PADI Open Water Diver 2021

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

1 bar/ata

As a newly certified PADI Open Water Diver, I will be trained to dive with buddy as deep as

18 meters/60 feet

if you take 6 liters of air from the surface to 20 meters/66 feet, the volume will be

2 liters

My buddy and I are planning a boat dive with the same type cylinders filled to 200 bar/3000 psi. Due to conditions, we are planning very conservatively. We agree on 60 bar/800 psi for our reserve. We agree that we also want an additional 30 bar/500 psi for our ascent and safety stop. This means we should begin our ascent when either of our SPGs reads

90 bar/1300 psdi

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

BCD

Which of the following are among the breathing rules I follow as a diver?

Breathe continuously and never, ever hold my breath; breathe slowly and deeply; do not allow myself to get winded or out-of-breath; if faced with a problem, stop, then maintain or restore slow, deep breathing

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

Burst valve

Identify the four systems that make up a scuba kit

Cylinder, regulator, BCD, weight system

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

False

As my buddy and I kit up, the normal practice is to be entirely independent. Helping each other is discouraged

False

I'm descending in open water with my buddies. After confirming they are ready, the next step is to signal "descend" and slowly deflate my BCD.

False

My SPG is always part of my dive computer

False

Saltwater causes more buoyancy than freshwater because it is less dense and weighs less

False

There's no real benefit to choosing the components of my scuba kit as an integrated package

False

From among masks that fit me I should choose a mask that fits as far away from my face as possible

False.

Identify the components of a regulator

First stage, primary second stage, SPG/computer, low pressure inflator hose

While my buddy and I are diving, a motorboat passes by about 300 meters/yards away. Which of the following statements is true?

I may have difficulty determining where the boat is based on sound

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

At the surface, it's a good habit to keep my mask on and my snorkel or regulator in my mouth because it helps me deal with difficulties more effectively

True

Because water is denser than air, it takes more effort to move through water

True

Buoyancy is a force that pushes an object in water upward

True

Certain medical conditions can be hazardous while diving, so it is important to answer all questions on the Medical Statement honestly and completely

True

Failure to complete 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 chill faster in water than air of the same temperature because water absorbs more heat than air does

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

If I'm tired, have labored breathing and feel air-starved and anxious during a dive, it is likely that I am experiencing overexertion.

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 an 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 buddies and I are planning a dive. Among other things, we should address how to enter and exit the water, the maximum depth and time, when to turn the dive and what to do if we get separated

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

Streamlining benefits me as a diver because it reduces drag, which helps me save energy

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

True

When diving in a new 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

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

Equalization is the process of

adding air to an air space

The two basic fin styles are __________ fins

adjustable and full-foot

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

The most important rule in scuba diving is to

breathe continuously and never hold your breath

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

burst

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

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

comfort

When I conduct a predive safety check, the "A" in the recall phrase includes

confirming adequate air pressure for the dive

Water's density works best for me when I use the skill of

controlling my buoyancy

When I descend, my buoyancy tends to ________. When I ascend, it tends to _______

decrease; increase

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

deeply and slowly

Trim means having the right _____ of weight

distribution

I should equalize

early and often, before I feel discomfort

The most important consideration when choosing a regulator is

ease of breathing

After 30 minutes underwater, I start to feel a bit too cold and uncomfortable. I should

end the dive

While diving, I start to feel cool and shortly begin to shiver uncontrollably. I should

end the dive immediately, dry off and seek warmth

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

As you descend in water the pressure

increases

Underwater, when I inhale, my buoyancy

increases slightly

Before each use I should ________ my equipment

inspect

My buddies and I plan to enter the water, but swim on the surface to a descent point about 50 meters/yards away. A primary reason we will do this because

it saves our cylinder air for the dive

Underwater objects appear

larger and/or closer

My buddy has a bright red shoulder patch on his wet suit. If we're diving together in a very clear water on a sunny day, at 12 meters/40 feet I would expect the patch to appear

less red than at the surface

As I descend, increasing pressure affects my

mask, ears, sinuses

PADI courses are performance-based. This means that to be certified, I must

meet specific performance requirements

The buddy system is _____ responsibility

my

I need a mask because

my eyes must be in air to focus

For the 50 meter/yard swim, my buddies and I will swim _________ because it is less tiring

on our backs

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

Trim is important for streamlining because

poor trim raises or lowers my feet, causing drag

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

Overexertion results from

prolonged increased effort

The most important feature in my weight system is its

quick release

One method of airway control is to inhale slowly. I can also ___________ to help breathe past small amounts of water in my regulator.

raise my tongue

If I think I'm overexerting while underwater, I should stop, signal my buddy and ________

rest

I bring a cylinder abroad 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 alternate air source

secures in the triangle formed by my hips and chin

To stay with my buddy while surface swimming, generally it works well to swim

side to side

While scuba diving, I should breathe

slowly and deeply

To move efficiently as a diver, I should move

slowly and steadily

My BCD should fit

snugly but not restrict breathing when fully inflated

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 in the previous question ("if you take 6 liters of air from the surface to 20 meters/66 feet, the volume will be...") would be ______ the density at the surface

three times

When descending with a reference, I would normally

use it as a visual reference only

To stay comfortably warm during a dive, I

wear an appropriate exposure suit