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NEET NEET SOLVED PAPER 2019

  • question_answer
    The correct Boolean operation represented by the circuit diagram drawn is: [NEET 5-5-2019]

    A) NAND

    B) NOR

    C) AND                

    D) OR

    Correct Answer: A

    Solution :

    LED glows when Both switches are OFF if are one is ON or both ON, LED will be short and becomes OFF            
    A B Y(LED)
    0 OFF 0 (OFF) 1 (ON)
    0 (OFF) 1 (ON) 1 (ON)
    1 (ON) 0 (OFF) 1 (ON)
    1 (ON) 1 (ON) 0 (OFF)
    \[y=\text{(}\overline{\text{AB}}\text{)}=NAND\]            


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