Laurie's Excellent Scuba Certification Quiz #1
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Which two materials are scuba tanks made from?
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Steel or lead
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Aluminum or steel
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Aluminum or hard plastic
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Steel or neoprene
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These questions are from the information given to me by my scuba instructor. I wrote this test to help me study for the final scuba exam. The information is for a recreational intro course.
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- 2.
If you feel discomfort or pain when descending you can ascend a few feet to make equalization easier.
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True
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False
Correct Answer
A. TrueExplanation
If a person experiences discomfort or pain while descending, ascending a few feet can help make equalization easier. Equalization refers to the process of balancing the pressure between the middle ear and the surrounding environment, which is important for divers or individuals in high-pressure environments. By ascending a few feet, the pressure on the ears decreases, allowing for easier equalization and potentially relieving discomfort or pain. Therefore, the statement is true.Rate this question:
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- 3.
When a diver displaces water equal to their own weight he/she is neutrally buoyant.
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True
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False
Correct Answer
A. TrueExplanation
When a diver displaces water equal to their own weight, it means that the upward force exerted by the water is equal to the downward force exerted by the diver's weight. This results in a balanced condition where the diver neither sinks nor floats, known as neutral buoyancy. Therefore, the statement is true.Rate this question:
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- 4.
What does the hand signal when you "slit your throat" mean?
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I am out of air.
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I must rest.
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I am going to kill you.
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I am low on air.
Correct Answer
A. I am out of air.Explanation
The hand signal of "slitting your throat" typically signifies that the person is out of air. This gesture is commonly used in situations where verbal communication is difficult or impossible, such as underwater or in loud environments. By making this hand signal, the person is indicating that they are running out of breath and need to surface or get more air.Rate this question:
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- 5.
The dive knife is used primarliy:
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As a tool.
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To show off.
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As a substitute when you do not have a spear gun.
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As a weapon for underwater self-defense.
Correct Answer
A. As a tool.Explanation
The correct answer is "as a tool." A dive knife is primarily used as a tool for various purposes while diving, such as cutting through tangled ropes, lines, or fishing nets, prying open shells, or signaling underwater. While it can be used for self-defense in rare situations, its main function is to assist divers in practical tasks rather than as a weapon or for showing off.Rate this question:
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- 6.
An ear squeeze can be prevented by:
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Descending faster.
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Holding your breath.
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Breathing slowly.
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Valsalva- pinch your nose, tilt head back to stretch Eustachian Tube and breath slowly. Clear every 2 feet to equalize.
Correct Answer
A. Valsalva- pinch your nose, tilt head back to stretch Eustachian Tube and breath slowly. Clear every 2 feet to equalize.Explanation
Descending faster can actually increase the risk of ear squeeze, as the pressure changes in the ear can occur more rapidly. Holding your breath can also worsen the situation, as it can cause the pressure in the middle ear to build up. Breathing slowly and using the Valsalva maneuver (pinching the nose, tilting the head back, and breathing slowly) is a recommended technique to prevent ear squeeze. This maneuver helps to equalize the pressure in the middle ear by opening the Eustachian tube and allowing air to flow. Clearing every 2 feet while descending helps to maintain equalization throughout the descent.Rate this question:
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- 7.
What is a "drift dive"?
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When a diver is floating at the surface during a dive.
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When a diver performs multiple dives in one day.
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When a diver is dragged behind a boat by a rope.
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When a diver allows a current to carry him along.
Correct Answer
A. When a diver allows a current to carry him along.Explanation
A "drift dive" refers to a diving technique where a diver intentionally allows a current to carry them along. This can be done by descending into the water at a specific location and then allowing the current to carry the diver along a planned route. Drift diving can offer an exciting and effortless way to explore underwater environments, as the diver is carried along by the current and can observe marine life and underwater scenery without exerting much effort in swimming against the current.Rate this question:
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- 8.
What does RNT stand for on a dive table?
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Reversed Nautical Table
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Reverse Natuical Tides
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Residual Nitrogen Time
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Responsible Navy Trainer
Correct Answer
A. Residual Nitrogen TimeExplanation
RNT stands for Residual Nitrogen Time. This refers to the amount of time a diver must wait before ascending to the surface to allow their body to eliminate excess nitrogen absorbed during the dive. This is an important factor in dive planning to prevent decompression sickness.Rate this question:
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- 9.
