SSC General Science & Technology Sample Paper NCERT Sample Paper-6

  • question_answer
    Consider the following sentences with respect of cryogenic rocket engine-
    1. It uses liquid hydrogen as fuel and liquid oxygen as oxidizer at super cooled state.
    2. The combination of hydrogen and oxygen offers highest calorific value for rocket engine that needs to produce large amount of thrust.
    3. Propellants at liquid state having more density than that of gaseous state, thereby more propellants can be stored on fuel tank.
    4. Russia was the 1st country to develop cryogenic rocket engine. Which of the following statements given above is/are correct?

    A)  2 and 4 are correct        

    B)  1 and 4 are correct

    C)  All of them are correct   

    D)  1, 2 and 3 are correct

    Correct Answer: D

    Solution :

    [d] The United States was the first country to develop cryogenic rocket engines. The Centaur upper stage, with RL-10 engines, registered its first successful flight in 1963 and is still used on the Atlas V rocket. America's early mastery of the technology paved the way for the J-2 engine, which powered the upper stages of the immensely powerful Saturn V rocket that sent humans to the Moon.

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