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block

Pressure changes in water for a given ascent or descent are much more substantial than the same distance ascent or descent in air because water weighs more.

Select the correct answer(s).  

(0/0)

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False

True

none

What is the relationship between air volume and density, and how do they vary according to this relationship when pressure increases or decreases?

Select the correct answer(s).  

(0/0)

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they do not change

inversely proportionate. As volume decreases, density increases... and visa-versa

directly proportionate. As volume decreases, density increases... and visa-versa

inversely proportionate. As volume decreases, density decreases... and visa-versa

none

Buoyancy control is one of the most important skills you can master because it allows you to control where you are in the water.

Select the correct answer(s).  

(0/0)

---

False

True

none

What are the absolute pressures, in atmospheres or bar, for:

Match the text (click and drag)   

(0/0)

Check Order Of Answers

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Match the text
10 meters/33 feet
20meters/66 feet
30 meters/99 feet
40 meters/ 132 feet

Click and drag
3 bar/ata
5 bar/ata
2 bar/ata
4 bar/ata

Check Order of Answers

none

A squeeze is:

Select the correct answer(s).  

(0/0)

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a pressure imbalance in which pressure inside an air space exceeds pressure outside an air space, resulting in pain or discomfort.

a pressure imbalance in which pressure outside an air space exceeds pressure inside an air space, resulting in pain or discomfort.

none

When you exhale, your lung volume decreases. This means you have ______ buoyancy.

Select the correct answer(s).  

(0/0)

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less

more

none

An object will be more buoyant in ______ than it would be in ______.

Select the correct answer(s).  

(0/0)

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fresh water, salt water

salt water, fresh water

none

What two pieces of equipment do you use to control your buoyancy?

Select the correct answer(s).  

(0/0)

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Fins

Lead Weights

BCD

Wetsuit

none

You want to equalize your ears:

Select the correct answer(s).  

(0/0)

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only if they hurt enough to bother you.

every meter/few feet before you feel discomfort.

when you feel discomfort.

none

The three major air spaces affected by pressure when you descend are:

Select the correct answer(s).  

(0/0)

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mask, ears and sinuses

lungs, mask and ears

sinuses, lungs, stomach

none

You usually feel pressure only in body air spaces because:

Select the correct answer(s).  

(0/0)

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water is denser than air, which resists pressure better.

your body is mostly made of incompressible liquid, but air is compressible and changes volume with pressure changes.

none

Complete the following chart for a sealed flexible bag full of air at the surface.

Fill in the blanks  

(0/0)

Check All Answers

---

Check Answer

Check Answer

Check Answer

Check Answer

---

Check All Answers

none

Which are techniques for equalizing your ears? (Check all that apply.)

Select the correct answer(s).  

(0/0)

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None of the above.

Pinch your nose and blow gently against it.

Swallow and wiggle your jaw from side to side.

Make a loud noise.

none

What is the relationship between increasing and decreasing depth and water pressure?

Select the correct answer(s).  

(0/0)

---

inversely proportionate

no relationship

directly proportionate

none

Equalization is adding air to an air space as you descend so the pressure in an air space equals the surrounding water pressure.

Select the correct answer(s).  

(0/0)

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True

False