Exam (elaborations)
NAUI SCUBA Exam
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Exam of 6 pages for the course NAUI SCUBA at NAUI SCUBA (NAUI SCUBA Exam)
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NAUI SCUBA ExamAt 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
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