Group designation letter ✔✔The letter assigned after a dive which indicates the amount of residual nitrogen remaining in the diver's tissues is
... [Show More] called the ______ ______ ______.
10 12 ✔✔Any dive started more than ______ minutes and less than ______ hours after a previous scuba dive is called a repetitive dive.
Excessive beginning ✔✔Residual time (RT) is defined as ______ nitrogen pressure still residual in the diver at the ______ of a repetitive dive.
Water between ✔✔The surface interval (SI) is defined as the amount of time the Divers stays out of the ______ or on the surface ______ dives.
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) ✔✔ 10 cu ft
Earplugs ✔✔ Should never be worn when diving
Proper equalization techniques must be learned in order to: ✔✔ 1) Prevent squeeze injuries
2) Prevent ear pain
3) Prevent sinus squeeze
The purpose of equalization is to: ✔✔ 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. ✔✔ 0 and 33 feet
Underwater, the bending of light rays causes objects to appear to be: ✔✔ Closer
The first symptom of a sinus squeeze is usually: ✔✔ A sharp pain or wedging sensation above the eyes
Describing diving with the acronym SCUBA came from what event? ✔✔ The development of the demand regulator in 1943
Sinus squeeze can be prevented by: ✔✔ Not diving with a cold
Gauge pressure is defined as: ✔✔ Absolute pressure minus 1 ATA
The absolute pressure expressed in terms of atmospheres absolute at 99 feet in salt water is: ✔✔ 4 ata
Body heat is lost underwater _____ than on air. ✔✔ 25-30 times faster
What is true concerning sound transmission underwater? ✔✔ 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: ✔✔ 2 ata
Ear squeeze can be prevented by: ✔✔ 1) Never diving with a cold
2) Relaxing
3) Rotating the jaw, swallowing, or valsalva
One atmosphere of pressure is defined as: ✔✔ 1) 1 ATA
2) Each 34ft Depth of Fresh water
3) Each 33ft Depth of Salt water
The condition in which certain colors are diminished as depth increases is called: ✔✔ Absorption
Salt water weighs ______ pounds per cubic foot and freshwater weighs ______ pounds per cubic foot. ✔✔ 64/62.5
Salt water weighs 64 pounds per cubic foot
Freshwater weighs 62.5 pounds per cubic foot
Absolute pressure is defined as: ✔✔ The total pressure exerted on an object
If you experience pain in your ears during descent: ✔✔ Stop the decent and ascend until the pain stops
Describing diving with the acronym SCUBA came from what event? ✔✔ The development of the demand regulator in 1943.
Earplugs: ✔✔ Should never be worn while diving.
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) ✔✔ 10 cu
Absolute pressure is defined as: ✔✔ The total pressure exerted on an object.
The greatest relative pressure change in sea water takes place between ____ and ____ feet. ✔✔ 0/33 ft
One atmosphere of pressure is defined as: ✔✔ Each 33 ft of depth in seawater; 34 ft of depth in freshwater; 1 ATA
Underwater, the bending of light rays causes objects to appear to be: ✔✔ Closer.
If you experience pain in your ears during descent: ✔✔ Stop the descent and ascend until the pain stops.
The absolute pressure expressed in terms of atmospheres absolute at 33 feet in sea water is: ✔✔ 2 ATA
Ear Squeeze can be prevented by: ✔✔ Relaxing; never diving with a cold; and rotating the jaw, swallowing, or Valsalva
The condition in which certain colors are diminished as depth increases is called: ✔✔ Absorption.
Gauge pressure is defined as: ✔✔ Absolute pressure minus 1 ATA [Show Less]