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71 Cards in this Set
- Front
- Back
An object is neutrally buoyant when it
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neither sinks nor floats |
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An object that does not sink or float in fresh water will probably ____ in salt water |
float
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A diver is 20 meters/66 feet underwater. The water pressure at this depth would be ___ times greater than the pressure at the surface |
three |
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I hold a glass upside down at the bottom of a swimming pool; I fill it completely with air from my scuba cylinder and then take it to the surface without tipping it. As I ascend (go up), the air in the glass will |
expand (air molecules will move further apart) |
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What can happen if I do not follow the most important rule in scuba diving? |
my lungs can over-expand, which could cause serious injury |
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What should I do if I have pain in one or both ears while I am descending (going down)? |
Ascend until the soreness or pain goes away; if I can't equalize, do not continue the dive |
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I put air into a balloon at 10 meters/33 feet and then take it to the surface. The balloon will |
expand to twice the size it was at 10 meters/33 feet |
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I want to look after all of my scuba equipment. One way to help prevent the inside of my cylinder from corroding is to |
never let it empty completely |
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when rinsing a regulator, do not |
press the purge button if it is not attached to a cylinder with the air turned on |
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What is the main reason I can't use swimmer's goggles for scuba diving? |
D. I can't equalize goggles |
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When I look at objects through water and through a mask, they seem |
larger |
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____ travels fast underwater and I may have difficulty telling where it came from |
sound |
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If I get cold while scuba diving and I can't stop shivering (shaking), what should I do? |
stop diving immediately, get out of the water, dry off and change into something warm |
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Being properly weighted, attaching hoses and gauges out of the way so I am streamlined and moving slowly and steadily |
is the best way to move underwater |
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Wet suits keep me warm as long as the water is trapped between my skin and the suit. To cut down on the water moving in and out of my wet suit I should |
wear a suit that fits properly |
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Proper airway control allows me to |
breathe past small amounts of water that may be in the snorkel or regulator |
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While swimming against the current at the surface, I begin to feel fatigue, anxiety and weakness, and my breathing becomes labored. These are symptoms of |
overexertion |
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My buddy and I should conduct the predate safety check |
after gearing up, but before entering the water |
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When I practice the buddy system, my buddy and I will |
make predive safety checks |
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Making a safety stop at the end of a dive helps me |
stabilize my ascent rate and gives my body tissues extra time to release |
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For the most part, how far I can see underwater is determined by sunlight and _____ |
suspended particles (floating silt) in the water |
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Without a reference line, compass or depth gauge I am most likely to become disoriented on my dive |
in midwater |
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I am diving from a boat and I am caught in a strong current at the surface and can't get back to the boat. I should |
float at the surface (become positively buoyant) and signal for help |
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I am more likely to be injured by an aquatic animal if I |
touch animals, even if they look harmless |
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Dive environments differ from each other. It is recommended that when I dive in a new or unfamiliar location that I |
get an area orientation |
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I am helping a diver who is struggling at the surface. I should begin by |
establishing buoyancy for myself and the diver |
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A non breathing diver at the surface requires immediate |
rescue breaths |
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If I have a problem at the surface I should |
make myself float right away |
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If available, give ____ to a diver who is breathing but unresponsive |
oxygen |
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If I feel ill before a dive, I should |
cancel the dive |
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To reduce the risk of contaminated air (bad air) problems, I should have my cylinders |
filled only by a reputable dive center |
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T or F Your dive log should contain information that will make planning subsequent dives easier |
TRUE |
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bubbles blocking blood circulation (flow) in my body after a dive are caused by |
excess nitrogen gas coming out of solution |
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Common signs and symptoms of decompression sickness (DCS) include |
pain, weakness, and inability to move arms and/or legs |
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When using a dive computer, I should not ascend any faster than |
the rate specified by my computer |
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To avoid oxygen toxicity when diving with air, I should |
not exceed the maximum depth for recreational diving |
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to plan a dive with a computer, I typically start by |
activating the no stop scroll mode |
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When diving with a computer |
each diver needs an individual computer |
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Before I do anything else with my dive computer, I should |
read the manufacturer's instructions |
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buoyant emergency ascent- dropping my weight system |
When my buddy is too far away and I'm deeper than 9 meters/30 feet |
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buoyant emergency ascent - dropping my weight system |
When my buddy is too far away |
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controlled emergency swimming ascent (CESA) - swimming up to the surface making a continuous sound (like ahhhh) |
When I am low on air and not out of air |
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normal ascent - going up normally |
When my buddy is near |
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As I descend, I need to equalize air spaces. Which of the following are accepted ways of 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 of time |
a & b |
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during a descent, I try to equalize, but discover I am having trouble doing so. What should I do? |
Stop my descent, signal my buddy, ascend slightly and try again |
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I should equalize |
early and often, before I feel discomfort |
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T or F I should not dive with a cold, nor use medications to dive with a cold |
True |
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the most important rule in scuba diving is |
breathe continuously and never hold my breath |
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T or F 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
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True |
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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 |
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My buddy and I are planning a dive to 18 meters/60 feet. We would expect our air supply to last ____ at 10 meters/33 feet, all else being the same |
shorter than |
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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 |
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T or F The 3 overall benefits of the buddy system are practicality, safely, & fun |
True |
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The primary considerations when choosing my scuba gear are: |
suitability, fit, & comfort |
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I'm planning to dive the following week and am checking my gear. I put my kit together and notice that my regulator seems to breathe harder than I remember. The appropriate action would be to: |
Have it inspected and serviced as needed by a professional before using it |
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T or F there is no way to use a DIN regulator on a yoke cylinder valve |
false
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T or F 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 |
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While underwater, I want to move efficiently by |
being streamlined, swimming slowly & steadily, and maintaining proper trim |
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If I am with one buddy, but can't see the other, What should I do? |
This is a buddy separation. Stay with the remaining buddy and search for no more than a minute, then reunite on the surface |
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My buddy and I are planning a shore dive. We are descending onto a very gradual slope that begins at 5 meters/15 feet, so our descent and ascent will be a gradual part of swimming out and back underwater. We have similar cylinders filled to 200bar/3000 psi. We plan: - 50 bar/500 psi reserve - 20 bar/300 psi for our safety stop - to turn the dive when we've used 1/3rd of the air available to use on the dive This means we should head back when either of our SPG's read |
157 bar/2270 psi |
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S.O.R.T.D. |
Signal Orient Regulator Time Descend |
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My buddies and I are wearing wet suits for exposure protection. As I descend, my buoyancy will ____, so I should ____ to control my buoyancy |
decrease, add air frequently to my BCD in small amounts |
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I should never descend or ascend without a reference that I can follow or make contact with |
false |
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While boat diving, my buddy and I finish our safety stop and ascend to the surface. When I reach the surface, I should |
inflate my BCD, switch to my snorkel & signal okay to the divemaster |
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One way to avoid disorientation while descending and ascending is to |
follow a reference |
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My buddy and I are diving from a boat and there's a mild current. In most circumstances, we would ____ for the first part of the dive |
swim into a current |
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My buddy and I accidentally find ourselves in a rip current. There are no special, local procedures so we should |
inflate our BCD's and swimming parallel to shore |
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T or F Depending upon my location, tides can cause significant changes to depth, currents and visibility, or they may have hardly any effect |
True |
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T or F I should stay well away from the boat propeller at all times, even when the engine isn't running |
true |
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On a dive at 10 meters/30 feet, I fail to watch my sPG and run out of air. My buddy is 12 meters/40 feet away and has an alternate second stage. My best option is to probably |
make a controlled emergency swimming ascent |
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** Knowledge Review 4 |
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