PADI Open Water Diver
As I descend, increasing pressure affects my (choose all that apply):
mask, ears and sinuses
My buddy is rinsing a BCD and partially fills the bladder with water. Is this consistent with recommended BCD care?
yes
When setting up and wearing a kit, the alternate air source ________
secures in the triangle formed by my hips and chin
During ascent I feel discomfort in my ears. I should ________
stop, descend slightly and allow trapped air to work its way out
What are the breathing rules I must follow as a diver?
- Breathe continuously and never, ever, hold my breath - Breathe slowly and deeply - Do not allow myself to get winded or out-of-breath - If faced with a problem, stop, then maintain or restore slow, deep breathing
A depth of 10 metres/33 feet causes a pressure change of ________.
1 bar/ata
Identify the four systems that make up a scuba kit.
Cylinder, BCD, Regulator, Weight System
To prepare adjustable fins, I should adjust the straps wearing my wet suit boots. a. True b. False
a. True
My BCD should fit ________
snugly but not restrict breathing when fully inflated
As a newly certified PADI Open Water Diver, I will be trained to dive with a buddy as deep as ________.
18 metres/60 feet
If you take 6 liters of air from the surface to 20 metres/66 feet, the volume will be ________.
2 litres
To control my buoyancy, normally I will use my weight system and my ________
BCD
Regulator
Delivers breathing air at the surrounding pressure when you inhale and directs exhaled air into the water
Cylinder
Hold the high-pressure breathing air supplied by your regulator during the dive.
Weight System
Holds lead weight to counteract the positive buoyancy of your body and some of your equipment, with a mechanism for dropping some or all the weight in an emergency.
BCD (Buoyancy Control Device)
Holds your kit together and allows you to adjust buoyancy throughout the dive.
Buoyancy Capacity
Most BCDs cover a wide range of diving circumstances. Your BCD should have ample buoyancy to easily float you and all your equipment at the surface. You sometimes hear the amount of buoyancy called "lift" capacity.
Cylinder band and harness/jacket
The bladder integrates with an adjustable harness that holds the cylinder on your back. The bladder may be entirely behind you, or wrap partially around your waist and/or over your shoulders. With some systems, you can interchange harnesses and bladders to accommodate sizing and preferences.
LPI (low-pressure inflator) mechanism
Usually at the end of a large-diameter hose, the LPI inflates the bladder with air from your cylinder, via the regulator, when you press a button. Another button allows you to deflate the bladder, or inflate it orally.
A squeeze is caused by ________
a pressure imbalance between the surround pressure and an air space
Shoulder quick release
a quick-release buckle on one or both shoulders makes it easier to get out of your kit
Because water is denser than air, it takes more effort to move through water. a. True b. False
a. True
Buoyancy is a force that pushes an object in water upward. a. True b. False
a. True
Certain medical conditions can be hazardous while diving, so it is important to answer all questions on the Medical Statement honestly and completely. a. True b. False
a. True
Failure to complete assigned independent study can create significant delays, and my instructor may have to cancel and reschedule sessions until I complete the assignment. a. True b. False
a. True
Failure to follow the most important rule in scuba diving can cause severe lung overexpansion injuries, which can result in paralysis or death. a. True b. False
a. True
Fins provide a large surface area so my legs can push against the water effectively. a. True b. False
a. True
Getting the service my gear needs may be a consideration when choosing equipment. a. True b. False
a. True
I chill faster in water than in air of the same temperature because water absorbs more heat than air does. a. True b. False
a. True
I equalize gently because an extended, forceful equalization can cause permanent damage to my ears and hearing. a. True b. False
a. True
I must be able to quickly release enough weight to float reliably in an emergency, but not necessarily all my weight. a. True b. False
a. True
If I'm tired, have labored breathing and feel air-starved and anxious during a dive, it is likely I am experiencing overexertion. a. True b. False
a. True
In recreational diving, the buddy system means diving with another diver or divers in a team that provides assistance and safety benefits. a. True b. False
a. True
It is important to master buoyancy control because it affects almost everything I do in and underwater. a. True b. False
a. True
My BCD should have adequate capacity to easily float my equipment and me at the surface. a. True b. False
a. True
My body responds to anxiety with increased breathing, but slow breathing helps reduce anxiety. a. True b. False
a. True
My local dive pro will usually set up my regulator components. a. True b. False
a. True
One reason for wearing more than one weight system is that it is sometimes easier than handling a single, heavier one. a. True b. False
a. True
Regulators need periodic overhauls, typically every year to two years. a. True b. False
a. True
Snorkels are standard equipment for scuba diving because they allow me to breathe with my face in the water, or in rough conditions, without wasting my scuba air, especially when I have little scuba air remaining. a. True b. False
a. True
Some scuba divers prefer a snorkel with a flexible lower portion so it drops out of the way when not in use. a. True b. False
a. True
Streamlining benefits me as a diver because it reduces drag, which helps me save energy. a. True b. False
a. True
The LPI mechanism inflates the BCD with air from my scuba cylinder. a. True b. False
a. True
When scuba diving, normal breathing keeps your lungs equalized to the surrounding pressure. a. True b. False
a. True
While diving in a new dive environment, two benefits of seeking an orientation, supervision and/or additional training are that it helps me avoid problems and that it helps me enjoy the dive more. a. True b. False
a. True
I want to adjust my mask so the strap rests ________
above my ears, over the crown of my head
Equalization is the process of ________
adding air to an air space
The two basic fin styles are ________ fins.
