PADI Open Water Exam Study Guide
with Complete Solutions 100% Correct.
(SCORED A+)
When is an object positively buoyant? - ANSWER-When it displaces a volume of water
weighing more than its own weight.
When is an object negatively buoyant? - ANSWER-When it displaces a volume of water
weighing less than its own weight.
When is an object neutrally buoyant? - ANSWER-When it displaces a volume of water
weighing the same as its own weight.
Why two pieces of equipment do you use to control your buoyancy? - ANSWER-BCD,
Lead weight
What does buoyancy help with when you are underwater? - ANSWER-Controlling
where you are
What does buoyancy help with when you are at the surface? - ANSWER-Floatation,
conserving energy
How does the buoyancy of an object differ in fresh/salt water? - ANSWER-More
buoyant in salt than fresh
When you exhale what happens? - ANSWER-Lung volume decreases so you have less
buoyancy.
When you inhale what happens? - ANSWER-Lung volume increases so you have more
buoyancy.
Why don't you feel air pressure? - ANSWER-Your body is primarily liquid, which is
incompressible and distribute pressure equally throughout your whole body.
Where are some air spaces located in the body? - ANSWER-Ears, sinuses, lungs
Do you always feel the pressure in body air spaces? - ANSWER-Only if the pressure is
different inside and outside the air spaces.
1 bar is what depth? - ANSWER-0m/0ft
, 2 bar is what depth? - ANSWER-33ft/10m
3 bar is what depth? - ANSWER-66ft/20m
4 bar is what depth? - ANSWER-99ft/30m
How is air volume affected when depth is increased? - ANSWER-It decreases
How is air density affected when depth is increased? - ANSWER-It increases
What happens if you take an air volume underwater with you in a flexible container or
inverted jar? - ANSWER-As pressure increases the volume decreases, same air but
smaller space.
How do you maintain air volume as you descend? - ANSWER-Equalize
What is a "squeeze"? - ANSWER-As volume decreases, pressure pushes body tissues
inwards toward air space, causing discomfort. Pressure outside air space is more than
pressure inside air space.
Where can you get a squeeze? - ANSWER-Ears, sinuses, mask, lungs, teeth
How do you equalise air spaces in ears? - ANSWER-Blow and squeeze nose, wiggle
jaw, swallowing
How often should you equalise? - ANSWER-Every metre before discomfort
What do you do if you feel discomfort? - ANSWER-Ascend until discomfort eases,
equalise, continue descent slowly
Why can't you scuba while sick? - ANSWER-Congestion can plug air passages so you
can't equalize
What is mask equalisation? - ANSWER-exhale into mask by nose
What does your nose need to be in the mask? - ANSWER-To equalize
First rule of diving - ANSWER-Always breathe continuously
What happens if you hold your breath during ascent? - ANSWER-Lung over expansion,
forces air into bloodstream and chest cavity, leading to paralysis or death.
What is a reverse block? - ANSWER-When air cannot escape from a air space during
ascent
with Complete Solutions 100% Correct.
(SCORED A+)
When is an object positively buoyant? - ANSWER-When it displaces a volume of water
weighing more than its own weight.
When is an object negatively buoyant? - ANSWER-When it displaces a volume of water
weighing less than its own weight.
When is an object neutrally buoyant? - ANSWER-When it displaces a volume of water
weighing the same as its own weight.
Why two pieces of equipment do you use to control your buoyancy? - ANSWER-BCD,
Lead weight
What does buoyancy help with when you are underwater? - ANSWER-Controlling
where you are
What does buoyancy help with when you are at the surface? - ANSWER-Floatation,
conserving energy
How does the buoyancy of an object differ in fresh/salt water? - ANSWER-More
buoyant in salt than fresh
When you exhale what happens? - ANSWER-Lung volume decreases so you have less
buoyancy.
When you inhale what happens? - ANSWER-Lung volume increases so you have more
buoyancy.
Why don't you feel air pressure? - ANSWER-Your body is primarily liquid, which is
incompressible and distribute pressure equally throughout your whole body.
Where are some air spaces located in the body? - ANSWER-Ears, sinuses, lungs
Do you always feel the pressure in body air spaces? - ANSWER-Only if the pressure is
different inside and outside the air spaces.
1 bar is what depth? - ANSWER-0m/0ft
, 2 bar is what depth? - ANSWER-33ft/10m
3 bar is what depth? - ANSWER-66ft/20m
4 bar is what depth? - ANSWER-99ft/30m
How is air volume affected when depth is increased? - ANSWER-It decreases
How is air density affected when depth is increased? - ANSWER-It increases
What happens if you take an air volume underwater with you in a flexible container or
inverted jar? - ANSWER-As pressure increases the volume decreases, same air but
smaller space.
How do you maintain air volume as you descend? - ANSWER-Equalize
What is a "squeeze"? - ANSWER-As volume decreases, pressure pushes body tissues
inwards toward air space, causing discomfort. Pressure outside air space is more than
pressure inside air space.
Where can you get a squeeze? - ANSWER-Ears, sinuses, mask, lungs, teeth
How do you equalise air spaces in ears? - ANSWER-Blow and squeeze nose, wiggle
jaw, swallowing
How often should you equalise? - ANSWER-Every metre before discomfort
What do you do if you feel discomfort? - ANSWER-Ascend until discomfort eases,
equalise, continue descent slowly
Why can't you scuba while sick? - ANSWER-Congestion can plug air passages so you
can't equalize
What is mask equalisation? - ANSWER-exhale into mask by nose
What does your nose need to be in the mask? - ANSWER-To equalize
First rule of diving - ANSWER-Always breathe continuously
What happens if you hold your breath during ascent? - ANSWER-Lung over expansion,
forces air into bloodstream and chest cavity, leading to paralysis or death.
What is a reverse block? - ANSWER-When air cannot escape from a air space during
ascent
