Objects under water appear:

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Objects under water appear:

Question 1Select one:

The same size as they do on land. Twice as large as they do on land. Closer and larger than they do on land.Smaller and farther away than they do on land.Feedback

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As you descend:

Question 2Select one:

Colors appear to fade.Reds and oranges are among the first colors to disappear.At 30 m/99 ft, little color remains other than blues, grays, blacks and whites. All of the above.Feedback

Question text How much faster does sound travel in water, compared to air?

Question 3Select one:

Twice as fast.Four times as fast. Over 200 times as fast.Question 1 Correct Mark 1 out of 1

Flag question Objects under water appear both closer and larger than they do on land.

The correct answer is: Closer and larger than they do on land.

All of the supplied answers are true.

The correct answer is: All of the above.

Question 2 Correct Mark 1 out of 1

Flag question Question 3 Correct Mark 1 out of 1

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Over 800 times as fast.Feedback

Question text

Water conducts heat away from your body:

Question 4Select one:

Twice as fast as air does.Four times faster than air does. Ten times faster than air does.Twenty-five times faster than air does.Feedback

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The presence of thermoclines means that:

Question 5Select one:

Surface temperatures will provide divers with a good indication of what they can expect at depth.Divers may require less in the way of exposure protection at depth than they will at the surface.Divers may require more in the way of exposure protection at depth than they will at the surface.None of the above.

Question 6 Sound travels approximately four times faster under water. (Water is 800 times denser than air.)

The correct answer is: Four times as fast.

Water conducts heat away from your body 25 times faster than air does.

The correct answer is: Twenty-five times faster than air does.

Feedback The presence of thermoclines means that divers may require more in the way of exposure protection at depth than they will at the surface.

The correct answer is: Divers may require more in the way of exposure

protection at depth than they will at the surface.Question 4 Correct Mark 1 out of 1

Flag question Question 5 Correct Mark 1 out of 1

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Question text Which of the following is not true?

Question 6Select one:

Entering shallow water causes the base of a wave to slow.Entering shallow water forces wave energy upward, making the wave crest unstable and causing it to break.If the bottom of a wave moves faster than the top, the wave will break. Both the first and second answers are true.

Question text Surge is the backwash of water from waves breaking on shore.

Question 7Select one:

True False Feedback

Question text In general, the best time to dive is during slack tide, the period between high and low tides.

Question 8Select one:

True Incorrect Mark 0 out of 1

Flag question Feedback 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.

The correct answer is: If the bottom of a wave moves faster than the top, the

wave will break.Surge is the back-and-forth movement of water caused by waves passing over head.The correct answer is 'False'.Question 7 Correct Mark 1 out of 1

Flag question Question 8 Correct Mark 1 out of 1

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