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PADI Open Water - Being a Diver I Review Questions
with Answers
b. 18 metres/60 feet - Answer-As a newly certified PADI Open Water Diver, I will be trained to dive with a buddy as deep as __________. a. 10 metres/30 feet b. 18 metres/60 feet c. 30 metres/100 feet d. 40 metres/130 feet
a. true - Answer-Certain medical conditions can be hazardous while diving, so it is important to answer all questions on the Medical Statement honestly and completely. a. true b. false
a. meet specific performance requirements - Answer-PADI courses are performance- based. This means that to be certified, I must... a. meet specific performance requirements b. spend a given number of hours in training c. simply pay for the course
a. true - Answer-Failure to complete assigned independent study can create significant delays, and my instructor may have to cancel and reschedule sessions until I complete the assignment. a. true b. false
a. true - Answer-When diving in a new dive environment, two benefits of seeking an orientation, supervision, and/or additional training are that it helps me avoid problems and that it helps me enjoy the dive more. a. true b. false
There is a pressure change of 1 bar/ata for every 10 metres/33 feet of depth change. - Answer-What is the pressure change for each 10 metres/33 feet of depth change?
As pressure increases, gas volume decreases and gas density increases. - Answer- What is the relationship between pressure and the volume and density of air?
weight - Answer-Right now, you are under pressure exerted by the air in the atmosphere that surrounds you. This is actually the __________ of the air.
weight - Answer-Underwater, you're under more pressure because water also has __________, which combines with the atmosphere's pressure.
one bar (metric) or one atmosphere (imperial โ abbreviated ata) - Answer-At sea level the pressure is fairly uniform, and is expressed as...
As depth in water increases, pressure increases. As depth in water decreases, pressure decreases. - Answer-What is the relationship between my depth in water and the pressure?
10 metres/33 feet - Answer-Because water is much denser and heavier than air, __________ feet exerts the same pressure as the whole atmosphere.
Pressure increases by one bar/ata for each 10 metres/33 feet you descend (go down). - Answer-How does pressure increase underwater?
Pressure decreases one bar/ata for every 10 metres/33 feet you ascend (come up). - Answer-How does pressure decrease underwater?
1 bar/ata - Answer-At 0 metres/feet (sea level), what is the total pressure?
2 bar/ata โ one of air plus one of water - Answer-At 10 metres/33 feet, what is the total pressure?
3 bar/ata โ one of air plus two of water - Answer-At 20 metres/66 feet, what is the total pressure?
4 bar/ata - Answer-At 30 metres/99 feet, what is the total pressure?
A gas volume decreases because the gas molecules get compressed. Gas density increases because all the molecules are there, but they're packed into a smaller area. - Answer-Pressure changes affect the volume and density of air (or any other gas). As the pressure increases โ as you go deeper โ why does a gas volume decrease? Why does gas density increase?
Your air volume decreases by 1/2, and your air density will be doubled. - Answer-If you go from the surface to 10 metres/33 feet, what happens to your air volume and air density?
Your air volume decreases by 1/3 the surface volume, and your air density will be 3 times the surface density. - Answer-If you go from 10 metres/33 feet to 20 metres/ feet, what happens to your air volume and air density?
Your air volume decreases by 1/4 the surface volume, and your air density will be 4 times the surface density. - Answer-If you go from 20 metres/66 feet to 30 metres/ feet, what happens to your air volume and air density?
imbalance that pushes tissues into an air space. This happens because there is greater pressure outside the air space than inside it. - Answer-How can a squeeze occur? What does a squeeze cause, and what can it lead to if not corrected? Why does this happen?
Adding air to the air spaces as you descend in order to keep their pressure equal with the outside pressure, so they stay at their normal volume. - Answer-What it "equalization"?
You should equalize every metre/few feet before you feel discomfort or pain. To equalize your ears and sinuses, pinch your nose and blow gently against it, which sends air from your throat into your ears and sinuses. To equalize your mask, blow air into it through your nose as you descend. - Answer-How often should I equalize? How do you equalize your ears and sinuses? How do you equalize your mask?
If you can't equalize, stop your descent immediately. Signal "problem" to your friends or instructor and point to your ear. Ascend slightly until the discomfort passes and try again. After you equalize, descend more slowly, equalizing more frequently. If you still can't equalize, stop the dive. - Answer-What should I do if I can't equalize? What can happen if I don't or can't equalize and keep descending?
A forceful, extended equalization can cause serious permanent injuries to your ears and hearing. - Answer-Why should I equalize gently?
Congestion from a cold or allergy can block normal air flow and may make equalization of body air passages difficult or impossible. Earplugs create air spaces that you can't equalize. - Answer-Why does congestion from a cold or allergy temporarily keep me from diving? Why should I never dive with earplugs?
Increasing pressure may affect other body air spaces as you descend. It's very rare, but an air space can develop in filled teeth and cause discomfort. If this happens, stop your descent because you can't equalize this air space. See your dentist to correct the air space. - Answer-What other body air spaces are affected by increasing pressure? How do I equalize them?
