| Physics CUET question

PhysicsSemiconductors and Electronic Devices

Answer & explanation

Correct answer: option 1

The given diagrams involve 2 gates.
The first 1 is an AND gate followed by a NOT Gate, with the compliment of the output of first gate used as an input to the other gate which is NAND gate as NOT gate.
We consider the 4 combinations
$A = 1, B = 1, A B = 1, (A B)^{'} = 0,$\bar{AB} = 1$, Y = 0$
$A = 1, B = 0, A B = 0, (A B)^{'} = 1,$\bar{AB} = 0$, Y = 1$
$A = 1, B = 0, A B = 0, (A B)^{'} = 1,$\bar{AB} = 0$, Y = 1$
$A = 0, B = 0, A B = 0, (A B)^{'} = 1,$\bar{AB} = 0$, Y = 1$

The above configuration represents that of an AND gate.