PADI OPEN WATER DIVER FINAL EXAM QUESTIONS
WITH 100% CORRECT ANSWERS
1. As a newly certified PADI Open Water Diver, you are trained to dive
with a buddy to a maximum depth of:
A) 30 metres/100 feet
B) 18 metres/60 feet
C) 12 metres/40 feet
D) 40 metres/130 feet
Correct Answer: B – The PADI Open Water Diver certification limits you
to 18 metres/60 feet, the standard maximum depth for this level of
training.
2. As you descend in water, the surrounding pressure:
A) Decreases
B) Remains constant
C) Increases
D) Fluctuates randomly
Correct Answer: C – Water is denser than air, so pressure increases with
depth due to the weight of the water above.
3. A depth change of 10 metres/33 feet of seawater causes a pressure
change of:
A) 0.5 bar/ata
B) 2 bar/ata
C) 1 bar/ata
D) 1.5 bar/ata
,Correct Answer: C – In seawater, every 10 metres/33 feet adds 1
bar/ata of pressure.
4. If you take 6 litres of air from the surface to 20 metres/66 feet, the
new volume will be:
A) 6 litres
B) 3 litres
C) 2 litres
D) 4 litres
Correct Answer: C – At 20 metres, the pressure is 3 bar/ata; volume = 6
L ÷ 3 = 2 L (Boyle’s Law).
5. A balloon fully inflated and sealed at 10 metres/33 feet would
probably do what during ascent to the surface?
A) Shrink
B) Remain the same size
C) Burst
D) Collapse completely
Correct Answer: C – As pressure decreases during ascent, the air inside
expands; if the balloon cannot stretch further, it will burst.
6. A "squeeze" is caused by:
A) Too much air in the lungs
B) A pressure imbalance between surrounding pressure and an air
space
C) Cold water temperature
D) Rapid ascent
Correct Answer: B – Squeeze occurs when external pressure is greater
than internal pressure in an air space, causing tissue damage.
,7. Equalization is the process of:
A) Removing air from an air space
B) Adding air to an air space
C) Holding your breath
D) Breathing faster
Correct Answer: B – Equalization involves adding air to body air spaces
(e.g., ears, mask) to match external pressure.
8. The most important rule in scuba diving is to:
A) Always dive with a knife
B) Breathe continuously and never hold your breath
C) Dive only in clear water
D) Stay within arm's reach of your buddy
Correct Answer: B – Breath-holding can lead to lung overexpansion
injuries; continuous breathing is critical.
9. During ascent, I feel discomfort in my ears. I should:
A) Continue ascending quickly
B) Stop, descend slightly, and allow trapped air to work its way out
C) Pinch my nose and blow hard
D) Ignore it and surface
Correct Answer: B – Descending slightly reduces the pressure
difference, allowing the Eustachian tubes to open and equalize.
10. My buddy and I descend to 12 metres/40 feet. Compared to 6
metres/20 feet, my air consumption at 12 metres will be:
A) Slower
B) The same
C) Faster
D) Unpredictable
, Correct Answer: C – At greater depth, pressure is higher, so you breathe
more air per breath, using your tank faster.
11. The most efficient way to breathe dense air underwater is to
breathe:
A) Shallow and fast
B) Deeply and slowly
C) Shallow and slow
D) Rapidly and irregularly
Correct Answer: B – Deep, slow breathing maximizes gas exchange and
minimizes dead-air-space ventilation.
12. Buoyancy is defined as:
A) A force that pushes an object down in water
B) A force that pushes an object upward in water
C) The weight of an object
D) The density of an object
Correct Answer: B – Buoyancy is the upward force exerted by water
that opposes the weight of an immersed object.
13. Salt water causes more buoyancy than fresh water because it is:
A) Colder
B) Less dense and weighs less
C) Dense and weighs more
D) Clearer
Correct Answer: C – Salt water is denser, so it displaces more weight for
the same volume, increasing buoyancy.
14. When I descend, my buoyancy tends to _____. When I ascend, it
tends to _____.
