Question 2 of 21

Most fins for scuba diving are open-heeled, but full-footed fins exist, primarily for __________.

... Full fins are sometimes used in tropical waters, where the "booties" used for cold-water diving are not needed.

Question 3 of 21

Wet suits are appropriate for diving in water between __________ degrees.

... Neoprene wet suits trap water between the suit and skin, which provides insulation when your body warms the water. They function well in a wide range of water temperature: 50 to 90 degrees Fahrenheit (10 and 32 Celsius).

Question 4 of 21

Diving masks cover the eyes and nose _________.

... Ordinary swim goggles that just shield the eyes shouldn't be worn when scuba diving. The sinuses need protection as the pressure changes during descent and ascent.

Question 5 of 21

A snorkel is used close to the water surface; it should extend from the mouth to _________.

... A snorkel attaches to the mask to stay out of the way until needed. It should extend from the mouth to the crown of the head.

Question 6 of 21

Instead of wet suits, body suits are often worn in tropical water; they protect against _________.

... Body suits provide some protection against several hazards of tropical environments: intense sun, poisonous creatures and rough terrain.

Question 7 of 21

A regulator provides air to the diver ________.

... The regulator supplies air when the diver inhales and propels the breath into the water during exhalation.

Question 8 of 21

A dive computer is essential for monitoring the depth you dive in order to regulate the _______ in your body.

... The increased pressure experienced during scuba diving causes nitrogen from your breathing air to dissolve in your body's tissues. The speed of this dissolution increases as you dive deeper. Too much nitrogen can cause a serious disorder, decompression sickness (a.k.a., "the bends"). The dive computer, then, gives you an accurate reading of the water depth so you can avoid descending to a dangerous level.

Question 9 of 21

Weights (e.g., weight belts) are used in diving to _________.

... People are naturally buoyant, and wet suits and dry suits enhance their ability to float. So weights let you swim down without dragging you down.

Question 10 of 21

Scuba tanks must be inspected __________.

... Divers must take their tanks to a certified inspection shop each year. If the tank is safe, it is labeled with a decal. On the flipside, dive shops cannot legally refill the air in a tank that does not display this decal.

Question 11 of 21

A dive knife is NOT used as a/an ________.

... A knife is not intended as a weapon. But it is essential safety equipment, in case the diver becomes entangled in something. When simply exploring underwater, it also can be a general tool, and it can be used as a communications device when tapping it on the tank to get a dive partner's attention.

Question 12 of 21

A BCD controls your ________.

... The Buoyancy Control Device (BCD) consists of a bladder to which you can add or release air. This gives you greater control over your buoyancy. It's part of the unit that secures the tank to your back.

Question 13 of 21

A dive flag is primarily used to _________.

... Divers tow a flag attached to a float or, if they use a boat as home base, fasten the flag to the boat. Boaters are required to stay a safe distance away from the dive flag.

Question 14 of 21

"Mask squeeze" (injury to soft facial tissue) can be prevented by _________.

... Nasal exhalation during descent can equalize pressure between the air trapped in the mask and pressure within facial blood vessels. Masks must also fit properly to avoid mask squeeze.

Question 15 of 21

Divers should carry __________.

... PADI, the Professional Association of Diving Instructors, recommends that a diver carry a minimum of one auditory (e.g., air horn, marine whistle) and one visual (e.g., strobe, mirror) signaling device.

Question 16 of 21

The most important consideration for a scuba gear bag is its __________.

... Fabric for dive bags must be heavy and not prone to decomposing from excessive contact with water.

Question 17 of 21

Which of the following is a requirement for a dive camera?

... Moisture-resistant cameras are not sufficient; to protect from wetness and pressure, a dive camera must have an underwater housing.

Question 18 of 21

The recommended dive limit for recreational divers is ________.

... A depth of 130 feet (40 meters) is considered a safe recreational limit. Some divers go further down, but below that depth, problems are more likely to show up and they tend to be very serious ones.

Question 19 of 21

Holding your breath while ascending can cause problems with your __________.

... When taking classes in scuba diving, prospective divers are taught never to hold their breath while going up. Doing so disrupts your body's ability to respond to changes in pressure and can lead to an embolism (blot clot) in the lungs or pneumothorax (tearing of the lungs).

Question 20 of 21

"Tec" (technical) diving involves going deeper than traditionally recommended. In order to do this, the mixture of gas is different: there is more _________.

... "Nitrox" (64-68 percent nitrogen, 32-36 percent oxygen) is used during tec diving instead of compressed air (21 percent oxygen, 79 percent nitrogen). The increase in oxygen reduces the possibility of decompression sickness, though it also increases the potential for oxygen toxicity, which can cause seizures.

Question 21 of 21

Dry suits usually keep all of the body dry except for the _________.

... A dry suit covers a diver from neck to toes, providing excellent protection from the wet and cold. Often, the head and hands are covered by a wet suit hood and gloves.

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