SDI Final Exam Latest Update 2025-2026 Exam 65 Questions with 100% Verified Correct Answers Guaranteed A+
A mask must cover the nose:
1: To prevent water from entering.
2: To ensure the best possible fit.
3: So that you can keep the pressure inside the mask equal to the pressure outside.4: Both the first and second answers are correct. - CORRECT ANSWER: So that you can keep the pressure inside the mask equal to the pressure outside.
A scuba cylinder that normally lasts one hour at the surface will last _______ minutes at 20 meters/66 feet.
1: 30
2: 20
3: 15
4: 10 - CORRECT ANSWER: 20
Explanation:
A scuba cylinder that normally lasts one hour at the surface will last 20 minutes at 20 m/66 ft.
Activities that may increase the risk of decompression sickness include:
1: Alcohol use.
2: Computer use.
3: Drug use.
4: Both the first and third answers are correct. - CORRECT ANSWER: Correct Answer: Both the first and third answers are correct.
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Explanation:
Activities that may increase the risk of decompression sickness include alcohol and drug use.
Additional features common to many dive computers include all of the following except: Answer 1: The ability to display dive log data and to upload that data to a laptop or desktop computer.
Answer 2: The ability to monitor a diver's exposure to air, Nitrox and Trimix.
Answer 3: The ability to project no-decompression limits for upcoming dives.
Answer 4: Bar graphs that provide a visual representation of a diver's exposure to nitrogen and other gasses. - CORRECT ANSWER: Correct Answer: The ability to monitor a diver's exposure to air, Nitrox and Trimix.
Explanation: While most dive computers can monitor a diver's exposure to air and Nitrox, few can track exposure to Trimix (an oxygen/nitrogen/helium mixture).
Air passages such as your trachea (windpipe), which may contain air your body can't
use, are known as:
1: Brachia.
2: Bronchials.
3: Dead air spaces.
4: Restricted orifices. - CORRECT ANSWER: Correct Answer: Dead air spaces.
Explanation:
Air passages such as your trachea (windpipe), which may contain air your body can't use, are known as dead air spaces.
All of the following are true except: 2 / 3
1: You can help prevent mask squeeze by exhaling periodically into your mask during ascent.2: Regular dental care and ensuring your teeth are free of gas spaces can help prevent tooth squeeze.3: If you experience a reverse block, descend to a point where the pain subsides, then ascend slowly while wiggling your jaw and swallowing. Repeat this process as needed until you can ascend without pain or discomfort.4: The danger in taking decongestants is that they may wear off during a dive and have other possible side effects. - CORRECT ANSWER: You can help prevent mask squeeze by exhaling periodically into your mask during ascent.
Among the best ways to prevent decompression sickness (DCS):
1: Remain well within your dive computer's no-decompression limit.
2: Ascend no faster than the rate allowed by the dive computer.
3: Make a safety stop of between three and five minutes at a depth of 3-6 m/10-20 ft.4: All of the above. - CORRECT ANSWER: All of the above.
Among the easiest ways to don a heavy weight belt, at the surface or under water, is to:
1: Pass it under your feet.
2: Roll into it.
3: Back into it.
4: None of the above. - CORRECT ANSWER: Correct Answer: Roll into it.
Explanation:
Among the easiest ways to don a heavy weight belt, at the surface or under water, is to roll into it.
Among the key points in doing a flutter kick correctly:
1: Keep your knees as straight as possible.
2: Emulate the leg movements you make when pedaling a bicycle.
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