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Scuba Diving > Section 1 > Flashcards

Section 1 Flashcards

1
Q

As you descend in water the pressure
A. increases
B. decreases
C. does not change

A

A. increases

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2
Q 
A depth change of 10 m/33 ft causes a pressure change of
A. 1 bar/ata
B. 2 bar/ata
C. 3 bar/ata
D. 4 bar/ata
A

A. 1 bar/ata

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3
Q 
if you take 6 litres of air from the surface to 20 m/66 ft, the volume will be \_\_\_\_ litres
A. 1
B. 2
C. 3
D. 4
A

B. 2

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4
Q 
if you take 6 litres of air from the surface to 20 m/66 ft, the density of air will be \_\_\_\_ the density at the surface
A. one third
B. one half
C. three times
D. four times
A

C. three times

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5
Q

a balloon fully inflated and sealed at 10 m/33 ft, would probably ____ during ascent to the surface
A. shrink (become smaller)
B. burst

A

B. burst

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6
Q 
as I descend, increasing pressure affect(s) my
A. mask
B. ears
C. sinuses
D. skin
A

A. mask, B. ears, and C. sinuses

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7
Q 
equalization is the process by
A. adding air to an air space
B. removing air from an air space
C. reducing the surrounding pressure
D. increasing the surrounding pressure
A

A. adding air to an air space

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8
Q

a squeeze is caused by
A. wearing my wet suit or other gear too tightly
B. a pressure imbalance between the surrounding pressure and an air space

A

B. a pressure imbalance between the surrounding pressure and an air space

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9
Q 
I should equalize
A. when I feel pain or discomfort
b. only if I can't tolerate the pain or discomfort
C. before I feel pain or discomfort
D. when I reach the bottom
A

C. before I feel pain or discomfort

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10
Q

I’m descending and discover I can’t equalize. the first thing I would do is
A. equalize more forcefully
B. stop my descent and signal my buddy/the instructor
C. slow my descent and see if the problem corrects itself

A

B. stop my descent and signal my buddy/the instructor

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11
Q

I equalize gently because an extended, forceful equalization can cause permanent damage to my ears and hearing
true/false

A

true

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12
Q

on a day I plan to go diving, I wake up with my sinuses blocked due to a cold or allergy. I should
A. take an approved decongestant so I will be able to equalize
B. plan to take a lot longer as I descend
C. cancel the dive until I’m well

A

C. cancel the dive until I’m well

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13
Q

when scuba diving, normal breathing keeps your lungs equalized to the surrounding pressure
true/false

A

true

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14
Q

the most important rule of scuba diving is to
A. always dive with a buddy
B. breathe continuously and never hold your breath
C. check your air supply every five minutes

A

B. breathe continuously and never hold your breath

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15
Q

failure to follow the most important rule in scuba diving can cause severe lung expansion injuries, which can result in paralysis or death
true/false

A

true

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16
Q

during ascent I feel discomfort in my ears. I should
A. continue my ascent at a slightly faster rate
B. stop, descend slightly and allow trapped air to work its way out
C. use a decongestant before my next dive
D. equalize by blowing gently against blocked nostrils

A

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

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17
Q

my buddy and I descend to 12 m/40 ft. I would expect to use my air _____ at 6 m/20 ft
A. slower than
B. at the same rate as
C. faster than

A

C. faster than

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18
Q 
the most efficient way to breathe dense air underwater is to breathe
A. shallowly and slowly
B. shallowly and rapidly
C. deeply and slowly
D. deeply and rapidly
A

C. deeply and slowly

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19
Q

my body responds to anxiety with increased breathing, but slow breathing helps reduce anxiety
true/false

A

true

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20
Q

which of the following are among the breathing rules I follow as a diver? (choose all that apply)
A. breathe continuously and never, ever, hold my breath
B. breathe slowly and deeply
C. do not allow myself to get winded or out of breath
D. if faced with a problem, stop, then maintain or restore slow, deep breathing

A

all of them
A. breathe continuously and never, ever, hold my breath
B. breathe slowly and deeply
C. do not allow myself to get winded or out of breath
D. if faced with a problem, stop, then maintain or restore slow, deep breathing

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21
Q

Buoyancy is a force that pushes an object in water upward

true/false

A

true

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22
Q

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
A. positively
B. negatively
C. neutrally

A

A. positively

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23
Q

salt water causes more buoyancy than fresh water because it is less dense and weighs less
true/false

A

false. salt water cause more buoyancy because it is more dense and weighs more, buoyancy results from the weight of the water displaced

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24
Q 
to control my buoyancy, normally I will use my weight system and my
A. fins
B. scuba cylinder
C. wet suit
D. BCD
A

