Real Address Mode of 80386, Protected Mode of 80386 MCQ’s

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This set of Microprocessor Multiple Choice Questions & Answers (MCQs) focuses on “Real Address Mode of 80386, Protected Mode of 80386″.

1. The unit that is disabled in real address mode is
a) central processing unit
b) memory management unit
c) paging unit
d) bus control unit

2. To form a physical memory address, appropriate segment register contents are
a) shifted by left by 4 positions
b) added to 16-bit offset address
c) operated using one of addressing modes
d) all of the mentioned

3. The instructions available in the 80386 that are not available in its real address mode is
a) addressing techniques
b) instructions for protected address mode
c) instructions for interrupt handling
d) all of the mentioned

4. The segments in 80386 real mode are
a) overlapped
b) non-overlapped
c) either overlapped or non-overlapped
d) none of the mentioned

5. The selectors contain the segment’s
a) segment limit
b) base address
c) access rights byte
d) all of the mentioned

6. If the paging unit is enabled, then it converts a linear address into
a) effective address
b) physical address
c) segment base address
d) none of the mentioned

7. The operation that can be performed on segments in 80386 real mode is
a) read
b) write
c) execute
d) all of the mentioned

8. The linear address is calculated by
a) effective address + segment base address
b) effective address – segment base address
c) effective address + physical address
d) effective address – physical address

9. If the paging unit is disabled, then the linear address is used as
a) effective address
b) physical address
c) segment base address
d) none of the mentioned

10. The paging unit is enabled only in
a) virtual mode
b) addressing mode
c) protected mode
d) none of the mentioned

11. For a single task in protected mode, the 80386 can address the virtual memory of
a) 32 GB
b) 64 MB
c) 32 TB
d) 64 TB

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