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Scuba AFS 270 SDI Midterm Exam Updated
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Scuba AFS 270 SDI Midterm Exam Updated
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Scuba AFS 270 SDI Midterm Exam Updated(1) You can help prevent mask squeeze by exhaling periodically into your mask during
ascent. - ANSWER-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. - ANSWER-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. - ANSWER-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. - ANSWER-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. - ANSWER-
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.
,(3) A wave encountering shallow water begins to slow at its bottom, while the top of the
wave continues at its previous speed. This causes the wave to break. - ANSWER-
Which of the following best describes the formation of surf?
1: Waves energy, rebounding from its impact with shore, crashes into oncoming waves,
causing them to break.
2: Entering shallow water forces wave energy upward, making the wave crest unstable
and causing it to break.
3: A wave encountering shallow water begins to slow at its bottom, while the top of the
wave continues at its previous speed. This causes the wave to break.
4: As waves enter shallow water, the distance between wave crests (wave length)
shortens, increasing the tendency to break.
(3) Air permitting, make the decompression stop indicated by your dive computer.
Afterward, monitor for signs and symptoms of decompression sickness. - ANSWER-
Should you accidentally exceed your dive computer's no-decompression limit.
1: Stop for two minutes at 6 m/20 ft and five minutes at 3 m/10 ft.
2: Ascend immediately, begin breathing pure oxygen and contact the Divers Alert
Network (DAN).
3: Air permitting, make the decompression stop indicated by your dive computer.
Afterward, monitor for signs and symptoms of decompression sickness.
4: None of the above.
(3) Avoid drinking fluids prior to the dive. - ANSWER-All of the following can help
prevent decompression sickness (DCS) except:
1: Make a safety stop of between three and five minutes at a depth of 3-6 m/10-20 ft.
2: Remain well within your dive computer's no-decompression limit.
3: Avoid drinking fluids prior to the dive.
4: Ascend no faster than the rate allowed by the dive computer
(3) Create an air space in front of the eyes, enabling them to focus. - ANSWER-The
primary function of a mask is to:
1: Magnify the appearance of objects under water.
2: Cover the nose, to prevent water from entering.
3: Create an air space in front of the eyes, enabling them to focus.
4: None of the above.
(3) Take several deep breaths from your regulator while watching your SPG for changes
in pressure. - ANSWER-After your buddy checks to see that your air is turned all the
way on:
1: You are ready to enter.
2: Reach back and double check it yourself.
3: Take several deep breaths from your regulator while watching your SPG for changes
in pressure.
4: None of the above.
, (4) all of the above - ANSWER-Among the most important features to look for when
selecting fins are:
1: Comfort and fit.
2: Blade size proportional to leg strength.
3: Suitability for the type of diving you do.
4: All of the above.
(4) All of the above - ANSWER-Not allowing alternate-air-source second stages,
instrument consoles and other equipment to dangle freely:
1: Helps reduce the risk of entanglement.
2: Helps protect fragile aquatic life.
3: Helps protect equipment from damage.
4: All of the above.
(4) Both the first and third answers are correct. - ANSWER-Activities that may increase
the risk of decompression sickness include:
1: Alcohol use.
2: Computer use.
3: Drug use.
4: Both the first and third answers are correct.
1: Grasp the fin tip of the affected leg and pull towards you while straightening the leg.
This stretches the calf muscle. - ANSWER-Which of the following is among the most
effective means of relieving a leg cramp once it has occurred?
1: Grasp the fin tip of the affected leg and pull towards you while straightening the leg.
This stretches the calf muscle.
2: Change to a different style of kick.
3: Have a buddy tow you back to the boat or shore.
4: None of the above.
1: Natural navigation. - ANSWER-The most commonly used method of finding your way
under water is:
1: Natural navigation.
2: Computer navigation.
3: Compass navigation.
4: None of the above.
1: Pull out slightly at the base of the mask to create a space for water to exit. -
ANSWER-Which of the following is not true? When Clearing a mask, you should:
1: Pull out slightly at the base of the mask to create a space for water to exit.
2: Inhale through your mouth, but exhale through your nose.
3: Take as many breaths as needed to clear the mask completely.
4: Look up during the last exhalation to make the bottom of the mask skirt the lowest
point.
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