SSI Open Water Diver Final Exam with complete solutions

Which of the statements concerning sound transmission underwater is incorrect? -A: Sound will travel farther underwater then in air -B: Divers find it difficult to locate the direction of a sound producing source -C: Divers find it easy to talk to each other directly through water -D: Sound travels four times faster underwater than in air - Answer- C The absolute pressure expressed in terms of atmospheres absolute at 33 feet in sea water is: -A: 2 ata -B:1 ata -C: 4 ata -D: 3 ata - Answer- A The condition in which certain colors are diminished as depth increases is called: -A: Refraction -B: Turbidity -C: Diffusion -D: Absorption - Answer- D Earplugs: -A: Aid equalization of the middle of the ear -B: Protect against cold -C: Should never be worn while diving -D: Protect ears from squeeze - Answer- C Gauge pressure is defined as: -A: Hydrostatic pressure minus 1 ata -B: The pressure at the surface -C: The depth reading on a gauge -D: Absolute pressure minus 1 ata - Answer- D Sinus squeeze can be prevented by: -A: Valsalva technique -B: Wearing earplugs -C: Tilting the divers head back and forth -D: Not diving with a cold - Answer- D The event that led to the use of the acronym SCUBA to describe diving was: Development of what and when? - Answer- Demand regulator in 1943 Ear squeeze can be prevented by -A: Relaxing -B: All answers are correct -C: Never diving with a cold -D: rotating the jaw, swallowing or Valsalva - Answer- B The first symptom of a sinus squeeze is usually: -A: a dull pain deep within the head -B: a sharp pain at the base of the neck -C: a crushing pain high in the chest -D: a sharp pain above the eyes - Answer- D If you experience pain in the ear during descent: -A: Stop the descent and ascend till the pain stops -B: abort the dive -C: place a finger in the ear canal and gently massage the ear until the pain ceases -D: continue the descent while gently exhaling into the mask - Answer- A Body heat is lost at a rate of ___ than air. - Answer- 25-30 times faster Proper equalization techniques must be learned in order to: -A: prevent sinus squeeze -B: prevent ear pain -C: prevent squeeze injuries -D: all answers are correct - Answer- D Salt water weighs ___ pounds per cubic foot and freshwater weighs ___ pounds per cubic foot. - Answer- 64/62.5 Underwater, the bending of light rays causes objects to appear to be: - Answer- Closer The purpose of equalization is to: -A: ensure the uneven application of pressure between the water and air spaces in the body -B: prevent water from entering air spaces in the body -C: introduce additional air into body air spaces in response to increasing external pressure -D: remove all fluids from body air spaces - Answer- C One atmosphere of pressure is defined as -A: 1 ata -B: each 34ft of depth in freshwater -C: each 33ft of depth in saltwater -D: all answers are correct - Answer- D The three primary features to look for in a quality Exposure System are: - Answer- Thickness, fit, seam integrity An object immersed in water will be buoyed upward by a force ______ to the weight of the water it displaces. - Answer- equal A high pressure scuba cylinder should be stored: -A: secured with a minimum of 500 to 750 psi -B: lying flat with no air -C: with the valve slightly open to allow air expansion -D: secured with the valve open - Answer- A The most efficient breathing pattern for scuba diving is: - Answer- Deep inhale/exhale One of the primary factors contributing to heat loss for divers is: -A: Absorption -B: Convection -C: Diffusion -D: Refraction - Answer- B The Information System components are: A: Dive Computer B: Analogue Instruments C: SSI DiveLog D: All the above - Answer- D The purpose of a BC is to: