PADI Final Exam A

PADI Final Exam A If an object is neutrally buoyant (does not sink or float) in fresh water; the same object placed into salt water would: - ANS - sink. Imagine you blow up a balloon, tie it off, and take it to the bo ...

PADI Final Exam A If an object is neutrally buoyant (does not sink or float) in fresh water; the same object placed into salt water would: - ANS - sink. Imagine you blow up a balloon, tie it off, and take it to the bottom of the swimming pool. What will happen to the balloon and the air inside it? - ANS - The balloon will get smaller and the air inside the balloon will be more dense (molecules move closer together). Imagine you turn a glass upside down, trap the air in it by putting it in water, and then you take the glass down to 33 feet. What would happen to the air space in the glass? - ANS - The air space would become half the size it was at the surface. If you are not able to equalize (clear) your body air spaces, it may be because you have: - ANS - a cold, allergy or another breathing medical problem. If you ears or sinuses hurt while you are descending (going down), it usually means: - ANS - you are feeling a squeeze and need to equalize. Imagine if you held a glass upside down at 33 feet and filled it with air from your tank. What would happen to the air in the glass as you ascend (go up)? - ANS - The expanding air would bubble out of the bottom of the glass. Holding your breath while scuba diving can: - ANS - Cause lung injuries, push air into the blood stream and chest area, and lead to life threatening injuries. If your tank of air lasts 60 minutes while you are at the surface breathing normally, how long will it last at 66 feet breathing normally? - ANS - 20 minutes How often should you take your suva tank to be visually inspected by your dive center? - ANS - Once a year How can you identify a DIN tank valve from a yoke valve? - ANS - The DIN valve has a threaded opening to screw the regulator into. What can you do to properly care for a scuba tank? - ANS - Do not use all the air in the tank. Underwater things look ________. When you look at things underwater they often seem_______ than when you look at them on the surface. - ANS - bigger, nearer _______ travels faster in water. This is why you cannot use it to tell direction very well. - ANS - Sound How should you move under water? - ANS - Slowly and steadily If you work too hard and find it difficult to breathe underwater, you should: - ANS - stop all activity and rest, hold onto something for support, if possible. As you descend (go down) towards the bottom, you wet suit will: - ANS - compress (become smaller in thickness) from water pressure and you will lose buoyancy and warmth the deeper you go. You know you are properly weighted for diving if you: - ANS - float at eye level holding a normal breath of air with an empty BCD. If you and your buddy were separated underwater what would you generally do? - ANS - Search for a minute underwater and then go up to find your buddy. You are most likely to become confused about which way is up or down ______. This can happen because _______. - ANS - in midwater, you cannot see the surface or the bottom. Imagine you feel a mild current at the start of your dive. How should you begin the dive? - ANS - Dive against or into the current. What the bottom is made of can cause big changes in: - ANS - visibility Most injuries caused by aquatic animals happen because: - ANS - the animal is trying to protect itself. What are signs of a diver in distress (trouble) at the surface? - ANS - The diver's head is high above the water, mask is off the face and regulator is out of their mouth. The diver moves quickly and jerkily instead of slowly and calm. The diver does not respond to directions. In an out-of-air situation, while you are close to your buddy, what is the best thing to do? - ANS - switch to your buddy's alternate air source. If your regulator begins to free glow (releases lots of air at once) while underwater, you should: - ANS - Hold the regulator without sealing your mouth around the mouth-piece and "sip" the air you need as you ascend (go up). Imagine you are very low on air and about to run out. When should you do a controlled emergency swimming ascent? (Swimming up to the surface making a continuous sound like ahh-h-h-h) - ANS - When buddy is too far away. Imagine you are very low on air and about to run out. When should you do a buoyant emergency ascent? - ANS - When buddy is too far away and you are deeper than 30 feet. Imagine you are very low on air and about to run out. When should you do a normal ascent? - ANS - When low on air, not out of air. Imagine you are very low on air and about to run out. When should you do a Alternate air source ascent? - ANS - When buddy is near. Imagine you have an injured diver who is out of the water and is not listening to you or answering your questions? The first thing to do would be: - ANS - make sure the diver is breathing and has a pulse. To prevent breathing contaminated air (bad air): - ANS - Have tanks filled at a dive center you trust, do not use air that tastes or smells bad, and do not use a compressor designed to fill car tires to fill your tank. Divers who act foolishly at depth may start acting normal again if they: - ANS - ascend to a shallower depth You are likely to increase the risk of decompression sickness if: - ANS - You are tired, cold, sick, thirsty or overweight. If you think you have decompression sickness you should: - ANS - Breathe 100% oxygen and contact emergency medical care. You dive to 17 meters for 23 minutes. After a 30 minute surface interval, you plan to dive to 16 meters. What is the maximum allowable time for the second dive? - ANS - 53 min Imagine you are planning to make two dives. The first dive is to 18 meters for 49 minutes, and the second dive is to 18 meters for 24 minutes. How long would you have to stay on the surface (minimum surface interval) to do these two dives safely? - ANS - 32 min Imagine you dive to 17 meters for 47 minutes. After a 30 minute surface interval you do a second dive to 17 meters. Losing track of time, you notice your bottom time is now 25 minutes. According to the General Rules, what should you do? - ANS - Ascend 9go up_ right away to 5 meters and stay there for 8 minutes before going to the surface, and do not dive for 6 hours. A group of advanced divers plan to make two dives. The first dive is on a reef in 22 meters of water for 20 min. The group then remain on the surface for 1 hour. The second dive in on a wreck in 16 meters of water, with a planned bottom time of 30 minutes. What will be the ending pressure group after the second dive? - ANS - pressure group P You and your buddy are planning to dive at a site where the water and air temperature are near freezing. You plan to dive to 18 meters for 30 minutes. What dive profile would you use when planning your dive? - ANS - 22 meters for 30 minutes. Imagine you are an Advanced Open Water Diver. You plan to do 3 dives. The first dive is a 25 meter dive for 20 minutes followed by a 45 minute minute surface interval. The second dive is to 16 meters for 37 minutes followed by a surface interval of 62 minutes. Your third dive is to 16 meters. What would be your maximum allowable bottom time for the third dive? - ANS - 47 minutes To reduce the risk of decompression sickness (DCS-nitrogen bubbles blocking blood circulation/flow in your body after a dive): - ANS - make a safety stop at 15 feet at the end of each dive. You make two dives in one day and you are flying home on a commercial plane. What is the minimum time you have to wait before you can go on the plane? - ANS - 18 hours When diving in the mountains or in places higher than 1000 ft.: - ANS - You need to use special tables and procedures (rules). When you are diving with a computer you should: - ANS - Make sure all divers have their own computers, follow the most conservative computer, and stay well within the computer limits.