question

Which of the following is an essential feature to consider when selecting a diving mask?

answer

Tempered or safety glass

question

Snorkels over 15 inches (38 centimeters) in length are not recommended primarily because:

answer

They have too much dead air space.

question

When buying or renting equipment for diving, the most important consideration is:

answer

Its fit on your body.

question

When rinsing a regulator it is best to:

answer

Leave the regulator attached to the tank or have the dust cap in place.

question

Three features that are common to all buoyancy control devices are:

answer

An overpressure relief valve, inflation/deflation hose, low pressure inflator hose.

question

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.

question

According to the United States Department of Transportation regulations, scuba tanks must be hydrostatically tested every:

answer

5 years

question

The most important functional feature of a weight belt or weight system is:

answer

A means for ditching the weights immediately with one hand.

question

The primary purpose of the exposure suit is to:

answer

Preserve body heat during dives.

question

At a minimum, while diving, most dive computers display:

answer

Maximum depth, current depth, actual bottom time, remaining allowable bottom time.

question

You should have your regulator serviced by a certified repair technician:

answer

At least once per year.

question

The stage of the regulator which reduces tank pressure is:

answer

first

question

Two types of materials that scuba tanks are made from are steel and _________.

answer

aluminum

question

The _________ line is the direction of travel line on the compass.

answer

lubber

question

The dive knife is used primarily as a _________ for digging, cutting, pounding and prying.

answer

Tool

question

Markings on scuba tanks include:

answer

Date of hydrostatic test, serial number, type of material.

question

Atmospheric pressure at sea level is:

answer

14.7 pounds per square inch/1.0 atmosphere absolute (1.01 bar).

question

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

question

The weight of freshwater is:

answer

62.4 pounds per cubic foot (1000 kg/m3).

question

Air, the gas most commonly used by recreational scuba divers, is composed of:

answer

78% nitrogen, 21% oxygen, trace gasses.

question

Which of the following causes objects to appear larger and closer when looking through a mask during a dive?

answer

Refraction

question

Sound travels approximately how many times faster in water than in air?

answer

4

question

A diver's body heat is lost through conduction (primarily) at a rate of approximately _________ times more rapidly than in air.

answer

25

question

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.

question

The absolute pressure in the ocean at 53 feet (16.15 m) is:

answer

2.6 atmospheres absolute (2.6 bar).

question

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).

question

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)

question

Two methods of measuring air pressure are BAR or:

answer

PSI

question

Which of the following describes the term "positive buoyancy"?

answer

An object displaces an amount of water weighing more than itself.

question

Three factors that adversely affect a diver's air consumption rate are:

answer

Large physical size, high anxiety, poor fitness level.

question

Pressure in the middle ear is equalized through a part of the body called the:

answer

Eustachian tube

question

A scuba diver tends to become dehydrated while diving due to:

answer

Moisturizing dry inhaled air.

question

Symptoms of Nitrogen Narcosis are similar to:

answer

Alcohol intoxication.

question

A diver's inability to equalize his/her ears during descent could cause:

answer

Ear squeeze

question

An irregular breathing pattern (skip breathing) while diving will possibly cause:

answer

Carbon dioxide excess.

question

Generally, for maximum efficiency, your breathing should be:

answer

Slightly slower and deeper than you normally breathe.

question

To prevent air embolism, a diver should:

answer

Breathe normally at all times during ascent and never hold his/her breath.

question

A diver with blood and mucous in his/her mask upon surfacing will most likely have:

answer

Sinus squeeze

question

If your dive buddy complains to you about having aching pain in his/her shoulder one hour after the dive, you might suspect:

answer

Decompression sickness.

question

A symptom of hypothermia which indicates that a diver should terminate his/her dive is:

answer

Shivering

question

Which of the following activities is most appropriate for re-establishing or maintaining an adequate fitness level for safe diving?

answer

Workouts in a pool with mask, fins, and snorkel 3 times per week.

question

Which of the following is the point at which a sudden change in water temperature occurs?

answer

A thermocline.

question

Three general categories of currents are:

answer

Standing, Tidal, Transitory.

question

A dive team caught in a rip current taking them in a direction they do not want to go, should:

answer

Swim at a right angle to the current.

question

Two ways that tidal action affect diving conditions include:

answer

Entry and exit conditions may change and tidal currents may become quite strong.

question

Most surface waves are caused by:

answer

Wind

question

Examples of natural navigation aids divers may use during dives include:

answer

Ripple marks in the sand. Sun brightness/available light. Bottom contours.

question

Almost all injuries from aquatic life are caused by _________ action on the part of the animal.

answer

defensive

question

To render first aid for stings such as those from jellyfish:

answer

Removal of stinging material and application of a neutralizing agent.

question

Which buddy system technique is recommended when diving in limited visibility?

answer

Holding hands or use a buddy line.

