SDI Exam Questions With Accurate Answers 2024-2025
Objects underwater appear: - Answer Closer and larger than they do on land
What happen to colours underwater - Answer As you go deeper colours appear to fade,
not become more intense. Blues and grays are the last remaining colors at depth.
Because sound travels faster underwater: - Answer The increased speed sound
underwater makes it harder to determine what direction it is coming from.
Water conducts heat away from your body ___ times faster than air does - Answer 25
The existence of thermoclines implies that - Answer divers may need more in the way of
exposure protection at depth than they will in the surface.
Tides can: - Answer - appear to make water deeper or shallower, stronger and difficult,
an adverse effect on visibility
Cause of permanent ocean currents - Answer The major cause of permanent ocean
currents is the sun warming water near the equator, along with the earth's rotation.
Wave height and length - Answer Wave height is from its highest point called the crest to
its lowest point called the trough. Wave length is from crest to crest.
How does surf form? - Answer A wave reaching shallower water has its bottom drag,
while the top of the wave continues at the same speed. This breaking of a wave is
actually.
what is surge - Answer Surge is the term for any back-and-forth water movement due to
, waves passing over head.
What causes most aquatic animal bites? - Answer Defensive reaction of an animal to a
perceived threat & mistaken identity
To be injured by an animal with poisonous spines, you must: - Answer Be the aggressor
and touch the animal first.
The states of buoyancy include all of the following except: - Answer Passive
If you feel pain or discomfort during descent: - Answer Ascend to the point where you
can comfortably equalize, and only then continue your descent.
Which of the following is the best way to avoid, or minimize nitrogen narcosis? - Answer
If you are scuba diving and cannot breathe in, such as when a regulator is out of your
mouth, you must be - Answer Exhaling.
What can prevent decompression sickness (DCS) - Answer safety stops, Stay well within
your dive computer's no-decompression limit, Make no ascent faster than the rate
permitted by the dive computer
Contributing factors to decompression sickness can include: - Answer Rapid ascents,
'Pushing" or exceed- ing your computer's no-decompression limits, Heavy exertion
and/or dehydration.
best possible way to prevent or reduce nitrogen narcosis? - Answer Avoid dives below
20 meters/66 feet.
Contaminated, possibly toxic air in a scuba cylinder may be indicated by which of the
following? - Answer color, odor, taste
Objects underwater appear: - Answer Closer and larger than they do on land
What happen to colours underwater - Answer As you go deeper colours appear to fade,
not become more intense. Blues and grays are the last remaining colors at depth.
Because sound travels faster underwater: - Answer The increased speed sound
underwater makes it harder to determine what direction it is coming from.
Water conducts heat away from your body ___ times faster than air does - Answer 25
The existence of thermoclines implies that - Answer divers may need more in the way of
exposure protection at depth than they will in the surface.
Tides can: - Answer - appear to make water deeper or shallower, stronger and difficult,
an adverse effect on visibility
Cause of permanent ocean currents - Answer The major cause of permanent ocean
currents is the sun warming water near the equator, along with the earth's rotation.
Wave height and length - Answer Wave height is from its highest point called the crest to
its lowest point called the trough. Wave length is from crest to crest.
How does surf form? - Answer A wave reaching shallower water has its bottom drag,
while the top of the wave continues at the same speed. This breaking of a wave is
actually.
what is surge - Answer Surge is the term for any back-and-forth water movement due to
, waves passing over head.
What causes most aquatic animal bites? - Answer Defensive reaction of an animal to a
perceived threat & mistaken identity
To be injured by an animal with poisonous spines, you must: - Answer Be the aggressor
and touch the animal first.
The states of buoyancy include all of the following except: - Answer Passive
If you feel pain or discomfort during descent: - Answer Ascend to the point where you
can comfortably equalize, and only then continue your descent.
Which of the following is the best way to avoid, or minimize nitrogen narcosis? - Answer
If you are scuba diving and cannot breathe in, such as when a regulator is out of your
mouth, you must be - Answer Exhaling.
What can prevent decompression sickness (DCS) - Answer safety stops, Stay well within
your dive computer's no-decompression limit, Make no ascent faster than the rate
permitted by the dive computer
Contributing factors to decompression sickness can include: - Answer Rapid ascents,
'Pushing" or exceed- ing your computer's no-decompression limits, Heavy exertion
and/or dehydration.
best possible way to prevent or reduce nitrogen narcosis? - Answer Avoid dives below
20 meters/66 feet.
Contaminated, possibly toxic air in a scuba cylinder may be indicated by which of the
following? - Answer color, odor, taste
