Scuba

Depth change of 10 meters/33 feet causes a pressure change of?

1 bar/ata

What are the 4 breathing rules to follow as a diver?

1. Breath continuously and never, ever hold your breath 2. Breathe slowly and deeply 3. Do not allow yourself to get winded or out of breath 4. When a problem arises, stop, then reduce anxiety by maintaining or restoring slow and deep breathing

The dive buddy system has three overall benefits.

1. Practicality: assisting each other 2. Safety: prevent problems, assist in emergency 3. Fun: its a social activity

Two equipment items that control buoyancy?

1. Weight system: holds enough lead weight to offset positive buoyancy 2. Buoyancy Control Device (BCD): Inflating and deflating increases and decreases your volume- how much water you displace. Allows you to be Positive buoyancy, Negative buoyancy, Neutral buoyancy when ever you want

First step for BCD care. Rinse inside of bladder with....1..... water as well as outside. Fill it about .....2.... with water, rest with air. Drain though the ....3... and each of the ....4.... Second step Store the BCD....5...

1. fresh water 2. 1/3rd 3. LPI exhaust 4. quick dump 5. partially inflated

To prevent rupturing the bladder due to overfilling the BCD has values named...1.... that ...2... vent if the BCD is too full. Some have a ...3.... value that ...4... air

1. overpressure 2. automatically 3. quick dump (exhaust) 4. manually release

If 6 liters of air descends from the surface to 20 meters/66 feet, the volume will be ........ liters?

2 liters 20 meters/66 feet= 1/3 volume 6 divided by 1/3=2

As you descend in water the pressure? a. increases b. decreases c. does not change

A. increases

At 10 meters/33 feet, how long does air supply last then at the surface? What about at 20 meters/66 feet?

Air supply last 1/2 as long at 10/33 then at the surface Air supply last 1/3 as long at 20/66 then at the surface

Most efficient way to breathe dense air underwater is to breath? a. Shallowly and slowly b. Deeply and slowly c. Deeply and rapidly

B. Deeply and slowly Make air last by saving energy and not to over exert

How does my breathing change in a response to anxiety, how can I change my breathing to reduce anxiety

Breathing increase in a response to anxiety Slow breathing helps reduce anxiety

What is buoyancy?

Cancels the putt of gravity. Upward force acting on an object in water Force is caused by the water displaced by the object, and is equal to the weight of the water displaced

Why is it important to breathe continuously and never hold your breath. (Results if failure to do so)

Cause severe lung over expansion injuries, may result in paralysis or death

Three most important considerations in choosing scuba gear are suitability, fit, and ...?

Comfort

When I descend, My buoyancy....? When I ascend, My buoyancy...?

Decreases Increases

Descending do what to your BCD? Ascending do what to your BCD?

Descending- Add air Ascending- Release air

As you go deeper what happens to air supply?

Each breath takes more air from cylinder The deeper you go the faster you use your air.

What is one important feature my mask has to included and why?

Enclosed nose To be able to equalize the mask

How should I breath when my regulator is not in my mouth?

Exhale a slow and steady bubble stream. Make sure to not hold breath

Descent at 12 meters/40 feet. Would expect to use my air.........then at 6 meter/20 feet

Faster than

When adjusting my mask strap, The strap should fit......... of head, .......... ears

Fit over the crown of head, above ears

What is a reverse block? Does it occur when descending or ascending?

Happens when expanding air becomes trapped in a body air space. ascending

BCD inflatable bladder is a bag that??

Inflate or deflate to change buoyance

The snorkel goes on the .... side -Left or Right and when mouthpiece is in the tip is ...... my ...... a. above my forehead b. over the crown of my head c. at the base of my skull

Left b. over the crown of my head

I need a make underwater because?

My eyes much be in air to focus

Sunglasses fall in to water and float. They would have ..... buoyancy?

Positive

What are the pressure, air volume, and air density at 30 metters/99 feet?

Pressure= 4bar/ata Air Volume= 1/4 surface volume Air Density= 4 times surface

After use in salt, chlorinated or fresh water with dirt, I should first......... followed by ....... before ........?

Rinse everything with clean fresh water Let it dry out in the sun Storing in a cool, dry place

Fresh water is more dense and weighs more then salt water. Which has more buoyancy?

Salt Water

BCD should have adequate capacity to easily float at the surface True or Falswe

True

Extended, forceful equalization can cause permeant damage to ears & hearing so its important to equalize gently. True OR False

True

LPI (low pressure inflator) mechanism inflates the air from the cylinder True or false

True

Snorkels are standard because they allow me to breath with my face in the water, or in rough conditions, without wasting my scuba air especially when I have little air left. True or False

Ture

Buoyancy is a force that pushes an object in water....?

Upward

When a reverse block occurs what will I feel and what should I do?

Will feel discomfort in any air space, such as mask, ears, sinuses. Immediately slow or stop ascent. Descend a few feet to reduce discomfort and give trapped air time to work its way out Ascend more slowly to give expanding air time to exit.

Does the amount of time gear spend in sunlight have any effect on the gear?

Yes, try avoid long periods of direct sunlight, cover it between dives. Could speed up deterioration

What are a. Positive buoyancy b. Negative buoyancy c. Neutral buoyance

a. Positive buoyancy: object weighs less then water it displaces. It floats b. Negative buoyancy: object weighs more then water it displaces. It sinks c. Neutral buoyancy: object weighs the same then water it displaces. Doesn't float or sink.

Equalization is the process of? a. adding air to an air space b. removing air from an air space c. reducing the surrounding pressure d. increasing the surrounding pressure

a. adding air to an air space

Before each use, I should ..... my gear? a. inspect b. wash c. warm d. dry

a. inspect

Balloon fully inflated at 10 meters/33 feet would probably .... durning ascent to the surface. a. shrink b. burst

b. burst

Under water, I inhale, my buoyancy? a. decreases slightly b. increases slightly c. doesn't change

b. increases slightly

When snorkel is in mouth, the tip should be? a. above forehead b. over the crown of head c. at the base of skull

b. over the crown of head

Most important rule in scuba diving is to?

breathe continuously and never hold your breath

When should I equalize? a. when I feel pain or discomfort b. only if I cant tolerate pain or discomfort c. before I feel pain or discomfort d. when I reach the bottom or discomfort

c. before I feel pain or discomfort

While descending I cant equalize, first things I should do is? a. slow my descent and see if problem corrects itself b. equalize more forcefully c. stop descent and signal buddy/instructor

c. stop descent and signal buddy/instructor

If 6 liters of air ascends from the 20 meters/66 feet to the surface, the density of air at 20 meters would be ...... the density at the surface. a. 1/3 b. 1/2 c. three times d. four times

c. three times

As I descend, increasing pressure affects which three major body air spaces?

mask ears sinuses