A diver is more buoyant in the sea than in a lake.
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True
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False
Correct Answer
A. TrueExplanation
The density of saltwater in the sea is higher than that of freshwater in a lake. This higher density of saltwater creates more buoyant force, allowing the diver to float more easily in the sea compared to a lake. Therefore, the statement is true.Rate this question:
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- 10.
What percent of air is oxygen?
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21%
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79%
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47%
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56%
Correct Answer
A. 21%Explanation
The correct answer is 21% because oxygen makes up approximately 21% of the Earth's atmosphere. This is an important fact as oxygen is essential for the survival of many living organisms, including humans.Rate this question:
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- 11.
The symptoms of nitrogen narcosis are said to be similar to:
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Alcohol intoxication
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A severe headache
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Fainting
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An out of body experience
Correct Answer
A. Alcohol intoxicationExplanation
Nitrogen narcosis is a condition that occurs when a person dives to great depths underwater and experiences an altered state of consciousness due to the increased pressure of nitrogen in their body. The symptoms of nitrogen narcosis, such as impaired judgment, euphoria, and loss of coordination, are similar to those of alcohol intoxication. Both conditions can cause confusion, impaired motor skills, and a feeling of being "out of it." This similarity in symptoms is due to the fact that both alcohol and nitrogen affect the central nervous system, leading to similar impairments in cognitive and physical functioning.Rate this question:
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- 12.
When you practice neutral bouyancy, inhalations will cause you to __ and exhaling will cause you to __.
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Ingas, outgas
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Roll, wiggle
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Rise, fall
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Implode, explode
Correct Answer
A. Rise, fallExplanation
When practicing neutral buoyancy, inhalations will cause you to rise and exhaling will cause you to fall. This is because when you inhale, you fill your lungs with air, which increases your overall volume and decreases your density. As a result, you become less dense than the surrounding water and experience a buoyant force that pushes you upwards. On the other hand, when you exhale, you release air from your lungs, reducing your volume and increasing your density. This causes you to become denser than the surrounding water and you will sink or fall.Rate this question:
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- 13.
A thermocline ___.
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Is an abrupt change in water pressure.
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Is a gradual change of water temperature.
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Is an abrupt change of water temperature.
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Is an abrupt change of the underwater visibility.
Correct Answer
A. Is an abrupt change of water temperature.Explanation
A thermocline refers to an abrupt change in water temperature. This phenomenon occurs when there is a rapid change in temperature with depth in a body of water. The thermocline acts as a barrier, separating warmer surface water from colder deep water. This temperature gradient can have significant effects on the distribution of marine life and can impact various oceanic processes such as nutrient cycling and oceanic currents.Rate this question:
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- 14.
How often should you equalize your body air spaces during a descent to 50 feet?
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Once every 5 feet
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Every few feet, before you feel any discomfort
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Only when the pain is disturbing you
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When you feel discomfort
Correct Answer
A. Every few feet, before you feel any discomfortExplanation
During a descent to 50 feet, equalizing your body air spaces every few feet, before you feel any discomfort, is important. This is because as you descend, the pressure increases, which can cause discomfort and pain in your ears and sinuses. By equalizing your body air spaces regularly, you can prevent this discomfort and potential damage to your ears. Waiting until you feel discomfort or pain may indicate that the pressure has already built up too much, making it more difficult to equalize and potentially causing injury. Therefore, it is best to equalize every few feet to prevent any discomfort from occurring.Rate this question:
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- 15.
What is the most important feature of a weight system?
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That the weights are made of stainless steel.
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That it is easy to fasten and remove when you are on land.
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That it is easy to adjust.
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That it has a quick release mechanism.
Correct Answer
A. That it has a quick release mechanism.Explanation
The most important feature of a weight system is that it has a quick release mechanism. This allows the diver to easily and quickly remove the weights in case of an emergency or if they need to adjust their buoyancy. It ensures the safety and comfort of the diver by providing a convenient and efficient way to release the weights when needed.Rate this question:
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- 16.
