SSI Assistant Instructor Pre-Test – Study Guide, Key Concepts & Practice
Questions Review
Assuming a maximum partial pressure limitation of 1.4 bar, the maximum depth for a 32%
nitrox mixture is ____ of seawater.
33.7 m
20 m
66 m
43.7 m - correct answer ✔✔33.7 m
Which physical law states: "If temperature remains constant, the pressure and volume of any
gas are inversely related"?
Dalton
Henry
Archimedes
Boyle
Save - correct answer ✔✔Boyle
For every meter of depth in freshwater, pressure changes by:
0.013 bar
0.098 bar
0.100 bar
1.03 bar - correct answer ✔✔0.098 bar
diver and his / her equipment weigh 87 kg when neutrally buoyant in saltwater. To be neutrally
buoyant for freshwater diving with the same equipment, he /she has to:
Add weight
,All answers are correct
Use the same weight
Remove weight - correct answer ✔✔Remove weight
If 2 liters of air are needed in your buoyancy compensator to maintain neutral buoyancy at 10m
in the ocean, what will happen to your buoyancy if you ascend 3 m without deflating:
Your positive buoyancy will increase
There will be no change in buoyancy
Your negative buoyancy will increase
You will stay neutral no matter if you ascend or descend - correct answer ✔✔Your positive
buoyancy will increase
Breathing gas consumption:
Varies inversely with depth
Increases as depth increases
Decreases as depth increases
Remains the same as depth increases - correct answer ✔✔Increases as depth increases
The ocean depth at which the partial pressure of oxygen in air equals 1.6 bar is _____ meters
assuming O2 = 21%.
70
85
66
55 - correct answer ✔✔66
Assuming a maximum partial pressure limitation of 1.4 bar, the maximum MOD for a 40% nitrox
mixture in the ocean is:
, 35 meters
25 meters
40 meters
20 meters - correct answer ✔✔25 meters
The absolute pressure at a depth of 50 meters in salt water is:
5.012 bar
6.000 bar
5.000 bar
5.901 bar - correct answer ✔✔6.000 bar
What would be the surface air consumption rate (SAC) of a diver with a 200bar, 10 liter cylinder
who uses 50bar in 10 minutes at a depth of 10 meters in the ocean?
25 liters / minute
50 liters / minute
35 liters / minute
10 liters / minute - correct answer ✔✔25 liters / minute
If you have difficulty equalizing pressure in your ears/sinuses while descending, you should:
Ascend 2 meters and force equalization
Stop and wait until the discomfort subsides
Ascend until the pressure is relieved and then attempt equalization
Return to the surface and re-initiate the descent - correct answer ✔✔Ascend until the pressure
is relieved and then attempt equalization
A lung rupture can occur with over-pressurization in water as shallow as:
5.0m
Questions Review
Assuming a maximum partial pressure limitation of 1.4 bar, the maximum depth for a 32%
nitrox mixture is ____ of seawater.
33.7 m
20 m
66 m
43.7 m - correct answer ✔✔33.7 m
Which physical law states: "If temperature remains constant, the pressure and volume of any
gas are inversely related"?
Dalton
Henry
Archimedes
Boyle
Save - correct answer ✔✔Boyle
For every meter of depth in freshwater, pressure changes by:
0.013 bar
0.098 bar
0.100 bar
1.03 bar - correct answer ✔✔0.098 bar
diver and his / her equipment weigh 87 kg when neutrally buoyant in saltwater. To be neutrally
buoyant for freshwater diving with the same equipment, he /she has to:
Add weight
,All answers are correct
Use the same weight
Remove weight - correct answer ✔✔Remove weight
If 2 liters of air are needed in your buoyancy compensator to maintain neutral buoyancy at 10m
in the ocean, what will happen to your buoyancy if you ascend 3 m without deflating:
Your positive buoyancy will increase
There will be no change in buoyancy
Your negative buoyancy will increase
You will stay neutral no matter if you ascend or descend - correct answer ✔✔Your positive
buoyancy will increase
Breathing gas consumption:
Varies inversely with depth
Increases as depth increases
Decreases as depth increases
Remains the same as depth increases - correct answer ✔✔Increases as depth increases
The ocean depth at which the partial pressure of oxygen in air equals 1.6 bar is _____ meters
assuming O2 = 21%.
70
85
66
55 - correct answer ✔✔66
Assuming a maximum partial pressure limitation of 1.4 bar, the maximum MOD for a 40% nitrox
mixture in the ocean is:
, 35 meters
25 meters
40 meters
20 meters - correct answer ✔✔25 meters
The absolute pressure at a depth of 50 meters in salt water is:
5.012 bar
6.000 bar
5.000 bar
5.901 bar - correct answer ✔✔6.000 bar
What would be the surface air consumption rate (SAC) of a diver with a 200bar, 10 liter cylinder
who uses 50bar in 10 minutes at a depth of 10 meters in the ocean?
25 liters / minute
50 liters / minute
35 liters / minute
10 liters / minute - correct answer ✔✔25 liters / minute
If you have difficulty equalizing pressure in your ears/sinuses while descending, you should:
Ascend 2 meters and force equalization
Stop and wait until the discomfort subsides
Ascend until the pressure is relieved and then attempt equalization
Return to the surface and re-initiate the descent - correct answer ✔✔Ascend until the pressure
is relieved and then attempt equalization
A lung rupture can occur with over-pressurization in water as shallow as:
5.0m
