SSI open water Exam Questions and
Answers Graded A+
How much does air weigh per liter? - Correct answer-1.29 g
How much does fresh water weigh per liter? - Correct answer-1.0 kg
how much does salt water weigh per liter? - Correct answer-1.025 kg
what does SCUBA stand for? - Correct answer-Self contained underwater
breathing apparatus
Absolute pressure (ambient pressure) - Correct answer-the total pressure exerted on
an object; 1 atmosphere exerted by air above the surface + additional pressure by
water at depth.
gauge pressure - Correct answer-the pressure readings on gauges (absolute minus
one)
Boyle's Law - Correct answer-pressure and volume are inversely proportional
Where does the greatest relative volume change take place? - Correct answer-
between 0 and 10 meters
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,what are the 5 largest air spaces in you body? - Correct answer-ears, sinuses, lungs,
teeth, and intestines
What are the three ways to equalize your ears? - Correct answer-swallowing,
rotating the jaw, Valsalva technique
Where do you lose most of your body heat? - Correct answer-head, torso,
underarms, and groin
how does refraction alter images underwater? - Correct answer-33% larger
25% closer
What is absorption - Correct answer-colors diminish in intensity and virtually
disappear until you can see only blues and purples
What are thermoclines - Correct answer-layers of different temperatures in water
due to the higher density of cold water
how much faster can you lose body heat underwater compared to air? - Correct
answer-25-30x
How is sound different underwater? - Correct answer-4x faster, seems to come
from all directions, travels greater distances underwater
safety stop signal - Correct answer-hand flat horizontally, three fingers pointing
into it
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, how much air signal - Correct answer-hand facing out, two fingers placed on palm
half air signal - Correct answer-hand horizontal, other hand vertical into middle of
it (looks like a time out)
equalize signal - Correct answer-motion of holing nose on mask
low on air signal - Correct answer-outward facing fist
out of air signal - Correct answer-slice throat motion
share air signal - Correct answer-touch regulator
ok out of water signal - Correct answer-arching arm with fist on head
ears not clearing signal - Correct answer-point at ears
something is wrong signal - Correct answer-hand in front of chest moving in
circular motion
get with buddy signal - Correct answer-both hands have pointer finger sticking out,
next to each other, facing down
Sinus squeeze can be prevented by: - Correct answer-not diving with a cold
underwater, the bending of light rays causes objects to appear to be: - Correct
answer-closer
©COPYRIGHT 2025, ALL RIGHTS RESERVED 3
Answers Graded A+
How much does air weigh per liter? - Correct answer-1.29 g
How much does fresh water weigh per liter? - Correct answer-1.0 kg
how much does salt water weigh per liter? - Correct answer-1.025 kg
what does SCUBA stand for? - Correct answer-Self contained underwater
breathing apparatus
Absolute pressure (ambient pressure) - Correct answer-the total pressure exerted on
an object; 1 atmosphere exerted by air above the surface + additional pressure by
water at depth.
gauge pressure - Correct answer-the pressure readings on gauges (absolute minus
one)
Boyle's Law - Correct answer-pressure and volume are inversely proportional
Where does the greatest relative volume change take place? - Correct answer-
between 0 and 10 meters
©COPYRIGHT 2025, ALL RIGHTS RESERVED 1
,what are the 5 largest air spaces in you body? - Correct answer-ears, sinuses, lungs,
teeth, and intestines
What are the three ways to equalize your ears? - Correct answer-swallowing,
rotating the jaw, Valsalva technique
Where do you lose most of your body heat? - Correct answer-head, torso,
underarms, and groin
how does refraction alter images underwater? - Correct answer-33% larger
25% closer
What is absorption - Correct answer-colors diminish in intensity and virtually
disappear until you can see only blues and purples
What are thermoclines - Correct answer-layers of different temperatures in water
due to the higher density of cold water
how much faster can you lose body heat underwater compared to air? - Correct
answer-25-30x
How is sound different underwater? - Correct answer-4x faster, seems to come
from all directions, travels greater distances underwater
safety stop signal - Correct answer-hand flat horizontally, three fingers pointing
into it
©COPYRIGHT 2025, ALL RIGHTS RESERVED 2
, how much air signal - Correct answer-hand facing out, two fingers placed on palm
half air signal - Correct answer-hand horizontal, other hand vertical into middle of
it (looks like a time out)
equalize signal - Correct answer-motion of holing nose on mask
low on air signal - Correct answer-outward facing fist
out of air signal - Correct answer-slice throat motion
share air signal - Correct answer-touch regulator
ok out of water signal - Correct answer-arching arm with fist on head
ears not clearing signal - Correct answer-point at ears
something is wrong signal - Correct answer-hand in front of chest moving in
circular motion
get with buddy signal - Correct answer-both hands have pointer finger sticking out,
next to each other, facing down
Sinus squeeze can be prevented by: - Correct answer-not diving with a cold
underwater, the bending of light rays causes objects to appear to be: - Correct
answer-closer
©COPYRIGHT 2025, ALL RIGHTS RESERVED 3
