1
PADI Open Water Diver Final Exam Scuba
Diving Certification Actual Exam 2026/2027
with Detailed Rationales | Complete Exam-
Style Questions | Pass Guaranteed – A+
Graded
TABLE OF CONTENTS
Section 1 | Diving Physics & Physiology | Q1 – Q15
Section 2 | Scuba Equipment | Q16 – Q25
Section 3 | Diving Skills & Safety Procedures | Q26 – Q35
Section 4 | Dive Planning & The Underwater Environment | Q36 – Q43
Section 5 | NGN-Style Case Analysis & Problem Management | Q44 – Q50
Instructions: Choose the single best answer. Pass: 38 in 60 minutes.
══════════════════════════════════════
SECTION 1: DIVING PHYSICS & PHYSIOLOGY Q1 – Q15
══════════════════════════════════════
Question 1 of 50
A diver plans to explore a reef at 20 meters of seawater and needs to calculate their
absolute pressure exposure for dive computer settings.
A. 2 bar/ata
,2
B. 3 bar/ata ✓ CORRECT
C. 4 bar/ata
D. 1 bar/ata
Correct Answer: B
Rationale: Absolute pressure underwater is calculated by adding the 1 bar/ata of
atmospheric pressure at the surface to the hydrostatic pressure, which increases by
1 bar/ata for every 10 meters of depth. A common trap is choosing 2 bar/ata, which
only accounts for the water pressure and forgets the surface atmosphere. Always
remember to add the 1 surface atmosphere to the depth pressure when calculating
absolute pressure.
Question 2 of 50
While practicing deploying a delayed surface marker buoy, a diver fills a small lift
bag with 10 liters of air at the surface and releases it.
A. 40 liters
B. 10 liters
C. 5 liters
D. 2.5 liters ✓ CORRECT
Correct Answer: D
Rationale: According to Boyle's Law, volume and pressure are inversely related,
meaning at 30 meters the absolute pressure is 4 bar/ata and the volume is reduced
to one-quarter of its surface volume. A tempting mistake is selecting 5 liters by
miscalculating the pressure at 30 meters as only 2 bar/ata instead of 4 bar/ata.
When doing volume calculations, always confirm your absolute pressure first by
dividing the depth by 10 and adding 1.
,3
Question 3 of 50
A diver is ascending from a shallow wreck dive and notices their regulator is
slightly stuck in their mouth, prompting them to consider their breathing pattern.
A. Hold their breath to prevent water from entering the regulator
B. Breathe continuously and never hold their breath ✓ CORRECT
C. Take shallow sips of air to conserve their remaining supply
D. Inhale deeply and hold for three seconds before exhaling
Correct Answer: B
Rationale: The most important rule in scuba diving is to never hold your breath
because ascending even a few feet while holding your breath can cause lung
overexpansion injuries as the air inside expands. A dangerous trap is thinking that
holding your breath in a shallow ascent is safe, but the greatest proportional
pressure change occurs in the last 10 meters, making shallow breath-holding
extremely hazardous. If you ever feel the urge to hold your breath, simply hum or
continuously exhale a slow stream of bubbles.
Question 4 of 50
During a descent down a mooring line, a diver begins to feel an uncomfortable
squeezing sensation in their ears.
A. Continue descending while wiggling their jaw aggressively
B. Ascend slightly until the discomfort resolves, then try equalizing again ✓
CORRECT
, 4
C. Hold their nose and blow forcefully to overpower the blockage
D. Tilt their head back and swallow repeatedly while continuing down
Correct Answer: B
Rationale: If a diver feels discomfort in their ears during descent, they must ascend
slightly to reduce the pressure differential and allow the Eustachian tubes to open
for equalization. Forcing a descent or blowing too hard can cause a reverse block
or ruptured eardrum, which is a common mistake for divers eager to reach the
bottom. Never force equalization; if it does not happen easily, ascend a few feet
and try again.
Question 5 of 50
A diver typically breathes 20 liters of air per minute at the surface and wants to
estimate their air consumption at 20 meters.
A. 20 liters per minute
B. 40 liters per minute
C. 60 liters per minute ✓ CORRECT
D. 80 liters per minute
Correct Answer: C
Rationale: Air consumption is proportional to absolute pressure, and at 20 meters
the absolute pressure is 3 bar/ata, meaning the diver breathes three times their
surface rate (20 x 3 = 60 liters per minute). A common error is selecting 40 liters
per minute, which incorrectly uses the depth in meters rather than the absolute
pressure in bar/ata. To quickly estimate your air consumption at depth, multiply
your surface consumption rate by the absolute pressure in bar/ata.
