PADI Divemaster Certification Practice Exam

Which of the following is NOT a common sign of gas narcosis?

1. Clarity of thought

2. Mild euphoria

3. Poor judgment

4. Deteriorated motor skills

The correct answer is: Clarity of thought

Gas narcosis, often referred to as nitrogen narcosis, occurs when divers breathe in nitrogen at increased pressures underwater, leading to alterations in mental state and physical capabilities. The condition is characterized by various symptoms that can impair a diver's cognitive functions and physical coordination. Clarity of thought is not a common sign of gas narcosis. In fact, one of the hallmark effects of this condition is a decrease in cognitive clarity, which can lead to confusion and impaired decision-making. Instead, divers may experience distorted reasoning and a diminished ability to think critically, contrary to the notion of clarity. In contrast, mild euphoria, poor judgment, and deteriorated motor skills are all typical symptoms experienced by divers suffering from narcosis. Mild euphoria can lead divers to feel overly confident, which is risky. Poor judgment refers to an inability to make sound decisions, and deteriorated motor skills can affect a diver's physical capabilities, impacting their ability to control buoyancy and execute necessary maneuvers underwater. Understanding these symptoms is crucial for safe diving practices, as recognizing them can help divers take appropriate measures, such as ascending to shallower depths to alleviate the effects of narcosis.