Which of the following statements is correct?
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Neoprene is negatively buoyant.
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Dive tables are not recommended to bring if you have a dive computer.
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You should always dive with a dive partner.
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Air is mostly made up of oxygen.
Correct Answer
A. You should always dive with a dive partner.Explanation
Diving with a dive partner is essential for safety reasons. Having a dive partner ensures that there is someone to assist in case of emergencies, to share equipment, and to provide support and communication underwater. It is considered a fundamental rule in diving to always have a buddy system in place.Rate this question:
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- 17.
What does BCD stand for?
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Borderline Compression Diagram
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Buoyancy Compensation Device
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Breathing Capacity Device
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Breathing Control Device
Correct Answer
A. Buoyancy Compensation DeviceExplanation
BCD stands for Buoyancy Compensation Device. A Buoyancy Compensation Device is a piece of scuba diving equipment that allows divers to control their buoyancy underwater. It consists of an inflatable bladder that can be filled with air or released to adjust the diver's buoyancy. By adding air to the BCD, the diver becomes more buoyant and can ascend, while releasing air from the BCD makes the diver less buoyant and allows them to descend. This device is essential for maintaining neutral buoyancy and controlling depth during a dive.Rate this question:
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- 18.
The large majority of surface waves are caused by:
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Wind
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Underwater earthquakes
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Boats and ships
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Underwater volcanoes
Correct Answer
A. WindExplanation
Surface waves are primarily caused by wind. When wind blows across the surface of a body of water, it creates friction and transfers energy to the water, causing it to move in a circular motion. These circular motions form waves that propagate across the surface. While underwater earthquakes, boats and ships, and underwater volcanoes can also cause surface waves, they are relatively less common compared to the influence of wind. Therefore, wind is the most likely cause of the large majority of surface waves.Rate this question:
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- 19.
What is the main purpose of the "divers down" flag?
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To indicate a place or area offering diving related services.
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To notify people on a beach that there are dangerous currents in the water close to the shore.
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To notify any boats in the area that there are divers in the water.
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To notify divers that there might be sharks in the area.
Correct Answer
A. To notify any boats in the area that there are divers in the water.Explanation
The "divers down" flag is used to notify any boats in the area that there are divers in the water. This flag is displayed on a vessel or a buoy to indicate that there are divers below and that boats should proceed with caution. It is an important safety measure to prevent accidents and ensure the safety of the divers.Rate this question:
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- 20.
What action is NOT likely to cause decompression sickness?
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Descending too quickly.
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Skipping the decompression stops after a long, deep dive.
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Flying on the same day as diving.
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Ascending too quickly.
Correct Answer
A. Descending too quickly.Explanation
Descending too quickly is not likely to cause decompression sickness because decompression sickness, also known as "the bends," occurs when dissolved gases (usually nitrogen) come out of solution and form bubbles in the body during or after a decrease in pressure. Descending too quickly does not allow enough time for the gases to come out of solution and form bubbles, reducing the risk of decompression sickness.Rate this question:
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- 21.
What is "the bends?"
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It is a nickname for a strong underwater current.
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It is a common name for decompression sickness.
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It is a hand signal that means that you have half of your air left.
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It is a hose connecting the BCD to the tank.
Correct Answer
A. It is a common name for decompression sickness.Explanation
The term "the bends" is a common name for decompression sickness. Decompression sickness occurs when a diver ascends too quickly from a deep dive, causing nitrogen bubbles to form in the bloodstream. This can lead to various symptoms, including joint and muscle pain, dizziness, and difficulty breathing. The nickname "the bends" comes from the fact that the symptoms often include severe joint pain, which can cause the affected person to bend over in pain.Rate this question:
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- 22.
What is nitrogen narcosis caused by?
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A psychological defense mechanism.
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Increased levels of dissolved nitrogen in the blood.
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Breathing compressed air for too long.
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Lack of oxygen to the brain.
