Which logic gate has two or more inputs and one output and performs the OR operation?

Which logic gate has two or more inputs and one output and performs the OR operation?

• A. NAND Logic Gate
• B. OR Logic Gate
• C. NOR Logic Gate
• D. AND Logic Gate

Answer: (B)

An OR gate takes two or more inputs and gives a single output, performing the OR operation: the output goes high as soon as any input is high. For two inputs, the output is 1 if either input is 1 (or both are 1); it’s 0 only when all inputs are 0. This behavior naturally extends to three or more inputs—the output remains 1 as long as at least one input is 1. This distinguishes it from other gates: an AND gate outputs 1 only if every input is 1; a NAND gate is the inverse of AND; a NOR gate is the inverse of OR. Since the described device matches the OR function with multiple inputs and a single output, it is an OR gate.

An OR gate takes two or more inputs and gives a single output, performing the OR operation: the output goes high as soon as any input is high. For two inputs, the output is 1 if either input is 1 (or both are 1); it’s 0 only when all inputs are 0. This behavior naturally extends to three or more inputs—the output remains 1 as long as at least one input is 1.

This distinguishes it from other gates: an AND gate outputs 1 only if every input is 1; a NAND gate is the inverse of AND; a NOR gate is the inverse of OR. Since the described device matches the OR function with multiple inputs and a single output, it is an OR gate.