PADI, Open Water Diver, Final Exam Review
12) 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
1. regulator first stage, 2. regulator second stage, 3. alternate air source second stage, 4. instrument console/gauges/computer.5. low pressure inflator hose for the BCD. Your regulator consists of five components. The first stage is the "hub" of your regulator and supplies air to the components - the second stage, alternate air source, low pressure inflator hose and SPG/dive computer. See Equipment I - Regulators.
53) I dive to 17 meters for 47 minutes. After a 30-minute surface interval, I do a second dive to 17 meters. Losing track of time, I notice my bottom time is now 25 minutes. According to the General Rules, what should I do? Note: you may have to scroll down to see the whole question or to submit your answer. A Ascend (go up) right away to 5 meters and stay there for at least 8 minutes before going to the surface, and not dive for six hours. B Go to the surface right away and contact the nearest recompression chamber. C Ascend (go up) right away to 5 meters and stay there for 3 minutes before going to the surface. D Ascend (go up) to 3 meters and stay there until I use up my air, and not dive for 24 hours.
A Ascend (go up) right away to 5 meters and stay there for at least 8 minutes before going to the surface, and not dive for six hours. Using RDP Table 1, find the next greatest depth on the top row - 18m - and follow the column down to the time or next greatest time - 48/47 - go across the find pressure group S. In RDP Table 2, follow S to find 30 minutes (between 28-32 minutes) and follow that column down to pressure group L. Go to RDP Table 3, follow the next greatest depth - 18m - across to meet L. The number in the blue box - 24 - is allowed bottom time. Staying 25 minutes means you've overstayed your bottom time by one minute. The rule is to ascend to 5 meters and stay there for at least 8 minutes before going to the surface, and not dive for six hours. See the RDP/eRDPML Instructions for Use booklet.
38) Divers who act foolishly at depth due to gas narcosis may start acting normally again if they A ascend (go up) to a shallower depth. B breathe slowly and deeply. C signal their buddy for help. D dive within no stop limits.
A Ascend (go up) to a shallower depth. If you or a buddy experience narcosis, immediately ascend to a shallower depth. Narcosis generally fades quickly when you return to a shallower depth. See Being a Diver V - Gas Narcosis.
35) Although it shouldn't have happened, on a dive I fail to watch my SPG and run out of air. If my buddy is close by, my best option is to __________. Another option is to _____________, if I'm in shallow water and the surface is closer than my buddy. Note: you may have to scroll down to see the whole question or to submit your answer. A ascend using my buddy's alternate air source / make a controlled emergency swimming ascent B ascend using my buddy's alternate air source / make an buoyant emergency ascent C make a normal ascent / ascend using my buddy's alternate air source D make a controlled emergency swimming ascent / make a normal ascent
A Ascend using my buddy's alternate air source / make a controlled emergency swimming ascent You can make a normal ascent when very low on air, but your cylinder isn't completely empty. When out of air, your best option is usually to make an alternate air source ascent using your buddy's alternate air source. Make a controlled emergency swimming ascent when fairly shallow and the surface is closer than a buddy with an alternate air source. Make a buoyant emergency ascent when your buddy is not near and you're deep enough that you don't think you can make it to the surface by just swimming. See Being a Diver III - Underwater Problem Management.
17) As I descend (go down), my wet suit will A compress (feel thinner) from water pressure, and I will lose buoyancy and warmth. B expand (feel thicker) from water pressure, and I will gain buoyancy and warmth. C remain the same thickness from the water pressure, and there will be no change in warmth. D expand (feel thicker) from water pressure, and I will lose buoyancy and warmth.
A Compress (feel thinner) from water pressure, and I will lose buoyancy and warmth. The small bubbles in your wet suit compress as you get deeper. This causes your buoyancy to decrease and makes the wet suit thinner, which affects warmth. To control your buoyancy, add small amounts of air to your BCD frequently during descent. See Being a Diver II - Descents in Open Water.
43) When making computer assisted dives A each diver needs a personal computer. B each buddy team needs a computer C up to four divers may share a computer. D all divers may follow the dive guide's computer.
A Each diver needs a personal computer. Divers can't share a dive computer. Each diver needs a computer and the buddy team should follow the most conservative computer to turn or end a dive. See Using Dive Computers and Tables I - Diving with Your Computer.
