PADI Open Water Diving Section 1
Equalization is the process of
adding air to an air space
Accessory weights
can help you adjust your trim
When I descend, my buoyancy tends to ________. When I ascend, it tends to _______.
decrease, increase
As I descend, increasing pressure affects my
mask, ears, sinuses
Buoyancy is a force that pushes an object in water upward
True
The most efficient way to breathe dense air underwater is to breathe
deeply and slowly
A depth of 10 metres/33 feet causes a pressure change of
1 bar/ata
Which of the following are among the breathing rules I follow as a diver?
1) Breathe continuously and never, ever, hold my breathe. 2) Breathe slowly and deeply. 3) Do not allow myself to get winded or out-of-breath. 4) If faced with a problem, stop, then maintain or restore slow, deep breathing.
I should equalize
Before I feel pain or discomfort
There's no real benefit to choosing the components of my scuba kit as an integrated package
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
False. Choose a low profile that sits as close to your face as possible.
I'm renting a scuba cylinder at a dive resort. Among the cylinders for hire, some have green and yellow bands that read "Nitrox." As a PADI Open Water Diver with no other training or instructor supervision, am I qualified to use these cylinders?
No (Until you are a PADI Open Water and a PADI Enriched Air Diver)
Certain medical conditions can be hazardous while diving, so it is important to answer all questions on the Medical Statement honestly and completely
True
The LPI mechanism inflates the BCD with air from my scuba cylinder.
True
My buddy is rinsing a BCD and partially fills the bladder with water. Is this consistent with recommended BCD care?
Yes
A squeeze is caused by
a pressure imbalance between the surrounding pressure and an air space
I want to adjust my mask so the strap rests
above my ears, over the crown of my head
The two basic fin styles are _______ fins.
adjustable and full-foot
Your regulator consists of
alternate air source, SPG/computer, first stage, low pressure inflator hose, primary second stage
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
A balloon fully inflated and sealed at 10 metres/33 feet, would probably _______ during acsent to the surface.
burst
The _____________ is a safety device that relieves accidental overpressure by releasing air before reaching the pressure at which the cylinder would fail
burst disk
On a day I plan to to go diving, I wake up with my sinuses blocked due to a cold or allergy. I should
cancel my dive until I'm well
The three most important considerations in choosing scuba equipment are suitability, fit, and _____
comfort
Trim means having the right _____ of weight
distribution
The most important consideration when choosing a regulator is
ease of breathing
My mask encloses my nose so I can
equalize the mask
Scuba cylinders require testing _________ and visual inspection ___________
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
My BCD should fit
fit snugly but not restrict breathing when fully inflated
As you descend in water the pressure
increases
Underwater when I inhale my buoyancy
increases slightly
Before each use I should ________ my equipment
inspect
PADI courses are performance based. This means that to be certified, I must..
meet specific performance requirments
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
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
Identify the four systems that make up a scuba kit.
regulator, cylinder, weight system, BCD
When setting up and wearing my kit, the alternate air source
secures in the triangle formed by my hips and chin
I'm descending and discover I can't equalize. The first thing I would do is
stop my descent and see if the problem corrects itself
During ascent I feel discomfort in my ears. I should
stop, descend slightly and allow trapped air to work its way out.
As a newly certified PADI Open Water Diver, I will be trained to dive with 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
The density of the air in the previous question would be ______ the density at the surface
3x
To control my buoyancy, normally I will use my weight system and my
BCD
The most important rule in scuba diving is to
Breathe continuously and never hold your breath
A cylinder with higher working pressure always holds more air than a cylinder with lower working pressure
False. A cylinder's capacity depends upon both its working pressure and its internal capacity
Salt water causes more buoyancy than fresh water because it is less dense and weighs less
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
False. Your SPG may be independent instrument or it may be integrated into your dive computer.
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.
True
Failure to follow the most important rule in scuba diving can cause severe lung overexpansion injuries, which can result in paralysis or death.
True
Fins provide a large surface area so my legs can push against the water effectively
True
Getting the service my gear needs may be a consideration when choosing equipment
True
I equalize gently because an extended, forceful equalization can cause permanent damage to my ears and hearing
True
I must be able to quickly release enough weight to float reliably in an emergency, but not necessarily all my weight
True
In recreational diving, the buddy system means diving with another diver or divers in a team that provides assistance and safety benefits.
True
It is important to master buoyancy control because it affects almost everything I do in and underwater.
True
My BCD should have adequate capacity to easily float my equipment and me at the surface
True
My body responds to anxiety with increased breathing but slow breathing helps to reduce anxiety
True
My local dive pro will usually set up my regulator components
True
One reason for wearing more than one weight system is that it is sometimes easier than handling a single, heavier one.
True
Regulators need periodic overhauls typically every year to two years
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
True
Some scuba divers prefer a snorkel with a flexible lower portion so it drops out of the way when not in use.
True
To prepare adjustable dins, I should adjust the straps wearing my wet suit boots.
True
When 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.
True
When scuba diving, normal breathing keeps your lungs equalized to the surrounding pressure
True