Cadet Competition Written Practice Exam

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What type of propellant is predominantly used by most rockets today?

Solid
Hybrid
Liquid
Gas

The correct answer is: Liquid

The predominant use of liquid propellant in most rockets today is largely due to its efficiency and controllability. Liquid propellants allow for precise thrust adjustments during flight, which is essential for maneuverability and achieving specific orbits. This type of propellant consists of two components: a fuel and an oxidizer, which are stored separately and mixed in the combustion chamber. Notable examples of rockets utilizing liquid propellant include the SpaceX Falcon 9 and NASA's Space Launch System. The ability to throttle and shut down the engines as needed is another significant advantage, making liquid propulsion well-suited for various missions, including crewed spaceflights.