Question

To get an output $y=0$ from the circuit shown in the figure, the input $C$ must be

• A. $0$
  
• B. $1$
  
• C. Either $0$ or $1$
  
• D. None of these

Answer 1

The correct option is A $0$

As we know, output of OR gate

$Y=A+B$

Output of AND gate

$Y^{\prime }$(final output) = $Y.C$

$\Rightarrow Y^{\prime }$ (final output) = $(A+B).C$

If $C=0$ irrespective of $A$ and $B$. then output $Y$ must be zero.