SDI FINAL EXAM WITH CORRECT 65 QUESTIONS AND
CORRECTRY ANALYZED ANSWERS (ACTUAL EXAM)
Objects under water appear:
1: The same size as they do on land.
2: Twice as large as they do on land.
3: Closer and larger than they do on land.
4: Smaller and farther away than they do on land. - correct answer..Closer and larger
than they do on land.
As you descend:
1: Colors appear to fade.
2: Reds and oranges are among the first colors to disappear.
3: At 30 m/99 ft, little color remains other than blues, grays, blacks and whites.
4: All of the above. - correct answer..All of the above.
Which of the following statements is true? There may be more than one correct answer.
1: Water is 400 times denser than air.
2: Water is 800 times denser than air.
3: Sound travels about four times faster underwater.
4: Both the second and the third answer are correct. - correct answer..Both the second
and the third answer are correct.
Which of the following is/are true?
1: Water conducts heat away from your body ten times faster than air does.
2: Water conducts heat away from your body 25 times faster than air does.
3: Fresh water conducts heat away from your body faster than salt water does.
4: Salt water conducts heat away from your body faster than fresh water does. - correct
answer..Water conducts heat away from your body 25 times faster than air does.
When water stratifies itself into layers, according to temperature, the boundary between
layers is known as a(n):
1: Halocline.
2: Ichtyocline.
3: Thermodyne.
4: Thermocline. - correct answer..Thermocline.
Which of the following is/are true?
,1: Tides can make the water at a particular dive site noticeably deeper or shallower than
you may have experienced previously.
2: Tidal currents can be very strong, making diving difficult or even dangerous.
3: Strong tidal currents can have an adverse effect on visibility.
4: All of the above. - correct answer..All of the above.
The sun warming water near the equator, coupled with the earth's rotation, is the
primary cause of permanent ocean currents.
1: True.
2: False. - correct answer..True.
Which of the following is/are true?
1: If caught in a rip current, swim directly towards shore, using the most powerful kick
possible.
2: If caught in a rip current, swim perpendicular to shore, until you are completely out of
the rip current, then swim in towards shore.
3: If caught in a rip current, swim parallel to shore, until you are completely out of the rip
current, then swim in towards shore.
4: Don't fight the rip current; relax and let it carry you closer to shore. - correct answer..If
caught in a rip current, swim parallel to shore, until you are completely out of the rip
current, then swim in towards shore.
We measure waves by their height and weight.
1: True.
2: False. - correct answer..False.
Explanation:
We measure waves by their height and length.
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. - correct answer..Only the third answer (A
wave encountering shallow water begins to slow at it bottom, while the top of the wave
continues at its previous speed; this causes the wave to break) is correct.
Surge:
1: Occurs when waves force water between facing rock ledges.
2: Is the back-and-forth movement of water caused by waves passing over head.
3: Is the backwash of water from waves breaking on shore.
, 4: None of the above. - correct answer..Surge is the back-and-forth movement of water
caused by waves passing over head.
Which 'if any' of the following are true?
1: Aquatic animals present a greater risk to divers than any other factor.
2: Most aquatic animal bites result from an animal's defensive response to a perceived
threat or, on rare occasions, from a case of mistaken identify.
3: Because they are perceived as more aggressive, men are more likely to be the victim
of an aquatic animal attack than women are.
4: None of the above. - correct answer..Most aquatic animal bites result from an
animal's defensive response to a perceived threat or, on rare occasions, from a case of
mistaken identify.
Psoriacysts produce toxins that, when touched, can produce symptoms ranging from a
mild rash or sting to anaphylactic shock or even paralysis.
1: True.
2: False. - correct answer..False.
Explanation:
Nematocysts produce toxins that, when touched, can produce symptoms ranging from a
mild rash or sting to anaphylactic shock or even paralysis.
Depending on circumstances, there are times when divers may wish to be positively,
negatively or neutrally buoyant.
1: True.
2: False. - correct answer..True.
A scuba cylinder that normally lasts one hour at the surface will last _______ minutes at
20 meters/66 feet.
1: 30
2: 20
3: 15
4: 10 - correct answer..20
Explanation:
A scuba cylinder that normally lasts one hour at the surface will last 20 minutes at 20
m/66 ft.
Which of the following is not true? Divers should equalize:
1: Preemptively before descent.
2: Well before feeling any pain or discomfort.
3: As soon as they feel any pain or discomfort.
4: Early and often during descent. - correct answer..As soon as they feel any pain or
discomfort.
