Engineering Questions with Answers - Multiple Choice Questions
Microprocessors MCQ – Addressing Modes of 80386, Data Types of 80386
1 - Question
Which of the following is not a scale factor of addressing modes of 80386?
a) 2
b) 4
c) 6
d) 8
View Answer
Answer: c
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 - Question
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
Answer: b
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 - Question
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
Answer: a
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 - Question
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
Answer: c
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 - Question
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
Answer: a
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 - Question
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
Answer: b
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 - Question
Bit field can be defined as a group of
a) 8 bits
b) 16 bits
c) 32 bits
d) 64 bits
View Answer
Answer: c
Explanation: A group of at the most 32 bits(4 bytes) is defined as a bit field.
8 - Question
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
Answer: d
Explanation: Bit string is a string of contiguous bits of maximum 4Gbytes in length.
9 - Question
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
Answer: c
Explanation: The integer word is the signed 16-bit data.
10 - Question
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
Answer: d
Explanation: Offset is a 16-bit or 32-bit displacement that references a memory location using any of the addressing modes.
11 - Question
A decimal digit can be represented by
a) unsigned integer
b) signed integer
c) unpacked BCD
d) packed BCD
View Answer
Answer: c
Explanation: Decimal digits from 0-9 are represented by unpacked bytes.