D. BCD

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25
``` when I descend, my buoyancy tends to ____. when I ascend, it tends to ____. A. increase, increase B. increase, decrease C. decrease, increase D. decrease, decrease ```
C. decrease, increase
26
underwater, when I inhale, my buoyancy A. decreases slightly B. increases slightly C. doesn't change
B. increases slightly
27
it is important to master buoyancy control because it affects almost everything I do in and underwater true/false
true
28
in recreational diving, the buddy system means diving with another diver or divers in a team that provides assistance and safety benefits true/false
true
29
overall benefits of the buddy system include A. practicality B. safety C. fun
all | practicality, safety, and fun
30
``` the three most important considerations in choosing scuba equipment are suitability, fit, and ___ A. cost and features B. color and style C. manufacturer D. comfort ```
D. comfort
31
getting the service my gear needs may be a consideration when choosing equipment true/false
true
32
``` before each use, I should____ my equipment A. inspect B. wash C. warm D. dry ```
A. inspect
33
I need a mask because A. I will inhale water without it B. my eyes must be in air to focus
B. my eyes must be in air to focus
34
my mask encloses my nose so I can A. equalize the mask B. suck the mask into place
A. equalize the mask
35
from among masks that fit me, I should choose a mask that fits as far away from my face as possible true/false
false, choose a low profile that sits as close to your face as possible
36
I want to adjust my mask so the strap rests A. below my ears, above the neck B. over my ears, below the crown of my head C. above my ears, over the crown of my head
C. above my ears, over the crown of my head
37
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/false
true
38
some scuba divers prefer a snorkel with a flexible lower portion so it drops out of the way when not in use true/false
true
39
when my snorkel is in my mouth, the tip should be A. above my forehead B. over the crown of my head C. at the base of my skull
B. over the crown of my head
40
fins provide a large surface are so my legs can push against the water effectively true/false
true
41
``` the two basic fin styles are ____ fins A. large blade and small blade B. freshwater and marine C. vented and split D. adjustable and full-foot ```
D. adjustable and full-foot
42
``` my primary considerations when choosing fins are fit and a. blade size B. material C. splits D. vents ```
A. blade size
43
to prepare adjustable fins, I should adjust the straps wearing my wet suit boots true/false
true
44
``` identify the four systems that make up a scuba kit A. a. cylinder b. regulator c. BCD d. weight system B. a. BCD b. regulator c. cylinder d. weight system C. a. cylinder b. regulator c. weight system d. BCD D. a. regulator b. cylinder c. weight system d. BCD ```
D. a. regulator b. cylinder c. weight system d. BCD
45
there's no real benefit to choosing the components of my scuba kit as an integrated package true/false
false although the components are generally interchangeable, choosing you scuba kit as a package helps you best meet your preferences
46
the LPI mechanism inflates the BCD with air from my scuba cylinder true/false
true
47
my BCD should have adequate capacity to easily float my equipment and me at the surface true/false
true
48
my BCD should fit A. very tightly and restrict breathing when fully inflated B. fit snugly but not restrict breathing when fully inflated
B. fit snugly but not restrict breathing when fully inflated
49
my buddy is rinsing a BCD and partially fills the bladder with water. is this consistent with recommended BCD care? yes or no
yes
50
``` the most important consideration when choosing a regulator is A. ease of breathing B. color C. dive/predive switch D. adjustable second stage ```
A. ease of breathing
51
``` when choosing an alternate air source, a primary consideration involves deciding A. whether to let it dangle B. where to secure it C. between independence and simplicity D. whether you really need one ```
C. between independence and simplicity
52
my SPG is always part of my dive computer | true/false
False, your SPG may be an independent instrument or it may be integrated into your dive computer
53
my local dive pro will usually set up my regulator components true/false
true
54
when setting up and wearing my kit, the alternate air source A. dangles on either side B. secures in the triangle formed by my hips and chin C. goes in a pocket on my left D. goes in a pocket on my right
B. secures in the triangle formed by my hips and chin
55
regulators need periotic overhauls, typically every year to two years true/false
true
56
the ____ is a safety device that relieves accidental overpressure by releasing air before reaching the pressure at which the cylinder would fail A. DIN valve B. burst disk C. cylinder alloy
B. burst disk
57
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
58
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? yes or no
no | until you are a PADI Open Water Diver and a PADI Enriched Air Diver
59
I bring a cylinder aboard a dive boat in preparation for a trip out to a nearby ref. the normal procedure would be to A. stand the cylinder on the deck B. lay the cylinder on the deck C. secure the cylinder in a rack
C. secure the cylinder in a rack
60
``` scuba cylinders require pressure testing ____ and visual inspection ____ A. annually, annually B. annually, every 2-5 years C. every 2-5 years, annually D. every 2-5 years, every 2-5 years ```
C. every 2-5 years, annually
61
``` I should have my scuba cylinder filled A. from any compressed air source B. with pure oxygen C. with pure nitrogen D. only by reputable scuba air stations ```
D. only by reputable scuba air stations
62
``` the most important feature in my weight system is its A. comfort B. quick release C. size D. trim ```
B. quick release
63
I must be able to quickly release enough weight to float reliably in an emergency, but not necessarily all my weight true/false
true
64
trim means having the right ____ of weight A. distribution B. amount C. shape
A. distribution
65
one reason for wearing more than one weight system is that it I sometimes easier than handling a single, heavier one true/false
true
66
accessory weights A. must have quick releases B. can help you adjust your trim C. require special training
B. can help you adjust your trim

Scuba Diving (11 decks)

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