What is the primary purpose of the life vest on board a flight?

• A. Oxygen mask supplies breathable oxygen during depressurization
• B. Emergency lighting
• C. Provide buoyancy in water
• D. Seat cushion used for comfort

Answer: (C)

The main idea being tested is the purpose of a life vest in water survival. A life vest is designed to keep you afloat in water after a ditching or evacuation, making it easier to float on the surface and stay above water until rescuers arrive. It provides buoyancy so you expend less energy trying to stay afloat, which is crucial if you’re tired or unconscious. Oxygen masks, used during depressurization, supply breathable air and are a separate safety system, not a flotation device. Emergency lighting helps visibility and evacuation flow, but it doesn’t keep you buoyant. A seat cushion might offer some buoyancy in a pinch, but it isn’t engineered as the standard flotation device. So, the primary purpose is to provide buoyancy in water.