SDI Computer Nitrox Test Questions with
Answers Graded A
True or False. Oxygen Enriched Air is a term some divers use to refer to Nitrox. - Ans -
True
The air we normally breathe consists primarily of: - Ans -Nitrogen and Oxygen
A mixture of nitrogen and oxygen in which the percentage of oxygen is greater than that
found in air is generally called: - Ans -Enriched Air, Enriched Air Nitrox, Nitrox, Etc.
The person who creates the Nitrox used to fill scuba cylinders is referred to as a: -
Ans -Blender
Which of the following is not a Nitrox mixture? EAN24, EAN21, EAN40 - Ans -EAN21
The primary benefits of using Nitrox include: - Ans -Longer bottom times and shorter
surface intervals
During any 24-hour period, you can be exposed to a Nitrox mixture at its Maximum
Operating Depth (MOD) for up to: - Ans -150 Minutes or 2.5 hours
True or False. Dive computers work by monitoring the presences of so-called 'silent
bubbles using ultrasound. - Ans -False
What may happen if you go too deep or stay too long? - Ans -You may not be able to
make a direct ascent to the surface without substantially increasing your risk of
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Page
, decompression sickness and your dive computer may require you to make a series of
decompression stops
A decompression stop is: - Ans -Pausing at a fixed depth for a specified period of time
to allow excess nitrogen to exit you body more slowly
To properly engage in decompression diving requires: - Ans -Specialized training,
Additional equipment, and Topside support
Decompression sickness usually occurs when you have an excess amount of __________ in
your body and you ________ too quickly. - Ans -Nitrogen, ascend
The most common symptoms of decompression sickness can include, but are not limited
to: - Ans -Pain in the joints, Numbness and paralysis, and Loss of balance
The most important first-aid procedure for a diver suspected of suffering from
decompression sickness is: - Ans -Administration of pure oxygen
Once a diver suspected of suffering from decompression sickness has been transported to
a medical facility, proper treatment will primarily involve: - Ans -Recompression in a
hyperbaric chamber
What is the minimum concentration of oxygen required to maintain consciousness at sea
level? - Ans -16 percent
The maximum percentage of oxygen that sport divers use in a Nitrox mixture is: - Ans -
40 percent
2
Page
Answers Graded A
True or False. Oxygen Enriched Air is a term some divers use to refer to Nitrox. - Ans -
True
The air we normally breathe consists primarily of: - Ans -Nitrogen and Oxygen
A mixture of nitrogen and oxygen in which the percentage of oxygen is greater than that
found in air is generally called: - Ans -Enriched Air, Enriched Air Nitrox, Nitrox, Etc.
The person who creates the Nitrox used to fill scuba cylinders is referred to as a: -
Ans -Blender
Which of the following is not a Nitrox mixture? EAN24, EAN21, EAN40 - Ans -EAN21
The primary benefits of using Nitrox include: - Ans -Longer bottom times and shorter
surface intervals
During any 24-hour period, you can be exposed to a Nitrox mixture at its Maximum
Operating Depth (MOD) for up to: - Ans -150 Minutes or 2.5 hours
True or False. Dive computers work by monitoring the presences of so-called 'silent
bubbles using ultrasound. - Ans -False
What may happen if you go too deep or stay too long? - Ans -You may not be able to
make a direct ascent to the surface without substantially increasing your risk of
1
Page
, decompression sickness and your dive computer may require you to make a series of
decompression stops
A decompression stop is: - Ans -Pausing at a fixed depth for a specified period of time
to allow excess nitrogen to exit you body more slowly
To properly engage in decompression diving requires: - Ans -Specialized training,
Additional equipment, and Topside support
Decompression sickness usually occurs when you have an excess amount of __________ in
your body and you ________ too quickly. - Ans -Nitrogen, ascend
The most common symptoms of decompression sickness can include, but are not limited
to: - Ans -Pain in the joints, Numbness and paralysis, and Loss of balance
The most important first-aid procedure for a diver suspected of suffering from
decompression sickness is: - Ans -Administration of pure oxygen
Once a diver suspected of suffering from decompression sickness has been transported to
a medical facility, proper treatment will primarily involve: - Ans -Recompression in a
hyperbaric chamber
What is the minimum concentration of oxygen required to maintain consciousness at sea
level? - Ans -16 percent
The maximum percentage of oxygen that sport divers use in a Nitrox mixture is: - Ans -
40 percent
2
Page
