PADI OPEN WATER FINAL EXAM A COMPLETE
STUDY GUIDE 2026
◉ As you descend in water, the pressure. Answer: increases
◉ A depth change of 10 metres/33 feet causes a pressure change of.
Answer: 1 bar/ata (atmosphere)
◉ if you take 6 liters of air from the surface to 20 metres/66 feet, the
volume will be. Answer: 2 litres (the density of the air would be
three times the density at the surface)
◉ A balloon fully inflated and sealed at 10 metres/33 feet, would
probably ______ during ascent to the surface. Answer: burst
◉ A squeeze is caused by. Answer: a pressure imbalance between
the surrounding pressure and an air space
◉ Equalization is the process of. Answer: adding air to an air space
◉ The most important rule in scuba diving is to. Answer: breathe
continuously and never hold your breath
,◉ During ascent I feel discomfort in my ears. I should. Answer: stop,
descend slightly, and allow trapped air to work its way out
◉ My buddy and I descend to 12 metres/40 feet. I would expect to
use my air _____ at 6 metres/20 feet. Answer: faster than
◉ The most efficient way to breathe dense air underwater is to
breathe. Answer: deeply and slowly
◉ Buoyancy. Answer: a force that pushes an object in water upward
◉ Salt water causes more buoyancy than fresh water because it is
_____ dense and weighs _____. Answer: more
◉ When I descend, my buoyancy tends to ________. When I ascend, it
tends to _______. Answer: decrease, increase
◉ The three most important considerations in choosing scuba
equipment are suitability, fit, and. Answer: comfort
◉ The two basic fin styles are __________ fins. Answer: adjustable and
full-foot
, ◉ My primary considerations when choosing fins are fit and.
Answer: blade size
◉ BCD (buoyancy control device). Answer: holds your kit together
and allows you to adjust buoyancy throughout the dive
◉ Regulator. Answer: delivers breathing air at the surrounding
pressure when you inhale and directs exhaled air into the air
◉ Cylinder. Answer: holds the high-pressure breathing air supplied
by your regulator during the dive
◉ Weight System. Answer: holds lead weight to counteract the
positive buoyancy of your body and some of your equipment, with a
mechanism for dropping some or all the weight in an emergency
◉ The five components that make up a BCD include. Answer: an
inflatable bladder, a cylinder band and harness/jacket, an LPI (low-
pressure inflator) mechanism, an overpressure/quick exhaust
valves, and a weight system
◉ LPI mechanism. Answer: inflates the BCD with air from my scuba
cylinder
STUDY GUIDE 2026
◉ As you descend in water, the pressure. Answer: increases
◉ A depth change of 10 metres/33 feet causes a pressure change of.
Answer: 1 bar/ata (atmosphere)
◉ if you take 6 liters of air from the surface to 20 metres/66 feet, the
volume will be. Answer: 2 litres (the density of the air would be
three times the density at the surface)
◉ A balloon fully inflated and sealed at 10 metres/33 feet, would
probably ______ during ascent to the surface. Answer: burst
◉ A squeeze is caused by. Answer: a pressure imbalance between
the surrounding pressure and an air space
◉ Equalization is the process of. Answer: adding air to an air space
◉ The most important rule in scuba diving is to. Answer: breathe
continuously and never hold your breath
,◉ During ascent I feel discomfort in my ears. I should. Answer: stop,
descend slightly, and allow trapped air to work its way out
◉ My buddy and I descend to 12 metres/40 feet. I would expect to
use my air _____ at 6 metres/20 feet. Answer: faster than
◉ The most efficient way to breathe dense air underwater is to
breathe. Answer: deeply and slowly
◉ Buoyancy. Answer: a force that pushes an object in water upward
◉ Salt water causes more buoyancy than fresh water because it is
_____ dense and weighs _____. Answer: more
◉ When I descend, my buoyancy tends to ________. When I ascend, it
tends to _______. Answer: decrease, increase
◉ The three most important considerations in choosing scuba
equipment are suitability, fit, and. Answer: comfort
◉ The two basic fin styles are __________ fins. Answer: adjustable and
full-foot
, ◉ My primary considerations when choosing fins are fit and.
Answer: blade size
◉ BCD (buoyancy control device). Answer: holds your kit together
and allows you to adjust buoyancy throughout the dive
◉ Regulator. Answer: delivers breathing air at the surrounding
pressure when you inhale and directs exhaled air into the air
◉ Cylinder. Answer: holds the high-pressure breathing air supplied
by your regulator during the dive
◉ Weight System. Answer: holds lead weight to counteract the
positive buoyancy of your body and some of your equipment, with a
mechanism for dropping some or all the weight in an emergency
◉ The five components that make up a BCD include. Answer: an
inflatable bladder, a cylinder band and harness/jacket, an LPI (low-
pressure inflator) mechanism, an overpressure/quick exhaust
valves, and a weight system
◉ LPI mechanism. Answer: inflates the BCD with air from my scuba
cylinder
