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
The most accurate method for measuring distance under water is:	A: armspans. B: kick cycles. C: time and air consumption. D: a measurement tape.	?ABCD
What is meant by “fail-safe”?	A: The exhale air goes out into the water B: The air is delivered with surrounding pressure C: In the case of an malfunction the regulator stops giving air D: In case of an malfunction the regulator begins to free-flow	?ABCD
According to which law should a depth gauge work upon if it should give the theoretical depth when diving at altitudes above 300 meters?	A: Henry B: Boyle C: Dalton D: Charles	?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
If a balloon with a volume of 8 liter is brought from 10 meters depth to a depth of 30 meters, what would be the new volume?	A: 2 liter B: 4 liter C: 12 liter D: 18 liter	?ABCD
If a balloon with a volume of 4.5 liter is brought from 14 meters depth to a depth of 37 meters, what would be the new volume?	A: 2.3 liter B: 8.8 liter C: 4.5 liter D: 2.1 liter	?ABCD
In a balanced regulator:	A: the opening of the high pressure seat is not assisted or restricted by the pressure in the cylinder. B: the intermediate pressure is higher than 12 bar. C: the intermediate pressure stays the same, regardless of depth. D: None of the above.	?ABCD
If breathing 1% carbonmonoxide (CO) at a depth of 30 meters, the percentage of carbonmonoxide of this gas would be ____ % at the surface.	A: 1 B: 2 C: 3 D: 4	?ABCD
A diver arriving at a dive site with unfamiliar conditions, should participate in _________, regardless the certification level of the diver:	A: Scuba Review B: Scuba Tune-up Program C: Discover Local Diving D: Discover Scuba Diving	?ABCD
A 10 liter scuba cylinder is filled at 205 bar at a temperature of 14 °C. Left in a car in the sun, the temperature rises to 82 °C. What is the pressure of the cylinder now?	A: 240.8 bar B: 253.6 bar C: 159.2 bar D: 165.7 bar	?ABCD
What is the percentage of oxygen in air at a depth of 20 meters?	A: 63 % B: 42 % C: 40 % D: 21 %	?ABCD
Compared to a steel cylinder, an aluminum cylinder has:	A: thicker walls. B: a smaller inner volume, compared to the outer volume. C: less risk of corrosion. D: All of the above.	?ABCD
How many compartments is the PADI RDP using to calculate surface intervals?	A: One compartment B: Six compartments C: Fourteen compartments D: That depends on the controlling compartment from the dive	?ABCD
For calculating the RDP, 14 theoretical compartments were used, which is ___ more than the US Navy used to create their tables	A: 6 B: 8 C: 9 D: It was the US Navy that used more compartments.	?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
It is recommended that you do a safety stop of 3 minutes at 5 meters at the end of your dive to:	A: Exhale as much CO2 as possible B: Exhale as much CO as possible C: Exhale as much O2 as possible D: Exhale as much N2 as possible	?ABCD
During a night dive each diver should at least have:	A: One primary light B: One primary light and one backup light C: One primary light and two backup lights D: One primary light, one backup light and one chemical light-stick	?ABCD
A cylinder is filled to a pressure of 205 bar and reaches a temperature of 71 °C. This cylinder is then taken to an environment with a temperature of 4 °C. What will be the new pressure?	A: 245 bar B: 175 bar C: 255 bar D: 165 bar	?ABCD
Which barotrauma is most dangerous?	A: Air accumulating at the neck B: Air accumulating in the area around the heart C: Air in the pleural cavity D: Air bubbles in the Arteries	?ABCD
An object of 473 kilo is laying in the sea at 22 meters depth. The object displaces 311,5 liters of water. How much air do you have fill in a liftbag to make the object neutrally buoyant? (round to 1 decimal)	A: 147.7 liters B: 472.7 barliter C: 152.2 liters D: Both answer A and B are correct.	?ABCD
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