SSI Assistant Instructor Pre Test |QUESTIONS AND ANSWERS |
2025/2026
Assuming a maximum partial pressure limitation of 1.4 bar, 33.7 m
the maximum depth for a 32% nitrox mixture is
_____________________________________________of
seawater.
33.7 m
20 m
66 m
43.7 m
Which physical law states: "If temperature remains Boyle
constant, the pressure and volume of any gas
are inversely related"?
Dalton
Henry
Archimedes
Boyle
Save
For every meter of depth in freshwater, pressure 0.098 bar
changes by:
0.013 bar
0.098 bar
0.100 bar
1.03 bar
diver and his / her equipment weigh 87 kg when neutrally Remove weight
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
,If 2 liters of air are needed in your buoyancy Your positive buoyancy will increase
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
Breathing gas consumption: Increases as depth increases
Varies inversely with depth
Increases as depth increases
Decreases as depth increases
Remains the same as depth increases
The ocean depth at which the partial pressure of 66
oxygen in air equals 1.6 bar is meters assuming
O2 = 21%.
70
85
66
55
Assuming a maximum partial pressure limitation of 1.4 bar, 25 meters
the maximum MOD for a 40% nitrox mixture in the ocean
is:
35 meters
25 meters
40 meters
20 meters
The absolute pressure at a depth of 50 meters in salt 6.000 bar
water is:
5.012 bar
6.000 bar
5.000 bar
5.901 bar
What would be the surface air consumption rate (SAC) of 25 liters / minute
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
If you have difficulty equalizing pressure in your Ascend until the pressure is relieved and then attempt equalization
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
, A lung rupture can occur with over-pressurization in 1.2m
water as shallow as:
5.0m
1.2m
3.5m
4.0m
The recommended method to avoid sinus squeezes and Dive only when your sinuses are healthy and clear
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
The primary symptom of ear squeeze in its initial phase A pressure that will progress to severe pain if equalization is not completed
is: Rapid, shallow, inefficient breathing
Joint and limb pain
A pressure that will progress to severe pain if
equalization is not completed
A pulling sensation in the chest
There are several lung overexpansion injuries that you Air Embolism, Mediastinal Emphysema, Subcutaneous Emphysema, Pneumothorax
should be aware of so that you can avoid them while
diving. These are:
Hypothermia, Hypoxia, Hyperoxia
Decompression Sickness, Arterial Gas Embolism and
rupture of the Oval Window
Decompression Sickness, Barotrauma
Air Embolism, Mediastinal Emphysema, Subcutaneous
Emphysema, Pneumothorax
At sea level, human body tissues are saturated with The partial pressure of the gas in alveolar air
nitrogen at a partial pressure equal to:
The hydrostatic pressure of water at sea
level The partial pressure of the gas in
alveolar air The absolute pressure of air
at sea level
The gauge pressure of the gas in the lungs
A physiological condition called a squeeze occurs when: The pressure on the outside of an closed air space is greater than the internal
The pressure on the inside of an air space is greater pressure
than the external pressure
None of the answers are correct
The pressure on the outside of an closed air space is
greater than the internal pressure
The pressure on the inside of an air space is increasing
to equalize with the external pressure
2025/2026
Assuming a maximum partial pressure limitation of 1.4 bar, 33.7 m
the maximum depth for a 32% nitrox mixture is
_____________________________________________of
seawater.
33.7 m
20 m
66 m
43.7 m
Which physical law states: "If temperature remains Boyle
constant, the pressure and volume of any gas
are inversely related"?
Dalton
Henry
Archimedes
Boyle
Save
For every meter of depth in freshwater, pressure 0.098 bar
changes by:
0.013 bar
0.098 bar
0.100 bar
1.03 bar
diver and his / her equipment weigh 87 kg when neutrally Remove weight
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
,If 2 liters of air are needed in your buoyancy Your positive buoyancy will increase
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
Breathing gas consumption: Increases as depth increases
Varies inversely with depth
Increases as depth increases
Decreases as depth increases
Remains the same as depth increases
The ocean depth at which the partial pressure of 66
oxygen in air equals 1.6 bar is meters assuming
O2 = 21%.
70
85
66
55
Assuming a maximum partial pressure limitation of 1.4 bar, 25 meters
the maximum MOD for a 40% nitrox mixture in the ocean
is:
35 meters
25 meters
40 meters
20 meters
The absolute pressure at a depth of 50 meters in salt 6.000 bar
water is:
5.012 bar
6.000 bar
5.000 bar
5.901 bar
What would be the surface air consumption rate (SAC) of 25 liters / minute
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
If you have difficulty equalizing pressure in your Ascend until the pressure is relieved and then attempt equalization
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
, A lung rupture can occur with over-pressurization in 1.2m
water as shallow as:
5.0m
1.2m
3.5m
4.0m
The recommended method to avoid sinus squeezes and Dive only when your sinuses are healthy and clear
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
The primary symptom of ear squeeze in its initial phase A pressure that will progress to severe pain if equalization is not completed
is: Rapid, shallow, inefficient breathing
Joint and limb pain
A pressure that will progress to severe pain if
equalization is not completed
A pulling sensation in the chest
There are several lung overexpansion injuries that you Air Embolism, Mediastinal Emphysema, Subcutaneous Emphysema, Pneumothorax
should be aware of so that you can avoid them while
diving. These are:
Hypothermia, Hypoxia, Hyperoxia
Decompression Sickness, Arterial Gas Embolism and
rupture of the Oval Window
Decompression Sickness, Barotrauma
Air Embolism, Mediastinal Emphysema, Subcutaneous
Emphysema, Pneumothorax
At sea level, human body tissues are saturated with The partial pressure of the gas in alveolar air
nitrogen at a partial pressure equal to:
The hydrostatic pressure of water at sea
level The partial pressure of the gas in
alveolar air The absolute pressure of air
at sea level
The gauge pressure of the gas in the lungs
A physiological condition called a squeeze occurs when: The pressure on the outside of an closed air space is greater than the internal
The pressure on the inside of an air space is greater pressure
than the external pressure
None of the answers are correct
The pressure on the outside of an closed air space is
greater than the internal pressure
The pressure on the inside of an air space is increasing
to equalize with the external pressure