All of the following are true except:
CORRECTRY ANALYZED ANSWERS (ACTUAL EXAM)
Objects under water appear:
1: The same size as they do on land.
2: Twice as large as they do on land.
3: Closer and larger than they do on land.
4: Smaller and farther away than they do on land. - correct answer..Closer and larger
than they do on land.
As you descend:
1: Colors appear to fade.
2: Reds and oranges are among the first colors to disappear.
3: At 30 m/99 ft, little color remains other than blues, grays, blacks and whites.
4: All of the above. - correct answer..All of the above.
Which of the following statements is true? There may be more than one correct answer.
1: Water is 400 times denser than air.
2: Water is 800 times denser than air.
3: Sound travels about four times faster underwater.
4: Both the second and the third answer are correct. - correct answer..Both the second
and the third answer are correct.
Which of the following is/are true?
1: Water conducts heat away from your body ten times faster than air does.
2: Water conducts heat away from your body 25 times faster than air does.
3: Fresh water conducts heat away from your body faster than salt water does.
4: Salt water conducts heat away from your body faster than fresh water does. - correct
answer..Water conducts heat away from your body 25 times faster than air does.
When water stratifies itself into layers, according to temperature, the boundary between
layers is known as a(n):
1: Halocline.
2: Ichtyocline.
3: Thermodyne.
4: Thermocline. - correct answer..Thermocline.
Which of the following is/are true?
,1: Tides can make the water at a particular dive site noticeably deeper or shallower than
you may have experienced previously.
2: Tidal currents can be very strong, making diving difficult or even dangerous.
3: Strong tidal currents can have an adverse effect on visibility.
4: All of the above. - correct answer..All of the above.
The sun warming water near the equator, coupled with the earth's rotation, is the
primary cause of permanent ocean currents.
1: True.
2: False. - correct answer..True.
Which of the following is/are true?
1: If caught in a rip current, swim directly towards shore, using the most powerful kick
possible.
2: If caught in a rip current, swim perpendicular to shore, until you are completely out of
the rip current, then swim in towards shore.
3: If caught in a rip current, swim parallel to shore, until you are completely out of the rip
current, then swim in towards shore.
4: Don't fight the rip current; relax and let it carry you closer to shore. - correct answer..If
caught in a rip current, swim parallel to shore, until you are completely out of the rip
current, then swim in towards shore.
We measure waves by their height and weight.
1: True.
2: False. - correct answer..False.
Explanation:
We measure waves by their height and length.
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. - correct answer..Only the third answer (A
wave encountering shallow water begins to slow at it bottom, while the top of the wave
continues at its previous speed; this causes the wave to break) is correct.
Surge:
1: Occurs when waves force water between facing rock ledges.
2: Is the back-and-forth movement of water caused by waves passing over head.
3: Is the backwash of water from waves breaking on shore.
, 4: None of the above. - correct answer..Surge is the back-and-forth movement of water
caused by waves passing over head.
Which 'if any' of the following are true?
1: Aquatic animals present a greater risk to divers than any other factor.
2: Most aquatic animal bites result from an animal's defensive response to a perceived
threat or, on rare occasions, from a case of mistaken identify.
3: Because they are perceived as more aggressive, men are more likely to be the victim
of an aquatic animal attack than women are.
4: None of the above. - correct answer..Most aquatic animal bites result from an
animal's defensive response to a perceived threat or, on rare occasions, from a case of
mistaken identify.
Psoriacysts produce toxins that, when touched, can produce symptoms ranging from a
mild rash or sting to anaphylactic shock or even paralysis.
1: True.
2: False. - correct answer..False.
Explanation:
Nematocysts produce toxins that, when touched, can produce symptoms ranging from a
mild rash or sting to anaphylactic shock or even paralysis.
Depending on circumstances, there are times when divers may wish to be positively,
negatively or neutrally buoyant.
1: True.
2: False. - correct answer..True.
A scuba cylinder that normally lasts one hour at the surface will last _______ minutes at
20 meters/66 feet.
1: 30
2: 20
3: 15
4: 10 - correct answer..20
Explanation:
A scuba cylinder that normally lasts one hour at the surface will last 20 minutes at 20
m/66 ft.
Which of the following is not true? Divers should equalize:
1: Preemptively before descent.
2: Well before feeling any pain or discomfort.
3: As soon as they feel any pain or discomfort.
4: Early and often during descent. - correct answer..As soon as they feel any pain or
discomfort.
All of the following are true except:
