SDI Open Water Scuba Diver Practice Exam

Disable ads (and more) with a membership for a one time $2.99 payment

Prepare for the SDI Open Water Scuba Diver Exam. Study comprehensively with flashcards and multiple choice questions, detailed explanations aid understanding. Gear up for your certification!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

Practice this question and more.

Why must a mask cover the nose while scuba diving?

To ensure the best possible fit
To prevent water from entering
So that you can keep the pressure inside the mask equal to the pressure outside
Both the first and second answers are correct

The correct answer is: Both the first and second answers are correct

A mask must cover the nose while scuba diving for several important reasons. Firstly, covering the nose ensures a better fit, which is crucial for maintaining a good seal. A proper fit prevents water from entering the mask, a common issue that can disrupt a diver's experience underwater. Additionally, a mask that covers the nose allows for equalization of pressure. As a diver descends, water pressure increases, and air spaces in the mask can create discomfort if not equalized. By covering the nose, divers can exhale through it to equalize the pressure between the inside of the mask and the outside environment, minimizing discomfort and preventing mask squeeze. These factors are collectively important for maintaining comfort, safety, and visibility while diving, making it essential for performance underwater.