Scuba

Your air supply lasts ____ as long as ____ metres/33 feet ( 2 bar/ata) than at the surface (1 bar/ ata)

1/2, 10

An Air volume would be _____ the surface volume and the density would _____? (Fractions / numbers)

1/3 / triple.

Your air supply lasts ____ as long at _____ metres than at the surface, ____ at 30 metres and so on.

1/3, 20, 1/4

If you take 6 litres of air from the surface to 20 metres/66 deer, the vol will be _____ liters.

2

The most important consideration when choosing a regulator is

A ease of breathing

A balloon fully inflated and sealed at 10 metres would probably ______ during ascent to the surface. Burst or shrink ?

Burst

As you descend in water, gas volume ______

Decreases and gas density increases bc they are packed into a smaller area

most efficient way to breathe underwater is

Deep and slow breathes

If cold or have allergies,

Don't dive.

Surface to 10 metres/33 feet

Double the pressure to 2 bar/ata (1 air plus 1 water. However a depth change of 10 metres/33 feet causes a pressure change of 1 bar.

As you descend in the water pressure ___________

Increases

If your regulator is not in your mouth you exhale ______

Slowly and release a streaky bubble stream so you aren't holding your breath.

If you cannot equalize,

Stop your descent immediately, signal and ascend till discomfort goes away and try again. If you have discomfort twice or more stop the dive.

20 metres/66 feet

The pressure is 3 bar/ata (1 air plus 2 water)

Expanding air can cause serious lung overexpansion injuries. T or F

True

I want to adjust the mask so the strap rests

Above my ears and over the crown of my head

I should equalize when A when I feel pain or discomfort B before I feel pain or discomfort C when I reach the bottom D only if I can't tolerate the pain or discomfort

B

To control my buoyancy, normally I will use my weight system and my

BCD

______ holds your kit together and allows you to adjust buoyancy throughout the dive

BCD

When choosing an alternative air source, a primary consideration involves deciding

Between independence and simplicity

Most important rule of scuba diving is to

Breathe continuously and never hold your breath

My mash encloses my nose so I can

Equalize the mask

To prevent certain "squeezes" in your sinuses, nose or ears, you must _______ as you descend.

Equalize. This can be done by adding air to the air spaces as you descend.

Reserve block occurs when

Expanding air becomes trapped in a body air space. Congestion can trap air in the ears or sinuses.

It's smart to eat gas producing foods prior to the dive and swallow air during the dive. T or F

False.

Using cold medication is recommended when diving. T or F?

False.

Using earplugs while diving is a great idea. T or F?

False.

The deeper you go, _____ energy is required to breathe.

More

If an object weighs more than the water it displaces, it sinks. This is _______ buoyancy

Negative

If an object weighs the same than the water it displaces, it neither floats or sinks. This is _______ buoyancy

Neutral

To equalize your ears and sinuses _____________ and blow gently against it.

Pinch your nose

If an object weighs less than the water it displaces, it floats. This is _______ buoyancy

Positive

The most important feature in my weight system is it's

Quick release

Delivers breathing air at the surrounding pressure when you inhale and directs exhaled air into the water

Regulator

The density of the air in the previous question would be ______ the density at the surface

Three times

I chill faster in water than in air of the same temperature bc water absorbs more heat than air does. True or false?

True

If you're faced with a problem while diving, stop what you're doing, then reduce anxiety by maintaining or restoring slow, deep breathing as you handle the problem. T or F?

True

Low profile mask sits close to your face and gives you a wider field of view. True or false

True

My BCD should have adequate capacity to easily float my equipment and me at the surface TRUE OR FALSE

True

Never hold your breathe while scuba diving. T or F?

True

The LPI mechanism inflates the BCD with air from my scuba cylinder true or false

True

When scuba diving, normal breathing keeps your lungs equalized to the surrounding pressure. T or F?

True

Buoyancy is an ______ force acting on an object in water, which is why you feel "_______" in the water.

Upward / lighter

________ can be a consequence if equalizing too aggressively or forcing equalization

Vertigo, ear rupture, ear injuries over all

Holding your breath while ascending is a bad idea because?

Your lungs will over expand. They would be much like a balloon filled and Wales at depth, which expanding air would burst during ascent.

A squeeze is caused by :

a pressure imbalance between the surrounding pressure and an air space

Equalization is the process of _________

adding air to an air space

The two basic fin styles are __________ fins

adjustable and full-foot

When I descend, my buoyancy tends to ________. When I ascend, it tends to _______.

decrease, increase

Trim means having the right _____ of weight

distribution

My buddy and I descend to 12 metres/40 feet. I would expect to use my air _______ at 6 metres/20 feet

faster than

My primary considerations while choosing fins are:

fit and blade size

Underwater when I inhale my buoyancy

increases slightly

Underwater objects appear:

larger and/or closer

I need a mask because

my eyes must be in air to focus

I should have my scuba cylinder filled

only by reputable scuba air stations

When my snorkel is in my mouth the tip should be

over the crown of my head

My sunglasses case falls out of my pocket into the water, but fortunately, it floats so I retrieve it. I would say my sunglasses case is ______ buoyant

positively