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1.Nitrogen narcosis most commonly happens at a depth of 18 meters/60 feet.
A. TRUE
B. FALSE
Answer: B
2.What would happen to a balloon that is filled with air at 10meters/33 feet if you bring it
to the surface?
A. The balloon will shrink to half its original size and the density of the air will decrease by
half.
B. The balloon will expand to twice its size and the density of the air will decrease by half.
C. The balloon will shrink to half its original size and the density of the air will increase by
a factor of 2.
D. The balloon will expand to twice its size and the air density will increase by a factor of
2.
Answer: B
Feedback:
For all intents and purposes you cannot compress a liquid or a solid by applying greater
pressure, but you can compress a gas as the molecules are further apart.
Boyle’s Law states that the volume of a gas is inversely proportional to the surrounding
pressure on the gas.
With Density it’s all the other way around because as you squash the gas the deeper you
go and make its volume smaller you increase its density – if the gas expands (when
going up) then you decrease its density. What does this mean?
When calculating densities you divide when you go up and multiply when you go down.
The opposite of calculating volumes. This comes into effect when calculating air
consumption.
In this case, we start at 10 meters/33 feet, or 2 ata. This means that the volume of air in
the balloon at 2 ata is decreased by 2 times would it would be at the surface. Inversely, at
the surface the air volume will increase by 2 times, expanding the balloon. The density is
greater at depth, but will decrease when it goes up. So the balloon filled with air will
expand at the surface and the density of the air will decrease.
The correct answer is: The balloon will expand to twice its size and the density of the air
will decrease by half.
3.If you took a glass filled with air and you took it down to 10 meters/33 feet, what would
happen to the volume of air in the glass?
A. The volume would be reduced by half of what it was on the surface
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B. The volume would be increased by 3 times what it was on the surface
C. The volume would be reduced by 3 times what it was on the surface
D. The volume would be increased by 2 times what it was on the surface
Answer: A
4.The best thing you can do if you are close to your buddy and you run out of air is to:
A. Switch to your own alternate air source (octopus)
B. Perform a CESA, making sure that you make a continuous Ahhhh sound on the way
up
C. Use your buddy's alternate air source
D. Get rid of your weights and ascend to the surface
Answer: C
Feedback:
Keep in mind, if you run out of air, then switching to your octopus will not do any good
because you are out of air. The octopus is hooked into your tank which is out of air.
The correct answer is: use your buddy's alternate air source
5.If the air in your tank lets you breath for 30 minutes at the surface, then the same tank
of air would last for 15 minutes at a depth of 20 meters/65 feet.
A. TRUE
B. FALSE
Answer: B
Feedback:
If you know your air consumption at the surface, in this case your air lasts 30 minutes,
then it's easy to calculate how long your air will last at a certain depth.
If you descend to 20 meters/65 feet and you are breathing normally, then you are now
breathing air at 3 ata or 1/3 of what you were at the surface. In this case, if you started
with 30 minutes at the surface, then 1/3rd of 30 minutes would be 10 minutes. This
means that with the same tank of air, you would be able to breath for 10 minutes at 20
meters/65 feet.
If you know your air consumption at the surface, in this case your air lasts 30 minutes,
then it's easy to calculate how long your air will last at a certain depth.
If you descend to 20 meters/65 feet and you are breathing normally, then you are now
breathing air at 3 ata or 1/3 of what you were at the surface. In this case, if you started
with 30 minutes at the surface, then 1/3rd of 30 minutes would be 10 minutes. This
means that with the same tank of air, you would be able to breath for 10 minutes at 20
meters/65 feet.
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The correct answer is 'False'.
6.If you find yourself separated from your buddy, the best course of action to take is to
ascend to the surface and check if they are at the surface, if not, descend and perform a
search pattern.
A. TRUE
B. FALSE
Answer: B
7.You do a dive to 18 meters/59 feet for 27 minutes. After a 43 minute surface interval,
you want to do another dive to 17 meters/56 feet.
What is the maximum allowable time for the second dive?
A. Metric - 37 minutes, or Imperial - 29 minutes
B. Metric - 40 minutes, or Imperial - 39 minutes
C. Metric - 16 minutes, or Imperial - 14 minutes
D. Metric - 53 minutes, or Imperial - 61 minutes
Answer: B
8.Which of the following allows the regulator to be screwed directly into the tank valve?
A. Dual tank manifold
B. K valve
C. DIN
D. Yoke screw
Answer: C
9.If you see a diver at the surface making rapid movements and their mask is off their
head, they are most likely a little tired and they trying to exit the water.
A. TRUE
B. FALSE
Answer: B
10.One great way to save air while scuba diving is to move quickly, but efficiently.
A. True
B. False
Answer: B.
Feedback:
A great strategy for conserving air is to move slowly and efficiently. Moving quickly will
take more air and will make you more tireD.
The correct answer is 'False'.
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