Correct Answer
A. Increased levels of dissolved nitrogen in the blood.Explanation
Nitrogen narcosis is caused by increased levels of dissolved nitrogen in the blood. When a diver descends to great depths, the pressure causes nitrogen to dissolve into the bloodstream. This excess nitrogen can have a narcotic effect on the brain, leading to symptoms such as confusion, impaired judgment, and loss of coordination. It is not caused by a psychological defense mechanism, breathing compressed air for too long, or lack of oxygen to the brain.Rate this question:
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- 23.
What can happen if you leave a full scuba tank in the truck of a car that is parked in the sun on a hot day?
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Nothing
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The o-ring can melt
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The tank can burst
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All the air can slowly leak out
Correct Answer
A. The tank can burstExplanation
Leaving a full scuba tank in the trunk of a car parked in the sun on a hot day can cause the tank to burst. This is because the heat can cause the air inside the tank to expand, creating excessive pressure. If the pressure becomes too high, it can exceed the tank's capacity and cause it to burst, potentially leading to a dangerous situation.Rate this question:
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- 24.
What causes tides?
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Deep ocean currents.
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Waves.
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The gravitational attraction of the moon and the sun on the waters on earth.
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None of the above
Correct Answer
A. The gravitational attraction of the moon and the sun on the waters on earth.Explanation
Tides are caused by the gravitational attraction of the moon and the sun on the waters on earth. The moon's gravity pulls the water towards it, causing a bulge on the side of the earth facing the moon and a corresponding bulge on the opposite side. This creates high tides. The sun's gravity also contributes to the tidal forces, although to a lesser extent. As the earth rotates, different parts of the planet experience these bulges, resulting in the rise and fall of the tides. Deep ocean currents and waves do not directly cause tides.Rate this question:
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- 25.
A mask squeeze is caused when the out-side pressure is lower than the pressure in the air space in the mask.
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True
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False
Correct Answer
A. FalseExplanation
A mask squeeze is caused when the outside pressure is higher than the pressure in the air space in the mask. This can happen when a diver descends to greater depths where the water pressure increases. As the pressure inside the mask remains the same, the higher external pressure causes the mask to squeeze against the diver's face, potentially causing discomfort or injury. Therefore, the correct answer is False.Rate this question:
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- 26.
Due to light refraction, objects underwater appear:
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Smaller and further away
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Smaller and closer
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Larger and closer
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Larger and further away
Correct Answer
A. Larger and closerExplanation
When light passes from one medium to another, such as from air to water, it changes speed and direction, causing refraction. This refraction causes objects underwater to appear larger because the light rays bend towards the normal, making the object seem magnified. Additionally, the refraction also makes the objects appear closer because the light rays bend away from the normal as they enter our eyes, giving the illusion that the object is nearer than it actually is.Rate this question:
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- 27.
What is mask squeeze?
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When the outside water pressure presses the mask against your face.
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When you are unable to equalize because of blocked nostrils.
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When the mask strap is too short.
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When the mask strap is untightened and the mask glides off.
Correct Answer
A. When the outside water pressure presses the mask against your face.Explanation
Mask squeeze refers to the condition when the outside water pressure presses the mask tightly against your face. This can cause discomfort and potential injury to the diver's face and eyes. The pressure exerted by the water can be quite strong, especially at deeper depths, and can result in pain, bruising, and even broken blood vessels. It is important to properly equalize the pressure inside the mask by exhaling through the nose, ensuring a comfortable and safe diving experience.Rate this question:
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- 28.
What is the best course of action when you are out of air and your diving partner (buddy) is close-by?
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Signal to your diving partner that you will ascend, fill your tank and then come down again.
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Jerk your partners regulator so that he/she will share his/hers.
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Switch to your dive partner's alternate air source.
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Signal your partner to ascend to the surface.
Correct Answer
A. Switch to your dive partner's alternate air source.Explanation
Switching to your dive partner's alternate air source is the best course of action when you are out of air and your diving partner is close-by. This allows you to continue breathing while you ascend to the surface together, ensuring both of your safety. Signaling to ascend, filling your tank, and coming down again may take too much time and could potentially lead to a dangerous situation. Jerking your partner's regulator may cause panic and is not a recommended or safe approach.Rate this question:
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- 29.
Which of the following can happen if you hold your breath while scuba diving?
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You can injure your lungs.
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You can sustain life threatening injuries.
