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SDI Open Water Test Graded A+ 2024, Exams of Advanced Education

New York University Tandon School of EngineeringAdvanced Education

SDI Open Water Test Graded A+ 2024

Typology: Exams

2023/2024

Available from 09/09/2024

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SDI Open Water Test Graded A+
A cylindar should be visually inspected at least XXX a year and hydrostatically tested
every XXX years in the United States. - ANSWER-1. once a year 2. every five years
A snorkel is a required piece of equipment. What side of the mask does a snorkel
belong on? Why? - ANSWER-The Left Side. Because your regulator goes on the right
side and you don't want the snorkel to get in the way.
A tank is considered out of air on a dive when
(A) The tank is empty
(B) 200 PSI
(C) 500 PSI
(D) 1,000 PSI - ANSWER-(C) 500 PSI
A weight belt should be put on with a XXX hand release. - ANSWER-Right
A. Define Thermocline
B. Give an example - ANSWER-A. A layer of water that separates warmer surface
water from cold deep water.
B. Air temperature could be 85 degrees, Water temperature could be 81 degrees. But
water at the bottom could be 51 degrees.
A. Describe Boyle's Law
B. Why is this important to a diver? - ANSWER-A. If pressure increases, then volume
decreases, and vice versa.
B. Boyle's law can be used to determine the effect of depth on air consumption and it
can be used to prevent diving related injuries.
A. How much faster does sound move underwater than in the air?
B. Why is this important to a diver? - ANSWER-A. Sound moves 4X faster in water than
air due to the density of the water.
B. It's difficult for the diver to tell which direction sound is coming from, or how far away
it is. This can be especially dangerous when you hear a boat overhead.
A. How much larger and closer do items appear underwater?
B. Why is this important to a diver? - ANSWER-A. 33% Larger and 25% Closer
B. Visual distortion may be disorienting to a diver and can cause dizziness.
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SDI Open Water Test Graded A+

A cylindar should be visually inspected at least XXX a year and hydrostatically tested every XXX years in the United States. - ANSWER-1. once a year 2. every five years A snorkel is a required piece of equipment. What side of the mask does a snorkel belong on? Why? - ANSWER-The Left Side. Because your regulator goes on the right side and you don't want the snorkel to get in the way. A tank is considered out of air on a dive when (A) The tank is empty (B) 200 PSI (C) 500 PSI (D) 1,000 PSI - ANSWER-(C) 500 PSI A weight belt should be put on with a XXX hand release. - ANSWER-Right A. Define Thermocline B. Give an example - ANSWER-A. A layer of water that separates warmer surface water from cold deep water. B. Air temperature could be 85 degrees, Water temperature could be 81 degrees. But water at the bottom could be 51 degrees. A. Describe Boyle's Law B. Why is this important to a diver? - ANSWER-A. If pressure increases, then volume decreases, and vice versa. B. Boyle's law can be used to determine the effect of depth on air consumption and it can be used to prevent diving related injuries. A. How much faster does sound move underwater than in the air? B. Why is this important to a diver? - ANSWER-A. Sound moves 4X faster in water than air due to the density of the water. B. It's difficult for the diver to tell which direction sound is coming from, or how far away it is. This can be especially dangerous when you hear a boat overhead. A. How much larger and closer do items appear underwater? B. Why is this important to a diver? - ANSWER-A. 33% Larger and 25% Closer B. Visual distortion may be disorienting to a diver and can cause dizziness.

A. In Pocatello Idaho (abt 4,000 feet), what is the atmospheric pressure (PSI) on land? B. How deep would you need to dive to equal 1 atm if diving in Pocatello, ID? - ANSWER-A. About 12.7 PSI B. About 26 ft. A. Water conducts heat away from the body about XXX percent faster than air. B. Why does this matter to a diver? - ANSWER-A. 25% B. It's much easier to experience cold related injuries (such as hypothermia) underwater than on land. Always plan ahead and wear a wetsuit or drysuit as necessary to prevent injury. A. Water that contains a large quantity of suspended particles is said to be XXX. B. Why does this matter to a diver? - ANSWER-A. Turbid B. Turbid water reduces visibility and poses more danger to a diver than clear water. It becomes easier to get lost and lose sight of other divers. A. Waves are usually caused by ______________________. B. How are waves dangerous to a diver? - ANSWER-A. Wind B. Waves on the surface cause "surge" underneath. In a strong surge, a diver has little control over which direction to swim and can be thrown into underwater formations. A. What types of marine life cause the most diving injuries? B. What do most marine life diving injuries consist of? - ANSWER-A. Fire Coral, Jelly Fish, Fish on the sea floor B. Painful, temporary stings and abraisions After diving you should always do what with your mask, fins, and snorkel. - ANSWER- Rinse them well in fresh water to reduce degridation of the materials. After returning to the surface, before you take the regulator out of your mouth you should... - ANSWER-Add air to the BCD to achieve positive buoyancy Anytime the regulator leaves your mouth underwater you should... - ANSWER-Exhale Atmospheric pressure is 14.7 PSI at sea level. What is the absolute pressure at a depth of 33 feet? - ANSWER-29.4 PSI Define Maximum Dive Depth. - ANSWER-The deepest point reached during a dive Define No-Stop Time or No-Stop Dive. - ANSWER-A dive during which you can safely ascend straight to the surface with no decompression stops.

