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SDI Open Water Test Graded A+
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SDI Open Water Test Graded A+
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SDI Open Water Test Graded A+A cylindar should be visually inspected at least XXX a year and hydrostatically tested
every XXX years in the United States. - ANSWER-1. once a year 2. every five years
A snorkel is a required piece of equipment. What side of the mask does a snorkel
belong on? Why? - ANSWER-The Left Side. Because your regulator goes on the right
side and you don't want the snorkel to get in the way.
A tank is considered out of air on a dive when
(A) The tank is empty
(B) 200 PSI
(C) 500 PSI
(D) 1,000 PSI - ANSWER-(C) 500 PSI
A weight belt should be put on with a XXX hand release. - ANSWER-Right
A. Define Thermocline
B. Give an example - ANSWER-A. A layer of water that separates warmer surface
water from cold deep water.
B. Air temperature could be 85 degrees, Water temperature could be 81 degrees. But
water at the bottom could be 51 degrees.
A. Describe Boyle's Law
B. Why is this important to a diver? - ANSWER-A. If pressure increases, then volume
decreases, and vice versa.
B. Boyle's law can be used to determine the effect of depth on air consumption and it
can be used to prevent diving related injuries.
A. How much faster does sound move underwater than in the air?
B. Why is this important to a diver? - ANSWER-A. Sound moves 4X faster in water than
air due to the density of the water.
B. It's difficult for the diver to tell which direction sound is coming from, or how far away
it is. This can be especially dangerous when you hear a boat overhead.
A. How much larger and closer do items appear underwater?
B. Why is this important to a diver? - ANSWER-A. 33% Larger and 25% Closer
B. Visual distortion may be disorienting to a diver and can cause dizziness.
, A. In Pocatello Idaho (abt 4,000 feet), what is the atmospheric pressure (PSI) on land?
B. How deep would you need to dive to equal 1 atm if diving in Pocatello, ID? -
ANSWER-A. About 12.7 PSI
B. About 26 ft.
A. Water conducts heat away from the body about XXX percent faster than air.
B. Why does this matter to a diver? - ANSWER-A. 25%
B. It's much easier to experience cold related injuries (such as hypothermia) underwater
than on land. Always plan ahead and wear a wetsuit or drysuit as necessary to prevent
injury.
A. Water that contains a large quantity of suspended particles is said to be XXX.
B. Why does this matter to a diver? - ANSWER-A. Turbid
B. Turbid water reduces visibility and poses more danger to a diver than clear water. It
becomes easier to get lost and lose sight of other divers.
A. Waves are usually caused by ______________________.
B. How are waves dangerous to a diver? - ANSWER-A. Wind
B. Waves on the surface cause "surge" underneath. In a strong surge, a diver has little
control over which direction to swim and can be thrown into underwater formations.
A. What types of marine life cause the most diving injuries?
B. What do most marine life diving injuries consist of? - ANSWER-A. Fire Coral, Jelly
Fish, Fish on the sea floor
B. Painful, temporary stings and abraisions
After diving you should always do what with your mask, fins, and snorkel. - ANSWER-
Rinse them well in fresh water to reduce degridation of the materials.
After returning to the surface, before you take the regulator out of your mouth you
should . . . - ANSWER-Add air to the BCD to achieve positive buoyancy
Anytime the regulator leaves your mouth underwater you should . . . - ANSWER-Exhale
Atmospheric pressure is 14.7 PSI at sea level. What is the absolute pressure at a depth
of 33 feet? - ANSWER-29.4 PSI
Define Maximum Dive Depth. - ANSWER-The deepest point reached during a dive
Define No-Stop Time or No-Stop Dive. - ANSWER-A dive during which you can safely
ascend straight to the surface with no decompression stops.
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