PAI MCQ's SET-3
41.
Which of the following is a system segment register?
a) GDTR
b) LDTR
c) IDTR
d) none of the mentioned
Answer: b
42. The test register(s) that is provided by 80386 for page caching is
a) test control registers
b) page cache registers
c) test control and test status registers
d) test control and page cache registers
Answer: c
43. Among eight debug registers, DR0-DR7, the registers that are reserved by
Intel are
a) DR0, DR1, DR2
b) DR4, DR5
c) DR1, DR4
d) DR5, DR6, DR7
Answer: b
44. The registers that are used to store four program controllable break point
addresses are
a) DR5-DR7
b) DR0-DR1
c) DR6-DR7
d) DR0-DR3
Answer: d
45. The register DR6 hold
a) break point status
b) break point control information
c) break point status and break point control information
d) none of the mentioned
Answer: a
46. The flag bits that indicate the privilege level of current IO operations
are
a) virtual mode flag bits
b) IOPL flag bits
c) resume flag bits
d) none of the mentioned
Answer: b
47. The registers that are not available for programmers are
a) data and address registers
b) instruction pointers
c) segment descriptor registers
d) flag registers
Answer: c
48. Which of the following is not a scale factor of addressing modes of 80386?
a) 2
b) 4
c) 6
d) 8
Answer: c
49. 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
Answer: b
50. 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
Answer: a
51. In 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
Answer: c
52. 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
Answer: a
53. 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
Answer: b
54. Bit field can be defined as a group of
a) 8 bits
b) 16 bits
c) 32 bits
d) 64 bits
Answer: c
55. 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
Answer: c
56. 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
Answer: c
57. A 16-bit displacement that references a memory location using any of the
addressing modes is
a) pointer
b) character
c) BCD
d) offset
Answer: d
58. A decimal digit can be represented by
a) unsigned integer
b) signed integer
c) unpacked BCD
d) packed BCD
Answer: c
59. 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
Answer: b
60. 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
Answer: c
