250+ TOP MCQs on Register Organisation of 80386 -1 and Answers

Microprocessor Multiple Choice Questions on “Register Organisation of 80386 -1”.

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1. The 16-bit registers are available with their extended size of 32 bits, by adding the registers with a prefix of
a) X
b) E
c) 32
d) XX
Answer: b
Clarification: A 32 bit register, known as an extended register, is represented by the register name with a prefix of E.

2. In a 32-bit register, ESP, the lower 16-bits of the register can be represented by
a) LSP
b) FSP
c) SP
d) None of the mentioned
Answer: c
Clarification: Though the extended size of 32 bits are named as EBP, ESP, ESI and EDI, the names BP, SP, SI and DI represent the lower 16-bits.

3. Which of the following is a data segment register of 80386?
a) ES
b) FS
c) GS
d) All of the mentioned
Answer: d
Clarification: The six segment registers available in 80386 are CS, SS, DS, ES, FS and GS, out of which DS, ES, FS and GS are the four data segment registers.

4. The register width used by the 32-bit addressing modes is
a) 8 bits
b) 16 bits
c) 32 bits
d) all of the mentioned
Answer: d
Clarification: The 32-bit addressing modes may use all the register widths, i.e. 8, 16 or 32 bits.

5. The flag that is additional in flag register of 80386, compared to that of 80286 is
a) VM flag
b) RF flag
c) VM and RF flag
d) None of the mentioned
Answer: c
Clarification: The VM and RF flags are added to the 80286 flag register, to derive the flag register of 80386.

6. The VM (virtual mode) flag is to be set, only when 80386 is in
a) virtual mode
b) protected mode
c) either virtual or protected mode
d) all of the mentioned
Answer: b
Clarification: If VM flag is set, the 80386 enters the virtual 8086 mode within the protected mode. This is to be set only when the 80386 is in protected mode.

7. In protected mode of 80386, the VM flag is set by using
a) IRET instruction
b) Task switch operation
c) IRET instruction or task switch operation
d) None of the mentioned
Answer: c
Clarification: The VM flag can be set using the IRET instruction or any task switch operation, only in the protected mode.

8. During the instruction cycle of 80386, any debug fault can be ignored if
a) VM flag is set
b) VM flag is cleared
c) RF is cleared
d) RF is set
Answer: d
Clarification: If RF (resume flag) is set, any debug fault is ignored during the instruction cycle.

9. The RF is not automatically reset after the execution of
a) IRET
b) POPA
c) IRET and POPF
d) IRET and PUSHF
Answer: c
Clarification: The RF is automatically reset after the execution of every instruction, except for the IRET and POPF instructions. Also, it is not cleared automatically after the successful execution of JMP, CALL and INT instructions causing a task switch.

10. The segment descriptor register is used to store
a) attributes
b) limit address of segments
c) base address of segments
d) all of the mentioned
Answer: d
Clarification: The segment descriptor register is used to store the descriptor information like attributes, limit and base addresses of segments.