adjustable and full-foot
Alternate Air Source
an extra second stage you use for sharing air with a buddy should the need arise
A cylinder with a higher working pressure always holds more air than a cylinder with a lower working pressure. a. True b. False
b. False A cylinder's capacity depends upon both its working pressure and its internal capacity
There's no real benefit to choosing the components of my scuba kit as an integrated package. a. True b. False
b. False Although the components are generally interchangeable, choosing your scuba kit as a package helps you best meet your preferences
From among masks that fit me, I should choose a mask that fits as far away from my face as possible. a. True b. False
b. False Choose a low profile that sits as close to your face as possible
Salt water causes more buoyancy than fresh water because it is less dense and weighs less. a. True b. False
b. False Salt water causes more buoyancy because it is more dense and weighs more; buoyancy results from the weight of the water displaced
My SPG is always part of my dive computer. a. True b. False
b. False Your SPG may be an independent instrument or it may be integrated into your dive computer
I should equalize ________
before I feel pain or discomfort
When choosing an alternate air source, a primary consideration involves deciding ________
between independence and simplicity
My primary considerations when choosing fins are fit and ________
blade size
The most important rule in scuba diving is to ________
breathe continuously and never hold your breath
A balloon fully inflated and sealed at 10 metres/33 feet, would probably ________ during ascent to the surface.
burst
The ________ is a safety device that relives accidental overpressure by releasing air before reaching the pressure at which the cylinder would fail.
burst disk
Accessory weights ________
can help you adjust your trim
On a day I plan to go diving, I wake up with my sinuses blocked due to a cold or allergy. I should ________
cancel the dive until I'm well
The three most important considerations in choosing scuba equipment are suitability, fit and ________
comfort
Water's density works best for me when I use the skill of ________
controlling my buoyancy
When I descend, my buoyancy tends to ________. When I ascend, it tends to ________.
decrease, increase
The most efficient way to breathe dense air underwater is to breathe ________
deeply and slowly
Trim means having the right ________ of weight.
distribution
The most important consideration when choosing a regulator is ________
ease of breathing
After 30 minutes underwater, I start to feel a bit too cool and uncomfortable. I should ________
end the dive
While diving, I start to feel cool and shorty being to shiver uncontrollably. I should ________
end the dive immediately, dry off and seek warmth
My mask encloses my nose so I can ________
equalize the mask
Scuba cylinders require pressure testing ________ and visual inspections ________
every 2-5 years, annually
My buddy and I descend to 12 metres/40 feet. I would expect to use my air ________ at 6 metres/20 feet.
faster than
Yoke
holds the first stage to the cylinder with a clamp system
First Stage
hub of your regulator that is a simple and reliable device that supplies air to all the other components
As you descend in water the pressure ________
increases
Underwater, when I inhale, my buoyancy ________
increases slightly
Before each use, I should ________ my equipment.
inspect
Underwater objects appear ________
larger and/or closer
My buddy has a bright red shoulder patch on his wet suit. If we're diving together in very clear water on a sunny day, at 12 metres/40 feet I would expect the patch to appear ________
less red than at the surface
PADI courses are performance-based. This means that to be certified, I must ________
meet specific performance requirements.
I need a mask because ________
my eyes must be in air to focus
I should have my scuba cylinder filled ________
only by reputable scuba air stations
When my snorkel is in my mouth, the tip should be ________
over the crown of my head
Trim is important for streamlining because ________
poor trim raises or lowers my feet, causing drag
My sunglasses case falls out of my pocket into the water, but fortunately, it floats so I retrieve it. I would say my sunglasses case is ________ buoyant.
positively
Overall benefits of the buddy system include ________
practicality, safety and fun
The most important feature in my weight system is its ________
quick release
One method of airway control is to inhale slowly. I can also ________ to help breathe past small amounts of water in my regulator.
raise my tongue
Second Stage
reduces the first stage intermediate pressure to the pressure around you and delivers air only when you inhale - on demand
I bring a cylinder aboard a diver boat in preparation for a trip out to a nearby reef. The normal procedure would be to ________
secure the cylinder in a rack
While scuba diving, I should breathe ________
slowly and deeply
To move efficiently as a dive, I should move ________
slowly and steadily
Pony Bottles
small cylinders with their own regulators, so they're completely separate from your main scuba kit
I'm descending and discover I can't equalize. The first thing I would do is ________
stop my descent and signal my buddy/the instructor
Submersible Pressure Gauge (SPG)
tells you the air pressure remaining in your cylinder so you can manage your air supply
The density of the air in 6 litres from the surface to 20 metres/66 feet is ________
three times greater
Overpressure/quick exhaust valves
to prevent rupturing the bladder due to overfilling, BCDs have one or more overpressure valves that automatically vent if the BCD is too full. Some may have "quick dump" valves that let you manually release air, which is sometimes easier (due to your position in the water) that using the LPI exhaust.
Inflatable Bladder
very durable bag that you inflate or deflate to change your buoyancy
To stay comfortably warm during a dive, I ________
wear an appropriate exposure suit
