PADI Open Water Diver
A depth change of 10 meters/33 feet causes a pressure change of 1, 2, 3, or 4 bar/ata?
1 bar/ata
If you take 6 litres of air from the surface to 20 metres/66 feet, the volume will be [blank] litres. 1,2,3,4
2
The density of 6 liters of air at 20 metres/66 feet would be [blank] the density at the surface
3 times
Overall benefits of the buddy system include - choose all that apply - practicality, safety, fun
All of them
Which of the following are among the breathing rules I follow as a diver? Choose all that apply: Breathe continuously and never, ever hold my breath. Breathe slowly and continuously, do not allow myself to get winded or out of breath. If faced with a problem, stop, then maintain or restore slow, deep breathing.
All of them
To control my buoyancy, normally I will use my weight system and my [blank]
BCD
As I descend, I need to equalize air spaces. Which of the following are accepted way if equalizing my ears? a. Block my nose and attempt to gently blow through it b. Swallow and wiggle the jaw from side to side c. Block my nose and blow forcefully for an extended period
Block my nose and attempt to gently blow through it, swallow and wiggle the jaw from side to side
The most important rule in scuba diving is
Breathe continuously and never hold my breath
What is buoyancy?
Buoyancy is an upward force produced from a liquid pushing on an object.
What should my buddy and I agree upon when planning a dive?
Decide 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.
There is no way to use a DIN regular on a yoke cylinder valve
False, you can use it with an adapter
A cylinder with a higher working pressure always holds more air than a cylinder with a lower working pressure, true/false
False. A cylinder's capacity depends upon both its working pressure and its internal capacity
There's no real benefit to choosing the components of my scuba kit as an integrated package, True or false
False. Although the components are generally interchangeable, choosing your scuba kit as a package helps you best meet your preferences.
From among masks that fit me I should choose a mask that fits as far away from my face as possible, True or false
False. Choose a low profile that sits as close to your face as possible.
Salt water causes more buoyancy than fresh water because it is less dense and weighs less. True or false?
False. Salt water causes more buoyancy because it is more dense and weighs more; buoyancy results from the weight of the water displaced.
My SPG is always part of my dive computer, T/F
False. Your SPG may be an independent instrument or it may be integrated into your dive computer.
I'm planning to dive the following week and am checking my gear. I put my kit together and notice my regulator seems to breathe harder than I remember. What should I do?
Have it inspected and serviced as needed by a professional before using it.
While my buddy and I are diving, a motorboat passes by about 300 metres/yards away. Which of the following statements is true? a. It will sound farther away - quieter - than in air b. I may have difficulty determining where the boat is based on the sound c. It will sound like it is straight below me.
I may have difficulty determining where the boat is based on the 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 supervisor, am I qualified to use one of these cylinders? Y/N?
No
If I'm tired, have labored breathing and feel air-starved and anxious during a dive, it is likely I am experiencing ______________.
Overexertion.
My sunglasses case falls out of my pocket into the water, but fortunately, it floats so I retrieve it. I would say my sungalsses case is [blank] buoyant.
Positively
What are the three overall benefits of the buddy system?
Practicality, safety, and fun
What does "Begin with Review and Friend" stand for in diving?
Pre-dive check: Begin = BCD, With = Weight, Review = Releases, And = Air, Friend = Final Check.
During a dive, I swim hard to keep up with a fish that interests me, but shortly begin to feel like I can't get enough air. The correct action would be to:
Stop all activity and rest to restore proper deep, slow breathing.
If I feel discomfort in a body air space while ascending, the correct action is to:
Stop, descend slightly and give trapped air time to work its way out.
Failure to follow the most important rule in scuba diving can cause serious lung over expansion - lung rupture - injuries, which in turn can cause paralysis and death
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
True
Fins provide a large surface area so my legs can push against the water effectively, true or false
True
Getting the service my gear needs may be a consideration when choosing equipment, true or false
True
I chill faster in water than in air of the same temperature because water absorbs more heat than air does
True
I must be able to quickly release enough weight to float reliably in an emergency, but not necessarily all my weight, True/False
True
I should not dive with a cold, nor use medications to dive with a cold
True
In recreational diving, buddy system means diving with another diver or divers in a team that provides assistance and safety benefits, true or false?
True
It is important to master buoyancy control because it affects almost everything I do in and underwater. True or false?
True
It is important to master buoyancy control because it allows me to control whether I descend, float or am neutrally buoyant. I adjust my buoyancy frequently while diving.
True
My BCD should have adequate capacity to easily float my equipment and me at the surface, true or false
True
My body responds to anxiety with increased breathing, but slow breathing helps reduce anxiety. True or false?
True
My local dive pro will usually set up mar 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, True/False
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 or false
True
Some scuba divers prefer a snorkel with a flexible lower portion so it drops out of the way when not in use, true or false
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 or false?
True
The three overall benefits of the buddy system are practicality, safety and fun.
True
To prepare adjustable fins I should adjust the straps wearing my wet suit boots, true or false
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
Overexertion results from
a prolonged increased effort
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
During a descent, I try to equalize but discover I'm having trouble doing so. Which of the following is correct? a. Slow my descent, signal my buddy to slow down, and equalize more forcefully b. Stop my descent, signal my buddy, ascend slightly and try again. c. Continue my descent while equalizing repeatedly. d. Signal my buddy, ascend to the surface and start my descent over.
b. Stop my descent, signal my buddy, ascend slightly and try again.
When should I equalize?
before I feel pain or discomfort
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 metres/33 feet, would probably [blank] 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 am well
Water's density works best for me when I use the skill of
controlling my buoyancy
When I descend, my buoyancy tends to [blank]. When I ascend, it tends to [blank].
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
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 cool and uncomfortable. 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 [blank] at 6 metres/20 feet. slower than, faster than, at the same rate as...
faster than
An object that is neutrally buoyant in fresh water will _____ in salt water.
float
As you descend in water the pressure increases, decreases or doesn't change?
increases
Underwater, when I inhale, my buoyancy [blank]
increases slightly
Before each use, I should [blank] my equipment
inspect
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 very clear water on a sunny day, at 12 metres/40 feet, I would expect the patch to appear
less red than at the surface
As I descend, increasing pressure affects my - choose all that apply - mask, ears, sinuses, skin
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
Trim is important for streamlining because
poor trim raises or lowers my feet, causing drag
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
Identify the four systems that make up a scuba kit
regulator, cylinder, weight system, BCD
If I think I'm overexerting while underwater, I should stop, signal my buddy and ________
rest
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 alternate air source
secures in the triangle formed by my hips and chin
My buddy and I are planning a dive to 18 metres/60 feet. We would expect our air supply to last _________ at 10 meters/33 feet, all else being the same.
shorter than
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
Why do I equalize gently
so I don't cause permanent damage to my ears and hearing
I'm descending and discover I can't equalize. The first thing I would do is
stop my descent and signal my buddy
During ascent I feel discomfort in my ears. I should
stop, descend slightly and allow trapped air to work its way out
The three most important considerations in choosing scuba equipment are [blank, blank, and blank]
suitability, fit and comfort
The primary considerations when choosing any piece of scuba gear are
suitability, fit, and comfort
Because water is denser than air, it takes more effort to through water
true
To stay comfortably warm during a dive, I
wear an appropriate exposure suit