question

A diver with a group letter of "D" making a dive to 60 feet of seawater (18.24 m) has a residual nitrogen time of:

answer

24 minutes

question

It is advisable that a sport/recreational diver:

answer

Avoid decompression dives.

question

For optimum no-decompression bottom times, plan repetitive dives so that each successive dive is to _________ depth.

answer

a shallower

question

The maximum dive time for a dive to 65 feet of seawater (19.76 m) is _________ minutes.

answer

45

question

The minimum surface interval required to avoid stage decompression after a dive to 70 feet of freshwater (20.8 m) for 35 minutes, followed by a dive to 55 feet of freshwater (16.33 m) for 23 minutes is:

answer

1 hr, 16 minutes

question

According to NAUI, a repetitive dive is defined as more than one dive within a period of _________ hours.

answer

24

question

The minimum surface interval recommended between two dives is _________ minutes.

answer

60

question

Your first dive is to 60 feet of seawater (18.24 m) for 50 minutes. You spend one hour and 40 minutes on the surface, what is your adjusted maximum dive time at 60 feet of seawater (18.24 m)?

answer

19 minutes

question

A buddy team in a NAUI Master Scuba Diver Course makes an ocean dive to 100 feet (30.4 m) for 18 minutes. After a surface interval of 2 hours and 35 minutes, they make a repetitive dive to 70 feet (21.2 m) for 24 minutes. They remain on the surface for 2 hours and 51 minutes before diving to 45 feet (13.68 m). What is their adjusted maximum dive time for the third dive?

answer

51 minutes

question

According to NAUI, how long should you wait before flying after conservative diving?

answer

12-24 hours

question

If your buddy is in distress at the surface, three recommended actions to take are:

answer

Safely establish buoyancy for your buddy, get him/her to relax or rest, tow him/her to the shore/boat.

question

Four main actions you should consider in giving first aid for diving accidents are:

answer

Maintain basic life support, call for help, treat for shock, deliver 100% oxygen.

question

Which of the following will help to prevent seasickness?

answer

Settle yourself in a midway point of the boat.

question

Which of the following is a hazard when diving in limited visibility or at night?

answer

Vertigo.

question

If you are diving wearing an exposure suit, you should _________to safely control buoyancy as you descend.

answer

add air to your buoyancy device

question

Which of the following limits should be established prior to every scuba dive?

answer

Maximum bottom time, maximum depth, minimum air pressure.

question

Which of the following physical factors can make you incapable of sustaining the efforts sometimes demanded when participating in recreational diving?

answer

Inadequate sleep. A recent head cold. Recent ingestion of drugs (medicine, alcohol, narcotics).

question

Which action is recommended if the power inflation mechanism on your BCD "sticks" or "freezes" in the open position during a dive?

answer

Immediately disconnect the inflator hose and vent air from the BCD as needed to maintain proper buoyancy.

question

A diver experiencing panic should:

answer

Stop, rest and breathe slowly and deeply until you recover.

question

Which is the most effective way to descend while maintaining orientation and attempting equalization of the ears?

answer

Feet first.

question

Continued loss of body heat in cold water will produce:

answer

Muscle cramps. Progressive immobility. Insensitivity to pain.

question

Physical fitness is an important consideration for scuba divers because it helps to prevent diving accidents due to:

answer

Exhaustion

question

When conducting a buoyancy check, neutral buoyancy or proper weighting is attained when, with a normal breath, you float at or near:

answer

eye level

question

_____ is a worldwide emergency network of hyperbaric chambers and diving physicians.

answer

DAN

question

When making an Emergency Ascent, a scuba diver should:

answer

Exhale continuously during the ascent, periodically attempting to inhale.

question

It is recommended that a dive team diving from an anchored boat begin their dive:

answer

Against the prevailing current.

question

If during a dive you and your buddy become separated, you should:

answer

Spend no more than one minute looking and then surface.

question

To relieve a cramp in the calf:

answer

Bend the toe of the fin toward the knee to stretch the muscle.

question

A diver on the surface waving his/her hand overhead and thrashing violently indicates:

answer

Distress

question

Immediately upon reaching the dive site, you should:

answer

Observe conditions.

question

Completing this entry-level scuba certification course makes you knowledgeable and skillful enough to dive safely in or at:

answer

Open water with conditions similar to those in which you were trained.

question

If you receive your entry level training in the surf off California and then move to Boston, the best way of becoming familiar with the diving procedures specific to Boston and the east coast area is to:

answer

Contact an active, preferably NAUI, instructor in Boston and dive with him or her.

question

According to NAUI, which of the following is essential to consider when planning a safe dive?

answer

One team member acts as the leader, agreement on the activity/objective, set the course to be followed, discuss contingency plans and emergency procedures.

question

Which of the following is a typical cause of entanglement underwater?

answer

Fishing line.

question

If it is suspected that the air in a tank is contaminated due to its smell or taste:

answer

Do not use the tank and immediately call the dive shop that filled the tank so they can investigate the problem.

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