PADI Open Water Diver Final Exam |Questions and Verified Answers | 100% Correct| Grade A (Latest 2023/ 2024 Update)
PADI Open Water Diver Final Exam
|Questions and Verified Answers | 100%
Correct| Grade A (Latest 2023/ 2024 Update)
Q: The most efficient way to breathe dense air underwater is to breathe
Answer:
deeply and slowly
Q: Buoyancy
Answer:
a force that pushes an object in water upward
Q: Salt water causes more buoyancy than fresh water because it is _ dense and weighs
Answer:
more
Q: When I descend, my buoyancy tends to _. When I ascend, it tends to
Answer:
decrease, increase
Q: The three most important considerations in choosing scuba equipment are suitability, fit, and
Answer:
comfort
Q: The two basic fin styles are __ fins
Answer:
adjustable and full-foot
Q: My primary considerations when choosing fins are fit and
Answer:
blade size
Q: BCD (buoyancy control device)
Answer:
holds your kit together and allows you to adjust buoyancy throughout the dive
Q: Regulator
Answer:
delivers breathing air at the surrounding pressure when you inhale and directs exhaled air into
the air
Q: Cylinder
Answer:
holds the high-pressure breathing air supplied by your regulator during the dive
Q: Weight System
Answer:
holds lead weight to counteract the positive buoyancy of your body and some of your equipment,
with a mechanism for dropping some or all the weight in an emergency
Q: The five components that make up a BCD include
Answer:
an inflatable bladder, a cylinder band and harness/jacket, an LPI (low-pressure inflator)
mechanism, an overpressure/quick exhaust valves, and a weight system
Q: LPI mechanism
Answer:
inflates the BCD with air from my scuba cylinder
Q: Burst disk
Answer:
a safety device that relieves accidental overpressure by releasing air before reaching the pressure
at which the cylinder would fail
Q: scuba cylinders require pressure testing and visual inspection __
Answer:
every 2-5 years, annually
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As a newly certified PADI Open Water Diver, I will be trained to dive with buddy as deep as
18 metres/60 feet
As you descend in water, the pressure
increases
A depth change of 10 metres/33 feet causes a pressure change of
1 bar/ata (atmosphere)
if you take 6 liters of air from the surface to 20 metres/66 feet, the volume will be
2 litres (the density of the air would be three times the density at the surface)
A balloon fully inflated and sealed at 10 metres/33 feet, would probably __ during ascent to the surface
burst
A squeeze is caused by
a pressure imbalance between the surrounding pressure and an air space
Equalization is the process of
adding air to an air space
The most important rule in scuba diving is to
breathe continuously and never hold your breath
During ascent I feel discomfort in my ears. I should
stop, descend slightly, and allow trapped air to work its way out
My buddy and I descend to 12 metres/40 feet. I would expect to use my air _ at 6 metres/20 feet
faster than
The most efficient way to breathe dense air underwater is to breathe
deeply and slowly
Buoyancy
a force that pushes an object in water upward
Salt water causes more buoyancy than fresh water because it is _ dense and weighs _
more
When I descend, my buoyancy tends to _. When I ascend, it tends to
decrease, increase
The three most important considerations in choosing scuba equipment are suitability, fit, and
comfort
The two basic fin styles are __ fins
adjustable and full-foot
My primary considerations when choosing fins are fit and
blade size
BCD (buoyancy control device)
holds your kit together and allows you to adjust buoyancy throughout the dive
Regulator
delivers breathing air at the surrounding pressure when you inhale and directs exhaled air into the air
Cylinder
holds the high-pressure breathing air supplied by your regulator during the dive
Weight System
holds lead weight to counteract the positive buoyancy of your body and some of your equipment, with a mechanism for dropping some or all the weight in an emergency
The five components that make up a BCD include
an inflatable bladder, a cylinder band and harness/jacket, an LPI (low-pressure inflator) mechanism, an overpressure/quick exhaust valves, and a weight system
LPI mechanism
inflates the BCD with air from my scuba cylinder
Burst disk
a safety device that relieves accidental overpressure by releasing air before reaching the pressure at which the cylinder would fail
scuba cylinders require pressure testing and visual inspection __
every 2-5 years, annually
The most important feature in my weight system is its
quick release
Trim means having the right _ of weight
distribution
Failure to follow the most important rule in scuba diving can cause serious lung overexpansion injuries, which in turn can cause paralysis and death
true
An object that is neutrally bouyant in fresh water will _ in salt water
float
Underwater objects appear
larger and/or closer
Sound travels about 4 times _ in water than in air, making it difficult to determine its source
faster
To move efficiently as a diver, I should move
slowly and steadily
Trim is important for streamlining because
poor trim raises or lowers my feet, causing drag
Overexertion results from
a prolonged increased effort
