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NEET Physics Semiconducting Devices NEET PYQ-Semiconducting Devices

  • question_answer
    The truth table given below represents:                                                                         [AIPMT 2001]
    Input Output
    A B Y
    1 1 0
    0 1 1
    1 0 1
    0 0 1
               

    A) NOT gate

    B)      OR gate

    C)       XOR gate

    D)                  NAND gate

    Correct Answer: D

    Solution :

    The given truth table follows a “NAND” gate whose output is 1 only if at least one of its inputs is zero. Its Boolean expression is
                            \[Y=\overline{A\ .\,\,B}\]
                so that   \[\overline{1\ .\,\,1}=\,\overline{1}=0\]
                            \[\overline{0\,.\,\,1}=\,\overline{0}=1\]
                            \[\overline{1\,.\,0}=\,\overline{0}=1\]
                            \[\overline{0\,.\,0}=\,\overline{0}=1\]
    Note:    NAND gate is called as universal of digital building block because by the repeated use of NAND gates we can perform all the logic functions like OR, AND, etc.


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