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Air can get released into your blood stream.
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All of the above
Correct Answer
A. All of the aboveExplanation
If you hold your breath while scuba diving, several things can happen. Firstly, you can injure your lungs because the pressure underwater can cause damage if air is trapped inside. Secondly, you can sustain life-threatening injuries because the pressure can cause air to expand and damage your organs. Lastly, air can get released into your bloodstream, which can lead to serious complications like embolism. Therefore, all of the above options are possible consequences of holding your breath while scuba diving.Rate this question:
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- 30.
What is a recommended care strategy for scuba tanks?
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Always store the tank in a warm space.
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Keep the tank valve moist at all times.
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Always leave some pressurized air in the tank.
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Never fill the tank with other gases than oxygen.
Correct Answer
A. Always leave some pressurized air in the tank.Explanation
It is recommended to always leave some pressurized air in the scuba tank. This is because an empty tank can lead to moisture buildup which can cause corrosion and damage to the tank. Additionally, leaving some pressurized air in the tank helps to prevent contaminants from entering and causing damage.Rate this question:
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- 31.
At what depth will you reach 2 ATM of pressure?
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At sea level
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33 feet
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66 feet
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99 feet
Correct Answer
A. 33 feetExplanation
At sea level, the atmospheric pressure is 1 ATM. As you go deeper into water, the pressure increases by 1 ATM for every 33 feet. Therefore, at a depth of 33 feet, the pressure would be 2 ATM.Rate this question:
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- 32.
What is the average full pressure of a recreational scuba tank?
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6000 psi
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7500 psi
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3000 psi
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1000 psi
Correct Answer
A. 3000 psiExplanation
The average full pressure of a recreational scuba tank is typically around 3000 psi. This pressure is sufficient for most recreational diving activities and allows divers to stay underwater for a reasonable amount of time. Higher pressures, such as 6000 psi or 7500 psi, are more commonly found in technical diving setups or for specific diving purposes, while 1000 psi would be considered dangerously low and would require immediate attention.Rate this question:
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- 33.
What is the common term for the time a diver spends at the surface to allow excess nitrogen to off gas from their blood and tissues?
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Surface time
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Surface interval
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Dive interval
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Depressurization
Correct Answer
A. Surface intervalExplanation
The common term for the time a diver spends at the surface to allow excess nitrogen to off gas from their blood and tissues is known as the "surface interval". This period is crucial for divers to ensure that they have enough time to eliminate the excess nitrogen absorbed during the dive, reducing the risk of decompression sickness.Rate this question:
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- 34.
A dive team caught in a rip current taking them in a direction they do not want to go, should:
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Descend immediately
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Swim at a right angle to the current
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Swim against the current
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Swim with the current
Correct Answer
A. Swim at a right angle to the currentExplanation
When caught in a rip current, it is important to swim at a right angle to the current. This is because rip currents are powerful narrow channels of water that flow away from the shore. Swimming against the current can be exhausting and ineffective, as the current is usually too strong to overcome. Swimming with the current will only take the dive team further in the unwanted direction. By swimming at a right angle to the current, the team can escape the rip current and reach a safer area.Rate this question:
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- 35.
On ascent, remember to release expanding air in your BC to prevent:
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Rapid ascent
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Squeeze
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Nitrogen narcosis
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An explosion
Correct Answer
A. Rapid ascentExplanation
During ascent, releasing expanding air in your BC (buoyancy compensator) is important to prevent a rapid ascent. If the air is not released, it can cause the diver to ascend too quickly, which can lead to various complications such as decompression sickness or lung overexpansion injuries. Releasing the expanding air helps to maintain a controlled ascent rate and ensures the diver's safety.Rate this question:
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- 36.
What is likely to be affected by the type and amount of suspended particles in the water?
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The visibility.
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The dive computer.
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Your buoyancy.
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The water temperature.
Correct Answer
A. The visibility.Explanation
The type and amount of suspended particles in the water can have a direct impact on the visibility. When there are more particles in the water, such as sediment or algae, it can reduce the clarity of the water, making it more difficult to see clearly underwater. This can affect activities like diving or snorkeling, as it may be harder to navigate or observe marine life. The dive computer, buoyancy, and water temperature are not directly affected by the suspended particles in the water.Rate this question:
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- 37.