Buddy Predive Safety Check
Begin With Review And Friend
BCD, Weight, Releases, Air, Final Check
If my buddy and I get separated, the general procedure is to
look for each other for no more than a minute, then reunite on the surface
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 psi
My buddy and I have just started our descent. I begin equalizing
immediately, as soon as my head goes underwater
During my descent, to control my buoyancy I add air to my BCD
in small amounts, frequently
To start my ascent, I should
swim up gently
To control my buoyancy while ascending, I should
vent my BCD with in small amounts frequently
A safety stop is a stop between _ and _ for three to five minutes
6 m/20 ft, 3 m/10 ft
When I reach the surface, the first thing I do is _
inflate my BCD
Wet suit
most common exposure suits; provide insulation and protection; made with neoprene; doesn’t keep you dry
Dry suit
provide the most insulation; keeps you dry with special watertight zippers and seals; most effective option for cooler water diving
Skin suit
aka body suits; provide little or no insulation; worn in warmer water for protection from minor cuts, scrapes, stings, and sunburn
Which type of exposure suit requires special training?
dry suit
Which type of exposure suit requires a snug fit, without which water would carry away heat or it would be uncomfortable?
wet suit
A hood is important when diving in water cooler than approximately
21 degrees Celsius/ 70 degrees Fahrenheit
Which cutting tool is a bladed hook for cutting fishing line or net?
z-knife
What are three primary instruments I would normally have while diving?
SPG, dive computer, compass
Conditions that affect me while diving include
temperature, water movement, sunlight, aquatic life, and bottom composition
In most environments, as I go deeper the water gets
colder
Particles made of fine material affect visibility by
remaining suspended for long periods
The two types of water motion that affect me as a diver are
waves and current
If I were caught in a current and carried downstream past my planned exit, I should swim _ the current
across
The most common injury divers suffer may be
sunburn
“Diving within my limits” simply means diving within the limits of my
training, experience, and comfort
The type of interaction I should generally have with aquatic life is
passive
Potentially hazardous aquatic animals are, broadly, those that _ and those that __
sting/puncture, bite
While underwater near a kelp forest, my buddy and I see a large shark approach. We should
remain calm, near the bottom, and watch it
One potential hazard of some plants and kelp is
entanglement
_ and _ generally determine the best way to wade in and out or how soon I put my fins on
bottom composition, aquatic life
My buddy and I experience mild surge after entering the water. We may be able to adjust for this by diving
deeper
Tides affect conditions related to diving including
currents, depth, and visibility
While entering through mild turf, as a wave approaches, I should stand
sideways to it
By accident, I find myself in a strong current rushing rapidly away from shore. Generally, I should inflate my BCD and swim
parallel to shore
My buddy and I are boat diving with a mild current. After entering, we would use the _ line to pull ourselves to the _ line, which we will descend along to the bottom
swim, mooring/anchor
The four stages of dive planning are
advance planning, preparation planning, last-minute preparation, and predive planning
Typically, I decide on a dive buddy or dive operator during
advance planning
_ is what I do a few hours before, to right up to when I leave for the dive site
last-minute preparation
I want to begin _ at least a day or two before the dive
preparation planning
During _, my buddy and I settle on details and make decisions based upon what we find at the dive site
predive planning
When assisting a responsive diver at the surface, I always begin by
establishing buoyancy for myself and the diver
After establishing buoyancy for both of us, the primary concerns with an unresponsive diver at the surface are _ and __
checking for breathing, providing rescue breaths if needed
To breathe from a freeflowing regulator, I should hold the second stage
with the mouthpiece pressed against my lips
At a minimum, I should have _ visual and _ audible surface signaling devices
1, 1
The visual signaling device that I might use to signal aircraft is a
signal mirror
The __ flag indicates that a vessel has divers in the water and can’t maneuver
Alpha
If there are no specific laws, the rule of thumb is that I should stay within __ of my dive flag
15 metres/50 feet
One way to avoid disorientation while descending and ascending is to
follow a reference
During an underwater cleanup, my buddy and I fill up a large mesh utility bag with several kilograms/pounds of garbage. We should
carry the bag in our hands
When choosing a slate, the main option I usually consider is
size
I log my dives
to document training, as a reference tool, to share information, keep related information
The minimum information I would typically log includes
dive site name, the depth, dive time, and my buddy’s name
What might I have in a spare parts kit?
