SSI Open Water Diver – Section 1 Study Guide, Key Concepts & Practice Questions Review
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) - correct answer ✔✔10 cu ft
Earplugs - correct answer ✔✔Should never be worn when diving
Proper equalization techniques must be learned in order to: - correct answer ✔✔1) Prevent
squeeze injuries
2) Prevent ear pain
3) Prevent sinus squeeze
The purpose of equalization is to: - correct 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. -
correct answer ✔✔0 and 33 feet
Underwater, the bending of light rays causes objects to appear to be: - correct answer
✔✔Closer
The first symptom of a sinus squeeze is usually: - correct answer ✔✔A sharp pain or wedging
sensation above the eyes
Describing diving with the acronym SCUBA came from what event? - correct answer ✔✔The
development of the demand regulator in 1943
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) - correct answer ✔✔10 cu ft
Earplugs - correct answer ✔✔Should never be worn when diving
Proper equalization techniques must be learned in order to: - correct answer ✔✔1) Prevent
squeeze injuries
2) Prevent ear pain
3) Prevent sinus squeeze
The purpose of equalization is to: - correct 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. -
correct answer ✔✔0 and 33 feet
Underwater, the bending of light rays causes objects to appear to be: - correct answer
✔✔Closer
The first symptom of a sinus squeeze is usually: - correct answer ✔✔A sharp pain or wedging
sensation above the eyes
Describing diving with the acronym SCUBA came from what event? - correct answer ✔✔The
development of the demand regulator in 1943
