1
PADI Open Water Final Exam A Actual Exam
2026/2027 – Complete Exam-Style Questions with
Detailed Rationales | 100% Verified | Pass
Guaranteed – A+ Graded
[SECTION 1: DIVING PHYSICS & PHYSIOLOGY — Questions 1-12]
Q1: If a balloon is filled with air at the surface (1 bar/atm) and taken down to a depth of 33 feet
(10 meters) in saltwater, what happens to the volume of the air inside the balloon?
A. The volume stays the same because pressure does not affect air.
B. The volume doubles because the pressure decreases.
C. The volume is reduced to one-half of its original volume because the pressure doubles.
[CORRECT]
D. The volume is reduced to one-third of its original volume because the pressure triples.
Correct Answer: C
Rationale: According to Boyle's Law, pressure and volume are inversely proportional. At 33 feet
of saltwater, the ambient pressure is 2 ATA (1 atmosphere of air + 1 atmosphere of water). Since
the pressure has doubled (1 ATA to 2 ATA), the volume of the gas must be reduced by half.
Options A and B contradict Boyle's Law, and option D incorrectly calculates the pressure change,
which would require a depth of 66 feet to reach 3 ATA.
Q2: What is the primary reason you should never hold your breath while scuba diving?
A. It causes your lungs to overexpand with air, potentially leading to lung over-expansion injury.
B. It increases your heart rate and causes you to consume air faster.
C. It prevents you from equalizing your ears effectively.
D. It causes nitrogen to build up in your bloodstream faster than normal.
Correct Answer: A
,2
Rationale: As you ascend, the air in your lungs expands due to decreasing pressure (Boyle's
Law). If you hold your breath, the expanding air can rupture lung tissue (lung over-expansion
injury), forcing air into the bloodstream or chest cavity, which can be fatal. While B is true
regarding consumption and C is related to comfort, the critical safety rule is preventing injury
from expanding air. Option D relates to nitrogen absorption, which is time and depth dependent,
not breath-holding.
Q3: A diver experiences a feeling of discomfort and pain in their ears during a descent. What is
the most likely cause, and what should they do?
A. The discomfort is caused by water pressure; they should continue descending to "break
through" the pain.
B. The discomfort is caused by mask squeeze; they should blow air into their mask.
C. The discomfort is caused by failure to equalize the air spaces in the ears; they should stop
descending, ascend slightly, and attempt to equalize using the Valsalva maneuver. [CORRECT]
D. The discomfort is caused by nitrogen narcosis; they should immediately abort the dive and
surface.
Correct Answer: C
Rationale: As you descend, water pressure increases, pushing against the eardrum. Equalizing
adds air to the middle ear via the Eustachian tubes to balance this pressure. Continuing to
descend (A) can rupture the eardrum. Mask squeeze (B) affects the face/mask seal, not the inner
ear directly. Nitrogen narcosis (D) generally occurs at deeper depths and does not present as ear
pain. The correct procedure is to relieve pressure before continuing.
Q4: Regarding heat loss in water, why does a diver generally lose body heat faster than in air of
the same temperature?
A. Water is less dense than air, allowing heat to escape more quickly.
B. Water absorbs heat from the body approximately 20 times faster than air due to its higher
thermal conductivity.
C. Divers always wear wetsuits that trap cold water against the skin.
D. Water pressure forces body heat out through the skin pores.
, 3
Correct Answer: B
Rationale: Water has a much higher thermal conductivity than air, meaning it draws heat away
from the body much faster. Even in water that feels warm, prolonged exposure can lead to
hypothermia. Option A is incorrect as water is denser. Option C describes the function of a
wetsuit (which warms the water), not the cause of heat loss. Option D is a physiological
misconception; heat loss is via conduction/convection, not pressure squeezing heat out.
Q5: If a diver displaces 50 pounds of water but weighs 60 pounds with their gear, what is the
diver's buoyancy status?
A. The diver is positively buoyant and will float.
B. The diver is negatively buoyant and will sink. [CORRECT]
C. The diver is neutrally buoyant and will hover.
D. The diver is positively buoyant and must add weight to their BCD.
Correct Answer: B
Rationale: Archimedes' principle states that an object is buoyed up by a force equal to the weight
of the fluid it displaces. If the diver displaces 50 pounds of water (upward force) but weighs 60
pounds (downward force), the downward force is greater. Therefore, the diver is negatively
buoyant. To achieve neutral buoyancy, the diver would need to displace more water (add
volume/inflate BCD) or reduce weight.
Q6: How does vision underwater differ from vision in air, and how is this typically corrected?
A. Objects appear smaller and farther away; corrected by wearing a hood.
B. Objects appear larger and closer; corrected by wearing a face mask with a flat air interface.
C. Objects appear in normal proportion but colors are lost immediately; corrected by using a dive
light.
