Name 3 different devices that modern dive computers replace
- Correct Answer - 1) dive tables
2) J-valves
3) depth gauges
What sets SDI apart from other training agencies?
- Correct Answer - First dive training agency to provide entry level
scuba instruction that incorporates the use of personal dive
computers --> more streamlined scuba course w/ more instruction
time in the water
How much larger and closer do objects appear underwater and
why?
- Correct Answer - Objects underwater appear 25% larger and
25% closer
,As light travels through the airspace created by the mask, it
bends, creating a magnifying effect.
How much faster does sound move through water than air and
why?
- Correct Answer - 4 times faster because water is about 800
times denser than air.
What is the first color to be absorbed underwater?
- Correct Answer - Red (within first 25 feet)
When diving from shore, the best time to dive is when there is the
least amount of tidal current. _______ tide is when there is no
horizontal water movement.
- Correct Answer - Slack tide
If you are caught in a rip current, first swim _____ to the current to
get out of it before swimming towards shore.
- Correct Answer - Parallel
Waves are usually caused by
- Correct Answer - Wind pushing water on the surface
, T or F: Anticipate surge action to avoid contact with stationary
objects
- Correct Answer - True
What type of marine life cause most diving injuries?
- Correct Answer - Most diving injuries result from animal's
defensive response to a perceived threat
What should you do if you see a potentially dangerous animal
underwater and it does not leave the area?
- Correct Answer - Remain still and calm. Slowly leave area if
necessary.
List three different reasons that it is advisable to check with your
local dive center before conducting a dive in an area you are
unfamiliar with?
- Correct Answer - 1) tidal conditions
2) marine life
3) first aid for potential injuries in area
What is the absolute pressure (in atm/bar) at 20 meters (66 feet)?
- Correct Answer - 3 atm/bar
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