SDI Computer Nitrox Test Questions with Correct Answers Latest Update 2025 Graded A+
True - Answers True or False. Oxygen Enriched Air is a term some divers use to refer to Nitrox.
Nitrogen and Oxygen - Answers The air we normally breathe consists primarily of:
Enriched Air, Enriched Air Nitrox, Nitrox, Etc. - Answers A mixture of nitrogen and oxygen in which the
percentage of oxygen is greater than that found in air is generally called:
Blender - Answers The person who creates the Nitrox used to fill scuba cylinders is referred to as a:
EAN21 - Answers Which of the following is not a Nitrox mixture? EAN24, EAN21, EAN40
Longer bottom times and shorter surface intervals - Answers The primary benefits of using Nitrox
include:
150 Minutes or 2.5 hours - Answers During any 24-hour period, you can be exposed to a Nitrox mixture
at its Maximum Operating Depth (MOD) for up to:
False - Answers True or False. Dive computers work by monitoring the presences of so-called 'silent
bubbles using ultrasound.
You may not be able to make a direct ascent to the surface without substantially increasing your risk of
decompression sickness and your dive computer may require you to make a series of decompression
stops - Answers What may happen if you go too deep or stay too long?
Pausing at a fixed depth for a specified period of time to allow excess nitrogen to exit you body more
slowly - Answers A decompression stop is:
Specialized training, Additional equipment, and Topside support - Answers To properly engage in
decompression diving requires:
Nitrogen, ascend - Answers Decompression sickness usually occurs when you have an excess amount of
__________ in your body and you ________ too quickly.
Pain in the joints, Numbness and paralysis, and Loss of balance - Answers The most common symptoms
of decompression sickness can include, but are not limited to:
Administration of pure oxygen - Answers The most important first-aid procedure for a diver suspected of
suffering from decompression sickness is:
Recompression in a hyperbaric chamber - Answers Once a diver suspected of suffering from
decompression sickness has been transported to a medical facility, proper treatment will primarily
involve:
True - Answers True or False. Oxygen Enriched Air is a term some divers use to refer to Nitrox.
Nitrogen and Oxygen - Answers The air we normally breathe consists primarily of:
Enriched Air, Enriched Air Nitrox, Nitrox, Etc. - Answers A mixture of nitrogen and oxygen in which the
percentage of oxygen is greater than that found in air is generally called:
Blender - Answers The person who creates the Nitrox used to fill scuba cylinders is referred to as a:
EAN21 - Answers Which of the following is not a Nitrox mixture? EAN24, EAN21, EAN40
Longer bottom times and shorter surface intervals - Answers The primary benefits of using Nitrox
include:
150 Minutes or 2.5 hours - Answers During any 24-hour period, you can be exposed to a Nitrox mixture
at its Maximum Operating Depth (MOD) for up to:
False - Answers True or False. Dive computers work by monitoring the presences of so-called 'silent
bubbles using ultrasound.
You may not be able to make a direct ascent to the surface without substantially increasing your risk of
decompression sickness and your dive computer may require you to make a series of decompression
stops - Answers What may happen if you go too deep or stay too long?
Pausing at a fixed depth for a specified period of time to allow excess nitrogen to exit you body more
slowly - Answers A decompression stop is:
Specialized training, Additional equipment, and Topside support - Answers To properly engage in
decompression diving requires:
Nitrogen, ascend - Answers Decompression sickness usually occurs when you have an excess amount of
__________ in your body and you ________ too quickly.
Pain in the joints, Numbness and paralysis, and Loss of balance - Answers The most common symptoms
of decompression sickness can include, but are not limited to:
Administration of pure oxygen - Answers The most important first-aid procedure for a diver suspected of
suffering from decompression sickness is:
Recompression in a hyperbaric chamber - Answers Once a diver suspected of suffering from
decompression sickness has been transported to a medical facility, proper treatment will primarily
involve:
