# scuba.txt

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1. An object is positively buoyant when:
A) it displaces a volume of water weighing less than its own weight
B) it displaces a volume of water weighing equal to its own weight
C) it displaces a volume of water weighing more than its own weight
C) it displaces a volume of water weighing more than its own weight
(this multiple choice question has been scrambled)
2. What two pieces of equipment do you use to control your buoyancy:
A) BCD
C) Fins
A) BCD, B) Fins
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3. Buoyancy control is one of the most important skills you can master because it allows you to control where you are in the water:
A) true
B) false
A) true
4. an object will be more buoyant in ____ than it would be in ____ :
A) fresh water, salt water
B) salt water, fresh water
B) salt water, fresh water
5. When you exhale, your lung volume decreases. This means you have ____ buoyancy:
A) more
B) less
B) less
6. You usually feel pressure only in body air spaces because:
A) your body is mostly made of incompressible liquid, but air is compressible and changes volume with pressure changes.
B) water is denser than air, which resist pressure better
A) your body is mostly made of incompressible liquid, but air is compressible and changes volume with pressure changes
7. Pressure changes in water for a given ascent or desent are much more substantial than the same distance ascent or descent in air because water weighs more:
A) true
B) false
A) true
8. what is the absolute presure in atmospheres or bar for 10 metres/33 feet:
2 bar, 1/2 volume
9. what is the absolute presure in atmospheres or bar for 20 metres/66 feet:
3 bar, 1/3 volume
10. what is the absolute presure in atmospheres or bar for 30 metres/99 feet:
4 bar, 1/4 volume
11. what is the absolute presure in atmospheres or bar for 40 metres/132 feet:
5 bar, 1/5 volume
12. The three major air spaces affected b pressure when you descend are:
A) sinuses, lungs, stomach
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13. A squeeze is:
A) a pressure imbalance in which pressure inside an air space exceeds pressure outside an air space, resulting in pain or discomfort.
B) A pressure imbalance in which pressure outside an air space exceeds pressure inside an air space, resulting in pain or discomfort.
B) A pressure imbalance in which pressure outside an air space exceeds pressure inside an air space, resulting in pain or discomfort.
14. Equalization is adding air to an air space as you descend so the pressure in an air space equals the surrounding water pressure:
A) true
B) false
A) true
15. Which are techniques for equalizing your ears:
A) pinch your nose and blow gently against it
B) swallow and wiggle your jaw from side to side
C) make a loud noseD) none of the above
A) pinch your nose and blow gently against it. B) swallow and wiggle your jaw from side to side
16. You want to equalize your ears:
A) every meter/few feet before you feel discomfort
B) only if they hurt enough to bother you
C) when you feel discomfort
A) every meter/few feet before you feel discomfort
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17. If you feel discomfort and can't equalize, ascend until you relieve the discomfort and try again. Don't be forceful in equlizing. if you can't equalize, discintinue the dive.
A) true
B) false
A) true
18. The most important rule in scube diving is, Breathe continuously and never hold your breath:
A) true
B) false
A) true
19. Ascending while holdiing your breath:
A) can cause lung over expansion injuries
B) can cause serious injuries, including paralysis and death
C) causes injuries that are easy to avoid by not holding your breath
• A) can cause lung over expansion injuries
• B) can cause serious injuries, including paralysis and death
• C) causes injuries that are easy to avoid by not holding your breath
20. A reverse block is:
A) pain and discomfort caused by expanding air trapped inside an air space during ascent
B) pain and discomfort caused by outside pressure on an air space
A) pain and discomfort caused by expanding air trapped inside an air space during ascent
21. If you feel discomfort during ascent due to a reveerse block, you should:
A) slow or stop your ascent and give the trapped air time to work its way out
B) descend to compress the air and allow it to shift to some other area of the body
C) none of the above
A) slow or stop your ascent and give the trapped air time to work its way out
22. As you go deeper, you consume air from your scuba cylinder:
A) the same
B) slower
C) faster
C) faster
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23. The most efficient method for breathing underwater is rapid and shallow:
A) true
B) false
B) false
24. You need a mask to see underwater because:
A) the mask is an important part of looking really sharp
B) the human eye can't focus in water
C) the mask specially filters the light underwater
B) the human eye can't focus in water
(this multiple choice question has been scrambled)