Question

For a two input logic gate, when the inputs are 'zero' and 'zero' the output is 'one'. When the inputs are 'one' and 'zero' the output is 'zero'. The type of logic gate is

• A. NAND
• B. OR
• C. NOR
• D. XOR

Hint:

Check the given rows against the truth tables of NAND, OR, NOR and XOR.

Answer 1

The Correct Option is C

Step 1: Given Rows:
Inputs \((0,0)\) give output 1. Inputs \((1,0)\) give output 0.

Step 2: Check Each Gate:
NAND: \((0,0)\to1\) fits, but \((1,0)\to1\), which does not match.
OR: \((0,0)\to0\), which does not match.
NOR: \((0,0)\to1\) fits, and \((1,0)\to0\) fits.
XOR: \((0,0)\to0\), which does not match.

Step 3: Conclusion:
Only the NOR gate satisfies both rows. A NOR gate gives 1 only when both inputs are 0.

Final Answer:
The gate is a NOR gate, option (C). \[ \boxed{\text{(C) NOR}} \]