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30m Diver quiz:

01- What is the composition of the air?

21% oxygen and 79% nitrogen.
50% oxygen and 50% nitrogen.
79% oxygen and 21% nitrogen.

02- How to calculate the partial pressure of a gaz?

This is very complicate to calculate.
Simply multiply the pressure by the gaz percentage.
The partial pressure is always 1 bar.

03- What are the signs and symptoms of the nitrogen narcosis?

Convulsions due to the high partial pressure of oxygen.
A lack of attention or a foolish behavior due to the high partial pressure of nitrogen.
Localized pain, tingling and numbness due to the formation of bubbles in our body.

04- What to do if you have the nitrogen narcosis?

Stop drinking alcohol.
There's nothing much you can do.
Simply ascend as much as necessary in order to stop the narcosis.

05- What is the density of the air we breath at 30 meters depth?

The density is the same than at the surface.
The density is three times denser than at the surface.
The density is four times denser than at the surface.

06- How long will last your scuba tank at 30 meters if you empty it in 48 minutes at 10 meters?

24 minutes.
32 minutes.
48 minutes.

07- Is it easy to recover if you get exhausted at 30 meters depth?

Yes, no problem.
No, this might be difficult.
I don't know.

08- What is the recommendation of IFDI?

Monitor regularly your diving computer and avoid the dives with decompression stop.
You must plan dives with decompression stop.
You must stay dry. You must not dive.

09- What is a multilevel dive?

A dive where we ascend progressively in order to dive longer time and to avoid the decompression stop.
A dive where we stay deep and where we ascend straight to the depth of 5 meters.
A dive where we descend progressively.

10- What's the benefit of a multilevel dive?

This has no particular benefit.
We can get out of the water faster.
We manage to dive deeply and long time, safely.

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