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Welcome to the 80386 and 80486 Microprocessor MCQs Page

Dive deep into the fascinating world of 80386 and 80486 Microprocessor with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of 80386 and 80486 Microprocessor, a crucial aspect of Microprocessor. In this section, you will encounter a diverse range of MCQs that cover various aspects of 80386 and 80486 Microprocessor, from the basic principles to advanced topics. Each question is thoughtfully crafted to challenge your knowledge and deepen your understanding of this critical subcategory within Microprocessor.

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80386 and 80486 Microprocessor MCQs | Page 7 of 13

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Q61.
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

Discuss
Answer: (d).all of the mentioned
Q62.
The segments in 80386 real mode are

a.

overlapped

b.

non-overlapped

c.

either overlapped or non-overlapped

d.

none of the mentioned

Discuss
Answer: (c).either overlapped or non-overlapped
Q63.
The operation that can be performed on segments in 80386 real mode is

a.

read

b.

write

c.

execute

d.

all of the mentioned

Discuss
Answer: (d).all of the mentioned
Q64.
The selectors contain the segment’s

a.

segment limit

b.

base address

c.

access rights byte

d.

all of the mentioned

Discuss
Answer: (d).all of the mentioned
Q65.
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

Discuss
Answer: (a).effective address + segment base address
Q66.
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

Discuss
Answer: (b).physical address
Q67.
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

Discuss
Answer: (b).physical address
Q68.
The paging unit is enabled only in

a.

virtual mode

b.

addressing mode

c.

protected mode

d.

none of the mentioned

Discuss
Answer: (c).protected mode
Q69.
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

Discuss
Answer: (d).64 TB
Q70.
The bit that indicates whether the segment has been accessed by the CPU or not is

a.

base address

b.

attribute bit

c.

present bit

d.

granular bit

Discuss
Answer: (b).attribute bit
Page 7 of 13

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