spare mask strap, fin straps, harness/weight belt buckle, cable (pull) ties, adjustable wrench (spanner), pliers, screw drivers, hex wrenches (allen keys), regulator mouthpiece, accessory clip, various sized cylinder valve/ DIN valve o-rings
Before diving, I should refrain using _ and __
alcohol, tobacco
As a new PADI Open Water Diver, I should refresh my dive skills with a PADI ReActivate after _ of inactivity
six months
For practical purposes, air consists of oxygen (about 21%) and
nitrogen (about 79%)
The two primary factors that influence how much nitrogen dissolves into my body tissues during a dive are _ and _
depth, time
If I exceed established depth and time limits while diving and then surface, bubbles can form in my body tissues, causing __
decompression sickness
__ track the amount of theoretical nitrogen in my body by measuring the depth and time throughout the dive
dive computers
A no stop dive means I can, if necessary, ascend directly to the surface without stopping _ the dive
at any time during
Repetitive dive
a dive made while I still have theoretical residual nitrogen in my body
Dive tables like the RDP and eRDPml use __ tables to calculate repetitive dives
three
Advantages of a dive computer over dive tables include dive computers
are easier to use than tables, help offset human error, and give me more time underwater
Before, during, and/or between dives, my computer will tell me
no stop limits, the ascent rate, emergency decompression information, and previous dive information
The first step in setting up my dive computer is
read the manufacturer instructions
I would find a minimum surface interval when, after a dive, I want to know how long the _ would be
time at the surface
One way to find a _ with a computer is to periodically check the no stop times for the depth you want, between dives
minimum surface interval
Going to altitude after diving may be a problem because the
lower pressure can increase DCS risk
My buddy and I have made two no stop dives for the last two days. Based on current recommendations, we should wait at least _ after our last dive before flying
18 hours
When diving at an altitude of _ or higher, I need to use altitude diving procedures
300 metres/1000 feet
Cold and/or strenuous dives may be a problem with respect to DCS because
I may end the dives with more dissolved nitrogen than calculated by dive computers or tables
Using the RDP Table or eRDPml, I should calculate a dive as
4 metres/10 feet deeper than the actual depth
If I go over a no stop limit, I
will have to make one or more emergency decompression stops
The term “decompression illness”
includes both lung overexpansion and DCS
Treatment for most cases of DCI requires
recompression in a chamber
Gas narcosis
Thought to be caused by the increased amount of dissolved gases in body tissues slowing nerve impulses that travel in the brain and nervous system
Most divers usually begin to notice gas narcosis at a depth of approximately
30 metres/100 feet
The __ is always my direction of travel when navigating with a compass
lubber line
I should hold my line so the _ is aligned with the centerline of my body
lubber line
As I swim while navigating with a compass, I should keep the _ within the index marks
north needle
I’ve just finished a single no stop dive with my buddy. We have not been diving in the past several days, and this is the only dive we make. Based on current recommendations, the minimum surface interval before we fly is
12 hours
My buddy and I want to travel in a straight line using a compass, I should point the in our desired travel direction, then rotate the until the is/are over the
lubber line, bezel, index marks, magnetic north needle