PADI Open Water Diver Certification Exam
Questions And Correct Answers (Verified
Answers) 2026/2027
SCUBA - CORRECT ANSWER -Self contained underwater breathing
apparatus
What is the pressure change for each 10m/33ft of depth change? - CORRECT
ANSWER -1 bar/1 ata/1 atmosphere
What is the relationship between my depth in water and the pressure? -
CORRECT ANSWER -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? - CORRECT ANSWER -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? - CORRECT ANSWER -Volume will be 1/ata#
Density will be ata#
What 3 major body air spaces does increasing pressure affect as I descend? -
CORRECT ANSWER -Ears, sinuses, mask
,What is a "squeeze"? - CORRECT ANSWER -The discomfort caused by
pressure imbalance pulling tissue into the air space
What is "equalization"? - CORRECT ANSWER -The addition of air to your
air spaces as you descend
How do I equalize as I descend? - CORRECT ANSWER -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? - CORRECT ANSWER -Every meter/few feet,
BEFORE you feel discomfort
What should I do if I can't equalize? - CORRECT ANSWER -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? -
CORRECT ANSWER -Fluid can rupture the eardrum
Bruising around the face can occur
Why does a congestion from a cold or allergy temporarily keep me from
diving? - CORRECT ANSWER -Congestion might block normal air flow,
making equalization difficult or impossible
, Why should I never dive with earplugs? - CORRECT ANSWER -They create
air spaces that you can't equalize
What other body air spaces are affected by increasing pressure? How do I
equalize them? - CORRECT ANSWER -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? - CORRECT ANSWER -
Breathe continuously and never hold your breath
What can happen if I don't follow the most important rule in scuba diving? -
CORRECT ANSWER -Your lungs will over expand and rupture
What is a "reverse block"? - CORRECT ANSWER -When expanding air
becomes trapped in your body air spaces as you ascend
What should I do if I feel discomfort in my ears, sinuses, stomach, intestines,
or teeth while ascending? - CORRECT ANSWER -Stop your ascent and
descend a meter/few feet to reduce discomfort and give trapped air time to
work its way out
How does depth affect how long my air supply lasts? - CORRECT ANSWER
-The deeper you are, the more dense air you breathe, and the faster you use
the air in your cylinder. Compared to the surface, air supply lasts 1/#ata as
long along with other factors
Questions And Correct Answers (Verified
Answers) 2026/2027
SCUBA - CORRECT ANSWER -Self contained underwater breathing
apparatus
What is the pressure change for each 10m/33ft of depth change? - CORRECT
ANSWER -1 bar/1 ata/1 atmosphere
What is the relationship between my depth in water and the pressure? -
CORRECT ANSWER -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? - CORRECT ANSWER -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? - CORRECT ANSWER -Volume will be 1/ata#
Density will be ata#
What 3 major body air spaces does increasing pressure affect as I descend? -
CORRECT ANSWER -Ears, sinuses, mask
,What is a "squeeze"? - CORRECT ANSWER -The discomfort caused by
pressure imbalance pulling tissue into the air space
What is "equalization"? - CORRECT ANSWER -The addition of air to your
air spaces as you descend
How do I equalize as I descend? - CORRECT ANSWER -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? - CORRECT ANSWER -Every meter/few feet,
BEFORE you feel discomfort
What should I do if I can't equalize? - CORRECT ANSWER -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? -
CORRECT ANSWER -Fluid can rupture the eardrum
Bruising around the face can occur
Why does a congestion from a cold or allergy temporarily keep me from
diving? - CORRECT ANSWER -Congestion might block normal air flow,
making equalization difficult or impossible
, Why should I never dive with earplugs? - CORRECT ANSWER -They create
air spaces that you can't equalize
What other body air spaces are affected by increasing pressure? How do I
equalize them? - CORRECT ANSWER -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? - CORRECT ANSWER -
Breathe continuously and never hold your breath
What can happen if I don't follow the most important rule in scuba diving? -
CORRECT ANSWER -Your lungs will over expand and rupture
What is a "reverse block"? - CORRECT ANSWER -When expanding air
becomes trapped in your body air spaces as you ascend
What should I do if I feel discomfort in my ears, sinuses, stomach, intestines,
or teeth while ascending? - CORRECT ANSWER -Stop your ascent and
descend a meter/few feet to reduce discomfort and give trapped air time to
work its way out
How does depth affect how long my air supply lasts? - CORRECT ANSWER
-The deeper you are, the more dense air you breathe, and the faster you use
the air in your cylinder. Compared to the surface, air supply lasts 1/#ata as
long along with other factors
