SDI (Scuba Diving International) Part 2 Questions and Answers New (2024/2025) Solved 100% Correct

What medical problem can occur if a diver ascends much too rapidly for nitrogen to be slowly released? - ️️It can come out of solution into your blood making bubbles which collect at your joints causing the bends or decompression sickness. What will be the volume in a ball that is filled with two cubic feet of air at 99 feet when it's taken to the surface? - ️️8 cubic feet If a scuba cylinder lasts 2 hours at sea level, how long will it last at 20 meters (66 feet)? - ️️40 minutes How often should a scuba diver equalize during a descent? - ️️at the surface and every couple of feet as you descend. What should you do if you experience discomfort in your ears upon descending? - ️️Stop and ascend a few feet until you no longer feel any discomfort. Try to equalize again and continue with your descent. What is a reverse block? - ️️When air cannot escape from a air space during ascent What should you do if you experience a reverse block upon ascending? - ️️Descend a couple of feet until the pain subsides, wait a minute, and continue your ascent. What is the absolute pressure (in atmospheres/bars, ATM) at 20 meters(66 feet) - ️️2 ATM What is the most important rule in scuba diving? - ️️keep breathing and never hold your breath What is the most serious injury that a diver could suffer from if they hold their breath upon ascending? - ️️lung over-expansion injury or ruptured lung Which gas component in air causes decompression sickness and narcosis? - ️️nitrogenList at least 5 factors that can predispose a diver to decompression sickness. - ️️obesity, age, illness, injuries, repetitive dives, dehydration, fatigue, use of drugs or alcohol How many more times dense is the air in a balloon at 4 ATM/bar compared to the air density at the surface? - ️️4x (4 times) Describe the sym What should you do if you suddenly feel sick and develop a headache during a scuba dive? - ️️Immediately abort the dive by making a controlled ascent to the surface. What may indicate that the air in a scuba cylinder is harmful to consume? - ️️the smell or taste, do not use air that has an odor or taste What is the depth threshold where most scuba divers generally begin to be affected by nitrogen narcosis. - ️️30 meters or 100 feet and greater List two possible ways a diver may feel if they become "narked" at depth. "rapture of the deep" - ️️extreme anxiety an euphoria What should a diver do to alleviate the symptoms of nitrogen narcosis? - ️️Ascend normally until you no longer feel the effects. Which gas causes extreme headache and nausea, and in high enough concentrations causes unconsciousness and the lips and fingernail beds to turn bright red? - ️️Carbon monoxide ptoms of DCS, including mild to severe signs and symptoms. - ️️Joint pain is the most common symptom, a rash or crackling skin may appear if bubbles occur in the capillaries near the skin, difficulty breathing, dry cough, dizziness, numbness, tingling, paralysis, temporary blindness, unconsciousness, permanent disability or death.