Test - how good is your knowledge really?

Below you will find 20 questions, selected randomly from our database. Choose the best answer to each of the questions. Once you answered all questions, enter your first name and your email address. You receive the score for all questions, and – if you should have mistakes – the correct answers by email.

Question	Options	Answer
According to which principle is the Capillary depth gauge working?	A: The principle of Archimedes B: The principle of Boyle C: The principle of Charles D: The principle of Dalton	?ABCD
At which depth is the partial pressure of oxygen in air 1.6 bar and consequently starts the risk of convulsions without warning?	A: 100 meters B: 40 meters C: 70 meters D: 66 meters	?ABCD
What is meant by an “open circuit” regulator?	A: The exhaled air goes out into the water B: The air is delivered with surrounding pressure C: In the case of a malfunction the regulator stops giving air D: In case of a malfunction the regulator begins to free-flow	?ABCD
A 5 minute compartment has reached (approached) the equilibrium with the surrounding pressure, in ______ minutes after arriving in an environment with a different pressure.	A: 5 minutes (because it is the 5 minute compartment) B: 30 minutes (because there are 6 periods) C: 70 minutes (because the RDP has 14 compartments) D: 10 minutes (because that completes 2 halftimes ½ + ½ = 1 complete)	?ABCD
If you equalize to strong using the valsalva method, you risk:	A: a ruptured eardrum. B: a lung over expansion injury. C: an round window rupture. D: an oval window rupture.	?ABCD
Which depth gauge can you use at altitude with the RDP without having to recalculate?	A: Bourdon tube depth gauge B: Capillary depth gauge C: None D: A and B are correct	?ABCD
Under water, you loose body-temperature ____ faster than with the same ambient temperature in air.	A: 5 times B: 10 times C: 15 times D: 20 times	?ABCD
A 12 liter scuba cylinder is filled at 200 bar at a temperature of 61 °C. Over night, the temperature drops to 11 °C. What is the pressure of the cylinder now?	A: 150 bar B: 170 bar C: 230 bar D: 235 bar	?ABCD
What is an “environmental seal”?	A: A part screwed on to the first stage to prevent it from freezing up B: Silicone oil in the first stage to prevent it from freezing up C: An octopus holder that avoids the octopus from hanging around D: A and B are correct	?ABCD
What is the physiological consequence from excessive hyper ventilation?	A: The carbon monoxide level is decreased so much that the breathing impulse is delayed too long B: The carbon dioxide level is decreased so much that the breathing impulse is delayed too long C: The oxygen level is so high that the body don’t get the breathing impulse D: There are no consequences since the body will solve all problems	?ABCD
What have the biggest influence on tides?	A: The gravity from the sun B: The gravity from the sun and the moon C: Storms and hurricanes around the world D: Currents and topography of the oceans	?ABCD
If a scuba cylinder contains 20 % of oxygen at the surface, what is the oxygen percentage at a depth of 30 meters?	A: 60% B: 80% C: 5% D: The same as at the surface	?ABCD
What is approx. the partial presure of oxygen at 50 meters.	A: 20% B: 100% C: 0.2 bar D: 1.2 bar	?ABCD
What is the difference between steel and aluminum cylinders?	A: The inner volume of a steel cylinder is bigger compared to the outer volume B: The walls of a steel cylinder is thinner C: When diving with an aluminum cylinder you need more weight D: All of the above answers are correct	?ABCD
You can not change pressure groups between:	A: the US Navy table and the RDP wheel. B: the Enriched Air RDPs and the RDP wheel. C: the RDP table and the RDP wheel. D: the Enriched Air RDPs and the RDP table	?ABCD
A diver is coming to you with a regulator which is mildly free-flowing from the second stage. You shortly push the purge button and the problem is solved, but already one minute later, the regulator starts to free flow again. How can this problem be solved?	A: The lever in the second stage has to be bended away from the membrane. B: The second stage has to be filled with silicone spray to reduce friction. C: The lever of the second stage has to be adjusted. D: The high pressure seat in the first stage has to be exchanged.	?ABCD
Why is a visual inspection recommended for scuba cylinders?	A: to identify if the inner wall has corrosion. B: to identify if the outside of the cylinder is damaged or has corrosion. C: to inspect the treads where the valve is fitted. D: All of the above.	?ABCD
The person who is credited for creating the first dive tables and developed the mathematical model, which is still used today for tables and divecomputers (with modifications) is called:	A: Haldane B: Boyle C: Henry D: Bühlmann	?ABCD
A diver starts at 9.00 hr in the morning and plans an intensive day of diving. 4 dives will be made, using the following profiles: 1st dive – 17 meters for 56 minutes. After a 1hr 24 minute surface interval a 2nd dive to 17 meters during 38 minutes. Between the next dives the diver makes the surface intervals as short as allowed. The 3rd dive goes to 14 meters during 63 minutes. How long can a 4th dive to 14 meters be and what is the total number of safety stops the diver is required to make this day? Use the RDP table version for this question.	A: 61 minutes, 3 stops. B: 8 minutes, 4 stops. C: 90 minutes, 4 stops. D: PADI standards only allow 3 dives a day and this not in an entry level course.	?ABCD
The sign and symptoms of Nitrogen narcosis could include _____and would normally subside when the diver______:	A: Euphoria / ascents to a shallower depth B: Euphoria / descents deeper C: Anxiety / is placed in a recompression chamber D: Anxiety / descents deeper	?ABCD
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