NITROX CERTIFICATION EXAM
QUESTIONS WITH CORRECT
ANSWERS
What are the common terms divers may use when referring to Nitrox? - Correct
Answers --In all likelihood, you have also heard it referred to by a variety of names:
enriched air, oxygen enriched air, SafeAir®, Denitrogenated Air®, EAN, EANx, NOAA
Nitrox I or NOAA Nitrox II.
What are the primary component gasses found in air, and the percentage of the total
gas mixture each gas represents? - Correct Answers -- However, unlike air which
normally contains approximately 79 percent nitrogen and 21 percent oxygen, Nitrox
contains a higher percentage of oxygen.
What does term Nitrox mean? - Correct Answers --Nitrox a mix of nitrogen and oxygen
just like air.
What do divers commonly call a person who creates the Nitrox used to fill scuba
cylinders? - Correct Answers --Blender
What are some of the common Nitrox mixtures used by divers? - Correct Answers -22-
40 percent mixture
-EAN32: 68 percent nitrogen, 32 percent oxygen.
-EAN36: 64 percent nitrogen, 36 percent oxygen.
What are the two primary benefits divers enjoy by using Nitrox? - Correct Answers --The
first is that you can increase your maximum allowable bottom time. This happens
because the extra oxygen added to your breathing gas when it was filled has displaced
nitrogen. Because there is less nitrogen in the mix to be absorbed by your body you can
spend longer at depth before you reach the nitrogen limit - which is the decompression
limit.
-Secondly, since you are absorbing less nitrogen on a given dive, your surface intervals
can usually be shortened.
Additional steps Nitrox divers can take to help avoid oxygen toxicity include all of the
following except: - Correct Answers -Never exceed a PO2 of 2.0.
, What is the recommended surface interval after extended dives with Nitrox? - Correct
Answers -120 min
What are the two gases that most Nitrox diving computers take into consideration when
computing your allowable bottom time? - Correct Answers -Nitrogen and oxygen.
State how long, in any 24-hour period, you can be exposed to a Nitrox mixture at its
Maximum Operating Depth (MOD)? - Correct Answers --Also, over the course of a 24-
hour period, you will have a cumulative time limit for oxygen exposure at the maximum
operating depth of two and a half hours in any 24-hour period.
How can a dive computer help you avoid decompression sickness? - Correct Answers --
When you use a dive computer, it will calculate approximately the amount of nitrogen
absorbed by your body, and indicates when it is time to ascend and the rate at which it
is safest to ascend.
What may happen if you go too deep or stay too long during a dive? - Correct Answers -
-However, if your dive lasted for a long time, or you made a deep dive, the dive
computer will indicate that you must stop at a particular depth to allow the excess
nitrogen in your body time to escape without causing problems. Your computer may
require you to make one stop or a series of stops, commonly known as decompression
stops.
What does the term decompression stop mean? - Correct Answers --During these
decompression stops, the excess nitrogen in your body is carried back to the lungs
where you exhale it each time you breathe.
What are three reasons why sport divers should avoid decompression diving? - Correct
Answers --sport divers should avoid decompression diving by using their dive
computers to plan their dives, and carefully monitoring their computers during dives.
What is the primary cause of decompression sickness? - Correct Answers --
Decompression sickness usually occurs when you have an excess amount of nitrogen
in your body and you ascend too quickly. The nitrogen comes out of a solution and
forms a bubble thus disrupting the flow of blood in whatever part of the body it is
located.
What are the most common symptoms of decompression sickness? - Correct Answers -
-The most common symptoms include, but are not limited to, pain in the joints,
numbness, paralysis, loss of balance, muscle weakness, and impaired thinking.
