Section 1 Flashcards
As you descend in water the pressure
A. increases
B. decreases
C. does not change
A. increases
A depth change of 10 m/33 ft causes a pressure change of A. 1 bar/ata B. 2 bar/ata C. 3 bar/ata D. 4 bar/ata
A. 1 bar/ata
if you take 6 litres of air from the surface to 20 m/66 ft, the volume will be \_\_\_\_ litres A. 1 B. 2 C. 3 D. 4
B. 2
if you take 6 litres of air from the surface to 20 m/66 ft, the density of air will be \_\_\_\_ the density at the surface A. one third B. one half C. three times D. four times
C. three times
a balloon fully inflated and sealed at 10 m/33 ft, would probably ____ during ascent to the surface
A. shrink (become smaller)
B. burst
B. burst
as I descend, increasing pressure affect(s) my A. mask B. ears C. sinuses D. skin
A. mask, B. ears, and C. sinuses
equalization is the process by 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
a squeeze is caused by
A. wearing my wet suit or other gear too tightly
B. a pressure imbalance between the surrounding pressure and an air space
B. a pressure imbalance between the surrounding pressure and an air space
I should equalize A. when I feel pain or discomfort b. only if I can't tolerate the pain or discomfort C. before I feel pain or discomfort D. when I reach the bottom
C. before I feel pain or discomfort
I’m descending and discover I can’t equalize. the first thing I would do is
A. equalize more forcefully
B. stop my descent and signal my buddy/the instructor
C. slow my descent and see if the problem corrects itself
B. stop my descent and signal my buddy/the instructor
I equalize gently because an extended, forceful equalization can cause permanent damage to my ears and hearing
true/false
true
on a day I plan to go diving, I wake up with my sinuses blocked due to a cold or allergy. I should
A. take an approved decongestant so I will be able to equalize
B. plan to take a lot longer as I descend
C. cancel the dive until I’m well
C. cancel the dive until I’m well
when scuba diving, normal breathing keeps your lungs equalized to the surrounding pressure
true/false
true
the most important rule of scuba diving is to
A. always dive with a buddy
B. breathe continuously and never hold your breath
C. check your air supply every five minutes
B. breathe continuously and never hold your breath
failure to follow the most important rule in scuba diving can cause severe lung expansion injuries, which can result in paralysis or death
true/false
true
during ascent I feel discomfort in my ears. I should
A. continue my ascent at a slightly faster rate
B. stop, descend slightly and allow trapped air to work its way out
C. use a decongestant before my next dive
D. equalize by blowing gently against blocked nostrils
B. stop, descend slightly and allow trapped air to work its way out
my buddy and I descend to 12 m/40 ft. I would expect to use my air _____ at 6 m/20 ft
A. slower than
B. at the same rate as
C. faster than
C. faster than
the most efficient way to breathe dense air underwater is to breathe A. shallowly and slowly B. shallowly and rapidly C. deeply and slowly D. deeply and rapidly
C. deeply and slowly
my body responds to anxiety with increased breathing, but slow breathing helps reduce anxiety
true/false
true
which of the following are among the breathing rules I follow as a diver? (choose all that apply)
A. breathe continuously and never, ever, hold my breath
B. breathe slowly and deeply
C. do not allow myself to get winded or out of breath
D. if faced with a problem, stop, then maintain or restore slow, deep breathing
all of them
A. breathe continuously and never, ever, hold my breath
B. breathe slowly and deeply
C. do not allow myself to get winded or out of breath
D. if faced with a problem, stop, then maintain or restore slow, deep breathing
Buoyancy is a force that pushes an object in water upward
true/false
true
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
A. positively
B. negatively
C. neutrally
A. positively
salt water causes more buoyancy than fresh water because it is less dense and weighs less
true/false
false. salt water cause more buoyancy because it is more dense and weighs more, buoyancy results from the weight of the water displaced
to control my buoyancy, normally I will use my weight system and my A. fins B. scuba cylinder C. wet suit D. BCD
D. BCD
when I descend, my buoyancy tends to \_\_\_\_. when I ascend, it tends to \_\_\_\_. A. increase, increase B. increase, decrease C. decrease, increase D. decrease, decrease
C. decrease, increase
underwater, when I inhale, my buoyancy
A. decreases slightly
B. increases slightly
C. doesn’t change
B. increases slightly