📝 Arithmetic and Logical Unit (ALU) of 8085 Microprocessor

📖 From An Introduction To Microprocessor 8085 • 5. The 8085 Microprocessor • 8 questions available

Practice MCQs for Arithmetic and Logical Unit (ALU) of 8085 Microprocessor. Test your knowledge with carefully crafted questions across easy, medium, and hard difficulty levels.

🔄 Last updated: 2026-07-30

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📝 Sample Questions

Q1. What is the bit‑width of the accumulator in the SAP‑III microprocessor?

🔹 A. 8‑bit

🔹 B. 16‑bit

🔹 C. 4‑bit

🔹 D. 32‑bit

💡 Difficulty: easy | ✅ Correct: A

Q2. Under what condition is the Zero (Z) flag set after an ALU operation?

🔹 A. Result equals zero

🔹 B. Result is negative

🔹 C. A carry out occurs

🔹 D. Result has odd parity

💡 Difficulty: medium | ✅ Correct: A

Q3. When the ALU adds 0x7F and 0x01, what are the states of the S, Z, CY, and P flags after the operation?

🔹 A. S=1, Z=0, CY=0, P=0

🔹 B. S=0, Z=0, CY=1, P=1

🔹 C. S=1, Z=1, CY=1, P=0

🔹 D. S=0, Z=1, CY=0, P=1

💡 Difficulty: hard | ✅ Correct: A

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🔗 Related Topics

📝 Architecture of 8085 Microprocessor 📝 Register Section of 8085 Microprocessor 📝 Address Buffer and Address Data Buffer of 8085 Microprocessor 📝 Timing and Control Unit of 8085 Microprocessor 📝 Interrupt Control of 8085 Microprocessor

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