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Adci surface supplied mixed gas diver certification exam practice questions and correct answers

HEAL100 Health Care — exam and revision material · Other

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Health Care exam material, 34 pages. Originally published on StudyMerit.

Pages
34
Academic year
2025/2026
Language
English

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ADCI Surface Supplied Mixed Gas Diver Certification Exam Practice Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf 1. What is the primary purpose of using mixed gas instead of air for deep diving? a) To reduce oxygen toxicity only b) To reduce nitrogen narcosis only c) To reduce both nitrogen narcosis and oxygen toxicity d) To increase dive speed Rationale: Mixed gas, such as heliox or trimix, is used in deep diving to reduce the risk of both nitrogen narcosis and oxygen toxicity, which can occur when breathing air at great depths.

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2. Which gas mixture is commonly used for dives below 100 meters? a) Air b) Nitrox c) Trimix d) Helium Rationale: Trimix contains oxygen, nitrogen, and helium and is used for deep dives to mitigate both nitrogen narcosis and oxygen toxicity. 3. Oxygen toxicity becomes a major concern when the partial pressure of oxygen exceeds: a) 0.5 ATA b) 1.6 ATA c) 2.0 ATA d) 1.0 ATA Rationale: Central nervous system oxygen toxicity becomes significant when PO2 exceeds 1.6 ATA during diving. 4. Which device monitors depth and partial pressure of oxygen during a dive? a) Depth gauge b) Pressure gauge c) Oxygen analyzer d) Compass Rationale: An oxygen analyzer is used to monitor PO2 in the breathing gas to ensure safe limits are not exceeded.

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5. What is the most important factor when planning a mixed gas dive? a) Water temperature b) Gas mixture and depth profile c) Visibility d) Current speed Rationale: Proper planning of gas mixtures and depth profiles is critical to avoid oxygen toxicity, nitrogen narcosis, and decompression sickness. 6. The main reason helium is added to deep diving mixtures is: a) To increase density b) To reduce nitrogen narcosis c) To increase oxygen content d) To improve buoyancy Rationale: Helium is an inert gas with low narcotic potential, which reduces nitrogen narcosis in deep dives. 7. What is the primary hazard of rapid decompression from deep mixed gas dives? a) Nitrogen narcosis b) Oxygen toxicity c) Decompression sickness d) Hypothermia Rationale: Rapid ascent without proper decompression can cause dissolved gases to form bubbles, leading to decompression sickness.

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