PADI Open Water Diver Final Exam 2026-120 QUESTIONS AND ANSWERS
ALREADY GRADED A+. 100% Verified Solutions Updated Per Latest Guidelines
Graded A
PADI Open Water Diver Final Exam Practice Questions
180 Multiple Choice Questions with Answers and Rationales
Section 1: Dive Physics and Principles (Questions 1-40)
1. As you descend in water, the pressure:
A) Decreases
B) Stays the same
C) Increases
D) Fluctuates randomly
Answer: C) Increases
Rationale: Water pressure increases with depth due to the weight of the water
above. For every 10 meters/33 feet of seawater, pressure increases by 1 bar/ata .
2. A depth change of 10 meters/33 feet causes a pressure change of:
A) 0.5 bar/ata
B) 1 bar/ata
,C) 2 bar/ata
D) 3 bar/ata
Answer: B) 1 bar/ata
Rationale: The pressure increases by 1 atmosphere (1 bar/ata) for every 10
meters/33 feet of depth in seawater .
3. If you take 6 liters of air from the surface to 20 meters/66 feet, the volume will
be:
A) 1 liter
B) 2 liters
C) 3 liters
D) 6 liters
Answer: B) 2 liters
Rationale: At 20 meters, the pressure is 3 atmospheres absolute. Using Boyle's
Law (P₁V₁ = P₂V₂), the volume is reduced to one-third: 6L ÷ 3 = 2L .
,4. The density of air at 20 meters/66 feet would be _____ the density at the
surface:
A) 1/3
B) 2 times
C) 3 times
D) 6 times
Answer: C) 3 times
Rationale: As volume decreases under pressure, air density increases
proportionally. At 20 meters, air is 3 times denser than at the surface .
5. A balloon fully inflated and sealed at 10 meters/33 feet would probably _____
during ascent to the surface:
A) Shrink
B) Stay the same size
C) Burst
D) Sink
Answer: C) Burst
, Rationale: As the balloon ascends, the surrounding pressure decreases and the air
inside expands. If the expansion exceeds the balloon's elastic limit, it will burst .
6. A squeeze is caused by:
A) Too much air in an air space
B) A pressure imbalance between the surrounding pressure and an air space
C) Water entering an air space
D) Lack of oxygen
Answer: B) A pressure imbalance between the surrounding pressure and an air
space
Rationale: A squeeze occurs when external pressure exceeds the pressure inside
an air space, causing it to compress and potentially cause injury .
7. Equalization is the process of:
A) Removing water from an air space
B) Adding air to an air space
C) Equalizing water temperature
ALREADY GRADED A+. 100% Verified Solutions Updated Per Latest Guidelines
Graded A
PADI Open Water Diver Final Exam Practice Questions
180 Multiple Choice Questions with Answers and Rationales
Section 1: Dive Physics and Principles (Questions 1-40)
1. As you descend in water, the pressure:
A) Decreases
B) Stays the same
C) Increases
D) Fluctuates randomly
Answer: C) Increases
Rationale: Water pressure increases with depth due to the weight of the water
above. For every 10 meters/33 feet of seawater, pressure increases by 1 bar/ata .
2. A depth change of 10 meters/33 feet causes a pressure change of:
A) 0.5 bar/ata
B) 1 bar/ata
,C) 2 bar/ata
D) 3 bar/ata
Answer: B) 1 bar/ata
Rationale: The pressure increases by 1 atmosphere (1 bar/ata) for every 10
meters/33 feet of depth in seawater .
3. If you take 6 liters of air from the surface to 20 meters/66 feet, the volume will
be:
A) 1 liter
B) 2 liters
C) 3 liters
D) 6 liters
Answer: B) 2 liters
Rationale: At 20 meters, the pressure is 3 atmospheres absolute. Using Boyle's
Law (P₁V₁ = P₂V₂), the volume is reduced to one-third: 6L ÷ 3 = 2L .
,4. The density of air at 20 meters/66 feet would be _____ the density at the
surface:
A) 1/3
B) 2 times
C) 3 times
D) 6 times
Answer: C) 3 times
Rationale: As volume decreases under pressure, air density increases
proportionally. At 20 meters, air is 3 times denser than at the surface .
5. A balloon fully inflated and sealed at 10 meters/33 feet would probably _____
during ascent to the surface:
A) Shrink
B) Stay the same size
C) Burst
D) Sink
Answer: C) Burst
, Rationale: As the balloon ascends, the surrounding pressure decreases and the air
inside expands. If the expansion exceeds the balloon's elastic limit, it will burst .
6. A squeeze is caused by:
A) Too much air in an air space
B) A pressure imbalance between the surrounding pressure and an air space
C) Water entering an air space
D) Lack of oxygen
Answer: B) A pressure imbalance between the surrounding pressure and an air
space
Rationale: A squeeze occurs when external pressure exceeds the pressure inside
an air space, causing it to compress and potentially cause injury .
7. Equalization is the process of:
A) Removing water from an air space
B) Adding air to an air space
C) Equalizing water temperature
