Scuba Section 1

A depth change of 10 metres/33 feet causes a pressure change of

1 bara/ata

Buoyancy is

a force that pushes an object in water upward

I want to adjust my mask so that the strap rests

above my ears, over the crown of my head

My buddy and I descend to 12 metres/40 feet. I would expect to use my air _______6 metres / 20 feet

faster than

Although the components are generally interchangeable, choosing your scuba kits a package helps

you best meet your preferences

If you take 6 litres of air from the surface to 20 metres/66 feet, the volume will be ___ litres

2

To control my buoyancy, normally I will use my weight system and my

BCD

The LPI mechanism inflates the

BDC with air from my scuba cylinder

I should equalize

Before I feel pain or discomfort

Which are among the breathing rule I follow as a diver

Breathe continuously and never hold breath Breathe slowly and deeply Do not get winded or out of breath If face with a problem, stop, then maintain or restore slow, deep breathing

The most important rule in scuba diving is to

Breathe continuously and never hold your breath

My mask encloses my nose so I can

Equalize the mask

What are the parts of a regulator

First stage (where you breath from) Primary second stage Alternate air source SPG/computer low pressure inflator hose

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 one of these cylinders

No, until you are a PADI open water diver and a PADI enriched air diver

During descent I feel discomfort in my ears, I should

Stop, descend slightly and allow trapped air to work its way out

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

Equalization is the process of

adding air to an air space

My BCD should have

adequate capacity to easily float my equipment and me to the surface

To prepare adjustable fins, I should

adjust the straps wearing my wet suit boots

The two basic fin styles are

adjustable and full-foot

Your SPG may be

an independent instrument or it may be integrated into your dive computer

From among masks that fit me I should choose a mask that fits

as a low profile and sits as close to my face as possible

When choosing an alternate air source, the primary consideration involves deciding

between independence and simplicity

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 relieves 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

When I descend buoyancy tends to ______. When I ascend it tends to ________

decrease increase

The most efficient way to breathe dense air underwater is to breath

deeply and slowly

Trim means having the right _____ of weight

distribution

The buddy system means

diving with another diver or divers in a team that provides assistance and safety benefits

scuba cylinders require pressure testing _______, and visual inspection _________

every 2-5 years annually

Salt water causes more buoyancy than fresh water because it is less dense and weighs less

false, it causes more buoyancy because it is more dense and weighs more

My primary considerations when choosing fins are

fit and blade size

My BCD should fit

fit snugly but not restrict breathing when fully inflated

I must be able to quickly release enough weight to

float reliably in an emergency, but not necessarily all my weight

A cylinder with a higher working pressure always

holds more air than a cylinder with a lower working pressure

As you descend in water the pressure

increases

Underwater when I inhale my buoyancy

increases slightly

Before each use I should ________ my equipment

inspect

One reason for wearing more than one weight system is that

it is sometimes easier than handling a single, heavier one

Fins provide a

large surface area so my legs can push against the water effectively

As I descend, increasing pressure affects my

mask, ears, sinuses

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

Regulators need

periodic overhauls, typically every year to two years

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

quick release

Identify the four systems that make up a scuba kit

regulator cylinder weight system BCD

I bring a cylinder aboard a dive boat in preparation for a trip out to a nearby reef. The normal procedure would be to

secure it in a rack

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 signal my buddy/instructor

The three most important considerations in choosing scuba equipment are

suitability, fit and comfort

The most important consideration when choosing a regulator is

the ease of breathing

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 remaining

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

It is important to master buoyancy control because it affects almost everything I do and underwater

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

When scuba diving, normal breathing keeps your lungs equalized to the surrounding pressure

true