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SDI Final Exam Questions and Answers | Latest Update 2024/2025
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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. ~~> Closer and larger than they do on land. As you descend: 1: Colors appear to fade. 2: Re...

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Voorbeeld van de inhoud

1 | P a g e | © copyright 2024/2025 | Grade A+


SDI Final Exam Questions and Answers
| Latest Update 2024/2025
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.

✓ ~~> 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.

✓ ~~> 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.




Master01 | September, 2024/2025 | Latest update

, 2 | P a g e | © copyright 2024/2025 | Grade A+

✓ ~~> 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.

✓ ~~> 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.

✓ ~~> 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.




Master01 | September, 2024/2025 | Latest update

, 3 | P a g e | © copyright 2024/2025 | Grade A+

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.

✓ ~~> 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.

✓ ~~> 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.

✓ ~~> If caught in a rip current, swim parallel to shore, until you are

completely out of the rip current, then swim in towards shore.




Master01 | September, 2024/2025 | Latest update

, 4 | P a g e | © copyright 2024/2025 | Grade A+

We measure waves by their height and weight.

1: True.

2: False.

✓ ~~> 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.

✓ ~~> 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:




Master01 | September, 2024/2025 | Latest update

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