PADI, Open Water Diver, Final Exam
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D float.
ii
Salt water is heavier than fresh water because it has dissolved minerals in it. This means it
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causes more upward force (buoyancy) on an object. An object that is neutrally buoyant in
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fresh water would float in salt water because there is greater upward force.
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See Being a Diver I - Buoyancy and Controlling Buoyancy. - 1) If an object is neutrally
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buoyant (does not sink or float) in fresh water, the same object placed into salt water would
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A sink.
ii
B either sink or float.
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C do nothing.
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D float.
ii
B The balloon will get smaller and the air inside the balloon will be more dense (molecules
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move closer together).
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As water pressure increases, the volume of an air space will decrease. This causes the
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density of the air inside to increase and air molecules are pushed closer together. The
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balloon would get smaller and the air density inside would be greater.
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See Being a Diver I - Water Pressure and Air Volume Effects. - 2) I blow up a balloon, tie it
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off, and take it to the bottom of the swimming pool. What will happen to the balloon and the
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air inside it?
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A The balloon will get bigger and the air inside the balloon will be less dense (molecules
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move further apart).
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B The balloon will get smaller and the air inside the balloon will be more dense (molecules
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move closer together).
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C The balloon will get bigger and the air inside the balloon will be more dense.
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D The balloon will get smaller and the air inside the balloon will be less dense.
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ii A become half the size it was at the surface.
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At 10 meters, the pressure is 2 bar. An air volume taken to this depth from the surface
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would decrease and become half the size.
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,See Being a Diver I - Water Pressure and Air Volume Effects. - 3) I turn a glass upside
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down, trap the air in it by putting it in water, and then I take the glass down to 10 meters.
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The air space would
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A become half the size it was at the surface.
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B not change in size.
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C become 1/3 the size it was at the surface.
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D become 2/3 the size it was at the surface.
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ii C A cold, allergy or another medical problem.
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A cold, or any congestion, can block air passages in your ears and sinuses, making
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equalization difficult or impossible.
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See Being a Diver I - The Effects of Increasing Pressure on Body Air Spaces. - 4) If I am
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not able to equalize (clear) my body air spaces, it may be because I have
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A seasickness.
ii
B heart disease and high blood pressure.
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C a cold, allergy or another medical problem.
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D anxiety.
ii
ii C I am feeling a squeeze and need to equalize.
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Pain in your ears or sinuses means that they aren't equalized. Stop your descent and
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ascend slightly to relieve pressure on your ears. Then attempt to equalize again. If you
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can't equalize, end the dive.
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See Being a Diver I - The Effects of Increasing Pressure on Body Air Spaces. - 5) If my
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ears or sinuses hurt while I am descending (going down), it usually means
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A my air spaces are equalized.
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B my mask strap is too tight.
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C I am feeling a squeeze and need to equalize.
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D my mask is too small.
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ii B In the triangle area formed by my chin and the lower corners of my rib cage.
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Your alternate air source attaches with a quick release in the triangle area formed by your
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chin and the lower corners of your rib cage. Avoid letting your alternate air source dangle
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unsecured from your kit.
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See Equipment I - Regulators. - 6) The best place for me to position an alternate air source
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is
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A loose by my side so I can find it fast.
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B in the triangle area formed by my chin and the lower corners of my rib cage.
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, C to the base of my cylinder.
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D to the back of my BCD between my shoulder blades and waist.
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ii D Holding my breath while scuba diving.
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Blocking off your lungs by holding your breath and ascending could cause them to
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overexpand and rupture, which is a serious injury that could result in paralysis and death.
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Breathing continuously while scuba diving keeps air passages open allowing expanding
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air to escape.
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See Being a Diver I - The Effects of Decreasing Pressure on Body Air Spaces. - 7) Lung
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overexpansion injuries can be caused by
ii
ii
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A scuba diving without a buddy.
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B continuing a dive when not properly weighted.
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C not drinking enough water before scuba diving.
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D holding my breath while scuba diving.
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ii B 20 minutes
ii ii
60/3=20
For each 10 meters we go down, we have one more atmosphere of pressure. Also,
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remember to add in the 1 atmosphere of pressure at the surface.
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So, going down to 20 meters, we will have 2 atm + 1 atm = 3 atm of pressure. - 8) If my
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cylinder of air lasts 60 minutes while I am at the surface breathing normally, assuming all
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else is the same, how long will it last at 20 meters breathing normally?
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A 60 minutes
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B 20 minutes
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C 15 minutes
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D 12 minutes
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ii A Once a year.
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Have your cylinder visually inspected annually for internal corrosion or other
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contamination/damage.
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See Equipment I - Cylinders. - 9) How often should I take my scuba cylinder to be visually
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inspected by my dive center?
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A Once a year.
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B Once every two years.
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C Every six months.
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D Every five years.
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