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