NEET 2022 Physics Truth Tables MCQ Question

Chapter: Semiconductor Electronics

Class: 12 Physics Topic: Logic Gates Difficulty: 🟡 Medium

✅ Ans: A

The two NAND outputs are:

$$X=\overline{AB}$$ $$Y=\overline{\bar A B}$$

Final AND output:

$$C=X\cdot Y$$

Simplifying:

$$C=\overline{AB}\cdot\overline{\bar AB} =\boxed{\bar B}$$

Truth Table

❌ Other options

• B: $0,1,0,1$ → $C=B$
• C: $0,1,1,0$ → XOR
• D: $1,0,0,1$ → XNOR

📌 NCERT

NAND:

$$Y=\overline{AB}$$

NOT:

$$Y=\bar A$$

🧠 NEET Trick

Circuit simplifies to:

$$\boxed{C=\bar B}$$

So A = correct.