46) If I'm diving in cold water or under strenuous conditions A I should add an extra safety margin and stay well within my computer's limits. B nitrogen absorption will be slower so I can stay longer. C my dive computer will probably not work at all. D I do not need to do anything special.
A I should add an extra safety margin and stay well within my computer's limits. If you get cold or exercise a lot during a dive, you may end up with more dissolved nitrogen than calculated by your dive computer or tables. This could increase your decompression sickness risk. Stay well within the no stop limits, being even more conservative than normal by adding an extra safety margin. See Using Dive Computers and Tables II - Cold and Strenuous Dives.
13) When I look at things underwater they often seem ___________ than they look on the surface. A larger and/or nearer B larger and/or further away C smaller and/or further away D smaller and/or nearer
A Larger and/or nearer As light travels through water and into your mask, it bends, or refracts. This makes objects appear larger and closer than they really are. See Being a Diver II - Seeing and Hearing as a Diver.
23) Choose the best answer for the signal shown from the choices provided. A Okay? Okay. (on the surface at a distance) B I have cramps in my legs. C I would like to snorkel in. D Boat pick up, I have air.
A Okay? Okay. (on the surface at a distance) This is the hand signal for Okay on the surface. See Your Skills as a Diver I - Hand Signals.
9) 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.
A Once a year. Have your cylinder visually inspected annually for internal corrosion or other contamination/damage. See Equipment I - Cylinders.
19) Choose the best answer for the signal shown from the choices provided. A Stop, hold it, stay there. B Go back. C Please be quiet. D Go up.
A Stop, hold it, stay there. This is the hand signal for stop, hold it or stay there. See Your Skills as a Diver I - Hand Signals.
33) I am close to my buddy and realize I am out of air. The best response is to A switch to my buddy's alternate air source. B make a controlled emergency swimming ascent (swim up to the surface making a continuous sound, like ah-h-h-h). C make a buoyant emergency ascent (dropping my weight system). D switch to my buddy's alternate air source and continue the dive.
A Switch to my buddy's alternate air source. When out of air, your best option is usually to make an alternate air source ascent using your buddy's alternate air source. See Being a Diver III - Underwater Problem Management.
36) There is an injured diver who is out of the water and is not responding to touch or my voice. The first thing to do would be A to check if the diver is breathing. B to keep the diver warm. C to decide what happened. D to provide oxygen.
A To check if the diver is breathing. Your priority when assisting someone who is unresponsive is to make sure the diver is breathing. Provide rescue breaths as necessary. Contact emergency medical care. See Being a Diver III - First Responder Care for Diving-Related Emergencies.
30) What the bottom is made of can cause big changes in A visibility (how far you can see underwater). B temperature (how warm the water is). C current (the movement of water). D buoyancy (whether you sink or float).
A Visibility (how far you can see underwater). The nature and composition of particles in the water affects visibility. Large, heavy material - like from gravel and rock bottoms - settles out of the water quickly, restoring visibility quickly. Small, light particles - like from mud and clay bottoms - can remain suspended for very long periods. See Being a Diver III - Visibility.
47) If my computer fails during a dive, I can use my backup computer to continue the dive. If I'm not wearing a backup, I should A ascend (go up), make a safety stop and end the dive. B borrow my buddy's backup. C continue the dive until low on air, but make no repetitive dives. D end the dive and surface immediately.
A ascend (go up), make a safety stop and end the dive. The procedure for a failed dive computer is to signal your buddy, ascend, make a safety stop and end the dive. If you're remaining well within limits throughout the dive, you should surface within accepted limits. You can't continue to dive without being able to track your dive profile. See Using Dive Computers and Tables I - Diving with Your Computer.
3) I turn a glass upside down, trap the air in it by putting it in water, and then I take the glass down to 10 meters. The air space would A become half the size it was at the surface. B not change in size. C become 1/3 the size it was at the surface. D become 2/3 the size it was at the surface.
A become half the size it was at the surface. At 10 meters, the pressure is 2 bar. An air volume taken to this depth from the surface would decrease and become half the size. See Being a Diver I - Water Pressure and Air Volume Effects.
8) 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
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.
