A NOT gate can be implemented by
(A) a single diode
(B) two diodes
(C) a single resistor
(D) a single transistor
Correct Answer : a single transistor
Question Asked : SSC Graduate Level Tier-I Exam 2013
Explanation : In digital logic, an inverter or NOT gate is a logic gate which implements logical negation. An inverter circuit outputs a voltage representing the opposite logic-level to its input. Inverters can be constructed using a single NMOS transistor or a single PMOS transistor coupled with a resistor.
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