SSI Open Water Diver - Section 1 Exam

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 ft Earplugs - Answer- Should never be worn when diving Proper equalization techniques must be learned in order to: - Answer- 1) Prevent squeeze injuries 2) Prevent ear pain 3) Prevent sinus squeeze The purpose of equalization is to: - Answer- Introduce additional air into body air spaces in response to increasing external pressure The greatest relative pressure change in sea water takes place between ___ and ___ feet. - Answer- 0 and 33 feet Underwater, the bending of light rays causes objects to appear to be: - Answer- Closer The first symptom of a sinus squeeze is usually: - Answer- A sharp pain or wedging sensation above the eyes Describing diving with the acronym SCUBA came from what event? - Answer- The development of the demand regulator in 1943 Sinus squeeze can be prevented by: - Answer- Not diving with a cold Gauge pressure is defined as: - Answer- Absolute pressure minus 1 ATA The absolute pressure expressed in terms of atmospheres absolute at 99 feet in salt water is: - Answer- 4 ata Body heat is lost underwater _____ than on air. - Answer- 25-30 times faster What is true concerning sound transmission underwater? - Answer- 1) Divers find it difficult to locate the direction of a sound producing source. 2) Sound travels four times faster underwater than in air. 3) Sound will travel farther underwater than in air. 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- 1) Never diving with a cold 2) Relaxing 3) Rotating the jaw, swallowing, or valsalva One atmosphere of pressure is de