55) My buddy and I are planning to dive at a site where the water and air temperature are near freezing. We plan to dive to 18 meters for 30 minutes. What dive profile would we use when planning our dive? A 22 meters for 40 minutes B 22 meters for 30 minutes C 20 meters for 30 minutes D 18 meters for 30 minutes
B 22 meters feet for 30 minutes This general rule is printed on the RDP Table: if you are planning a dive in cold water or under conditions that might be strenuous, plan the dive assuming the depth is 4 meters deeper than actual. See the RDP/eRDPML Instructions for Use booklet.
51) I dive to 18 meters for 33 minutes. After a 30-minute surface interval, I plan to dive to 17 meters. What is the maximum allowable time for the second dive? A 21 minutes B 32 minutes C 23 minutes D 19 minutes
B 32 minutes Using RDP Table 1, find the depth on the top row - 18m - and follow the column down to the time or next greatest time - 34/33 - go across the find pressure group M. In RDP Table 2, follow M to find 30 minutes (between 26-32 minutes) and follow that column down to pressure group H. Go to RDP Table 3, follow the next deepest depth - 18m - across to meet H. The number in the blue box - 32 - is the allowed bottom time. See the RDP/eRDPML Instructions for Use booklet.
52) I am planning to make two dives. The first dive is to 18 meters for 49 minutes. The second dive is to 18 meters for 24 minutes. How long would I have to stay on the surface (minimum surface interval) to do these two dives safely? A 26 minutes B 32 minutes C 54 minutes D 59 minutes
B 32 minutes Using RDP Table 1, find the depth on the top row - 18m - and follow the column down to the time or next greatest time - 51/49 - go across the find pressure group T. On RDP Table 3, follow 18m row across until you find a time in the blue box equal to 24 minutes - follow this up to pressure group L. Go to RDP Table 2, follow the L column from the bottom until it meets the T row - the minimum surface interval is 32 minutes. See the RDP/eRDPML Instructions for Use booklet.
39) I am likely to increase the risk of decompression sickness (DCS) if I A dive in poor visibility, strong moving water, and rough seas. B dive while tired, cold, sick, thirsty or injured. C do not look after my equipment. D am using a dive computer.
B Dive while tired, cold, sick, thirsty or injured. Secondary factors that can contribute to developing decompression sickness include fatigue, dehydration, cold, poor fitness, high body fat, illness, injuries, age, alcohol consumption before or after a dive, and vigorous exercise before, during or immediately after a dive. See Being a Diver IV - Decompression Sickness.
45) If I accidentally exceed my computer's no stop limits, I should A make a safety stop for three minutes at 5 meters. B follow the computer's instructions for decompression. C surface immediately, breathe oxygen and report my condition to the divemaster. D make a controlled ascent and refer to the manufacturer's literature for decompression procedures.
B Follow the computer's instructions for decompression. If you exceed a no stop limit, you will have to make an emergency decompression stop. You computer will go into decompression mode and guide you by providing the depth of your emergency decompression stop and how long you have to stay there before you can ascend to the surface. Emergency decompression stops are required so that you don't exceed accepted theoretical nitrogen levels. See Using Dive Computers and Tables II - Emergency Decompression Stops.
6) 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.
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.
44) It's important that I do not turn off a dive computer between dives because A the divemaster may object because I can't recall the dive information for logging. B it would lose memory of the previous dive and not calculate repetitive dives correctly. C it won't come back on, or it may take a long time to power up. D doing so is hard on the batteries and may cause the computer to fail.
B It would lose memory of the previous dive and not calculate repetitive dives correctly. Your dive computer tracks your personal theoretical nitrogen levels continuously during all your dives and surface intervals. For your safety, to keep an accurate account, you must not turn off your computer and need to use the same computer the entire diving day, on all dives. See Using Dive Computers and Tables I - Repetitive Diving.
25) Choose the best answer for the signal shown from the choices provided. A Look at me. B Low on air. C Share air. D Go up.
B Low on air. This is the hand signal for low on air. See Your Skills as a Diver I - Hand Signals.
41) The first step in using my dive computer is A setting the time and date. B reading the manufacturer's instructions. C calibrating it for enriched air nitrox. D setting it for fresh or salt water.
B Reading the manufacturer's instructions. Before you dive with a computer, you need to read the manufacturer's dive computer manual. It's your responsibility to read and understand the manufacturer's instructions. See Using Dive Computers and Tables I - Planning Dives with Your Computer.
