DIVEMASTER FINAL EXAM A
QUESTIONS AND ANSWERS 2026
1. What is the absolute pressure at a depth of 30 meters (99 feet) in saltwater?
A. 4 bar/ata
B. 3 bar/ata
C. 2 bar/ata
D. 5 bar/ata
Answer: A
Conceptual Explanation: At sea level, the pressure is 1 bar. For every 10 meters of
saltwater, pressure increases by 1 bar. So at 30m, there is 3 bar of water pressure plus 1
bar of air pressure, totaling 4 bar.
2. Sound travels ________ times faster in water than in air.
A. 2
B. 4
C. 10
,D. 20
Answer: B
Conceptual Explanation: Because water is much denser than air, sound waves travel
approximately four times faster underwater.
3. If an object is neutrally buoyant in saltwater, what will happen if it is placed in freshwater?
A. It will remain neutrally buoyant
B. It will float
C. It will sink
D. It will explode
Answer: C
Conceptual Explanation: Freshwater is less dense than saltwater. Since the object
displaces the same volume but the weight of the displaced freshwater is less than the
weight of the saltwater, the object will sink.
4. According to Archimedes’ Principle, an object is buoyed up by a force equal to:
A. The weight of the object itself
B. The density of the object
C. The volume of the object
D. The weight of the fluid displaced
, Answer: D
Conceptual Explanation: Archimedes’ Principle states that any object, wholly or partially
immersed in a fluid, is buoyed up by a force equal to the weight of the fluid displaced by the
object.
5. Which gas law explains why a balloon’s volume decreases as it is taken deeper
underwater?
A. Dalton’s Law
B. Henry’s Law
C. Boyle’s Law
D. Charles’s Law
Answer: C
Conceptual Explanation: Boyle’s Law states that if temperature remains constant, the
volume of a gas is inversely proportional to the pressure.
6. Visual reversal is an underwater phenomenon where an object appears:
A. Smaller than it actually is
B. Closer than it actually is
C. Larger than it actually is
D. Further away than it actually is
Answer: D
QUESTIONS AND ANSWERS 2026
1. What is the absolute pressure at a depth of 30 meters (99 feet) in saltwater?
A. 4 bar/ata
B. 3 bar/ata
C. 2 bar/ata
D. 5 bar/ata
Answer: A
Conceptual Explanation: At sea level, the pressure is 1 bar. For every 10 meters of
saltwater, pressure increases by 1 bar. So at 30m, there is 3 bar of water pressure plus 1
bar of air pressure, totaling 4 bar.
2. Sound travels ________ times faster in water than in air.
A. 2
B. 4
C. 10
,D. 20
Answer: B
Conceptual Explanation: Because water is much denser than air, sound waves travel
approximately four times faster underwater.
3. If an object is neutrally buoyant in saltwater, what will happen if it is placed in freshwater?
A. It will remain neutrally buoyant
B. It will float
C. It will sink
D. It will explode
Answer: C
Conceptual Explanation: Freshwater is less dense than saltwater. Since the object
displaces the same volume but the weight of the displaced freshwater is less than the
weight of the saltwater, the object will sink.
4. According to Archimedes’ Principle, an object is buoyed up by a force equal to:
A. The weight of the object itself
B. The density of the object
C. The volume of the object
D. The weight of the fluid displaced
, Answer: D
Conceptual Explanation: Archimedes’ Principle states that any object, wholly or partially
immersed in a fluid, is buoyed up by a force equal to the weight of the fluid displaced by the
object.
5. Which gas law explains why a balloon’s volume decreases as it is taken deeper
underwater?
A. Dalton’s Law
B. Henry’s Law
C. Boyle’s Law
D. Charles’s Law
Answer: C
Conceptual Explanation: Boyle’s Law states that if temperature remains constant, the
volume of a gas is inversely proportional to the pressure.
6. Visual reversal is an underwater phenomenon where an object appears:
A. Smaller than it actually is
B. Closer than it actually is
C. Larger than it actually is
D. Further away than it actually is
Answer: D
