SDI CERTIFICATION EXAM ( ACTUAL EXAM )
WITH CORRECT ACTUAL QUESTIONS AND
CORRECTLY WELL DEFINED ANSWERS
LATEST 2025 ALREADY GRADED A+
what should you do if you feel ill or nauseated underwater?
ascend immediately
what are bright red lips and fingernails a sign of?
carbon monoxide poisoning
purpose of masks
to create a pocket of air around the eyes to allow them to focus
why do masks have to cover the nose?
to allow the diver to equalize that airspace
what are snorkels used for?
, it allows the diver to look into the water on long surface swims without using any
air
what are fins designed to do and why are they needed
increase the surface area of the feet so that swimming is efficient enough to
overcome the drag of equipment
What should be done with gear after a dive?
a thorough rinse with fresh water, allowing it to dry fully, and storing in a cool, dry
place away from direct sunlight
How much faster is water conducted away underwater than in the air?
25x as fast
What is the barrier between temperature layers of water called?
thermoclines
How much denser is water than air?
800x
Tides can affect
depth, current, and visibility
WITH CORRECT ACTUAL QUESTIONS AND
CORRECTLY WELL DEFINED ANSWERS
LATEST 2025 ALREADY GRADED A+
what should you do if you feel ill or nauseated underwater?
ascend immediately
what are bright red lips and fingernails a sign of?
carbon monoxide poisoning
purpose of masks
to create a pocket of air around the eyes to allow them to focus
why do masks have to cover the nose?
to allow the diver to equalize that airspace
what are snorkels used for?
, it allows the diver to look into the water on long surface swims without using any
air
what are fins designed to do and why are they needed
increase the surface area of the feet so that swimming is efficient enough to
overcome the drag of equipment
What should be done with gear after a dive?
a thorough rinse with fresh water, allowing it to dry fully, and storing in a cool, dry
place away from direct sunlight
How much faster is water conducted away underwater than in the air?
25x as fast
What is the barrier between temperature layers of water called?
thermoclines
How much denser is water than air?
800x
Tides can affect
depth, current, and visibility
