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SDI Certification Exam Review questions and answers
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SDI Certification Exam ReviewAs pressure increases - correct answer-Volume decreases
Cylinders should be visually inspected ____ a year and hydrostatically tested every ____
years - correct answer-Once; five
Define no-stop time - correct answer-Amount of time remaining at any point during the dive
before a necessary decompression stop
Define risk management - correct answer-Way of preventing problems and planning a
response to any emergency
Describe the function of regulator first stage and second stage - correct answer-First stage -
attaches to tank valve and reduces the high-pressure air to intermediate pressure
Second stage - delivers air at ambient pressure directly to the diver
Describe the symptoms of DCS - correct answer-Rash from bubbles in skin capillaries, joint
pain, difficulty inhaling, loss of sensation, paralysis, could be fatal
Describe two important features of a weight system - correct answer-Quick release
mechanism, evenly-dispersed lead
Global currents are _____.
Local currents ____. - correct answer-Fixed
Fluctuate
How do you conduct a safety stop? - correct answer-Conducted at 15 ft for 3-5 minutes
before surfacing
How do you determine a time limit a repetitive dive from a PDC? - correct answer-Surface
mode shows depths ranging every ten feet with the no-stop time limits adjusted for current
depth
How do you know if your mask fits correctly? - correct answer-Will tighten to your face and
won't fall off via suction through your nose
How do you treat a sting? - correct answer-Hot water or vinegar
How many times more dense is air in a balloon at 4 atm compared to the air density at the
surface? - correct answer-4 times
How much air should remain in your cylinder upon completing a dive? - correct answer-500
psi
, How much faster does sound move through water than air and why? - correct answer-4
times faster in water
Water is 800x denser than air; sound travels through denser mediums at faster rates
How much larger and closer do objects appear under water and why? - correct answer-33%
larger, 25% closer
Light bends in the air-space between the lens and your eyes.
How often should you equalize during descent? - correct answer-Early and often; at the
surface and then every couple feet so no discomfort is felt
How to do alleviate the symptoms of nitrogen narcosis? - correct answer-Ascend normally
until you no longer feel effects
How to treat a diver with decompression sickness - correct answer-Bring diver to surface,
seek immediate medical attention, administer pure oxygen, place person in pressure
chamber
If a scuba cylinder lasts two hours at sea level, how long will it last at 20 m/66 ft? - correct
answer-40 min
If you are caught in a rip current, first swim _____ to the current to get out of it before
swimming towards shore. - correct answer-Perpendicular
Injuries due to marine life typically a _____ response - correct answer-Defense
List five factors that can predispose a diver to decompression sickenss - correct
answer-Illness, ascending too fast, dehydration, smoking, alcohol consumption
List the four functions of a dive computer - correct answer-Depth, dive time, ascent rate,
surface interval time
List the three important scuba diving changes that occurred in the 1950s - correct answer-1)
Dive tables published for repetitive dives
2) Improved design/quality of scuba gear
3) Dive computers commercially available
List three different reasons that it is advisable to check with your local dive center before
diving in an unfamiliar area. - correct answer-1) Rip currents could be prevalent
2) Thermoclines could affect thermal protection
3) YOU ARE SUBJECT TO LOCALITY (be aware of laws and regulations
List two feelings of being "narked" - correct answer-Euphoric, anxious
Long shore current - correct answer-Flows parallel to shore
Name one audible and one visual rescue signal device - correct answer-Whistle/horn
Bright-colored lift bag
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