©EVERLY 2025 ALL RIGHTS RESERVED
PADI Open Water Diver Certification. Exam
Questions And Answers 100% Pass
SCUBA - ANS Self contained underwater breathing apparatus
What is the pressure change for each 10m/33ft of depth change? - ANS 1 bar/1 ata/1
atmosphere
What is the relationship between my depth in water and the pressure? - ANS 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? - ANS 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? - ANS Volume will be 1/ata#
Density will be ata#
What 3 major body air spaces does increasing pressure affect as I descend? - ANS Ears,
sinuses, mask
What is a "squeeze"? - ANS The discomfort caused by pressure imbalance pulling tissue into
the air space
, ©EVERLY 2025 ALL RIGHTS RESERVED
What is "equalization"? - ANS The addition of air to your air spaces as you descend
How do I equalize as I descend? - ANS 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? - ANS Every meter/few feet, BEFORE you feel discomfort
What should I do if I can't equalize? - ANS 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? - ANS 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? -
ANS Congestion might block normal air flow, making equalization difficult or impossible
Why should I never dive with earplugs? - ANS They create air spaces that you can't equalize
What other body air spaces are affected by increasing pressure? How do I equalize them? -
ANS 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? - ANS Breathe continuously and never hold
your breath
, ©EVERLY 2025 ALL RIGHTS RESERVED
What can happen if I don't follow the most important rule in scuba diving? - ANS Your lungs
will over expand and rupture
What is a "reverse block"? - ANS 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? - ANS 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? - ANS 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
What's the most efficient way to breathe dense air underwater? - ANS Take slow, deep
breaths
How do I breathe to reduce anxiety when under stress? - ANS Do NOT breathe faster - keep
breathing slowly
What are my 4 breathing rules as a scuba diver? - ANS 1. Breathe continuously and never
hold your breath
2. Breathe slowly and deeply
3. Don't allow yourself to get winded or out of breath
4. If faced with a problem, stop, and reduce anxiety by breathing slowly and deeply
What is buoyancy? - ANS An upward force acting on an object in the water, canceling the
pull of gravity
PADI Open Water Diver Certification. Exam
Questions And Answers 100% Pass
SCUBA - ANS Self contained underwater breathing apparatus
What is the pressure change for each 10m/33ft of depth change? - ANS 1 bar/1 ata/1
atmosphere
What is the relationship between my depth in water and the pressure? - ANS 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? - ANS 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? - ANS Volume will be 1/ata#
Density will be ata#
What 3 major body air spaces does increasing pressure affect as I descend? - ANS Ears,
sinuses, mask
What is a "squeeze"? - ANS The discomfort caused by pressure imbalance pulling tissue into
the air space
, ©EVERLY 2025 ALL RIGHTS RESERVED
What is "equalization"? - ANS The addition of air to your air spaces as you descend
How do I equalize as I descend? - ANS 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? - ANS Every meter/few feet, BEFORE you feel discomfort
What should I do if I can't equalize? - ANS 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? - ANS 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? -
ANS Congestion might block normal air flow, making equalization difficult or impossible
Why should I never dive with earplugs? - ANS They create air spaces that you can't equalize
What other body air spaces are affected by increasing pressure? How do I equalize them? -
ANS 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? - ANS Breathe continuously and never hold
your breath
, ©EVERLY 2025 ALL RIGHTS RESERVED
What can happen if I don't follow the most important rule in scuba diving? - ANS Your lungs
will over expand and rupture
What is a "reverse block"? - ANS 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? - ANS 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? - ANS 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
What's the most efficient way to breathe dense air underwater? - ANS Take slow, deep
breaths
How do I breathe to reduce anxiety when under stress? - ANS Do NOT breathe faster - keep
breathing slowly
What are my 4 breathing rules as a scuba diver? - ANS 1. Breathe continuously and never
hold your breath
2. Breathe slowly and deeply
3. Don't allow yourself to get winded or out of breath
4. If faced with a problem, stop, and reduce anxiety by breathing slowly and deeply
What is buoyancy? - ANS An upward force acting on an object in the water, canceling the
pull of gravity