What are the two basic parts of a regulator called?
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The first and second stage
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The hose and mouthpiece
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The first stage and the dust cap
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The valve and mouthpiece
Correct Answer
A. The first and second stageExplanation
The two basic parts of a regulator are the first stage and the second stage. The first stage is responsible for reducing the high pressure from the tank to an intermediate pressure, while the second stage delivers the air to the diver at a breathable pressure.Rate this question:
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- 38.
What may be the cause if you are not able to equalize your body's air spaces while ascending or descending?
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A cold or an allergy.
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Exhaustion.
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A tight wetsuit.
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High blood pressure.
Correct Answer
A. A cold or an allergy.Explanation
If you are not able to equalize your body's air spaces while ascending or descending, a possible cause could be a cold or an allergy. Both a cold and an allergy can cause congestion and inflammation in the nasal passages and Eustachian tubes, making it difficult for air to flow in and out of the middle ear. This can lead to a feeling of pressure or discomfort in the ears and can make it challenging to equalize the air spaces while changing altitude.Rate this question:
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- 39.
If your regulator begins to "free flow" (release alot of air) while underwater you should:
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Ascend as you hold the regulator to your mouth without sealing your mouth around the mouth piece.
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Drop your weight sytem and ascend to the surface.
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Share air with your diving partner.
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Continue the dive until you run out of air and have to ascend.
Correct Answer
A. Ascend as you hold the regulator to your mouth without sealing your mouth around the mouth piece.Explanation
If the regulator begins to "free flow" (release a lot of air) while underwater, it means that there is a malfunction in the regulator. Ascending while holding the regulator to your mouth without sealing your mouth around the mouthpiece allows you to continue breathing from the regulator, even though it is free flowing. This ensures that you have a continuous supply of air while safely ascending to the surface. Dropping your weight system and ascending to the surface may not be necessary if you can still breathe from the regulator. Sharing air with your diving partner is not necessary in this situation as long as you can breathe from your own regulator. Continuing the dive until you run out of air and have to ascend is not a safe option when there is a malfunction with the regulator.Rate this question:
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- 40.
What does SCUBA stand for?
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Self Controlled Underwater Breathing Apparatus
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Self Compressed Underwater Breathing Apparatus
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Self Contained Underwater Breathing Apparatus
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Self Controlled Underwater Boyancy Apparatus
Correct Answer
A. Self Contained Underwater Breathing ApparatusExplanation
SCUBA stands for Self Contained Underwater Breathing Apparatus. This term refers to a diving equipment that allows divers to breathe underwater without being connected to the surface. The apparatus contains a tank of compressed air that the diver can breathe through a regulator. The correct answer option accurately describes the purpose and function of SCUBA equipment.Rate this question:
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- 41.
Where are you exposed to 1 ATM (atmosphere) of pressure?
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33 feet
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66 feet
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99 feet
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At sea level
Correct Answer
A. At sea levelExplanation
At sea level, you are exposed to 1 ATM (atmosphere) of pressure. This is because at sea level, the weight of the air above you exerts a pressure of approximately 1 atmosphere. As you go deeper underwater, the pressure increases, so at 33, 66, or 99 feet, the pressure would be greater than 1 ATM.Rate this question:
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- 42.
What happens with the underwater pressure every 33 feet while descending?
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It increases with one atmosphere (atm).
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It triples.
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It doubles.
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It increases 50%.
Correct Answer
A. It increases with one atmosphere (atm).Explanation
As one descends underwater, the pressure increases due to the weight of the water above. The pressure increases by one atmosphere (atm) for every 33 feet of descent. This is because the weight of the water column above adds an additional atmospheric pressure to the diver. Therefore, the correct answer is that the underwater pressure increases with one atmosphere (atm) every 33 feet while descending.Rate this question:
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- 43.
First aid treatment for a person suffering from decompression illness always includes 100% inhaled oxygen.
