Discussion
A two-input logic gate gives 'High' output only when either of the two inputs is high. For all other logics, it gives 'Low' output. Which is the gate?
Answer: D
The gate gives a high output only when exactly one of the two inputs is high, and a low output when both are low and also when both are high. That is the exclusive OR (XOR) gate, with the truth table 00 gives 0, 01 gives 1, 10 gives 1, 11 gives 0.
An ordinary OR gate gives a high output also when both inputs are high, so it does not fit the word 'only'. A NAND gate gives low only when both inputs are high, and a NOR gate gives high only when both are low. The answer is XOR, option D.
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