27) If I were separated from my buddy, the general procedure is to A go up immediately, wait a minute and then go back down. B search for a minute and then go up to reunite with my buddy at the surface. C go to the surface immediately and get out of the water. D look for my buddy's bubbles and follow the bubbles to find my buddy.
B Search for a minute and then go up to reunite with my buddy at the surface. The general procedure for buddy separation is to search for no more than one minute, then surface to reunite. See Being a Diver II - The Buddy System.
26) Choose the best answer for the signal shown from the choices provided. A Turn the dive. B Share air. C I am thirsty. D I have lost my mouthpiece.
B Share air. This is the hand signal for share air. See Your Skills as a Diver I - Hand Signals.
20) Choose the best answer for the signal shown from the choices provided. A Which is the right way? B Something is wrong. C Go up and down. D Everything is okay.
B Something is wrong. This is the hand signal for something is wrong. See Your Skills as a Diver I - Hand Signals.
16) If I work too hard and find it difficult to breathe underwater, I should A inflate my BCD. B stop all activity and rest, holding onto something for support if possible. C swim immediately to my buddy and signal for help. D do a controlled emergency swimming ascent (CESA - swimming up to the surface saying the ah-h-h-h sound).
B Stop all activity and rest, holding onto something for support if possible. If you find it difficult to breathe you're overexerted. Immediately stop and rest while holding onto something for support to restore normal breathing. Continue only after you've regained a normal, slow breathing rate. See Being a Diver II - Overexertion.
2) I 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? A The balloon will get bigger and the air inside the balloon will be less dense (molecules move further apart). B The balloon will get smaller and the air inside the balloon will be more dense (molecules move closer together). C The balloon will get bigger and the air inside the balloon will be more dense. D The balloon will get smaller and the air inside the balloon will be less dense.
B The balloon will get smaller and the air inside the balloon will be more dense (molecules move closer together). As water pressure increases, the volume of an air space will decrease. This causes the density of the air inside to increase and air molecules are pushed closer together. The balloon would get smaller and the air density inside would be greater. See Being a Diver I - Water Pressure and Air Volume Effects.
42) When planning a dive with a computer, I use the "plan" or "no stop scroll" mode to determine A the maximum depth of the previous dive. B the maximum allowable time limits for depths (typically in 3-meter). C whether my computer is compatible with my buddy's computer. D the best settings for my backup computer.
B The maximum allowable time limits for depths (typically in 3-meter). You plan dives with your dive computer by activating it and scrolling the no stop limits. With most computers, you scroll depths in 3 meter increments, displaying the maximum time allowed at each depth. Agree with your buddy on a maximum depth based on the no stop times displayed. See Using Dive Computers and Tables I - Planning Dives with Your Computer.
15) Unless there are laws that say differently, I should stay within ___________ of my dive flag. A 60 meters B 30 meters C 15 meters D 5 meters
C 15 meters If there are no specific local laws regarding dive flags, stay within 15 meters of the flag. Boats should stay 30 to 60 meters away. See Equipment III - Dive Flags.
49) As a new PADI Open Water Diver, the recommended maximum depth is ______________, or the actual depth I reached in training, if shallower. The maximum depth for all recreational scuba divers, even experienced divers, is ______________. A 10 meters/ 18 meters B 12 meters / 30 meters C 18 meters / 40 meters D 24 meters / 58 meters
C 18 meters/ 40 meters The recommended depth limit for you as a newly certified PADI Open Water Diver is a maximum of 18 meters (or the actual depth you reached in training, if shallower). For recreational diving, the maximum depth is 40 meters. See Being a Diver V - Continuing Your Adventure.
56) I am an Advanced Open Water Diver. I plan to do three dives. The first dive is a 25-meter dive for 22 minutes followed by a 52-minute surface interval. The second dive is to 20 meters for 27 minutes followed by a surface interval of 62 minutes. My third dive is to 18 meters. What would be my maximum allowable bottom time for this third dive? A 21 minutes B 54 minutes C 34 minutes D 25 minutes
C 34 minutes Using RDP Table 1, find the depth on the top row - 25m - and follow the column down to the time - 22 - go across the find pressure group L. In RDP Table 2, follow pressure group row to find 52 minutes and follow that column down to pressure group D. Go to RDP Table 3, follow D down to meet - 20m. The number in the white box - 15/13 - is the residual nitrogen time. Add this time to the bottom time - 15/13 + 27 = 42/40. On RDP Table 1, follow the 20m column down to the time or next greater time - pressure group is S/T. In RDP Table 2, follow pressure group row to find 1 hour and 2 minutes and follow that column down to pressure group G. Go to RDP Table 3, follow G down to meet - 18m. The number in the blue box - 34 - is the maximum bottom time. See the RDP/eRDPML Instructions for Use booklet.
