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PADI Open Water Diver Final Exam ( 2026/2027 Update) Questions and Answers with Rationales
PADI Open Water Diver Final Exam (
2026/2027 Update) Questions and
Answers with Rationales
Q: The best place for me to position an alternate air source is
A loose by my side so I can find it fast.
B in the triangle area formed by my chin and the lower corners of my rib cage.
C to the base of my cylinder.
D to the back of my BCD between my shoulder blades and waist.
Answer:
B In the triangle area formed by my chin and the lower corners of my rib cage.
Your alternate air source attaches with a quick release in the triangle area formed by your chin
and the lower corners of your rib cage. Avoid letting your alternate air source dangle unsecured
from your kit.
See Equipment I - Regulators.
Q: Lung overexpansion injuries can be caused by
A scuba diving without a buddy.
B continuing a dive when not properly weighted.
C not drinking enough water before scuba diving.
D holding my breath while scuba diving.
Answer:
D Holding my breath while scuba diving.
Blocking off your lungs by holding your breath and ascending could cause them to overexpand
and rupture, which is a serious injury that could result in paralysis and death. Breathing
continuously while scuba diving keeps air passages open allowing expanding air to escape.
See Being a Diver I - The Effects of Decreasing Pressure on Body Air Spaces.
Q: If my cylinder of air lasts 60 minutes while I am at the surface breathing normally,
assuming all else is the same, how long will it last at 20 meters breathing normally?
A 60 minutes
B 20 minutes
C 15 minutes
D 12 minutes
Answer:
B 20 minutes
60/3=20
For each 10 meters we go down, we have one more atmosphere of pressure. Also, remember to
add in the 1 atmosphere of pressure at the surface.
So, going down to 20 meters, we will have 2 atm + 1 atm = 3 atm of pressure.
Q: How often should I take my scuba cylinder to be visually inspected by my dive center?
A Once a year.
B Once every two years.
C Every six months.
D Every five years.
Answer:
A Once a year.
Have your cylinder visually inspected annually for internal corrosion or other
contamination/damage.
See Equipment I - Cylinders.
Q: The difference between DIN valves and yoke valves is that DIN valves
A are made from durable plastic.
B contain a spring-ope shutoff valve that is held open by cylinder pressure.
C have an o-ring in them.
D have threaded openings to screw the regulator into.
Answer:
D Have threaded openings to screw the regulator into.
With the DIN system, the regulator screws into the valve. The yoke system holds the regulator
first stage to the cylinder with a clamp system.
See Equipment I - Cylinders.
Q: Which of the following is part of proper care for my scuba cylinder?
A Sand and repaint it every year.
B Dry it in the sun.
C Keep some air in it.
D Have it pressure tested every month.
Answer:
C Keep some air in it.
You should keep some air in the cylinder to prevent moisture from entering and causing
corrosion. Also, have it pressure tested at required intervals, usually two to five years. Have it
visually inspected annually. Store it standing in a safe place and keep it away from high heat.
See Equipment I - Cylinder Care.
Q: Refer to the regulator picture. Each regulator part has a number next to it. Please choose the
correct number for the choices below.
regulator first stage,
regulator second stage
alternate air source second stage
low pressure inflator hose for the BCD
instrument console/gauges/computer
Answer:
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