SSI Open Water Diver – Chapters 1–3 Study Guide, Key Concepts & Practice
Questions Review
One atmosphere of pressure is defined as:
Each ______ feet of depth in freshwater
each ______ ft. of depth in saltwater
____ ata - correct answer ✔✔34, 33, 1
The absolute pressure expressed in terms of atmospheres absolute at 33 ft. in sea water is: -
correct answer ✔✔2 ata
Underwater, the bending of light rays causes objects to appear to be: - correct answer
✔✔Closer
If you experience pain in your ears during descent: - correct answer ✔✔Stop the descent and
ascend until the pain stops.
Sinus squeeze can be prevented by: - correct answer ✔✔Not diving with a cold
Ear squeeze can be prevented by:
(3 answers) - correct answer ✔✔Rotating the jaw, swallowing or Valsalva
Never diving with a cold
Relaxing
,The purpose of equalization is to: - correct answer ✔✔Introduce additional air into body air
spaces in response to increasing external pressure
Describing diving with the acronym SCUBA came from what event? - correct answer ✔✔The
development of the demand regulator in 1943
The most efficient breathing pattern for scuba diving is: - correct answer ✔✔A deep balanced
inhalation followed by a long balanced
Which of the following Total Diving System subsystems best describes the SCUBA unit?
The _____ system - correct answer ✔✔The delivery system
Assuming a consistent air consumption rate, diving at a pressure of 4 ata will use __ times as
much air as diving at 2 ata. - correct answer ✔✔2
An object immersed in water will be buoyed upward by a force ______ the weight of the water
it displaces. - correct answer ✔✔equal to
The three primary features to look for in a quality Exposure System are: - correct answer
✔✔Thickness, fit, and seam integrity
The three Basic Rules of Scuba stated in the proper order of importance are:
breathe ______
ascend ______ and ______ ________
, never _____ _______ or _______ your ______ __ ______- - correct answer ✔✔Breathe
continuously, ascend slowly and maintain control, and never dive alone or beyond your level of
training.
The delivery system components are: - correct answer ✔✔A regulator, alternate air source, and
a high pressure scuba cylinder
The Buoyancy Control System components are:
a) Buoyancy compensator, exposure suit, and inflation device
b) Buoyancy compensator and inflation device
c) Regulator, inflation device, and weight belt or BC weight pockets
d) Buoyancy compensator, inflation device, and weight belt or BC weight pockets - correct
answer ✔✔Buoyancy compensator, inflation device, and weight belt or BC weight pockets
If a flexible air-filled container at 100 feet of sea water has a volume of 10 cu ft, what would be
the volume if it were transported to the surface?
a) 30 cu ft
b) 20 cu ft
c) 15 cu ft
d) 40 cu ft - correct answer ✔✔40 cu ft
Questions Review
One atmosphere of pressure is defined as:
Each ______ feet of depth in freshwater
each ______ ft. of depth in saltwater
____ ata - correct answer ✔✔34, 33, 1
The absolute pressure expressed in terms of atmospheres absolute at 33 ft. in sea water is: -
correct answer ✔✔2 ata
Underwater, the bending of light rays causes objects to appear to be: - correct answer
✔✔Closer
If you experience pain in your ears during descent: - correct answer ✔✔Stop the descent and
ascend until the pain stops.
Sinus squeeze can be prevented by: - correct answer ✔✔Not diving with a cold
Ear squeeze can be prevented by:
(3 answers) - correct answer ✔✔Rotating the jaw, swallowing or Valsalva
Never diving with a cold
Relaxing
,The purpose of equalization is to: - correct answer ✔✔Introduce additional air into body air
spaces in response to increasing external pressure
Describing diving with the acronym SCUBA came from what event? - correct answer ✔✔The
development of the demand regulator in 1943
The most efficient breathing pattern for scuba diving is: - correct answer ✔✔A deep balanced
inhalation followed by a long balanced
Which of the following Total Diving System subsystems best describes the SCUBA unit?
The _____ system - correct answer ✔✔The delivery system
Assuming a consistent air consumption rate, diving at a pressure of 4 ata will use __ times as
much air as diving at 2 ata. - correct answer ✔✔2
An object immersed in water will be buoyed upward by a force ______ the weight of the water
it displaces. - correct answer ✔✔equal to
The three primary features to look for in a quality Exposure System are: - correct answer
✔✔Thickness, fit, and seam integrity
The three Basic Rules of Scuba stated in the proper order of importance are:
breathe ______
ascend ______ and ______ ________
, never _____ _______ or _______ your ______ __ ______- - correct answer ✔✔Breathe
continuously, ascend slowly and maintain control, and never dive alone or beyond your level of
training.
The delivery system components are: - correct answer ✔✔A regulator, alternate air source, and
a high pressure scuba cylinder
The Buoyancy Control System components are:
a) Buoyancy compensator, exposure suit, and inflation device
b) Buoyancy compensator and inflation device
c) Regulator, inflation device, and weight belt or BC weight pockets
d) Buoyancy compensator, inflation device, and weight belt or BC weight pockets - correct
answer ✔✔Buoyancy compensator, inflation device, and weight belt or BC weight pockets
If a flexible air-filled container at 100 feet of sea water has a volume of 10 cu ft, what would be
the volume if it were transported to the surface?
a) 30 cu ft
b) 20 cu ft
c) 15 cu ft
d) 40 cu ft - correct answer ✔✔40 cu ft
