Open Water Diver: Section 1

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

1 bar/ata

What are the four breathing rules for a scuba diver?

1. breathe continuously and never, ever, hold your breath 2. breathe slowly and deeply 3. do not allow yourself to get winded or out of breath 4. if faced with a problem, stop, then reduce anxiety by maintaining or restoring slow, deep breathing

What are the 3 overall benefits of the buddy system?

1. practicality 2. safety 3. fun

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

True or 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

True or False: My SPG is always apart of my dive computer

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

True or False: 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

True or False: There is 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

True or False: 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 one of these cylinders?

No

True of False: When scuba diving, normal breathing keeps your lungs equalized to the surrounding pressure

True

True or False: Buoyancy is a force the pushes an object in water upward

True

True or False: Failure to follow the most important rule in scuba diving can cause severe injuries, which can result in paralysis or death

True

True or False: Fins provide a large surface area so my legs can push against water effectively

True

True or False: Getting the service my gear needs may be a consideration when choosing equipment

True

True or False: I equalize gently because an extended, forceful equalization can cause permanent damage to my ears and hearing

True

True or False: I must be able to quickly release enough weight to float reliably in an emergency, but not necessarily all my weight

True

True or False: In recreational diving, the buddy system means diving with another diver or divers in a team that provides assistance and safety benefits

True

True or False: It is important to master buoyancy control because it affects almost everything I do in and underwater

True

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

True

True or False: My body responds to anxiety with increased breathing, but slow breathing helps reduce anxiety

True

True or False: My local dive pro will usually set up my regulator components

True

True or False: One reason for wearing more than one weight system is that it is sometimes easier than handling a single, heavier one

True

True or False: Regulators need periodic overhauls, typically every year to two years

True

True or False: 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

True or False: Some scuba divers prefer a snorkel with a flexible lower portion so it drops out of the way when not in use

True

True or False: The LPI mechanism inflates the BCD with air from my scuba cylinder

True

True or False: To prepare adjustable fins, I should adjust the straps wearing my wet suit boots

True

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

Equalization is the process of___

adding air to an air space

The two basic fin styles are ___ fins

adjustable and full-foot

Identify the five components of a regulator

alternate air source SPG/computer first stage low pressure inflator hose primary second stage

How often should you equalize?

before you feel pain or discomfort

When choosing an alternative air source, a primary consideration involves deciding___

between independence and simplicity

My primary considerations while choosing fins are fit and___

blade size

What is the most important rule in scuba diving?

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 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. What should I do?

cancel the dive until I'm well

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

comfort

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

What three major body air spaces does increasing pressure affect as I descend?

ears sinuses mask

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 pressure 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 does the pressure increase, decrease, or stay the same?

increase

Underwater, when I inhale, my buoyancy___

increases slightly

Before each use, I should ___ my equipment

inspect

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

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 out to a nearby reef. The normal procedure would be to___

secure the cylinder in a rack

When setting up and wearing my kit, the alternative air source___

secures in a 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/the instructor

During ascent I feel discomfort in my ears. I should

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

The density of the air at 20 metres/66 feet would be ___ the density at the surface

three times

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

yes