SSI ASSISTANT INSTRUCTOR PRE-TEST EXAM
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 - 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 - ANSWER: Boyle
For every meter of depth in freshwater, pressure changes by:
0.013 bar
0.098 bar
0.100 bar
1.03 bar - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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
1.2m
3.5m
4.0m - ANSWER: 1.2m
The recommended method to avoid sinus squeezes and reverse blocks is to:
Ascend and descend slowly to allow gradual equalization
Dive only when your sinuses are healthy and clear
Only use decongestants that do not produce side effects
Forcibly equalize the pressure in your sinuses every few meters - ANSWER: Dive only
when your sinuses are healthy and clear
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 - 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 - ANSWER: Boyle
For every meter of depth in freshwater, pressure changes by:
0.013 bar
0.098 bar
0.100 bar
1.03 bar - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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
1.2m
3.5m
4.0m - ANSWER: 1.2m
The recommended method to avoid sinus squeezes and reverse blocks is to:
Ascend and descend slowly to allow gradual equalization
Dive only when your sinuses are healthy and clear
Only use decongestants that do not produce side effects
Forcibly equalize the pressure in your sinuses every few meters - ANSWER: Dive only
when your sinuses are healthy and clear
