Q.

The circuit diagram shown here corresponds to the logic gate
 

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a

NOR 

b

AND

c

OR

d

NAND

answer is A.

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Detailed Solution

With A open B open current passes through R an LED; so LED glows; hence output Y = 1In remaining all possible A and B ie; A open, B closed; A closed, B open; A closed, B closed; through short (closed) current passed and LED does not glow hence Y = 0

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