D. Objects appear distorted and blurry; corrected only by wearing contact lenses.
Correct Answer: B
Rationale: Light travels at different speeds through water versus the air space in a mask. This
refraction causes objects to appear about 33% larger and 25% closer underwater. The flat glass of
PADI Open Water Final Exam A Actual Exam
2026/2027 – Complete Exam-Style Questions with
Detailed Rationales | 100% Verified | Pass
Guaranteed – A+ Graded
[SECTION 1: DIVING PHYSICS & PHYSIOLOGY — Questions 1-12]
Q1: If a balloon is filled with air at the surface (1 bar/atm) and taken down to a depth of 33 feet
(10 meters) in saltwater, what happens to the volume of the air inside the balloon?
A. The volume stays the same because pressure does not affect air.
B. The volume doubles because the pressure decreases.
C. The volume is reduced to one-half of its original volume because the pressure doubles.
[CORRECT]
D. The volume is reduced to one-third of its original volume because the pressure triples.
Correct Answer: C
Rationale: According to Boyle's Law, pressure and volume are inversely proportional. At 33 feet
of saltwater, the ambient pressure is 2 ATA (1 atmosphere of air + 1 atmosphere of water). Since
the pressure has doubled (1 ATA to 2 ATA), the volume of the gas must be reduced by half.
Options A and B contradict Boyle's Law, and option D incorrectly calculates the pressure change,
which would require a depth of 66 feet to reach 3 ATA.
Q2: What is the primary reason you should never hold your breath while scuba diving?
A. It causes your lungs to overexpand with air, potentially leading to lung over-expansion injury.
B. It increases your heart rate and causes you to consume air faster.
C. It prevents you from equalizing your ears effectively.
D. It causes nitrogen to build up in your bloodstream faster than normal.
Correct Answer: A
,2
Rationale: As you ascend, the air in your lungs expands due to decreasing pressure (Boyle's
Law). If you hold your breath, the expanding air can rupture lung tissue (lung over-expansion
injury), forcing air into the bloodstream or chest cavity, which can be fatal. While B is true
regarding consumption and C is related to comfort, the critical safety rule is preventing injury
from expanding air. Option D relates to nitrogen absorption, which is time and depth dependent,
not breath-holding.
Q3: A diver experiences a feeling of discomfort and pain in their ears during a descent. What is
the most likely cause, and what should they do?
A. The discomfort is caused by water pressure; they should continue descending to "break
through" the pain.
B. The discomfort is caused by mask squeeze; they should blow air into their mask.
C. The discomfort is caused by failure to equalize the air spaces in the ears; they should stop
descending, ascend slightly, and attempt to equalize using the Valsalva maneuver. [CORRECT]
D. The discomfort is caused by nitrogen narcosis; they should immediately abort the dive and
surface.
Correct Answer: C
Rationale: As you descend, water pressure increases, pushing against the eardrum. Equalizing
adds air to the middle ear via the Eustachian tubes to balance this pressure. Continuing to
descend (A) can rupture the eardrum. Mask squeeze (B) affects the face/mask seal, not the inner
ear directly. Nitrogen narcosis (D) generally occurs at deeper depths and does not present as ear
pain. The correct procedure is to relieve pressure before continuing.
Q4: Regarding heat loss in water, why does a diver generally lose body heat faster than in air of
the same temperature?
A. Water is less dense than air, allowing heat to escape more quickly.
B. Water absorbs heat from the body approximately 20 times faster than air due to its higher
thermal conductivity.
C. Divers always wear wetsuits that trap cold water against the skin.
D. Water pressure forces body heat out through the skin pores.
, 3
Correct Answer: B
Rationale: Water has a much higher thermal conductivity than air, meaning it draws heat away
from the body much faster. Even in water that feels warm, prolonged exposure can lead to
hypothermia. Option A is incorrect as water is denser. Option C describes the function of a
wetsuit (which warms the water), not the cause of heat loss. Option D is a physiological
misconception; heat loss is via conduction/convection, not pressure squeezing heat out.
Q5: If a diver displaces 50 pounds of water but weighs 60 pounds with their gear, what is the
diver's buoyancy status?
A. The diver is positively buoyant and will float.
B. The diver is negatively buoyant and will sink. [CORRECT]
C. The diver is neutrally buoyant and will hover.
D. The diver is positively buoyant and must add weight to their BCD.
Correct Answer: B
Rationale: Archimedes' principle states that an object is buoyed up by a force equal to the weight
of the fluid it displaces. If the diver displaces 50 pounds of water (upward force) but weighs 60
pounds (downward force), the downward force is greater. Therefore, the diver is negatively
buoyant. To achieve neutral buoyancy, the diver would need to displace more water (add
volume/inflate BCD) or reduce weight.
Q6: How does vision underwater differ from vision in air, and how is this typically corrected?
A. Objects appear smaller and farther away; corrected by wearing a hood.
B. Objects appear larger and closer; corrected by wearing a face mask with a flat air interface.
C. Objects appear in normal proportion but colors are lost immediately; corrected by using a dive
light.
D. Objects appear distorted and blurry; corrected only by wearing contact lenses.
Correct Answer: B
Rationale: Light travels at different speeds through water versus the air space in a mask. This
refraction causes objects to appear about 33% larger and 25% closer underwater. The flat glass of
