PADI OPEN WATER DIVER MAIN CORE EXAMINATION
QUESTIONS AND ANSWERS FIRM A+
✔✔release dissolved gases - ✔✔what does a safety stop give you extra time to do?
✔✔dry suits - ✔✔provide the most insulation;
have watertight zippers and seals, and most types cover your entire body;
better for cooler water dives
✔✔skin suits (body suits) - ✔✔provide little or no insulation;
mainly to protect you from minor cuts, scrapes, stings, and sunburn
✔✔dive knife, dive tool, shears, z-knives - ✔✔4 types of cursing tools
✔✔water movement, weather, plankton, and bottom composure - ✔✔four factors that
affect visibility
✔✔dive within limits - ✔✔you do not exceed the limits of your training and/or experience
✔✔passive interactions - ✔✔those that leave aquatic life undisturbed
✔✔active interactions - ✔✔those that affect aquatic life directly, by altering their normal
behaviors: feeding, hunting, touching, moving, chasing, scaring, etc.
✔✔project AWARE - ✔✔movement of scuba divers protecting our ocean planet
✔✔surf zone - ✔✔the area in which waves break
✔✔surge - ✔✔a back-and-forth motion caused by waves passing overhead
✔✔undertow (backrush) - ✔✔the water of breaking waves flowing back to sea under
incoming waves
✔✔rip currents - ✔✔result when waves push water over a long obstruction (such as a
reef or sandbar); and funnels back to sea through an available opening
✔✔upwelling - ✔✔wind blowing from shore can push surface water away, causing
cooler, deeper water to rise toward the surface to replace it
✔✔tides - ✔✔result from the moon and sun's gravity pulling on the water of the oceans
✔✔in control - ✔✔not panicking
✔✔out of control - ✔✔panicking
, ✔✔surface signaling devices - ✔✔whistles, low-pressure horns, inflatable signal tubes,
delayed surface marker buoys, signal mirrors, signal lights
✔✔traditional dive flag - ✔✔indicates that there are divers below and boats should keep
clear
✔✔alpha flag - ✔✔indicates that the vessel flying it has divers in the water and can't
maneuver
✔✔mesh utility bag - ✔✔holding litter, transporting gear to and from boat, carrying small
items
✔✔slate - ✔✔a piece of rigid plastic upon which you rite with an attached pencil or
marker; reusable
✔✔wet book - ✔✔compact notebook with waterproof pages the you also write with an
attached pencil
✔✔dive planning software - ✔✔estimates how long your air supply will last on a dive
and also tells you the estimated time your dive computer will allow on a dive, based on
how much nitrogen your body has absorbed
✔✔alcohol and tobacco - ✔✔two common substances i should refrain from using before
diving, as they accelerate heat loss
✔✔lung overexpansion - ✔✔smoking raises the risk for....
✔✔79% nitrogen and 21% oxygen - ✔✔what components make up air
✔✔enriched nitrogen air - ✔✔has the same components as normal air, but with 22% or
more of oxygen
✔✔toxic - ✔✔breathing more than 21% oxygen can be _______
✔✔give emergency oxygen - ✔✔if a diver is suspected to be breathing contaminated
air, you should ________ ____________ _________
✔✔depth and time - ✔✔two primary factors that influence how much nitrogen you
absorb during a dive
✔✔decompression sickness - ✔✔when you ascend without taking safety stops, you
may have too much nitrogen in your body which can cause nitrogen bubbles to form
within your blood and body tissues
QUESTIONS AND ANSWERS FIRM A+
✔✔release dissolved gases - ✔✔what does a safety stop give you extra time to do?
✔✔dry suits - ✔✔provide the most insulation;
have watertight zippers and seals, and most types cover your entire body;
better for cooler water dives
✔✔skin suits (body suits) - ✔✔provide little or no insulation;
mainly to protect you from minor cuts, scrapes, stings, and sunburn
✔✔dive knife, dive tool, shears, z-knives - ✔✔4 types of cursing tools
✔✔water movement, weather, plankton, and bottom composure - ✔✔four factors that
affect visibility
✔✔dive within limits - ✔✔you do not exceed the limits of your training and/or experience
✔✔passive interactions - ✔✔those that leave aquatic life undisturbed
✔✔active interactions - ✔✔those that affect aquatic life directly, by altering their normal
behaviors: feeding, hunting, touching, moving, chasing, scaring, etc.
✔✔project AWARE - ✔✔movement of scuba divers protecting our ocean planet
✔✔surf zone - ✔✔the area in which waves break
✔✔surge - ✔✔a back-and-forth motion caused by waves passing overhead
✔✔undertow (backrush) - ✔✔the water of breaking waves flowing back to sea under
incoming waves
✔✔rip currents - ✔✔result when waves push water over a long obstruction (such as a
reef or sandbar); and funnels back to sea through an available opening
✔✔upwelling - ✔✔wind blowing from shore can push surface water away, causing
cooler, deeper water to rise toward the surface to replace it
✔✔tides - ✔✔result from the moon and sun's gravity pulling on the water of the oceans
✔✔in control - ✔✔not panicking
✔✔out of control - ✔✔panicking
, ✔✔surface signaling devices - ✔✔whistles, low-pressure horns, inflatable signal tubes,
delayed surface marker buoys, signal mirrors, signal lights
✔✔traditional dive flag - ✔✔indicates that there are divers below and boats should keep
clear
✔✔alpha flag - ✔✔indicates that the vessel flying it has divers in the water and can't
maneuver
✔✔mesh utility bag - ✔✔holding litter, transporting gear to and from boat, carrying small
items
✔✔slate - ✔✔a piece of rigid plastic upon which you rite with an attached pencil or
marker; reusable
✔✔wet book - ✔✔compact notebook with waterproof pages the you also write with an
attached pencil
✔✔dive planning software - ✔✔estimates how long your air supply will last on a dive
and also tells you the estimated time your dive computer will allow on a dive, based on
how much nitrogen your body has absorbed
✔✔alcohol and tobacco - ✔✔two common substances i should refrain from using before
diving, as they accelerate heat loss
✔✔lung overexpansion - ✔✔smoking raises the risk for....
✔✔79% nitrogen and 21% oxygen - ✔✔what components make up air
✔✔enriched nitrogen air - ✔✔has the same components as normal air, but with 22% or
more of oxygen
✔✔toxic - ✔✔breathing more than 21% oxygen can be _______
✔✔give emergency oxygen - ✔✔if a diver is suspected to be breathing contaminated
air, you should ________ ____________ _________
✔✔depth and time - ✔✔two primary factors that influence how much nitrogen you
absorb during a dive
✔✔decompression sickness - ✔✔when you ascend without taking safety stops, you
may have too much nitrogen in your body which can cause nitrogen bubbles to form
within your blood and body tissues
