Question

A NOR gate has two input I₁ and l₂,and one output terminal Y. Which of the following configuration (truth table) is INCORRECT for the NOR gate?

• A. I₁=0,I₂=0,Y=1
• B. I₁=0,I₂=0,Y=0
• C. I₁=1,I₂=1,Y=0
• D. I₁=1,I₂=0,Y=0
• E. I₁=0,I₂=1,Y=0

Answer 1

The Correct Option is B

Given:

• NOR gate truth table options (A-E).

Step 1: Recall NOR Gate Logic

A NOR gate outputs 1 only when both inputs are 0. For all other input combinations, the output is 0.

Step 2: Evaluate Each Option

(A) \( I_1 = 0, I_2 = 0, Y = 1 \) → Correct (NOR output for 0,0).

(B) \( I_1 = 0, I_2 = 0, Y = 0 \) → Incorrect (should be 1).

(C) \( I_1 = 1, I_2 = 1, Y = 0 \) → Correct (NOR output for 1,1).

(D) \( I_1 = 1, I_2 = 0, Y = 0 \) → Correct (NOR output for 1,0).

(E) \( I_1 = 0, I_2 = 1, Y = 0 \) → Correct (NOR output for 0,1).

Conclusion:

The incorrect configuration is (B).

Answer 2

1. Understand the NOR gate:

A NOR gate gives an output of 1 (HIGH) only when both inputs are 0 (LOW). Otherwise, the output is 0 (LOW).

2. Analyze the truth table configurations:

• (A) I₁ = 0, I₂ = 0, Y = 1: Both inputs are LOW, so the output should be HIGH. This is CORRECT.
• (B) I₁ = 0, I₂ = 0, Y = 0: Both inputs are LOW, so the output should be HIGH. This is INCORRECT.
• (C) I₁ = 1, I₂ = 1, Y = 0: At least one input is HIGH, so the output should be LOW. This is CORRECT.
• (D) I₁ = 1, I₂ = 0, Y = 0: At least one input is HIGH, so the output should be LOW. This is CORRECT.
• (E) I₁ = 0, I₂ = 1, Y = 0: At least one input is HIGH, so the output should be LOW. This is CORRECT.

Final Answer: The incorrect configuration is \(\boxed{B}\)