A) Increase, decrease
WITH 100% CORRECT ANSWERS
1. As a newly certified PADI Open Water Diver, you are trained to dive
with a buddy to a maximum depth of:
A) 30 metres/100 feet
B) 18 metres/60 feet
C) 12 metres/40 feet
D) 40 metres/130 feet
Correct Answer: B – The PADI Open Water Diver certification limits you
to 18 metres/60 feet, the standard maximum depth for this level of
training.
2. As you descend in water, the surrounding pressure:
A) Decreases
B) Remains constant
C) Increases
D) Fluctuates randomly
Correct Answer: C – Water is denser than air, so pressure increases with
depth due to the weight of the water above.
3. A depth change of 10 metres/33 feet of seawater causes a pressure
change of:
A) 0.5 bar/ata
B) 2 bar/ata
C) 1 bar/ata
D) 1.5 bar/ata
,Correct Answer: C – In seawater, every 10 metres/33 feet adds 1
bar/ata of pressure.
4. If you take 6 litres of air from the surface to 20 metres/66 feet, the
new volume will be:
A) 6 litres
B) 3 litres
C) 2 litres
D) 4 litres
Correct Answer: C – At 20 metres, the pressure is 3 bar/ata; volume = 6
L ÷ 3 = 2 L (Boyle’s Law).
5. A balloon fully inflated and sealed at 10 metres/33 feet would
probably do what during ascent to the surface?
A) Shrink
B) Remain the same size
C) Burst
D) Collapse completely
Correct Answer: C – As pressure decreases during ascent, the air inside
expands; if the balloon cannot stretch further, it will burst.
6. A "squeeze" is caused by:
A) Too much air in the lungs
B) A pressure imbalance between surrounding pressure and an air
space
C) Cold water temperature
D) Rapid ascent
Correct Answer: B – Squeeze occurs when external pressure is greater
than internal pressure in an air space, causing tissue damage.
,7. Equalization is the process of:
A) Removing air from an air space
B) Adding air to an air space
C) Holding your breath
D) Breathing faster
Correct Answer: B – Equalization involves adding air to body air spaces
(e.g., ears, mask) to match external pressure.
8. The most important rule in scuba diving is to:
A) Always dive with a knife
B) Breathe continuously and never hold your breath
C) Dive only in clear water
D) Stay within arm's reach of your buddy
Correct Answer: B – Breath-holding can lead to lung overexpansion
injuries; continuous breathing is critical.
9. During ascent, I feel discomfort in my ears. I should:
A) Continue ascending quickly
B) Stop, descend slightly, and allow trapped air to work its way out
C) Pinch my nose and blow hard
D) Ignore it and surface
Correct Answer: B – Descending slightly reduces the pressure
difference, allowing the Eustachian tubes to open and equalize.
10. My buddy and I descend to 12 metres/40 feet. Compared to 6
metres/20 feet, my air consumption at 12 metres will be:
A) Slower
B) The same
C) Faster
D) Unpredictable
, Correct Answer: C – At greater depth, pressure is higher, so you breathe
more air per breath, using your tank faster.
11. The most efficient way to breathe dense air underwater is to
breathe:
A) Shallow and fast
B) Deeply and slowly
C) Shallow and slow
D) Rapidly and irregularly
Correct Answer: B – Deep, slow breathing maximizes gas exchange and
minimizes dead-air-space ventilation.
12. Buoyancy is defined as:
A) A force that pushes an object down in water
B) A force that pushes an object upward in water
C) The weight of an object
D) The density of an object
Correct Answer: B – Buoyancy is the upward force exerted by water
that opposes the weight of an immersed object.
13. Salt water causes more buoyancy than fresh water because it is:
A) Colder
B) Less dense and weighs less
C) Dense and weighs more
D) Clearer
Correct Answer: C – Salt water is denser, so it displaces more weight for
the same volume, increasing buoyancy.
14. When I descend, my buoyancy tends to _____. When I ascend, it
tends to _____.
A) Increase, decrease
