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    Question

    Rocket works on the principle of which one of the

    following?
    A Energy conservation Correct Answer Incorrect Answer
    B Momentum conservation Correct Answer Incorrect Answer
    C Avogadro's hypothesis Correct Answer Incorrect Answer
    D Bernoulli theorem Correct Answer Incorrect Answer

    Solution

    A rocket works on the principle of momentum conservation. According to Newton's third law of motion, every action has an equal and opposite reaction. In the context of rockets, when the rocket engine expels propellant gases out the back at high speed (action), the rocket itself is pushed forward (reaction). This is the conservation of momentum: the momentum lost by the gases being ejected backward is gained by the rocket moving forward.

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