Section 2 Flashcards
underwater objects appear
A. larger and/or closer
B. smaller and/or more distant
C. the same as they do in air
a. 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 m/40 ft I would expect the patch to appear
A. a more vivid red
B. less red than at the surface
C. blue
B. less red than at the surface
while my buddy and I are diving, a motorboat passes by about 300 meters/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
B. I may have difficulty determining where the boat is based on the sound
because water is denser than air, it takes more effort to move through water
true/false
true
to move efficiently as a diver, I should move A. quickly and steadily B. quickly and sporadically C. slowly and steadily D. slowly and sporadically
C. slowly and steadily
streamlining benefits me as a diver because it reduces drag, which helps me save energy
true/false
true
trim is important for streamlining because
A. poor trim raises or lowers my feet, causing drag
B. it means I have the correct amount of weight
A
you can have poor trim with the correct amount of weight
water's density works best for me when I use the skill of A. shallow, rapid breathing B. clearing water from my mask C. equalizing my ears, sinuses and mask D. controlling my buoyancy
D. controlling my buoyancy
I chill faster in water than in air of the same temperature because water absorbs more heat than air does
true/false
true
to stay comfortable warm during a dive, I
A. wear an appropriate exposure suit
B. never dive in water colder than 24 degrees C/75 degrees F
A. wear an appropriate exposure suit
after 30 minutes underwater, I start to feel a bit too cool and uncomfortable. I should
A. increase my activity
B. keep my arms by my sides
C. end the dive
C. end the dive
while diving, I start to feel cool and shortly begin to shiver uncontrollably. I should
A. increase my activity
B. keep my arms by my sides
C. end the dive immediately, dry off and seek warmth
C. end the dive immediately, dry off and seek warmth
while scuba diving, I should breathe
A. rapidly and shallowly
B. slowly and deeply
B. slowly and deeply
one method of airway control is to inhale slowly. I can also \_\_\_\_ to help breathe past small amounts of water in my regulator A. tilt my head upward B. press the purge button C. close and reopen the cylinder valve D. raise my tongue
D. raise my tongue
if I’m tired, have labored breathing and feel air starved and anxious during a dive, it is likely I am experiencing overexertion
true/false
true
overexertion results from
A. slow, deep breathing
B. a prolonged increased effort
C. normal swimming
B. a prolonged increased effort
if I think I'm overexerting while underwater, I should stop, signal my buddy and A. rest B. ascend immediately C. use purge assisted breathing D. fully inflate my BCD
A. rest
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/false
true
as my buddy and I kit up, the normal practice is to be entirely independent. helping each other is discouraged
true/false
false
buddies normally help each other. how much you assist each other depends on the situation
when I conduct a predive safety check, the “A” in the recall phrase includes
A. assuring that all releases are secure
B. confirming adequate air pressure for the dive
C. adjusting the BCD
D. addressing weight system issues
B. confirming adequate air pressure for the dive
if my buddy and I get separated, the general procedure is to
A. return to where I last saw my buddy and wait
B. search until we reunite or until I run low on air
C. bang on my cylinder to get my buddy’s attention with sound
D. look for each other for no more than a minute, then reunite on the surface
D. look for each other for no more than a minute, then reunite on the surface
the buddy system is \_\_\_\_ responsibility A. my B. the divemaster's C. my buddy's D. no one's
A. my
my buddy and I are planning a boat dive with the same type cylinders filled to200 bar/3000 psi. due to condition, we are planning very conservatively. we agree on 60 bar/800 psi for our reserve. we agree that we also want an additional 30/500 psi for our ascent and safety atop. this means we should begin our ascent when either of our SPGs reads A. 50 bar/800 psi B. 70 bar/1000 psi C. 90 bar/1300 psi D. 110 bar/1700 psi
C. 90 bar/1300 psi
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/false
true
my buddies and I plan to enter the water, but swim on the surface to a descent point about 50 m/yards away. a primary reason we will do this is because
A. it’s easier then descending immediately
B. it saves our cylinder air for the dive
C. we enjoy the exercise
B. it saves our cylinder air for the dive
for the 50 m/y swim, my buddies and I will swim ____ because it is less tiring
