PADI Open Water Diver Final Exam – Comprehensive Study Guide, Key Concepts & Practice
Questions Review
As you descend in water the pressure - ✔✔increases
A depth change of 10 meters/33 feet causes a pressure change of - ✔✔2 bar/Ata
if you take 6 liters of air from the surface to 20 metres/66 feet, the volume will be - ✔✔2 liters
The density of the air at 20 meters/66 feet would be _______ the density at the surface of -
✔✔three times
A balloon fully inflated and sealed at 10 meters/33 feet, would probably ________ during
ascent to the surface. - ✔✔expand/burst
As I descend, increasing pressure affects my _________ - ✔✔mask, ears, sinuses
A squeeze is caused by - ✔✔a pressure imbalance between the surrounding pressure and an
air space
Equalization is the process of - ✔✔adding air to an air space
I should equalize - ✔✔before i feel pain or discomfort
I'm descending and discovering I can't equalize. The first thing I would do is - ✔✔stop my
descent and signal my buddy/the instructor
,On a day I plan to go diving, I wake up with my sinuses blocked due to a cold or allergy. I should
- ✔✔cancel the dive until I'm well
When scuba diving, normal breathing keeps your lungs equalized to the surrounding pressure
(T/F) - ✔✔True
The most important rule in scuba diving is to - ✔✔breathe continuously and never hold your
breath
Failure to follow the most important rule in scuba diving can cause severe lung overexpansion
injuries, which can result in paralysis or death (T/F) - ✔✔true
During ascent I feel discomfort in my ears. I should - ✔✔stop, descend slightly and allow
trapped air to work its way out
Depth 0m/0ft what is the pressure, volume and density - ✔✔1 bar/ata, 1 volume, 1x density
Depth 10m/33ft what is the pressure, volume and density - ✔✔2 bar/ata, 1/2 volume, 2x
density
Depth 20m/66ft what is the pressure, volume and density - ✔✔3 bar/ata, 1/3 volume, 3x
density
Depth 30m/99ft what is the pressure, volume and density - ✔✔4 bar/ata, 1/4 volume, 4x
density
As I descend, I need to equalize air spaces. Which of the following are accepted ways of
equalizing my ears?
a. Block my nose and attempt to gently blow through it.
, b. Swallow and wiggle the jaw from side to side
c. Block my nose and blow forcefully for an extended period - ✔✔Block my nose and attempt
to gently blow through it + swallow and wiggle the jaw from side to side
I should equalize
a. early and often, before I feel discomfort
b. when I begin to feel discomfort
c. only if I experience pain - ✔✔early and often, before I feel discomfort
I should not dive with a cold, nor use medications to dive with a cold. True or False - ✔✔True
Failure to follow the most important rule in scuba diving can cause serious lung overexpansion
(lung rupture) injuries, which in turn can cause paralysis and death. True or False - ✔✔True
During a descent, I try to equalize but discover I'm having trouble doing so. Which of the
following is correct?
a. Slow my descent, signal my buddy to slow down and equalize more forcefully
b. Stop my descent, signal my buddy to slow down and try again
c. Continue my descent while equalizing repeatedly
d. Signal my buddy, ascend to the surface and start my descent over the - ✔✔Stop my descent,
signal my buddy to slow down and try again
My buddy and I are planning a dive to 18m/60ft. We would expect our air supply to last
_______ at 10m/33ft, all else being the same.
a. longer than
b. shorter than
c. the same as - ✔✔shorter than
Questions Review
As you descend in water the pressure - ✔✔increases
A depth change of 10 meters/33 feet causes a pressure change of - ✔✔2 bar/Ata
if you take 6 liters of air from the surface to 20 metres/66 feet, the volume will be - ✔✔2 liters
The density of the air at 20 meters/66 feet would be _______ the density at the surface of -
✔✔three times
A balloon fully inflated and sealed at 10 meters/33 feet, would probably ________ during
ascent to the surface. - ✔✔expand/burst
As I descend, increasing pressure affects my _________ - ✔✔mask, ears, sinuses
A squeeze is caused by - ✔✔a pressure imbalance between the surrounding pressure and an
air space
Equalization is the process of - ✔✔adding air to an air space
I should equalize - ✔✔before i feel pain or discomfort
I'm descending and discovering I can't equalize. The first thing I would do is - ✔✔stop my
descent and signal my buddy/the instructor
,On a day I plan to go diving, I wake up with my sinuses blocked due to a cold or allergy. I should
- ✔✔cancel the dive until I'm well
When scuba diving, normal breathing keeps your lungs equalized to the surrounding pressure
(T/F) - ✔✔True
The most important rule in scuba diving is to - ✔✔breathe continuously and never hold your
breath
Failure to follow the most important rule in scuba diving can cause severe lung overexpansion
injuries, which can result in paralysis or death (T/F) - ✔✔true
During ascent I feel discomfort in my ears. I should - ✔✔stop, descend slightly and allow
trapped air to work its way out
Depth 0m/0ft what is the pressure, volume and density - ✔✔1 bar/ata, 1 volume, 1x density
Depth 10m/33ft what is the pressure, volume and density - ✔✔2 bar/ata, 1/2 volume, 2x
density
Depth 20m/66ft what is the pressure, volume and density - ✔✔3 bar/ata, 1/3 volume, 3x
density
Depth 30m/99ft what is the pressure, volume and density - ✔✔4 bar/ata, 1/4 volume, 4x
density
As I descend, I need to equalize air spaces. Which of the following are accepted ways of
equalizing my ears?
a. Block my nose and attempt to gently blow through it.
, b. Swallow and wiggle the jaw from side to side
c. Block my nose and blow forcefully for an extended period - ✔✔Block my nose and attempt
to gently blow through it + swallow and wiggle the jaw from side to side
I should equalize
a. early and often, before I feel discomfort
b. when I begin to feel discomfort
c. only if I experience pain - ✔✔early and often, before I feel discomfort
I should not dive with a cold, nor use medications to dive with a cold. True or False - ✔✔True
Failure to follow the most important rule in scuba diving can cause serious lung overexpansion
(lung rupture) injuries, which in turn can cause paralysis and death. True or False - ✔✔True
During a descent, I try to equalize but discover I'm having trouble doing so. Which of the
following is correct?
a. Slow my descent, signal my buddy to slow down and equalize more forcefully
b. Stop my descent, signal my buddy to slow down and try again
c. Continue my descent while equalizing repeatedly
d. Signal my buddy, ascend to the surface and start my descent over the - ✔✔Stop my descent,
signal my buddy to slow down and try again
My buddy and I are planning a dive to 18m/60ft. We would expect our air supply to last
_______ at 10m/33ft, all else being the same.
a. longer than
b. shorter than
c. the same as - ✔✔shorter than
