The output of an ' $\mathrm{OR}$ ' gate is 'one'

The output of an ' $\mathrm{OR}$ ' gate is 'one'
  1. only when both inputs are 'one'
  2. only when both inputs are 'zero'
  3. only when either input is 'zero'
  4. if either or both inputs are 'one'

Solution

The gate described is an OR gate, whose output is 'one' when either or both inputs are 'one'. Its truth table is: \begin{tabular}{|l|l|l|} \hline Input A & Input B & Output \\ \hline 0 & 0 & 0 \\ \hline 0 & 1 & 1 \\ \hline 1 & 0 & 1 \\ \hline 1 & 1 & 1 \\ \hline \end{tabular}

Asked in: MHT CET 2021 (20 Sep Shift 1)

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