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NEET Physics Semiconducting Devices NEET PYQ-Semiconducting Devices

  • question_answer
    The truth table for a logic gate is:
    Input Output
    A B Y
    1 1 0
    0 1 1
    1 0 1
    0 0 1
    The logic gate is:                                                                                                     [AIPMT 2002]

    A)        NAND gate    

    B)   XOR gate

    C)  NOR gate     

    D) OR gate

    Correct Answer: A

    Solution :

    The given truth table is for NAND gate. The output for NAND gate is 1 only when one of its inputs is zero.
                The Boolean expression for NAND gate is
                            \[Y=\overline{A\,.\,B}\]
                That is   \[\overline{1\,.1}=\bar{1}=0\]
                            \[\overline{0\,.1}=\bar{0}=1\]
                            \[\overline{1\,.0}=\bar{0}=1\]
                            \[\overline{0\,.0}=\bar{0}=1\]
                Note:    The symbol for NAND gate can be shown as:
                              Untitled-1
     


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