Open Water Diver Final Exam US

What is the purpose of a BCD in scuba diving?

?

To provide extra safety by storing emergency oxygen

To maintain body temperature by insulating the diver.

To control buoyancy.

To measure and display water depth.

What can you do after completing your Open Water Diver course? Select all that apply

Dive independently

Dive under the direct supervision of a certified and renewed Scuba professional.

Rent dive equipment

Go deep diving

What is the most important rule in scuba diving?

Keep breathing and never hold your breath.

Maintain buoyancy at all times.

Use sunblock

Don't touch or interfere with marine life

Place each item in the correct order for a pre-dive safety check

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What should you do if you can no longer see your buddy?

Search for one minute, then make a normal ascent to the surface and reunite there.

Surface immediately

Search for two minutes, then make a normal ascent to the surface and reunite there.

Continue with the dive and hope you catch up with your buddy

How often should you equalize when descending underwater?

Whenever you feel pain or discomfort

When you get to the bottom

At the surface

Every metre as you descend

Match the equipment item to its function

Sort elements

Controls the flow and pressure of air from the tank to the diver's mouthpiece
Controls your buoyancy underwater
Helps conserve your air supply by allowing you to breathe with your face in the water
Holds your gas supply

Regulator

BCD

Snorkel

Cylinder

What type of entry is this?

Giant stride

Surf entry

Controlled seated entry

Beach entry

What can you use to make notes underwater?

Dive slate

Pen and paper

Dive computer

Camera

Why is it essential to maintain proper buoyancy throughout a dive?

Proper buoyancy is important for conserving air supply, and it doesn't significantly affect other aspects of the dive.

The primary reason to maintain buoyancy is to prevent rising to the surface too quickly, which can be easily managed with weights.

Maintaining proper buoyancy helps to protect marine life, ensures efficient air consumption, and enhances overall safety and control underwater.

Buoyancy control is only critical in deep dives; in shallower waters, it's less important and can be managed intuitively.

What is the impact of water temperature on dive planning and equipment choice?

Water temperature doesn't significantly impact dive planning or equipment choice as modern wetsuits are designed to handle a wide range of temperatures.

In colder water, divers need thicker wetsuits or drysuits for insulation, and the dive duration might be shorter to prevent hypothermia.

Warm water requires heavier weights for buoyancy control and specialized masks to prevent fogging.

The primary consideration is the type of fins used; colder water requires stiffer fins for more efficient movement.

When should you make an emergency decompression stop?

At the end of every dive

When you exceed your no-decompression limits

If you dive deeper than 30 feet

When you dive within 5 minutes of your no-decompression limits

What is nitrogen narcosis, and what are its potential effects on divers?

Nitrogen narcosis occurs when nitrogen bubbles form in the bloodstream during rapid ascent, causing joint pain and dizziness.

Nitrogen narcosis is caused by breathing oxygen at depth, leading to increased alertness and improved reflexes.

Nitrogen narcosis is a state resulting from breathing nitrogen at high partial pressures, often characterized by euphoria, impaired judgment, and a false sense of security.

Nitrogen narcosis is the result of excessive carbon dioxide buildup in the body due to improper breathing techniques, leading to headaches and confusion.

What causes a reverse squeeze?

Expanding air can become trapped in your airspaces during your ascent

Expanding air can become trapped in your airspaces during your descent

Forgetting to equalise

Descending too quickly