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True
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False
Correct Answer
A. TrueExplanation
Decompression illness, also known as "the bends," occurs when a person ascends too quickly from a deep dive or high-pressure environment. This condition can cause nitrogen bubbles to form in the bloodstream, leading to various symptoms such as joint pain, dizziness, and difficulty breathing. Administering 100% inhaled oxygen is a crucial first aid treatment for decompression illness. Oxygen helps to remove nitrogen from the body more efficiently, reducing the size of the bubbles and alleviating symptoms. Therefore, the statement is true.Rate this question:
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- 44.
Most dive injuries caused by aquatic organisms result from a/an __ response from the organism.
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Defensive
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Offensive
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Unintentional
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Reflexive
Correct Answer
A. DefensiveExplanation
Aquatic organisms can cause injuries during diving due to their defensive response. When they perceive a threat or feel endangered, they may react by attacking or defending themselves. This defensive behavior can result in injuries to the diver. Offensive, unintentional, and reflexive responses are not as likely to cause injuries in this context.Rate this question:
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- 45.
Nitrogen narcosis is most common at:
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33 feet
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Depths lower than 33 feet
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60 feet
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Depths approaching 99 feet and deeper
Correct Answer
A. Depths approaching 99 feet and deeperExplanation
Nitrogen narcosis, also known as "raptures of the deep," is a condition that can occur when a diver descends to great depths. The increased pressure at these depths causes nitrogen to dissolve in the body's tissues, leading to symptoms similar to alcohol intoxication. While nitrogen narcosis can occur at various depths, it becomes most common and pronounced as the diver approaches 99 feet and deeper. At these depths, the effects of nitrogen narcosis can be severe and potentially dangerous, impairing judgment, coordination, and decision-making abilities. Therefore, depths approaching 99 feet and deeper are where nitrogen narcosis is most likely to occur.Rate this question:
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- 46.
What will happen to your wetsuit as you descend?
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It will expand and feel looser against your body.
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It will get warmer and warmer.
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It will compress and decrease your buoyancy.
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It will expand and increase your buoyancy.
Correct Answer
A. It will compress and decrease your buoyancy.Explanation
As you descend underwater, the pressure increases. This increased pressure causes the air trapped inside the wetsuit to compress, making the wetsuit tighter against your body. This compression also leads to a decrease in buoyancy, making it harder for you to float or stay at the surface of the water.Rate this question:
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- 47.
The air in your scuba tank is comprised of ___ oxygen and __ nitrogen.
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21%, 79%
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40%, 60%
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79%, 21%
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Pure, no
Correct Answer
A. 21%, 79%Explanation
The air in a scuba tank is mainly composed of 21% oxygen and 79% nitrogen. This mixture is carefully balanced to provide enough oxygen for breathing while minimizing the risk of oxygen toxicity. The high nitrogen content is necessary to prevent nitrogen narcosis, a condition that can occur at depth due to the increased pressure. Therefore, the correct answer is 21% oxygen and 79% nitrogen.Rate this question:
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- 48.
What should you do if a series of dives are planned for one day?
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Make sure to breathe pure oxygen between your dives.
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Rest for several hours in between dives.
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Complete the deepest dive first.
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Complete the shallowest dive first.
Correct Answer
A. Complete the deepest dive first.Explanation
When planning a series of dives for one day, it is recommended to complete the deepest dive first. This is because the deeper dives can have a greater impact on the body and can cause nitrogen build-up in the tissues, which increases the risk of decompression sickness. By completing the deepest dive first, the body will have less nitrogen build-up, and subsequent shallower dives will have a lower risk. Resting for several hours in between dives and breathing pure oxygen are also important safety measures, but completing the deepest dive first is the most crucial step to minimize the risk of decompression sickness.Rate this question:
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- 49.
What increases when the volume of a gas decrease according to Boyle's Law?
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Explosiveness
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Temperature
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Density
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Pressure
Correct Answer
A. PressureExplanation
According to Boyle's Law, when the volume of a gas decreases, the pressure increases. This is because as the volume decreases, the gas molecules are forced to occupy a smaller space, leading to more frequent collisions with the container walls, resulting in an increase in pressure. Therefore, pressure increases when the volume of a gas decreases.Rate this question:
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Mar 17, 2023Quiz Edited by
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Jul 19, 2013Quiz Created by
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