Knowledge Review 1 Flashcards
Complete the following depth-pressure-air volume-air density table:
Depth Pressure Volume Density
0m/0ft 1 bar/ata 1 x 1
10m/33 ft ??????? 1/2 ???
30m/99 ft ???????? 1/4 ???
40 m/132 ft 5 bar/ata 1/5 x5
Pressure Volume Density
2 bar/ata x2
4 bar/ata x4
1/5
As I descend, I need to equalize air spaces. Which of the following are accepted ways of equalizing my ears?
A) Block my nose and attempt to gently blow through it.
B) Swallow and wiggle the jaw from side to side
C) Block my nose and blow forcefully for an extended period
A) Block my nose and attempt to gently blow through it
B) Swallow and wiggle the jaw from side to side
During a descent, I try to equalize but discover I’m having trouble doing so. Which of the following is correct:
A) Slow my descent, signal my buddy to slow down, and equalize my forcefully.
B) Stop my descent, signal my buddy, ascend slightly and try again.
C) Continue my descent while equalizing repeatedly
D) Signal my buddy, ascend to the surface, and start my descent over.
B) Stop my descent, signal my buddy, ascend slightly, and try again.
I should equalize:
A) Early and often, before I feel discomfort.
B) When I begin to feel discomfort.
C) Only if I experience pain.
A) Early and often, before I feel discomfort.
I should not dive with a cold, nor use medications to dive with a cold.
True or False
True
The most important rule in scuba diving is:
A) Breathe continuously and never hold my breath.
B) Always dive with a buddy.
C) Keep my mask on while in the water, even at the surface
D) Check my SPG at least every couple of minutes.
A) Breath continuously and never hold my breath
Failure to follow the most important rule in scuba diving can cause serious lung overexpansion (lung rupture) injuries, which in turn can cause paralysis and death.
True or False
True
If I feel discomfort in a body air space while ascending, the correct action is to:
A)Continue my ascent while blowing against blocked nostrils.
B) Stop, descend slightly and give trapped air time to work its way out.
C) Descend at least 10 metres/33 feet, then resume my ascent.
B) Stop, descend slightly and give trapped air time to work its way out
My buddy and I are planning a dive to 18 metres/60 feet. We would expect our air supply to last _______ at 10 metres/33 feet, all else being the same.
A) longer
B) shorter than
C) the same as
B) shorter than
During a dive, I swim hard to keep up with a fish that interests me, but shortly begin to feel like I can’t get enough air. The correction action would be to:
A) Signal my buddy and head up to the surface.
B) Use the regulator purge button to boost air flow
C) Stop all activity and rest to restore proper deep, slow breathing
C) Stop all activity and rest to restore proper deep, slow breathing
An object that is neutrally buoyant in fresh water will_______ in salt water
A) sink
B) float
C)be neutrally buoyant
B) float
The three overall benefits of the buddy system are practicality, safety, and fun.
True or False
True
The primary considerations when choosing any piece of scuba gear are: A) Suitability B) Brand C) Fit D) Comfort
A) Suitability
C) Fit
D) Comfort
I’m planning to dive the following week and am checking my gear. I put my kit together and notice that my regulator seems to breathe harder than I remember. The appropriate action would to:
A) Have it inspected and serviced as needed by a professional before using it
B) Go ahead and use it, but limit my dive depth to 10 metres/30 feet
C) Wash it in fresh water and see if the problem persists
A) Have it inspected and serviced as needed by a professional before using it.
There is no way to use a DIN regulator on a yoke valve
True or False
False
