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