PADI Open Water Diver Final Exam Scuba
Diving Certification Actual Exam 2026/2027
with Detailed Rationales | Complete Exam-
Style Questions | Pass Guaranteed – A+
Graded
TABLE OF CONTENTS
Section 1 | Diving Physics & Physiology | Q1 – Q15
Section 2 | Scuba Equipment | Q16 – Q25
Section 3 | Diving Skills & Safety Procedures | Q26 – Q35
Section 4 | Dive Planning & The Underwater Environment | Q36 – Q43
Section 5 | NGN-Style Case Analysis & Problem Management | Q44 – Q50
Instructions: Choose the single best answer. Pass: 38 in 60 minutes.
══════════════════════════════════════
SECTION 1: DIVING PHYSICS & PHYSIOLOGY Q1 – Q15
══════════════════════════════════════
Question 1 of 50
A diver plans to explore a reef at 20 meters of seawater and needs to calculate their
absolute pressure exposure for dive computer settings.
A. 2 bar/ata
,2
B. 3 bar/ata ✓ CORRECT
C. 4 bar/ata
D. 1 bar/ata
Correct Answer: B
Rationale: Absolute pressure underwater is calculated by adding the 1 bar/ata of
atmospheric pressure at the surface to the hydrostatic pressure, which increases by
1 bar/ata for every 10 meters of depth. A common trap is choosing 2 bar/ata, which
only accounts for the water pressure and forgets the surface atmosphere. Always
remember to add the 1 surface atmosphere to the depth pressure when calculating
absolute pressure.
Question 2 of 50
While practicing deploying a delayed surface marker buoy, a diver fills a small lift
bag with 10 liters of air at the surface and releases it.
A. 40 liters
B. 10 liters
C. 5 liters
D. 2.5 liters ✓ CORRECT
Correct Answer: D
Rationale: According to Boyle's Law, volume and pressure are inversely related,
meaning at 30 meters the absolute pressure is 4 bar/ata and the volume is reduced
to one-quarter of its surface volume. A tempting mistake is selecting 5 liters by
miscalculating the pressure at 30 meters as only 2 bar/ata instead of 4 bar/ata.
When doing volume calculations, always confirm your absolute pressure first by
dividing the depth by 10 and adding 1.
,3
Question 3 of 50
A diver is ascending from a shallow wreck dive and notices their regulator is
slightly stuck in their mouth, prompting them to consider their breathing pattern.
A. Hold their breath to prevent water from entering the regulator
B. Breathe continuously and never hold their breath ✓ CORRECT
C. Take shallow sips of air to conserve their remaining supply
D. Inhale deeply and hold for three seconds before exhaling
Correct Answer: B
Rationale: The most important rule in scuba diving is to never hold your breath
because ascending even a few feet while holding your breath can cause lung
overexpansion injuries as the air inside expands. A dangerous trap is thinking that
holding your breath in a shallow ascent is safe, but the greatest proportional
pressure change occurs in the last 10 meters, making shallow breath-holding
extremely hazardous. If you ever feel the urge to hold your breath, simply hum or
continuously exhale a slow stream of bubbles.
Question 4 of 50
During a descent down a mooring line, a diver begins to feel an uncomfortable
squeezing sensation in their ears.
A. Continue descending while wiggling their jaw aggressively
B. Ascend slightly until the discomfort resolves, then try equalizing again ✓
CORRECT
, 4
C. Hold their nose and blow forcefully to overpower the blockage
D. Tilt their head back and swallow repeatedly while continuing down
Correct Answer: B
Rationale: If a diver feels discomfort in their ears during descent, they must ascend
slightly to reduce the pressure differential and allow the Eustachian tubes to open
for equalization. Forcing a descent or blowing too hard can cause a reverse block
or ruptured eardrum, which is a common mistake for divers eager to reach the
bottom. Never force equalization; if it does not happen easily, ascend a few feet
and try again.
Question 5 of 50
A diver typically breathes 20 liters of air per minute at the surface and wants to
estimate their air consumption at 20 meters.
A. 20 liters per minute
B. 40 liters per minute
C. 60 liters per minute ✓ CORRECT
D. 80 liters per minute
Correct Answer: C
Rationale: Air consumption is proportional to absolute pressure, and at 20 meters
the absolute pressure is 3 bar/ata, meaning the diver breathes three times their
surface rate (20 x 3 = 60 liters per minute). A common error is selecting 40 liters
per minute, which incorrectly uses the depth in meters rather than the absolute
pressure in bar/ata. To quickly estimate your air consumption at depth, multiply
your surface consumption rate by the absolute pressure in bar/ata.