List 3 components of a compass - ANSWER-1. North Label 2. Lubber line 3. Housing w/360 degree marks 4. Needle 5. Magnetic or Digital Components List 3 different reasons that it is advisable to check with your local dive center before conducting a dive you're unfamiliar with. - ANSWER-1. Find out local laws

  1. Find out about typical environmental conditions
  2. Find out about dangerous indigenous animals and appropriate first aid. List 3 important scuba diving changes that occurred in the 1950's. - ANSWER-1. US Navy Dive tables published in 1957
  3. First personal dive computer invented in 1959
  4. Dramatic improvements in personal diving equipment List 4 functions of a dive computer. - ANSWER-1. No Decompression Limit 2. Current Depth 3. Max Depth 4. Dive Time 5. Ascent Rate 6. Required Decompression 7. Surface Interval Time 8. Time to Fly 9. Logbook 10. Bottom Time List and describe the 3 types of boyancy - ANSWER-1. Positive buoyancy - floating at the surface
  5. Neutral buoyancy- remains at constant depth, neither floating or sinking
  6. Negative buoyancy- sinking List at least 5 factors that can predispose a diver to decompression sickness. - ANSWER-1. Obesity
  7. Age
  8. Illness
  9. Past/Present Injuries
  10. Prior History of DCS
  11. Fatigue
  12. Dehydration
  13. Smoke inhalation
  14. Use of drugs/alcohol prior to dive
  15. Repetative Dives
  16. Overexertion
  17. Cold Water
  18. Diving at higher altitudes List two possible ways a diver may feel if they become "narked" at depth. - ANSWER- Extreme Euphoria Extreme Anxiety Name 2 basic fin designs and describe the main features of each. - ANSWER-1. Open Heel - Necessary when diving in cold water to enable the diver to wear neoprene boots. Also adjustable sizes are available. 2. Full Foot - Must be exact fit. But, allow more efficient use of leg muscles.

Name 2 functions of wet boots - ANSWER-1. Protection against abrasions 2. Warmth Name at least 1 visual and 1 audible rescue signaling device. - ANSWER-1. Whistles 2. Horns 3. Inflatable Tube 4. Inflatable Lift Bag State the guages that a console might hold. - ANSWER-1. Submersible Pressure Gauge (SPG) 2. Depth Gauge 3. Compass The correct time to begin equalizing your ears is (A) When you feel pressure (B) Early and often (C) 3 feet below the surface - ANSWER-(B) Early and often The scuba tank is normally filled with (A) Oxygen (B) Nitrox (C) Air - ANSWER-(C) Air To prevent injury it is important to equalize at the _________________ before you dive, and then every couple of feet thereafter. - ANSWER-surface True or False: You should anticipate surge action to avoid contact with stationary objects. - ANSWER-True: If you experience strong surge, it's best to avoid underwater formations and swim to deeper water where the surge is weaker. True or False: You should equalize before beginning descent at the surface and continue to equalize every couple of feet thereafter. - ANSWER-True. Equalize early and often. What are 2 types of weight systems? - ANSWER-1. Belts 2. Pouches on the BCD What are 2 ways a PDC may alert a diver that he/she is ascending too fast? - ANSWER-1. Visual Alarms 2. Audible Alarms What are the 2 main modes of operation of a dive computer? - ANSWER-1. Surface Mode 2. Dive Mode What are the 2 types of dive flags commonly flown from a dive boat? - ANSWER-1. Diver Down Flag (red & white) 2. International Flag (blue & white) What causes you to want breath? - ANSWER-Build up of carbon dioxide What does SCUBA stand for? - ANSWER-Self Contained Underwater

What should a diver do to alleviate the symptoms of nitrogen narcosis? - ANSWER- Ascend normally until you no longer feel the affects What should you do if visual distortion underwater causes you to become disoriented or dizzy? - ANSWER-Grab hold of a stationary object and wait. Once you have regained your sense of direction, continue with the dive. What should you do if you experience a reverse block upon ascending? - ANSWER- Descend a few feet until the pain subsides. Wait a few moments. Then, ascend again. What should you do if you experience discomfort in your ears while descending? - ANSWER-Stop descent, ascend a few feet. Equalize, then descend again. What should you do if you hear a boat overhead? - ANSWER-Because sound travels differently in water it's difficult to tell the distance or direction of the source of sounds. If you hear a boat you should stay down until the sound disappears. Then surface to your dive flag or dive vessel. What should you do if you see a potentially dangerous animal underwater and it does not leave the area? - ANSWER-Avoid touching sea life. Always respect the environment. Be aware. What should you do if you suddenly feel sick and develop a headache during a dive? - ANSWER-Make a controlled ascent to the surface. Breath fresh oxygen or air until the symptoms clear up. If symptoms do not clear up, seek immediate medical attention. What will be the volume in a ball that is filled with two cubic feet of air at 99 feet when it's taken to the surface? - ANSWER-8 cubic feet When a scuba diver holds his/her breath on ascent, he/she may: (A) Experience decompression sickness (B) Rupture his/her lungs (C) Suffer an air embolism (D) Die - ANSWER-(B) Rupture his/her lungs (C) Suffer an air embolism (D) Die When diving from the shore, the best time to dive is when there is the least amount of tidal current. _______________________ tide is when there is no horizontal water movement. - ANSWER-Slack

Which gas causes extreme headache and nausea, and in high enough concentrations causes unconciousness and the lips and fingernails to turn bright red? - ANSWER- Carbon Monoxide Which gas component in air causes decompression sickness and narcosis? - ANSWER-Nitrogen With a weight belt, the excess length should be XXX inches - ANSWER-4-6 inches You are wearing a 1/4" wetsuit, you have left the surface and descent has begun. You will need to do what? Explain your choice. (A) Change the weights on the weight belt (B) Let the air out of the BCD (C) Add air to the BCD - ANSWER-(C) Add air to the BCD The deeper you descend the more the cells in the wet suit compress thus displacing less water. When this happens you become less buoyant and will need to add air to the BCD to bring yourself back to neutral buoyancy.