Question

In which of the following gates the output is 1 if and only if at least one input is 1?

(a) AND

(b) NOR

(c) NAND

(d) OR

The question was posed to me at a job interview.

The above asked question is from Quine McCluskey or Tabular Method of Minimization of Logic Functions topic in division Boolean Algebra and Minimization Techniques and Logic Gates of Digital Circuits

Answer 1

Right answer is (d) OR

The best I can explain: In or gate we need at least one bit to be equal to 1 to generate the output as 1 because OR means any of the condition out of two is equal to 1 which means if at least one input is 1 then it shows output as 1.