CS401- Computer Architecture and Assembly Language Programming McQs collection Part3
Question No: 1 ( M a r k s: 1 )
The physical address of the stack is obtained by
► SS:SP combination
► SS:SI combination
► SS:SP combination
► ES:BP combination
► ES:SP combination
Question No: 2 ( M a r k s: 1 )
After the execution of instruction “RET ”
► SP is incremented by 2
► SP is incremented by 2
► SP is decremented by 2
► SP is incremented by 1
► SP is decremented by 1
Question No: 3 ( M a r k s: 1 )
The second byte in the word designated for one screen location holds
► Character color on the screen
► The dimensions of the screen
► Character position on the screen
► Character color on the screen
► ASCII code of the character
Question No: 4 ( M a r k s: 1 )
REP will always
► Decrement CX by 1
► Increment CX by 1
► Increment CX by 2
► Decrement CX by 1
► Decrement CX by 2
Question No: 5 ( M a r k s: 1 )
The basic function of SCAS instruction is to
► Compare
► Compare
► Scan
► Sort
► Move data
Question No: 6 ( M a r k s: 1 )
Index registers are used to store __________
►Address
►Data
►Intermediate result
►Address
►Both data and addresses
Question No: 7 ( M a r k s: 1 )
The bits of the _____________ work independently and individually
►flags register
►index register
►base register
►flags register
►accumulator
Question No: 8 ( M a r k s: 1 )
To convert any digit to its ASCII representation
► Add 0x30 in the digit
► Add 0x30 in the digit
► Subtract 0x30 from the digit
► Add 0x61 in the digit
► Subtract 0x61 from the digit
Question No: 9 ( M a r k s: 1 )
When a 32 bit number is divided by a 16 bit number, the quotient is of
► 4 bits
► 32 bits
► 16 bits
► 8 bits
► 4 bits
Question No: 10 ( M a r k s: 1 )
When a 16 bit number is divided by an 8 bit number, the quotient will be in
► AL
► AX
► AL
► AH
► DX
Question No: 11 ( M a r k s: 1 )
Which mathematical operation is dominant during the execution of SCAS instruction
► Division
► Division
► Multiplication
► Addition
► Subtraction
Question No: 12 ( M a r k s: 1 )
If AX contains decimal -2 and BX contains decimal 2 then after the execution of instructions:
CMP AX, BX
JA label
► Zero flag will set
► Jump will be taken
► Zero flag will set
► ZF will contain value -4
► Jump will not be taken
Question No: 13 ( M a r k s: 1 )
The execution of the instruction “mov word [ES : 160], 0x1230” will print a character “0” on the screen at
► First column of second row
► Second column of first row
► First column of second row
► Second column of second row
► First column of third row
Question No: 14 ( M a r k s: 1 )
If the direction of the processing of a string is from higher addresses towards lower addresses then
► DF is cleared
► ZF is cleared
► DF is cleared
► ZF is set
► DF is set
Question No: 15 ( M a r k s: 1 )
The instruction ADC has________ Operand(s)
► 3
► 0
► 1
► 2
► 3
Question No: 16 ( M a r k s: 1 )
Which bit of the attributes byte represents the red component of background color ?
► 3
► 3
► 4
► 5
► 6
Question No: 17 ( M a r k s: 2 )
What is difference between SHR and SAR instructions?
SHR
The SHR inserts a zero from the left and moves every bit one position to the right and copy the rightmost bit in the carry flag.
SAR
The SAR shift every bit one place to the right with a copy of the most significant bit left at the most significant place. The bit dropped from the right is caught in the carry basket. The sign bit is retained in this operation.
Question No: 18 ( M a r k s: 2 )
For what purpose "INT 1" is reserved ?
Question No: 19 ( M a r k s: 2 )
Define implied operand?
It is always in a particular register say the accumulator. It needs to not be mentioned in the instruction.
Q=1:
Which bit of attributes byte represents the blue component of foreground color?
- 0
- 1
- 2
- 3
Q=2:
The clear screen operation initializes the whole block of video memory to:
- 0417
- 0714
- 0741
- 017
Q=3:
When the operand of DIV instruction is of 16 bit then implied dividend will be of
- 64-bit
- 32-bits
- 16-bits
- 8--bits
Q=4
Which of the following is the pair of register used to access memory instring instruction:
- DI and BP
- SI and BP
- DI and SI
- DS and Si
Q=5
A fat32 file system directory entry in DOS consist of how many bytes?
