Scuba Quiz

Answers to the Scuba Quiz

 

1. (B) 21%, 79%

Explanation: The composition of dry air is made up (by volume) of the following
Oxygen 20.946%, Nitrogen 78.084%, Argon 0.934% and Cardon Dioxide 0.033%.

2. (B) False

Explanation: The force of buoyancy is predicted by Archimedes´Principle (named for the Greek mathematician), which says: An object wholly or partly immersed in a fluid is bouyed up by a force equal to the weight of the fluid displaced by the object.

3. (D) Blow into your mask through your nose

Explanation: Mask squeeze occurs most commonly on very rapid descent when a diver neglects to equalize the mask air space by exhaling through the nose.

4. (C) Ease of Breathing

Explanation: Although the regulator comes in different sizes, the ease of breathing is the most important aspect. The mouth piece can always be changed to fit more comfortably to your mouth.

5. (D) A quick release mechanism

Explanation: Every weight system used by recreational divers must have a quick release that allows you to get rid of some or all of your weight with one hand in a single movement.(Note the reference to ´some´), you don´t necessarily have to drop all your weight, but just enough to assure that you can float comfortably.

6. (A) Where the sound is coming from

Explanation: Sound travels faster in water than in air, making it hard to determine its source. This is why you can´t tell where the boat is by the sound of its engines. However, you can hear it from farther away than you would in air.

7. (D) Attached to the triangle area between your chin and your chest

Explanation: The alternative air source is typically on a slightly longer hose than the primary in your mouth and is usually secured in sight of the triangle formed by our chin and the bottom of your rib cage in such a way that it pulls free with a firm tug.

8. (C) Ascent (go up) and descend (go down) along the bottom or a reference line

Explanation: Focusing on a fixed reference will prevent the effects of vertigo.
Try to focus on your buddy when descending/ascending a reference line in a vertical head up position.

9. (D) All of the above

Explanation: Winds cause waves which increase the water movement and rains can bring cascading water, this in turn can cause the bottom composition to move, this can be sand and silt, which can therefore reduce visibility.

10. (C) The animal is protecting itself from you

Explanation: If something 10 times or more your size starting prodding you, you would act defensively, aquatic life is no different. Passive Interaction is best – do nothing to disrupt the normal behavior, swim along, watch and take photos in ways that do not frighten or otherwise disrupt.

11. (A) Nitrogen bubbles

Explanation: Decompression sickness refers to the conditions caused by inert nitrogen or other gases coming out of solution and forming bubbles within the body, these bubbles can block blood flow and can cause other forms of tissue damage.

 

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