In the name of ALLAH, the most beneficient, the most merciful

Computer Architecture and Assembly Language Programming (CS401)

Multiple Choice Questions (MCQs)

 

Objective Questions

Question

Which of the following gives the more logical view of the storage medium?

  1. BIOS
  2. DOS
  3. Both
  4. None

Answer: 2 Chapter No. 13 

Question

An 8 x 16 font is stored in ______________ bytes.

  1. 2
  2. 4
  3. 8
  4. 16

Answer: 4 Chapter No. 12 

Question

In DOS input buffer, the number of characters actually read on return is stored in ___________ byte.

  1. 3rd
  2. 4th
  3. 1st
  4. 2nd

Answer: 4 Chapter No. 12 

Question

Which of the following interrupts is Non maskable interrupt?

  1. INT 2
  2. INT 3
  3. INT 0
  4. INT 1

Answer: 1 Chapter No. 8 

Question

In STOSW instruction, when DF is clear, DI is ___________

  1. Incremented by 1
  2. Incremented by 2
  3. Decremented by 1
  4. Decremented by 2

Answer: 2 Chapter No. 7 

Question

Which bit of the attributes byte represents the red component of foreground color?

  1. 5
  2. 4
  3. 3
  4. 2

Answer: 4 Chapter No. 6 

Question

SP is associated with ____________ , by default.

  1. SS
  2. DS
  3. CS
  4. ES

Answer: 1 Chapter No. 2 

Question

When a 32 bit number is divided by a 16 bit number, the quotient is of _______.

  1. 32 bits
  2. 16 bits
  3. 8 bits
  4. 4 bits

Answer: 2 Chapter No.  

Question

In the instruction MOV AX, 5 the number of operands are _______.

  1. 1
  2. 2
  3. 3
  4. 4

Answer: 1 Chapter No.  

Question

In DOS input buffer, number of characters actually read on return is stored in _______.

  1. 1st byte
  2. 2nd byte
  3. 3rd byte
  4. 4th byte

Answer: 2 Chapter No.  

Question

Which of the following is used to terminate a string in assembly language?

  1. !
  2. #
  3. $
  4. ;

Answer: 3 Chapter No.  

Question

In multitasking, which of the following interrupts is used as scheduler during context switching?

  1. INT 21
  2. INT 16
  3. INT 13
  4. INT 8

Answer: 4 Chapter No.  

Question

We can set the current file position in DOS using service number ________.

  1. 0x38
  2. 0x40
  3. 0x42
  4. 0x43

Answer: 3 Chapter No.  

Question

In the context of video services, if we want to set cursor position which of the following will be the value of AH?

  1. AH = 01h
  2. AH = 02h
  3. AH = 03h
  4. AH = 04h

Answer: 2 Chapter No.  

Question

Which of the following registers hold the page number for using the write string service of INT 10?

  1. AH
  2. BL
  3. CL
  4. BH

Answer: 4 Chapter No.  

Question

______ is the highest priority interrupt in interrupt controller.

  1. IRQ 0
  2. IRQ 1
  3. IRQ 2
  4. IRQ 3

Answer: 1 Chapter No.  

Question

The 'program segment prefix' for com files is of size:

  1. 64 bytes
  2. 128 bytes
  3. 256 bytes
  4. 512 bytes

Answer: 1 Chapter No.  

Question

"INT 13-BIOS disk services" generally uses which register to return the 'error code'?

  1. CF
  2. DL
  3. AH
  4. AL

Answer: 3 Chapter No.  

Question

Which of the following services of INT 10 is used for writing the string?

  1. 0x12
  2. 0x13
  3. 0x11
  4. 0x10

Answer: 2 Chapter No.  

Question

Which of the following INT 21 service is used to read character from standard input?

  1. 00
  2. 01
  3. 02
  4. 03

Answer: 2 Chapter No.