SDI Final Exam 2025 UPDATE | 65 Questions with
100% Correct Answers | Verified | Updated 2025 |
ASSURED SUCCESS
Practice questions for this set
Terms in this set (64)
Objects under water Closer and larger than they do on land.
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.
,As you descend: All of the above.
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.
Which of the following Both the second and the third answer are correct.
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.
,Which of the following Water conducts heat away from your body 25 times
is/are true? faster than air does.
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.
When water stratifies itself Thermocline.
into layers, according to
temperature, the
boundary between layers
is known as a(n):
1: Halocline.
2: Ichtyocline.
3: Thermodyne.
4: Thermocline.
, Which of the following All of the above.
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.
The sun warming water True.
near the equator, coupled
with the earth's rotation, is
the primary cause of
permanent ocean
currents.
1: True.
2: False.
100% Correct Answers | Verified | Updated 2025 |
ASSURED SUCCESS
Practice questions for this set
Terms in this set (64)
Objects under water Closer and larger than they do on land.
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.
,As you descend: All of the above.
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.
Which of the following Both the second and the third answer are correct.
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.
,Which of the following Water conducts heat away from your body 25 times
is/are true? faster than air does.
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.
When water stratifies itself Thermocline.
into layers, according to
temperature, the
boundary between layers
is known as a(n):
1: Halocline.
2: Ichtyocline.
3: Thermodyne.
4: Thermocline.
, Which of the following All of the above.
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.
The sun warming water True.
near the equator, coupled
with the earth's rotation, is
the primary cause of
permanent ocean
currents.
1: True.
2: False.
