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SDI Certification Exam Review Graded A+
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SDI Certification Exam Review Graded A+
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SDI Certification Exam Review Graded A+As pressure increases - ANSWER-Volume decreases
Cylinders should be visually inspected ____ a year and hydrostatically tested every
____ years - ANSWER-Once; five
Define no-stop time - ANSWER-Amount of time remaining at any point during the dive
before a necessary decompression stop
Define risk management - ANSWER-Way of preventing problems and planning a
response to any emergency
Describe the function of regulator first stage and second stage - 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 - 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 - ANSWER-Quick release
mechanism, evenly-dispersed lead
Global currents are _____.
Local currents ____. - ANSWER-Fixed
Fluctuate
How do you conduct a safety stop? - ANSWER-Conducted at 15 ft for 3-5 minutes
before surfacing
How do you determine a time limit a repetitive dive from a PDC? - 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? - ANSWER-Will tighten to your face and
won't fall off via suction through your nose
How do you treat a sting? - 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? - ANSWER-4 times
How much air should remain in your cylinder upon completing a dive? - ANSWER-500
psi
, How much faster does sound move through water than air and why? - 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? - ANSWER-33%
larger, 25% closer
Light bends in the air-space between the lens and your eyes.
How often should you equalize during descent? - 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? - ANSWER-Ascend normally
until you no longer feel effects
How to treat a diver with decompression sickness - 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? -
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. - ANSWER-Perpendicular
Injuries due to marine life typically a _____ response - ANSWER-Defense
List five factors that can predispose a diver to decompression sickenss - ANSWER-
Illness, ascending too fast, dehydration, smoking, alcohol consumption
List the four functions of a dive computer - ANSWER-Depth, dive time, ascent rate,
surface interval time
List the three important scuba diving changes that occurred in the 1950s - 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. - 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" - ANSWER-Euphoric, anxious
Long shore current - ANSWER-Flows parallel to shore
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