4) If I am not able to equalize (clear) my body air spaces, it may be because I have A seasickness. B heart disease and high blood pressure. C a cold, allergy or another medical problem. D anxiety.
C A cold, allergy or another medical problem. A cold, or any congestion, can block air passages in your ears and sinuses, making equalization difficult or impossible. See Being a Diver I - The Effects of Increasing Pressure on Body Air Spaces.
40) If I think I have decompression sickness I should A stop diving until I feel better. B go back in the water. C breathe 100 percent oxygen and contact emergency medical care. D see a doctor when I can.
C Breathe 100 percent oxygen and contact emergency medical care. For a suspected case of decompression illness, contact emergency medical care, lie down and breathe emergency oxygen. Almost all cases of decompression illness require treatment in a recompression chamber. Don't delay first aid and getting to treatment. See Using Dive Computers and Tables II - First Aid Treatment for Decompression Illness.
22) Choose the best answer for the signal shown from the choices provided. A Wave to friends on the beach. B I need more weight. C Distress, help. D I need the boat to pick me up.
C Distress, help. This is the hand signal for distress or I need help on the surface. See Your Skills as a Diver I - Hand Signals.
29) I feel a mild current at the start of my dive. How should I begin this dive? A Dive with the current. B Dive across the current. C Dive against or into the current. D Dive at an angle to the current.
C Dive against or into the current. By swimming into a current for the first part of a dive, you can let it carry you back to where you started during the second part. See Being a Diver III - Water Movement.
18) I know I am properly weighted for diving if I A float at neck level with my BCD about half full while I am holding a normal breath of air. B sink slowly holding a normal breath of air and with an empty BCD. C float at eye level while holding a normal breath of air and with an empty BCD. D sink easily with a partially filled BCD.
C Float at eye level while holding a normal breath of air and with an empty BCD. Part of having good buoyancy and trim is having the right amount of weight. You should float at eye level with an empty BCD and holding a normal breath. When you exhale, you should slowly sink. See Your Skills as a Diver II - Weight Check and Proper Weighting.
34) If my regulator begins to free flow (release air continuously) while underwater, I should A make a controlled emergency swimming ascent. B do nothing special. C hold the regulator without sealing my mouth around the mouthpiece and "sip" the air I need as I ascend (go up). D make a buoyant emergency ascent.
C Hold the regulator without sealing my mouth around the mouthpiece and "sip" the air I need as I ascend (go up). You can breathe from a freeflowing regulator by "sipping" air as you need it. Don't seal your mouth around the mouthpiece. Begin your ascent promptly, because the freeflow will exhaust your air supply quickly. See Being a Diver III - Underwater Problem Management.
5) If my ears or sinuses hurt while I am descending (going down), it usually means A my air spaces are equalized. B my mask strap is too tight. C I am feeling a squeeze and need to equalize. D my mask is too small.
C I am feeling a squeeze and need to equalize. Pain in your ears or sinuses means that they aren't equalized. Stop your descent and ascend slightly to relieve pressure on your ears. Then attempt to equalize again. If you can't equalize, end the dive. See Being a Diver I - The Effects of Increasing Pressure on Body Air Spaces.
11) 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.
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.
21) Choose the best answer for the signal shown from the choices provided. A My finger is cold. B Go around the rock. C Okay? Okay. D Stay together.
C Okay? Okay. This is the hand signal for Okay. See Your Skills as a Diver I - Hand Signals.
48) I make two dives in one day and am flying home on a commercial plane. I should wait until my computer says I can fly or ________ hours, whichever is longer. A 0 B 48 C 24 D 18
D 18 The flying after diving recommendation is that for repetitive dives or multiday dives, a minimum preflight surface interval of 18 hours in suggested. See Using Dive Computers and Tables II - Flying After Diving and Altitude Diving.