- 16
- 24
- 32
- 64
Q=6:
Which register is generally used to specify the services number of an interrupt?
DX
AX
BX
Which register is generally used to specify the services number of an interrupt?
DX
AX
BX
CX
………………………………………………………………………………………….
Q=7:
In 9 pin db 9 connector ,which pin is assigned to RD(received data)
………………………………………………………………………………………….
Q=7:
In 9 pin db 9 connector ,which pin is assigned to RD(received data)
- 1
- 2
- 3
- 4
Q=8
In case of COM file, maximum length of parameters passed through command line can be……….
- 63 bytes
- 127bytes
- 255 bytes
- 511 bytes
Q=9
We can access the DOS service using;
- Int 0x21
- Int 0x13
- Int 0x 10
- Int 0x 08
Q=10
In 9 pin 9 connector,which pin is assigned to signal ground
- 3
- 4
- 5
- 6
Q=11:
BPB stands for
- Basic parameter block
- Bios precise block
- Basic precise block
- Bios parameter block
Q=12
Int 13-bios disk service “generally uses which register to return the error flag?
- CF
- DL
- AH
- AL
Q=13:
The first sector on the hard disk contains the
- Hard disk size
- Partition table
- Data size
- Sector size
Q=14
Operating system organize data in the form of
- Folder
- Batch file
- File
- None of above
………
Q=15
In 9 pin db 9 connector, which pin is assigned to TD(transmitted data)
Q=15
In 9 pin db 9 connector, which pin is assigned to TD(transmitted data)
- 1
- 2
- 3
- 4
Q=16”
Device derive can be divided into ----------major categories.
- 5
- 4
- 3
- 2
1. BL contains 5 decimal then after right shift , BL will become
- 3
- 2.5
- 5
- 10
2. 8 * 16 font is stored in ________ bytes.
- 3
- 4
- 8
- 16
3. In DOS input buffer , number of characters actually read on return is stored in
- First byte
- Second byte
- Third byte
- Fourth byte
4. IRQ 0 has priority
- Low
- High
- Highest
- Medium
5. Thread registration code initialize PCB and add to linked list so that _____ will give it turn.
- Assembler
- Linker
- Scheduler
- Debugger
6. Traditional calling conventions are in ______ number
- 1
- 2
- 3
- 4
7. VESA VEB 2.0 is standard for
- High Resolution Mode
- Low Resolution Mode
- Very High Resolution Mode
- Medium Resolution Mode
8. To clear direction flag which instruction is used
- Cld
- Clrd
- Cl df
- Clr df
9. In STOSW instruction , When DI is cleared , SI is
- Incremented by 1
- Incremented by 2
- Decremented by 1
- Decremented by 2
10. Interrupt that is used in debugging with help of trap flag is
- INT 0
- INT 1
- INT 2
- INT 3
11. INT for arithmetic overflow is
- INT 1
- INT 2
- INT 3
- INT 4
12. IRQ referred as
- Eight Input signals
- One Input signal
- Eight Output signals
- One output signal
13. IRQ for keyboard is ____1_____
14. IRQ for sound card is ______5_______
15. IRQ for floppy disk is ______6_______
16. IRQ with highest priority is
- Keyboard IRQ
- Timer IRQ
- Sound Card
- Floppy Disk
17. Pin for parallel port ground is
- 10-18
- 18-25
- 25-32
- 32-39
18. The physical address of Interrupt Descriptor Table (IDT) is stored in
- GDTR
- IDTR
- IVT
- IDTT
19. Execution of “RET 2” results in?
20. CX register is
- Count register
- Data register
- Index register
- Base register
21. OUT instruction uses __AX_____ as source register.
22. IN DB-9 connector the Data Set ready pin is at
- 5
- 6
- 7
- 8
23. If two devices uses same IRQ then there is
- IRQ collision
- IRQ conflict
- IRQ drop
24. VESA organizes 16 bit color for every pixel in ratio
- 5:5:5
- 5:6:5
- 6:5:6
- 5:6:7
25. Division by zero is done by which interrupt.
Interrupt 0.
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