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