Divers certification quizzes

A depth change of 10 metres/33 feet causes a pressure change of

1 bar/ata

I want to adjust my mask so the strap rests

above my ears, over the crown of my head

Accessory weights

can help you adjust your trim

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

true

Which of the following are among the breathing rules I follow as a diver? (choose all that apply):

1) If faced with a problem, stop, then maintain or restore slow, deep breathing. 2) Breathe continuously and never, ever, hold my breath. 3) Breathe slowly and deeply. 4) Do not allow myself to get winded or out-of-breath.

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

2

My SPG is always part of my dive computer.

false

When scuba diving, normal breathing keeps your lungs equalized to the surrounding pressure.

true

My buddy is rinsing a BCD and partially fills the bladder with water. Is this consistent with recommended BCD care?

yes

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

BCD (Buoyancy Control Device)

I should equalize

Before I feel pain or discomfort

The most important rule in scuba diving is to

Breathe continuously and never hold your breath

My mask encloses my nose so I can

Equalize the mask

Failure to follow the most important rule in scuba diving can cause severe lung overexpansion injuries, which can result in paralysis or death.

True

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 choosing an alternate air source, a primary consideration involves deciding

between independence and simplicity.

My primary considerations when choosing fins are fit and

blade size

A balloon fully inflated and sealed at 10 metres/33 feet, would probably _______ during ascent to the surface.

burst

The ____________ is a safety device that relieves accidental overpressure by releasing air before reaching the pressure at which the cylinder would fail.

burst disk

On a day I plan to go diving, I wake up with my sinuses blocked due to a cold or allergy. I should

cancel the dive until I'm well

The three most important considerations in choosing scuba equipmentare suitability, fit and ____________.

comfort

When I descend, my buoyancy tends to _________. When I ascend, it tends to __________.

decrease, increase

The most efficient way to breathe dense air underwater is to breathe

deeply and slowly

Trim means having the right ________ of weight.

distribution

The most important consideration when choosing a regulator is

ease of breathing

Scuba cylinders require pressure testing __________ and visual inspection _________.

every 2-5 years, annually

A cylinder with a higher working pressure always holds more air than a cylinder with a lower working pressure.

false

From among masks that fit me, I should choose a mask that fits as far away from my face as possible.

false

I'm renting a scuba cylinder at a dive resort. Among the cylinders for hire, some have green and yellow bands that read "Nitrox." As a PADI Open Water Diver with no other training or instructor supervision, am I qualified to use one of these cylinders?

false

Salt water causes more buoyancy than fresh water because it is less dense and weighs less.

false

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

faster than

As you descend in water the pressure

increases

Underwater, when I inhale, my buoyancy

increases slightly

Before each use, I should__________________my equipment.

inspect

As I descend, increasing pressure affects my:

mask, ears, sinuses

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

The most important feature of my weight system is its

quick release

I bring a cylinder aboard a dive boat in preparation for a trip out to a nearby reef. The normal procedure would be to

secure the cylinder in a rack.

When setting up and wearing my kit, the alternate air source

secures in the triangle formed by my hips and chin.

I'm descending and discover I can't equalize. The first thing I would do is

stop my descent and signal my buddy/the instructor.

During ascent I feel discomfort in my ears. I should

stop, descend slightly and allow trapped air to work its way out.

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

three times

Getting the service my gear needs may be a consideration when choosing equipment.

true

I equalize gently because an extended, forceful equalization can cause permanent damage to my ears and hearing.

true

In recreational diving, the buddy system means diving with another diver or divers in a team that provides assistance and safety benefits.

true

It is important to master buoyancy control because it affects almost everything I do in and underwater.

true

My body responds to anxiety with increased breathing, but slow breathing helps reduce anxiety.

true

My local dive pro will usually set up my regulator components

true

Regulators need periodic overhauls, typically every year to two years.

true

Snorkels are standard equipment for scuba diving because they allow me to breathe with my face in the water, or in rough conditions, without wasting my scuba air, especially when I have little scuba air remaining.

true

Some scuba divers prefer a snorkel with a flexible lower portion so it drops out of the way when not in use.

true

The LPI mechanism inflates the BCD with air from my scuba cylinder.

true