SSI Scuba Open Water Diving Certification – Study Guide, Key Concepts & Practice Questions
Review
The purpose of equalization is to - correct answer ✔✔Introduce additional air into body air
spaces in response to increasing external pressure
Body heat is lost ________ than in air - correct answer ✔✔25 to 30 times faster
The absolute pressure expressed in terms of atmospheres absolute at 99 feet in salt water -
correct answer ✔✔4 ata
One atmosphere of pressure is defined as - correct answer ✔✔- Each 34 feet of depth in
freshwater
- 1 ata
- Each 33 feet of depth in sea water
Describing diving with the acronym SCUBA came from what event? - correct answer ✔✔The
development of the demand regulator in 1943
Sinus squeeze can be prevented by - correct answer ✔✔Not diving with a cold
The greatest relative pressure change in sea water takes place between ___ and ___ feet -
correct answer ✔✔0 and 33
Underwater, the bending of light rays causes objects to appear to be: - correct answer
✔✔closer
Ear squeeze can be prevented by: - correct answer ✔✔- Relaxing
, - Never diving with a cold
- Rotating the jaw, swallowing, or Valsalva
Earplugs... - correct answer ✔✔should never been worn while diving
If you experience pain in your ears during descent: - correct answer ✔✔Stop the descent and
ascend until the pain stops
Which of the statements concerning sound transmission underwater is correct? - correct
answer ✔✔- Divers find it difficult to locate the direction of a sound producing source
- Sound will travel farther underwater than in air
- Sound travels four times faster underwater than in air
The absolute pressure expressed in terms of atmospheres absolute at 33 feet in sea water is -
correct answer ✔✔2 ata
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? - correct answer ✔✔10 cu ft
Gauge pressure is defined as: - correct answer ✔✔Absolute pressure minus one
The condition in which certain colors are diminished as depth increases is called: - correct
answer ✔✔Absorption
your Delivery system should be serviced and preformance checked: - correct answer ✔✔every
year
Review
The purpose of equalization is to - correct answer ✔✔Introduce additional air into body air
spaces in response to increasing external pressure
Body heat is lost ________ than in air - correct answer ✔✔25 to 30 times faster
The absolute pressure expressed in terms of atmospheres absolute at 99 feet in salt water -
correct answer ✔✔4 ata
One atmosphere of pressure is defined as - correct answer ✔✔- Each 34 feet of depth in
freshwater
- 1 ata
- Each 33 feet of depth in sea water
Describing diving with the acronym SCUBA came from what event? - correct answer ✔✔The
development of the demand regulator in 1943
Sinus squeeze can be prevented by - correct answer ✔✔Not diving with a cold
The greatest relative pressure change in sea water takes place between ___ and ___ feet -
correct answer ✔✔0 and 33
Underwater, the bending of light rays causes objects to appear to be: - correct answer
✔✔closer
Ear squeeze can be prevented by: - correct answer ✔✔- Relaxing
, - Never diving with a cold
- Rotating the jaw, swallowing, or Valsalva
Earplugs... - correct answer ✔✔should never been worn while diving
If you experience pain in your ears during descent: - correct answer ✔✔Stop the descent and
ascend until the pain stops
Which of the statements concerning sound transmission underwater is correct? - correct
answer ✔✔- Divers find it difficult to locate the direction of a sound producing source
- Sound will travel farther underwater than in air
- Sound travels four times faster underwater than in air
The absolute pressure expressed in terms of atmospheres absolute at 33 feet in sea water is -
correct answer ✔✔2 ata
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? - correct answer ✔✔10 cu ft
Gauge pressure is defined as: - correct answer ✔✔Absolute pressure minus one
The condition in which certain colors are diminished as depth increases is called: - correct
answer ✔✔Absorption
your Delivery system should be serviced and preformance checked: - correct answer ✔✔every
year
