SSI FINAL STUDY GUIDE 2026
COMPLETE QUESTIONS AND ANSWERS.
◍ The first symptom of a sinus squeeze is usually. Ans: A sharp pain or
wedging sensation above the eyes
◍ Absolute Pressure. Ans: The total pressure exerted on an object
◍ The purpose of equalization is to. Ans: Introduce additional air into
body air spaces in response to increasing external pressure
◍ 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). Ans: 10 cu ft
◍ The greatest relative pressure change in sea water takes place between
____ and ____ feet. Ans: 0/33
◍ Which of the statements concerning sound transmission underwater is
correct. Ans: Difficult to locate direction
Sound travels 4x faster
Sound will travel farther
, ◍ Body heat is lost underwater ___ than in air. Ans: 25-30 times faster
◍ Salt water weighs ___ pounds per cubic foot and freshwater weighs
___ pounds per cubic foot. Ans: 64/62.5
◍ Gauge pressure. Ans: Absolute pressure minus 1 ata
◍ The absolute pressure expressed in terms of atmospheres absolute at
33 feet in sea water is. Ans: 2 ata
◍ Describing diving with the acronym SCUBA came from what event?
Ans: The development of the demand regulator in 1943
◍ One of the primary factors contributing to heat loss for divers is. Ans:
Convection
◍ The Buoyancy Control System components are. Ans: Buoyancy
compensator, inflation device, and weight belt or BC weight pockets
◍ A scuba cylinder must be hydrostatically tested. Ans: Within fixed
intervals set by local law
COMPLETE QUESTIONS AND ANSWERS.
◍ The first symptom of a sinus squeeze is usually. Ans: A sharp pain or
wedging sensation above the eyes
◍ Absolute Pressure. Ans: The total pressure exerted on an object
◍ The purpose of equalization is to. Ans: Introduce additional air into
body air spaces in response to increasing external pressure
◍ 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). Ans: 10 cu ft
◍ The greatest relative pressure change in sea water takes place between
____ and ____ feet. Ans: 0/33
◍ Which of the statements concerning sound transmission underwater is
correct. Ans: Difficult to locate direction
Sound travels 4x faster
Sound will travel farther
, ◍ Body heat is lost underwater ___ than in air. Ans: 25-30 times faster
◍ Salt water weighs ___ pounds per cubic foot and freshwater weighs
___ pounds per cubic foot. Ans: 64/62.5
◍ Gauge pressure. Ans: Absolute pressure minus 1 ata
◍ The absolute pressure expressed in terms of atmospheres absolute at
33 feet in sea water is. Ans: 2 ata
◍ Describing diving with the acronym SCUBA came from what event?
Ans: The development of the demand regulator in 1943
◍ One of the primary factors contributing to heat loss for divers is. Ans:
Convection
◍ The Buoyancy Control System components are. Ans: Buoyancy
compensator, inflation device, and weight belt or BC weight pockets
◍ A scuba cylinder must be hydrostatically tested. Ans: Within fixed
intervals set by local law