A. face down
B. on our backs
B. on our backs
to stay with my buddy while surface swimming, generally it works well to swim
A. side by side
B. with the faster diver in front
C. with the slower diver in front
A. side by side
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
true/false
false
you orient yourself, switch to your regulator and check your dive computer or timing device before deflating your BCD
when descending with a reference, I would normally
A. make physical contact with it
B. ignore the reference and use my dive computer
C. use it as a visual reference only
C. use it as a visual reference only
my buddy and I have just started our descent. I begin equalizing
A. immediately, as soon as my head goes underwater
B. at approximately 3 m/10 ft
C. when I feel discomfort
D. when I see my buddy equalize
A. immediately, as soon as my head goes underwater
as I descend while wearing a wet suit, my buoyancy will tend to
A. increase
B. decrease
C. remain constant
B. decrease
during my descent, to control my buoyancy I add air to my BCD
A. use long, infrequent bursts
B. when I reach the bottom
C. in small amounts, frequently
C. in small amounts, frequently
before starting my ascent, I should check my dive computer to be sure I’m within its limits
true/false
true
to start my ascent, I should A. drop some weights B. add air to my BCD C. push off the bottom D. swim up gently
D. swim up gently
when I’m ascending, I should ascend
A. quickly - no slower than 18 m/60 ft per minute
B. slowly - at my computer’s required rate
C. at any rate with which I’m comfortable
B. slowly - at my computer’s required rate
I’m ascending rom a dive during which I’m wearing a wet suit. my buoyancy will ____ as I ascend, unless I adjust with my BCD
A. increase
B. decrease
C. remain the same
A. increase
to control my buoyancy while ascending, I should
A. vent my BCD in large amounts infrequently
B. vent my BCD in small amounts frequently
C. add air to my BCD
B. vent my BCD in small amounts frequently
I would never find it necessary to ascend without a reference
true/false
false
you may have t ascend away from a planned reference due to losing direction or to handle an emergency or problem
a safety stop is a stop between \_\_\_\_ and \_\_\_\_ for three to five minutes A. 3 m/10 ft, 0 m/0 ft B. 4 m/12 ft, 2 m/6 ft C. 6 m/20 ft, 3 m/10 ft D. 9 m/30 ft, 6 m/20 ft
C. 6 m/20 ft, 3 m/10 ft
when I reach the surface, the first thing I do is
A. switch to my snorkel
B. signal the bat
C. inflate my BCD
C. inflate my BCD
I wear an exposure suit while diving for ____ and ____
A. streamlining, protection
B. streamlining, warmth
C. protection, warmth
C. protection, warmth
which type of exposure suit requires a snug fit, without which water would carry away heat or it would be uncomfortable
A. wet suit
B. dry suit
C. skin suit
A. wet suit
which type of exposure suit requires special training?
A. wet suit
B. dry suit
C. skin suit
B. dry suit
a hood is important when diving in water cooler than approximately 21 degrees C/70 degrees F
true/false
true
it's a hot sunny day but my buddy and I are diving in water that is 21 degrees C/70 degrees F. I'm diving in a dry suit and my buddy is diving in a full wet suit. both of us will wear hoods. in this situation \_\_\_\_ is likely an issue we need to avoid before the dive A. improper weighting B. hypothermia C. hand protection D. overheating
D. overheating
the primary reason I carry a cutting tool is to defend myself against sharks and other aquatic animals
true/false
false
you carry a cutting tool for safety and convenience
which cutting tool is a bladed hook for cutting fishing line or net? A. dive knife B. dive tool C. dive shears D. z-knife
D. z-knife
I should wear at least my cutting tool A. on my wrist B. under my BCD hose C. where either hand can reach it D. on my body's lower half
C. where either hand can reach it
I need a dive gear bag to carry my equipment in a bag specifically designed to survive the stresses of diving
true/false
true
when choosing a gear bag, I should choose one ____ for the gear I have
A. slightly larger than what I need
B. just large enough
A. slightly larger than what I need
of the following instruments, which three are primary instruments that I would normally have while diving?
A. dive watch, compass, dive computer
B. dive computer, depth gauge, dive watch
C. thermometer, compass SPG
D. SPG, dive computer, compass
D. SPG, dive computer, compass
if I am using dive tables instead of a dive computer, I will need a dive timer and depth gauge
true/false
true
it’s a sunny day and I’m on a dive bat with no shade. it would be a god idea to cover my gear, including instruments, with a towel
true/false
true
