SSI Open Water Diver Final Exam Study Guide Section 1 Questions and Answers

Describing diving with the acronym SCUBA came from what event? - Answer- The development of the demand regulator in 1943. Earplugs: - Answer- Should never be worn while diving. If a flexible air-filled container has a volume of 40 cu ft on the surface, what would the volume be at 99 feet in sea water? (rounded off) - Answer- 10 cu Absolute pressure is defined as: - Answer- The total pressure exerted on an object. The greatest relative pressure change in sea water takes place between ____ and ____ feet. - Answer- 0/33 ft One atmosphere of pressure is defined as: - Answer- Each 33 ft of depth in seawater; 34 ft of depth in freshwater; 1 ATA Underwater, the bending of light rays causes objects to appear to be: - Answer- Closer. If you experience pain in your ears during descent: - Answer- Stop the descent and ascend until the pain stops. The absolute pressure expressed in terms of atmospheres absolute at 33 feet in sea water is: - Answer- 2 ATA Ear Squeeze can be prevented by: - Answer- Relaxing; never diving with a cold; and rotating the jaw, swallowing, or Valsalva The condition in which certain colors are diminished as depth increases is called: - Answer- Absorption. Gauge pressure is defined as: - Answer- Absolute pressure minus 1 ATA Sinus squeeze can be prevented by: - Answer- Not diving with a cold. Which of the statements concerning sound transmission underwater is correct? - Answer- Sound travels four times faster in water than in air; sound travels farther underwater than air; divers find it difficult to locate the source of the sound underwater. The first symptom of a sinus squeeze is usually: - Answer- A sharp pain of wedging sensation above the eyes. The purpose of equalization is to: - Answer- Introduce additional air into body air spaces in response to increasing external pressure. Salt water weighs ___ pounds per cubic foot and freshwater weighs ___ pounds per cubic foot. - Answer- 64/62.5 Body heat is lost underwater ___ than in air. - Answer- 25-30x faster. The absolute pressure expressed in terms of atmospheres absolute at 99 feet in salt water is: - Answer- 4 ATA Proper equalization techniques must be learned in order to: - Answer- Prevent squeeze injuries, sinus squeeze and ear pain. The 6 Systems of Diving Equipment and Gear: - Answer- Six Systems: Snorkel, Exposure, Delivery, Information, Buoyancy and Accessory. Snorkel System components: - Answer- Mask, fins, boots, mesh bag, and snorkel. Exposure System components: - Answer- Insulated suit, mitts or gloves and a dive hood. Delivery System components: - Answer- Life support equipment for receiving air while underwater. Information system components: - Answer- Dive computer which allows you to measure air, depth, time, temperature, ascent and descent rates, and repetitive dives. Buoyancy system components: - Answer- Part of the life support equipment and helps you achieve optimal buoyancy during each dive, including surface flotation, controlled descents, proper swimming attitude at depth and controlled ascents back to the surface. Has a visual and audible signaling device and shears or a knife. Many BC's are weighted. Accessory components: - Answer- Special tools, repair parts, cleaners, cameras, lights, navigation, etc. to make diving more enjoyable and unique to you. Historical event that led to the use of acronym SCUBA: - Answer- 1. 1943, Jacques Cousteau, French Naval Officer, and partner Emile Gagnan, developed the demand regulator which enabled a diver to breathe air at the proper pressure for their depth in the amount needed. This allowed divers to dive independently and self-contained with a life support system for the first time. 2. With this development, plus high-pressure compressors and cylinders created the SCUBA acronym - Self-Contained Underwater Breathing Apparatus. 3. During this time (1900's), though, there was no formal training in how to dive and most sport divers were very fit peop