This set of Microprocessor Multiple Choice Questions & Answers (MCQs) focuses on “Addressing Modes of 80386, Data Types of 80386”.
1. Which of the following is not a scale factor of addressing modes of 80386?
a) 2
b) 4
c) 6
d) 8
View Answer
Explanation: In case of the scaled the modes, any of the index register values can be multiplied by a valid scale factor to obtain the displacement. The valid scale factors are 1, 2, 4 and 8.
2. Contents of an index register are multiplied by a scale factor that may be added further to get the operand offset in
a) base scaled indexed mode
b) scaled indexed mode
c) indexed mode
d) none of the mentioned
View Answer
Explanation: In scaled indexed mode, contents of an index register are multiplied by a scale factor that may be added further to get the operand offset.
3. Contents of an index register are multiplied by a scale factor and then added to base register to get the operand offset in
a) base scaled indexed mode
b) scaled indexed mode
c) indexed mode
d) none of the mentioned
View Answer
Explanation: In base scaled indexed mode, contents of an index register are multiplied by a scale factor and then added to base register to get the operand offset.
4. In the based scaled indexed mode with displacement mode, the contents of an index register are multiplied by a scale factor and are added to
a) base register
b) displacement
c) base register and displacement
d) none of the mentioned
View Answer
Explanation: Contents of an index register are multiplied by a scale factor and the result is added to a base register and a displacement to get the offset of an operand.
5. The following statement of ALP is an example of
MOV EBX, [EDX*4] [ECX].
a) base scaled indexed mode
b) scaled indexed mode
c) indexed mode
d) based scaled indexed mode with displacement mode
View Answer
Explanation: Since in base scaled indexed mode, contents of an index register are multiplied by a scale factor and then added to base register to get the operand offset.
6. The following statement is an example of
MOV EBX, LIST [ESI*2].
MUL ECX, LIST [EBP*4].
a) base scaled indexed mode
b) scaled indexed mode
c) indexed mode
d) based scaled indexed mode with displacement mode
View Answer
Explanation: Since in scaled indexed mode, contents of an index register are multiplied by a scale factor that may be added further to get the operand offset.
7. Bit field can be defined as a group of
a) 8 bits
b) 16 bits
c) 32 bits
d) 64 bits
View Answer
Explanation: A group of at the most 32 bits(4 bytes) is defined as a bit field.
8. The maximum length of the string in a bit string of contiguous bits is
a) 2 MB
b) 4 MB
c) 2 GB
d) 4 GB
View Answer
Explanation: Bit string is a string of contiguous bits of maximum 4Gbytes in length.
9. The integer word is defined as
a) signed 8-bit data
b) unsigned 16-bit data
c) signed 16-bit data
d) signed 32-bit data
View Answer
Explanation: The integer word is the signed 16-bit data.
10. A 16-bit displacement that references a memory location using any of the addressing modes is
a) Pointer
b) Character
c) BCD
d) Offset
View Answer
Explanation: Offset is a 16-bit or 32-bit displacement that references a memory location using any of the addressing modes.
11. A decimal digit can be represented by
a) unsigned integer
b) signed integer
c) unpacked BCD
d) packed BCD
View Answer
Explanation: Decimal digits from 0-9 are represented by unpacked bytes.
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