8086 Registers MCQs

Practice 8086 Registers MCQs with four options, answers and explanations for focused Electronics & Telecommunication Engineering revision.

Question 1

Microprocessors & Microcontrollers8086 Registers

Which register pair logically identifies the next instruction in the 8086?

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Correct Answer: A. CS:IP

Explanation: The next instruction is fetched using the code segment base from CS and the offset in IP.

Reference: Standard microprocessors and microcontrollers: 8086 registers

Question 2

Microprocessors & Microcontrollers8086 Registers

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Correct Answer: C. SS

Explanation: SS is the Stack Segment register and is commonly used with SP or BP.

Reference: Standard microprocessors and microcontrollers: 8086 registers

Question 3

Microprocessors & Microcontrollers8086 Registers

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Correct Answer: A. CS

Explanation: CS is the Code Segment register and works with IP for instruction fetching.

Reference: Standard microprocessors and microcontrollers: 8086 registers

Question 4

Microprocessors & Microcontrollers8086 Registers

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Correct Answer: A. AX

Explanation: AX is the accumulator register and can also be accessed as AH and AL.

Reference: Standard microprocessors and microcontrollers: 8086 registers

Question 5

Microprocessors & Microcontrollers8086 Registers

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Correct Answer: C. CX

Explanation: The LOOP instruction decrements CX and branches while CX is nonzero.

Reference: Standard microprocessors and microcontrollers: 8086 registers

Question 6

Microprocessors & Microcontrollers8086 Registers

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Correct Answer: A. SI and DI

Explanation: SI is the Source Index and DI is the Destination Index, widely used by string instructions.

Reference: Standard microprocessors and microcontrollers: 8086 registers