1. Normal air contains how much nitrogen?

21 %
69 %
77 %
79 %

2. The common abbreviation for enriched air is ________?

NITROX
EANx
NTX
TriM

3. The advantage to Nitrox versus normal air diving is ________?

allows deeper dives
it is less expensive
allows for greater bottom time at medium depth ranges
it is safer in all aspects

4. NOAA Nitox I refers to gas with what percentage oxygen?

32 %
36 %
40 %
1 %

5. NOAA Nitox II refers to gas with what percentage oxygen?

32 %
36 %
40 %
2 %

6. The primary danger in using Nitrox is _________?

nitrogen narcosis
decompression sickness
oxygen toxicity
anemia

7. NOAA stands for _____?

National Oceans Administrative Agency
National Oceanic and Atmospheric Administration
National Oxygen Administrative Association
National Oxygen Air Association

8. EANx32 has ________ EANx36.

a higher gauge pressure than
the same oxygen percentage as
higher oxygen percentage than
lower oxygen percentage than

9. Nitrox tanks must have a  _________?

green or green and yellow sticker saying "Enriched Air."
white sticker saying "Enriched Air."
orange or orange and black sticker saying "Enriched Air."
black or black and blue sticker saying "Enriched Air."

10. The primary body of data upon which present oxygen limits are based was collected by _______?

Niels Bohr
Sir Hubert Wilkins
Wilhem Rontgen
Ken Donald