a. mask b. ears c. sinuses - Answer-As I descend, increasing pressure affects my (choose all the apply)... a. mask b. ears c. sinuses d. skin
b. a pressure imbalance between the surrounding pressure and an air space - Answer- A squeeze is caused by... a. wearing my wet suit or other gear too tightly
b. a pressure imbalance between the surrounding pressure and an air space
a. adding air to an air space - Answer-Equalization is the process of... a. adding air to an air space b. removing air from an air space c. reducing the surrounding pressure d. increasing the surrounding pressure
c. before I feel pain or discomfort - Answer-I should equalize... a. when I feel pain or discomfort b. only if I can't tolerate the pain or discomfort c. before I feel pain or discomfort d. when I reach the bottom
b. stop my descent and signal my buddy/the instructor - Answer-I'm descending and discover I can't equalize. The first thing I would do is... a. equalize more forcefully b. stop my descent and signal my buddy/the instructor c. slow my descent and see if the problem corrects itself
a. true - Answer-I equalize gently because an extended, forceful equalization can cause permanent damage to my ears and hearing. a. true b. false
c. cancel the dive until I'm well - Answer-On a day I plan to go diving, I wake up with my sinuses blocked due to a cold or allergy, I should... a. take an approved decongestant so I will be able to equalize b. plan to take a lot longer as I descend c. cancel the dive until I'm well
a. true - Answer-When scuba diving, normal breathing keeps your lungs equalized to the normal pressure. a. true b. false
The most important rule in scuba diving is to breathe continuously and never ever hold your breath. - Answer-What is the most important rule in scuba diving?
Expanding air can cause serious lung over expansion (lung rupture) injuries that are difficult to treat and can cause paralysis and death by forcing air into the bloodstream and chest cavities. - Answer-What can happen if I don't follow the most important rule in scuba diving?
A reverse block, also called a reverse squeeze, results when expanding air becomes trapped in a body air space. - Answer-What is a "reverse block"?
c. deeply and slowly - Answer-The most efficient way to breath dense air underwater is to breathe... a. shallowly and slowly b. shallowly and rapidly c. deeply and slowly d. deeply and rapidly
a. true - Answer-My body responds to anxiety with increased breathing, but slow breathing helps reduce anxiety. a. true b. false
a. Breathe continuously and never ever hold my breath. b. Breathe slowly and deeply. c. Do not allow myself to get winded or out-of-breath. d. If faced with a problem, stop, then maintain or restore slow, deep breathing. - Answer-Which of the following are among the breathing rules I follow as a diver? (Choose all that apply.) a. Breathe continuously and never ever hold my breath. b. Breathe slowly and deeply. c. Do not allow myself to get winded or out-of-breath. d. If faced with a problem, stop, then maintain or restore slow, deep breathing.
Buoyancy is an upward force acting on an object in water, which is why you feel "lighter" in water. This force is caused by the water displaced (pushed aside) by the object, and is equal to the weight of the water displaced. - Answer-What is buoyancy? What causes it?
Positive buoyancy, which occurs when an object weighs less than the water it displaces and the object floats. Negative buoyancy, which occurs when an object weighs more than the water it displaces and the object sinks. Neutral buoyancy, which occurs when an object weighs the same as the water it displaces and the object neither floats nor sinks. - Answer-What are the three types of buoyancy? Describe them.
your weight system and your BCD or Buoyancy Control Device - Answer-What two pieces of equipment do I normally use to control buoyancy?
When you descend, volume decreases, which reduces water displaced and reduces your buoyancy making you more negatively buoyant. You offset this by adding air to your Buoyancy Control Device. When you ascend, the gas volume in your gear re- expands, which increases your buoyancy. The air you added to your BCD also expands and further increases your buoyancy. To control your buoyancy, as you ascend you vent (release) the air you added on the way down. - Answer-How does descending affect your buoyancy? How do you offset this? How does ascending affect your buoyancy? What happens to the air you aded to your BCD? How do you control this?
When you inhale, your chest expands, increasing your volume, displacement, and buoyancy. When you exhale, you contract your chest, decreasing your volume, displacement, and buoyancy. - Answer-How does breathing affect my buoyancy?
It is important to master buoyancy control because it affects almost everything you do in and underwater. - Answer-Why is it important to master buoyancy control?
A given volume weighs more in salt water than in fresh water, because salt water has dissolved minerals (salt) in it. Salt water causes more buoyancy (more upward force) than fresh water, because salt water weighs more. - Answer-Does a given volume weigh more in salt water or fresh water? Why? Does salt water or fresh water cause more buoyancy? Why?
Your weight system holds just enough lead weight to offset your positive buoyancy. You need this because most people float, and some of your gear also floats. How much weight you need depends upon your gear, your physical characteristics, and whether you're diving in fresh or salt water. Use just enough weight to allow you to descend, but you shouldn't sink rapidly. - Answer-What does your weight system hold? Why do you need this? How much weight should you use?
To change your buoyancy during a dive, you use your BCD or Buoyancy Control Device. Inflating and deflating it increases and decreases your volume or how much water you displace. This adjusts your buoyancy so you can be positively, negatively, or neutrally buoyant when you want. - Answer-What piece of equipment will you use to change your buoyancy during a dive? What does inflating and deflating it do? What does this adjust?
You use your Buoyancy Control Device frequently because your buoyancy tends to change when you change depth. - Answer-Why do you use your BCD frequently?
descend and ascend at a slow, controlled rate; stop a descent or ascent and maintain your depth with little effort; float comfortably on the surface; save energy and avoid harming sensitive aquatic organisms by swimming neutrally buoyant and controlling your movements; maintain the underwater visibility by helping you not stir up the bottom; enjoy the "weightlessness" sensation that is unique to diving. - Answer-List six things that buoyancy control allows you to do.
a. true - Answer-Buoyancy is a force that pushes an object in water upward. a. true b. false
a. positively - Answer-My sunglasses case falls out of my pocket into the water, but fortunately, it floats so I retrieve it. I would say my sunglasses case is __________ buoyant. a. positively b. negatively
a. true - Answer-In recreational diving, the buddy system means diving with another diver or divers in a team that provides assistance and safety benefits. a. true b. false
a. practicality b. safety c. fun - Answer-Overall benefits of the buddy system include (choose all that apply): a. practicality b. safety c. fun
