NAUI SCUBA
At a minimum, while diving, most dive computers display: - Answer- Maximum depth, current depth, actual bottom time, remaining allowable bottom time.
Which of the following is an essential feature to consider when selecting a diving mask? - Answer- Tempered or safety glass
Snor...
NAUI SCUBA
At a minimum, while diving, most dive computers display: - Answer- Maximum depth,
current depth, actual bottom time, remaining allowable bottom time.
Which of the following is an essential feature to consider when selecting a diving
mask? - Answer- Tempered or safety glass
Snorkels over 15 inches (38 centimeters) in length are not recommended primarily
because: - Answer- They have too much dead air space.
When buying or renting equipment for diving, the most important consideration is: -
Answer- Its fit on your body.
When rinsing a regulator it is best to: - Answer- Leave the regulator attached to the
tank or have the dust cap in place.
Three features that are common to all buoyancy control devices are: - Answer- An
overpressure relief valve, inflation/deflation hose, low pressure inflator hose.
Three types of alternate air sources that are in common use today are: - Answer-
Octopus rigs, completely redundant systems, an integrated regulator into the BCD
inflation/deflation hose.
According to the United States Department of Transportation regulations, scuba
tanks must be hydrostatically tested every: - Answer- 5 years
The most important functional feature of a weight belt or weight system is: - Answer-
A means for ditching the weights immediately with one hand.
The primary purpose of the exposure suit is to: - Answer- Preserve body heat during
dives.
You should have your regulator serviced by a certified repair technician: - Answer- At
least once per year.
The stage of the regulator which reduces tank pressure is: - Answer- first
Two types of materials that scuba tanks are made from are steel and _________. -
Answer- aluminum
The _________ line is the direction of travel line on the compass. - Answer- lubber
The dive knife is used primarily as a _________ for digging, cutting, pounding and
prying. - Answer- Tool
Markings on scuba tanks include: - Answer- Date of hydrostatic test, serial number,
type of material.
, Atmospheric pressure at sea level is: - Answer- 14.7 pounds per square inch/1.0
atmosphere absolute (1.01 bar).
A sealed balloon filled with air that has a volume of 4 liters at 99 feet of seawater
(30.2 m) will have a volume of ____________ liters at 33 feet of seawater (10.1 m). -
Answer- 8 liters
The weight of freshwater is: - Answer- 62.4 pounds per cubic foot (1000 kg/m3).
Air, the gas most commonly used by recreational scuba divers, is composed of: -
Answer- 78% nitrogen, 21% oxygen, trace gasses.
Which of the following causes objects to appear larger and closer when looking
through a mask during a dive? - Answer- Refraction
Sound travels approximately how many times faster in water than in air? - Answer- 4
A diver's body heat is lost through conduction (primarily) at a rate of approximately
_________ times more rapidly than in air. - Answer- 25
Which of the following actions should a diver take to reduce drag and therefore the
amount exertion during a dive? - Answer- Streamline his/her body position.
The absolute pressure in the ocean at 53 feet (16.15 m) is: - Answer- 2.6
atmospheres absolute (2.6 bar).
If a diver's surface air consumption rate is 30 psi per minute (2.1 bar per minute),
what would be his/her consumption rate at 66 feet (20.11 m) of seawater? - Answer-
90 psi per minute (6.2 bar per minute).
A depth that is equivalent to one atmosphere in the ocean is equal to _________
feet (meters) in seawater and _________ feet (meters) in freshwater. - Answer- 33;
34 (10.06;10.36)
Two methods of measuring air pressure are BAR or: - Answer- PSI
Which of the following describes the term "positive buoyancy"? - Answer- An object
displaces an amount of water weighing more than itself.
Three factors that adversely affect a diver's air consumption rate are: - Answer-
Large physical size, high anxiety, poor fitness level.
Pressure in the middle ear is equalized through a part of the body called the: -
Answer- Eustachian tube
A scuba diver tends to become dehydrated while diving due to: - Answer-
Moisturizing dry inhaled air.
Symptoms of Nitrogen Narcosis are similar to: - Answer- Alcohol intoxication.
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