32) A diver at the surface is moving quickly and jerkily, has the mask off the face, the regulator/snorkel is out of the mouth, and the diver does not respond to directions. The diver is A giving the okay signal. B performing a predive safety check. C excited about the dive. D showing signs of distress (trouble).
D Divers who are distressed or panicked often have their masks on their foreheads and don't use their breathing equipment. They usually have wide, unseeing eyes, quick and jerky movements, and do not follow instructions. They need immediate help because they may continue to struggle until exhausted. See Being a Diver III - Surface Problem Management - Responsive Diver.
10) The difference between DIN valves and yoke valves is that DIN valves A are made from durable plastic. B contain a spring-operated 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.
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.
7) 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.
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.
50) When diving at an altitude above 300 meters A I do not need to follow special procedures. B I can't use my dive computer. C I do not need to follow special procedures, but my computer may need to be set for the altitude. D I need to follow special procedures and may need to set my computer for the altitude.
D I need to follow special procedures and may need to set my computer for the altitude. Because you surface to lower atmospheric pressure, you need to use altitude diving procedures if diving at an altitude of 300 meters or higher. Many dive computers automatically adjust and some have settings you can adjust for altitude diving. See Using Dive Computers and Tables II - Flying After Diving and Altitude Diving.
28) I am most likely to become confused about which way is up or down _____________. A at the surface B near the surface C on the bottom D in midwater
D In midwater When descending and ascending in reduced visibility, you can feel disoriented, especially in mid-water when you can't see either the bottom or the surface. See Being a Diver III - Visibility.
24) Choose the best answer for the signal shown from the choices provided. A Which way to the boat? B Stay at this depth. C Go this way. D Out of air.
D Out of air. This is the hand signal for out of air. See Your Skills as a Diver I - Hand Signals.
54) A group of Advanced Open Water Divers plans to make two dives. The first dive is on a reef in 22 meters of water for 20 minutes. The group then remains on the surface for 1 hour. The second dive is on a wreck in 18 meters of water, with a planned bottom time of 30 minutes. What will be the ending pressure group after the second dive? A L B K C S D R
D R Using RDP Table 1, find the depth on the top row - 22m - and follow the column down to the time or next greatest time - 21 - go across the find pressure group I/K. In RDP Table 2, follow pressure group row to find 1 hour and follow that column down to pressure group C. Go to RDP Table 3, follow C down to meet - 18m. The number in the white box - 15/14 - is the residual nitrogen time. Add this time to the bottom time - 15/14 + 30 = 45/44. On RDP Table 1, follow the 18m column down to the time or next greater time - Pressure Group is R. See the RDP/eRDPML Instructions for Use booklet.
37) I should have cylinders filled at a dive center I trust, not use air that tastes or smells bad, nor use air from a compressor designed to fill car tires. This is important to A decrease the likelihood of gas narcosis. B increase the enjoyment of my dive. C reduce the risk of lung overexpansion injuries. D reduce the risk of breathing contaminated air.
D Reduce the risk of breathing contaminated air. Contaminated air is rare because it's easy to avoid by getting your cylinders filled at reputable scuba air sources - namely, professional dive operations. Dive centers and resorts take care of their fill systems and know the value of regular air testing. See Being a Diver IV - Contaminated Air.
14) ___________ travels faster in water than it does in air. This is why you cannot easily tell where it comes from. A Light B Current C Aquatic life D Sound
D Sound Sound travels about four times faster in water than in air. This makes it difficult to determine where the sound is coming from because it seems to come from all around or directly overhead. See Being a Diver II - Hearing Underwater.
31) Most injuries caused by aquatic animals happen because the animals are A hungry. B curious. C injured. D trying to defend themselves.
D Trying to defend themselves. Nearly all aquatic life injuries result from defensive actions by the animals. You can generally avoid injuries by being aware and respectful of aquatic organisms. See Being a Diver III - Aquatic Life.
1) If an object is neutrally buoyant (does not sink or float) in fresh water, the same object placed into salt water would A sink. B either sink or float. C do nothing. D float.
D float. Salt water is heavier than fresh water because it has dissolved minerals in it. This means it causes more upward force (buoyancy) on an object. An object that is neutrally buoyant in fresh water would float in salt water because there is greater upward force. See Being a Diver I - Buoyancy and Controlling Buoyancy.