Scuba AFS 270 SDI Midterm|143 Comprehensive Questions With Answers|2025
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Course
Scuba AFS 270 SDI
Institution
Scuba AFS 270 SDI
Surface, under water - ️️If you and your buddy follow the same plan for dealing with buddy separation, you will end up meeting either on the _________ or ________ ___________.
1: Surface, dive boat
2: Shore, dive boat
3: Surface, under water
4: Boat, under water
The weaker buddy. - ️️W...
Surface, under water - ✔ ✔ If you and your buddy follow the
same plan for dealing with buddy separation, you will end up
meeting either on the _________ or ________ ___________.
1: Surface, dive boat
2: Shore, dive boat
3: Surface, under water
4: Boat, under water
The weaker buddy. - ✔ ✔ Which member of the buddy team
determines the pace for the dive?
1: It doesn't matter, so long as both buddies agree.
2: The stronger buddy.
3: The weaker buddy.
4: None of the above.
When attempting to recover your primary second stage
underwater, it is acceptable to switch to your alternate air source
while you search for your primary.
true (aquatic life injuries) - ✔ ✔ T/F
,Most aquatic life injuries amount to no more than a temporary, yet
painful, sting or abrasion.
true (buoyant) - ✔ ✔ T/F
Depending on circumstances, there are times when divers may
wish to be positively, negatively or neutrally buoyant.
True (decompression sickness) - ✔ ✔ TRUE or FALSE:
Treatment for decompression sickness may require
recompression in a hyperbaric chamber.
You must be exhaling continuously any time you cannot inhale. -
✔ ✔ To minimize the risk of a lung overpressure injury during
an independent emergency ascent:
1: You must exhale completely prior to beginning your ascent.
2: You must make at least three attempts at inhaling during your
ascent.
3: You must be exhaling continuously any time you cannot inhale.
4: You must spit out your regulator at the beginning of the ascent.
(1) You can help prevent mask squeeze by exhaling periodically
into your mask during ascent. - ✔ ✔ All of the following are
true except:
1: You can help prevent mask squeeze by exhaling periodically into
your mask during ascent.
,2: Regular dental care and ensuring your teeth are free of gas
spaces can help prevent tooth squeeze.
3: If you experience a reverse block, descend to a point where the
pain subsides, then ascend slowly while wiggling your jaw and
swallowing. Repeat this process as needed until you can ascend
without pain or discomfort.
4: The danger in taking decongestants is that they may wear off
during a dive and have other possible side effects.
(2) Ascend to the point where you can comfortably equalize, and
only then continue your descent. - ✔ ✔ If you feel pain or
discomfort during descent:
1: Stop, hold in place and equalize forcefully until your ears clear.
2: Ascend to the point where you can comfortably equalize, and
only then continue your descent.
3: Abort the dive and consult a physician.
4: Note the depth at which the pain occurred and conduct your
safety stop there at the end of the dive.
(2) Breathe continuously; never hold your breath. - ✔ ✔ The
single most important rule of scuba diving is:
1: Equalize early and often.
2: Breathe continuously; never hold your breath.
, 3: Never descend head first.
4: None of the above.
(2) Hydrostatically tested and visually inspected at intervals
determined by local laws and regulations, or prevailing standards
of practice. - ✔ ✔ Scuba cylinders must be:
1: Hydrostatically tested every four years and visually inspected
every six months.
2: Hydrostatically tested and visually inspected at intervals
determined by local laws and regulations, or prevailing standards
of practice.
3: Hydrostatically tested every year and visually inspected every
five years.
4: None of the above.
(2) The elevated partial pressure of nitrogen divers experience at
depth. - ✔ ✔ The chief cause of nitrogen narcosis is:
1: Diving past 40 m/132 ft.
2: The elevated partial pressure of nitrogen divers experience at
depth.
3: The combination of carbon dioxide and nitrogen at depth.
4: None of the above.
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