PADI OPEN WATER EXAM QUESTIONS WITH COMPLETE
SOLUTION
SCUBA
Self contained underwater breathing apparatus
What is the pressure change for each 10m/33ft of depth change?
1 bar/1 ata/1 atmosphere
What is the relationship between my depth in water and the pressure?
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?
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?
Volume will be 1/ata#
Density will be ata#
What 3 major body air spaces does increasing pressure affect as I
descend?
Ears, sinuses, mask
What is a "squeeze"?
The discomfort caused by pressure imbalance pulling tissue into the air
space
What is "equalization"?
The addition of air to your air spaces as you descend
How do I equalize as I descend?
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?
Every meter/few feet, BEFORE you feel discomfort
What should I do if I can't equalize?
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?
, 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?
Congestion might block normal air flow, making equalization difficult or
impossible
Why should I never dive with earplugs?
They create air spaces that you can't equalize
What other body air spaces are affected by increasing pressure? How
do I equalize them?
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?
Breathe continuously and never hold your breath
What can happen if I don't follow the most important rule in scuba
diving?
Your lungs will over expand and rupture
What is a "reverse block"?
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?
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?
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?
Take slow, deep breaths
How do I breathe to reduce anxiety when under stress?
Do NOT breathe faster - keep breathing slowly
What are my 4 breathing rules as a scuba diver?
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?
SOLUTION
SCUBA
Self contained underwater breathing apparatus
What is the pressure change for each 10m/33ft of depth change?
1 bar/1 ata/1 atmosphere
What is the relationship between my depth in water and the pressure?
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?
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?
Volume will be 1/ata#
Density will be ata#
What 3 major body air spaces does increasing pressure affect as I
descend?
Ears, sinuses, mask
What is a "squeeze"?
The discomfort caused by pressure imbalance pulling tissue into the air
space
What is "equalization"?
The addition of air to your air spaces as you descend
How do I equalize as I descend?
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?
Every meter/few feet, BEFORE you feel discomfort
What should I do if I can't equalize?
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?
, 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?
Congestion might block normal air flow, making equalization difficult or
impossible
Why should I never dive with earplugs?
They create air spaces that you can't equalize
What other body air spaces are affected by increasing pressure? How
do I equalize them?
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?
Breathe continuously and never hold your breath
What can happen if I don't follow the most important rule in scuba
diving?
Your lungs will over expand and rupture
What is a "reverse block"?
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?
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?
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?
Take slow, deep breaths
How do I breathe to reduce anxiety when under stress?
Do NOT breathe faster - keep breathing slowly
What are my 4 breathing rules as a scuba diver?
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?
