PADI Open Water Diver Certification EXAM (2025/2026)
QUESTIONS AND (elaborated) ANSWERS WITH COMPLETE
SOLUTIONS
SCUBA - (ANSWERS)Self contained underwater breathing apparatus
What is the pressure change for each 10m/33ft of depth change? -
(ANSWERS)1 bar/1 ata/1 atmosphere
What is the relationship between my depth in water and the pressure? -
(ANSWERS)The deeper you go in water, the more the pressure increases
Pressure is expressed as the weight of air
What is the relationship between pressure, and the volume and the density
of air? - (ANSWERS)As pressure increases, the gas volume decreases and
the gas density increases
If I take a volume of air from one depth to another depth, how much will the
volume and density change? - (ANSWERS)Volume will be 1/ata#
Density will be ata#
What 3 major body air spaces does increasing pressure affect as I descend?
- (ANSWERS)Ears, sinuses, mask
,PADI Open Water Diver Certification EXAM (2025/2026)
QUESTIONS AND (elaborated) ANSWERS WITH COMPLETE
SOLUTIONS
What is a "squeeze"? - (ANSWERS)The discomfort caused by pressure
imbalance pulling tissue into the air space
What is "equalization"? - (ANSWERS)The addition of air to your air spaces
as you descend
How do I equalize as I descend? - (ANSWERS)For ears and sinuses, pinch
your nose and blow gently, or wiggle your jaw and swallow
For mask, blow into it with nose
How often should I equalize? - (ANSWERS)Every meter/few feet,
BEFORE you feel discomfort
What should I do if I can't equalize? - (ANSWERS)Stop your descent,
signal problem and point to your ear, ascend a bit, and try again
What can happen if I don't or can't equalize gently and keep descending? -
(ANSWERS)Fluid can rupture the eardrum
Bruising around the face can occur
, PADI Open Water Diver Certification EXAM (2025/2026)
QUESTIONS AND (elaborated) ANSWERS WITH COMPLETE
SOLUTIONS
Why does a congestion from a cold or allergy temporarily keep me from
diving? - (ANSWERS)Congestion might block normal air flow, making
equalization difficult or impossible
Why should I never dive with earplugs? - (ANSWERS)They create air
spaces that you can't equalize
What other body air spaces are affected by increasing pressure? How do I
equalize them? - (ANSWERS)In filled teeth - go to a dentist
In a dry suit - learn from an instructor
Lungs - breathe normally and continuously
What is the most important rule in scuba diving? - (ANSWERS)Breathe
continuously and never hold your breath
What can happen if I don't follow the most important rule in scuba diving? -
(ANSWERS)Your lungs will over expand and rupture
What is a "reverse block"? - (ANSWERS)When expanding air becomes
trapped in your body air spaces as you ascend
QUESTIONS AND (elaborated) ANSWERS WITH COMPLETE
SOLUTIONS
SCUBA - (ANSWERS)Self contained underwater breathing apparatus
What is the pressure change for each 10m/33ft of depth change? -
(ANSWERS)1 bar/1 ata/1 atmosphere
What is the relationship between my depth in water and the pressure? -
(ANSWERS)The deeper you go in water, the more the pressure increases
Pressure is expressed as the weight of air
What is the relationship between pressure, and the volume and the density
of air? - (ANSWERS)As pressure increases, the gas volume decreases and
the gas density increases
If I take a volume of air from one depth to another depth, how much will the
volume and density change? - (ANSWERS)Volume will be 1/ata#
Density will be ata#
What 3 major body air spaces does increasing pressure affect as I descend?
- (ANSWERS)Ears, sinuses, mask
,PADI Open Water Diver Certification EXAM (2025/2026)
QUESTIONS AND (elaborated) ANSWERS WITH COMPLETE
SOLUTIONS
What is a "squeeze"? - (ANSWERS)The discomfort caused by pressure
imbalance pulling tissue into the air space
What is "equalization"? - (ANSWERS)The addition of air to your air spaces
as you descend
How do I equalize as I descend? - (ANSWERS)For ears and sinuses, pinch
your nose and blow gently, or wiggle your jaw and swallow
For mask, blow into it with nose
How often should I equalize? - (ANSWERS)Every meter/few feet,
BEFORE you feel discomfort
What should I do if I can't equalize? - (ANSWERS)Stop your descent,
signal problem and point to your ear, ascend a bit, and try again
What can happen if I don't or can't equalize gently and keep descending? -
(ANSWERS)Fluid can rupture the eardrum
Bruising around the face can occur
, PADI Open Water Diver Certification EXAM (2025/2026)
QUESTIONS AND (elaborated) ANSWERS WITH COMPLETE
SOLUTIONS
Why does a congestion from a cold or allergy temporarily keep me from
diving? - (ANSWERS)Congestion might block normal air flow, making
equalization difficult or impossible
Why should I never dive with earplugs? - (ANSWERS)They create air
spaces that you can't equalize
What other body air spaces are affected by increasing pressure? How do I
equalize them? - (ANSWERS)In filled teeth - go to a dentist
In a dry suit - learn from an instructor
Lungs - breathe normally and continuously
What is the most important rule in scuba diving? - (ANSWERS)Breathe
continuously and never hold your breath
What can happen if I don't follow the most important rule in scuba diving? -
(ANSWERS)Your lungs will over expand and rupture
What is a "reverse block"? - (ANSWERS)When expanding air becomes
trapped in your body air spaces as you ascend
