it will displace a greater weight of salt water,
providing more upward buoyant force.
3. Which gas law describes the relationship between the total pressure of a gas mixture and
the partial pressures of its individual components?
A. Dalton’s Law
B. Henry’s Law
C. Boyle’s Law
D. Charles’s Law
Answer: A
Conceptual Explanation: Dalton’s Law states that the total pressure exerted by a mixture
of gases is equal to the sum of the partial pressures of each individual gas.
4. What is the primary cause of decompression sickness (DCS)?
A. Excessive carbon dioxide buildup
B. Nitrogen bubbles forming in body tissues
C. Lung overexpansion due to breath-holding
D. Contaminated air in the cylinder
Answer: B
, Conceptual Explanation: DCS is caused by nitrogen coming out of solution and forming
bubbles in the blood or tissues when a diver ascends too quickly or stays too long.
5. If a flexible container with 6 liters of air is taken from the surface to a depth of 20 meters
(66 feet), what will its volume be?
A. 2 liters
B. 3 liters
C. 4 liters
D. 1 liter
Answer: A
Conceptual Explanation: At 20 meters, the pressure is 3 atm. According to Boyle’s Law
(P1V1=P2V2), 6 liters / 3 atm = 2 liters.
6. Which part of the circulatory system is responsible for the exchange of gases and nutrients
between the blood and the tissues?
A. Arteries
B. Veins
C. Capillaries
D. Alveoli
Answer: C
