Diving Section One

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

1 bar/ata

Accessory weights

Can help you adjust your trim

I should have my scuba cylinder filled

Only by reputable scuba air stations

My BCD should have adequate capacity to easily float my equipment and me at the surface

True

A squeeze is caused by

a pressure imbalance between the surrounding pressure and an air space

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

2

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

Two basic fin styles are ____ & ____ fins

Adjustable and full foot

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

BCD

I should equalize

Before I feel pain or discomfort

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

The ______ is a safety device that relives accidental overpressure by releasing air before reaching the pressure at which the cylinder would fail

Burst disk

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 am well

The three most important considerations in choosing scuba equipment are suitability, fit, and _____

Comfort

When I descend, my buoyancy tends to ______. When I ascent, 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

As I descend, increasing pressure affects my

Ears Sinuses Mask

The most important consideration when choosing a regulator is

Ease of breathing

My mask closes my nose so I can

Equalize the mask

Suba cylinders require pressuring testing ______ and visual inspection _____

Every 2-5 years, annually

From month masks that fit me, I should choose a mask that fits as far away from my face as possible T/F?

False

Salt water causes more buoyancy than fresh water because it is less dense and weighs less T/F?

False

Theres no real benefit to choosing the components of my scuba kit as an integrated package T/F?

False

A cylinder with a higher working pressure always holds more air than a cylinder with a lower working pressure

False. A cylinder's capacity depends upon both its working pressure and its internal capacity

My SPG is always part of my dive computer T/F?

False. Your SPG may be an independent instrument or may be integrated into your dive computer

My BCDD should fit

Fit snugly but not restrict my breathing when fully inflated

As you descend in the water the pressure

Increases

Before each use, I should ___________ my equipment

Inspect

I need a mask because

My eyes must be in air to focus

Im renting a scuba cylinder at a dive resort. Month 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

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 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

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

Secure the cylinder in a rack

When setting up and wearing my it, 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 dive descent and signal my buddy/the instructor

During ascent I feel discomfort in my ears. I should

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

If you take 6 litres of air from the surface to 20 metres/66 feet, the volume will be 2 litres. The density of the air would be _______ the density at the surface

Three times

Buoyancy is a force that pushes an object in water upward T/F

True

Failure to follow the most important rule in scuba diving can cause severe lung over expansion injuries, which can result in paralysis or death T/F?

True

Fins provide a large surface area so my legs can push against the water effectively T/F?

True

Getting the service my gear needs may be a consideration when choosing equipment T/F?

True

I equalize gently because an extended, forceful equalization can cause permanent damage to my ears and hearing T/F?

True

I must be fully able to quickly release enough weight to float reliably in an emergency, but not necessarily all my weight T/F?

True

In recreational diving, the buddy system means diving with another diver or divers in a team that provides assistance and safety benefits T/F?

True

It is important to master buoyancy control because it affects almost everything I do in and underwater T/F?

True

My local dive pro will usually set up my regulator components T/F?

True

One reason for wearing more than one weight system is that it is sometimes easier than handling a single, heavier one T/F?

True

Regulators need periodic overhauls, typically every year to two years T/F?

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 T/F?

True

Some scuba divers prefer a snorkel with a flexible lower portion so it drops out of the way when not in use T/F?

True

The LPI mechanism inflates the BCD with air from my scuba cylinder

True

To prepare adjustable fins, I should adjust the straps wearing my wet suit boots T/F?

True

When scuba diving, normal breathing keeps your lungs equalized to the surrounding pressure T/F?

True

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

Whether to let it dangle

My buddy is rinsing a BCD and it partially fills the bladder with water. Is this consistent with the recommended BCD care?

Yes

A balloon fully inflated and sealed at 10 metres/33 feet, would probably ______ during ascent to the surface

burst

My buddy and I descent to 12 metres/40 feet. I would expect myself to use my air ______ at 6 metres/20 feet

faster than

Underwater, when I inhale, my buoyancy

increases slightly