What is the recommended first aid for decompression sickness? - Correct Answers --
First aid for decompression sickness includes treating the diver for shock by laying them
down and keeping them either from being to cold or too warm. However the most
important thing to do is provide an injured diver pure oxygen as soon as possible and
QUESTIONS WITH CORRECT
ANSWERS
What are the common terms divers may use when referring to Nitrox? - Correct
Answers --In all likelihood, you have also heard it referred to by a variety of names:
enriched air, oxygen enriched air, SafeAir®, Denitrogenated Air®, EAN, EANx, NOAA
Nitrox I or NOAA Nitrox II.
What are the primary component gasses found in air, and the percentage of the total
gas mixture each gas represents? - Correct Answers -- However, unlike air which
normally contains approximately 79 percent nitrogen and 21 percent oxygen, Nitrox
contains a higher percentage of oxygen.
What does term Nitrox mean? - Correct Answers --Nitrox a mix of nitrogen and oxygen
just like air.
What do divers commonly call a person who creates the Nitrox used to fill scuba
cylinders? - Correct Answers --Blender
What are some of the common Nitrox mixtures used by divers? - Correct Answers -22-
40 percent mixture
-EAN32: 68 percent nitrogen, 32 percent oxygen.
-EAN36: 64 percent nitrogen, 36 percent oxygen.
What are the two primary benefits divers enjoy by using Nitrox? - Correct Answers --The
first is that you can increase your maximum allowable bottom time. This happens
because the extra oxygen added to your breathing gas when it was filled has displaced
nitrogen. Because there is less nitrogen in the mix to be absorbed by your body you can
spend longer at depth before you reach the nitrogen limit - which is the decompression
limit.
-Secondly, since you are absorbing less nitrogen on a given dive, your surface intervals
can usually be shortened.
Additional steps Nitrox divers can take to help avoid oxygen toxicity include all of the
following except: - Correct Answers -Never exceed a PO2 of 2.0.
, What is the recommended surface interval after extended dives with Nitrox? - Correct
Answers -120 min
What are the two gases that most Nitrox diving computers take into consideration when
computing your allowable bottom time? - Correct Answers -Nitrogen and oxygen.
State how long, in any 24-hour period, you can be exposed to a Nitrox mixture at its
Maximum Operating Depth (MOD)? - Correct Answers --Also, over the course of a 24-
hour period, you will have a cumulative time limit for oxygen exposure at the maximum
operating depth of two and a half hours in any 24-hour period.
How can a dive computer help you avoid decompression sickness? - Correct Answers --
When you use a dive computer, it will calculate approximately the amount of nitrogen
absorbed by your body, and indicates when it is time to ascend and the rate at which it
is safest to ascend.
What may happen if you go too deep or stay too long during a dive? - Correct Answers -
-However, if your dive lasted for a long time, or you made a deep dive, the dive
computer will indicate that you must stop at a particular depth to allow the excess
nitrogen in your body time to escape without causing problems. Your computer may
require you to make one stop or a series of stops, commonly known as decompression
stops.
What does the term decompression stop mean? - Correct Answers --During these
decompression stops, the excess nitrogen in your body is carried back to the lungs
where you exhale it each time you breathe.
What are three reasons why sport divers should avoid decompression diving? - Correct
Answers --sport divers should avoid decompression diving by using their dive
computers to plan their dives, and carefully monitoring their computers during dives.
What is the primary cause of decompression sickness? - Correct Answers --
Decompression sickness usually occurs when you have an excess amount of nitrogen
in your body and you ascend too quickly. The nitrogen comes out of a solution and
forms a bubble thus disrupting the flow of blood in whatever part of the body it is
located.
What are the most common symptoms of decompression sickness? - Correct Answers -
-The most common symptoms include, but are not limited to, pain in the joints,
numbness, paralysis, loss of balance, muscle weakness, and impaired thinking.
What is the recommended first aid for decompression sickness? - Correct Answers --
First aid for decompression sickness includes treating the diver for shock by laying them
down and keeping them either from being to cold or too warm. However the most
important thing to do is provide an injured diver pure oxygen as soon as possible and
