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    Question

    The vacuum tube that was used in the first generation of

    computers is also called ______.
    A Open circuit Correct Answer Incorrect Answer
    B Closed circuit Correct Answer Incorrect Answer
    C Connector Correct Answer Incorrect Answer
    D Valve Correct Answer Incorrect Answer

    Solution

    Vacuum tubes, also called a valve are electronic devices that use a vacuum to insulate and shield against electric currents. They were cylindrical glass tubes that controlled the flow of electrons. 

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