Computer Architecture and Assembly Language Programming (CS401)

1. Which of the following string instruction is generally used in a loop instead of REP prefix?

   1. SCAS
   2. LODS
   3. CMPS
   4. STOS

2. The jump is taken if the last arithmetic operation changed the sign unexpectedly.

   1. JO
   2. JNO
   3. JNZ
   4. JZ

3. "mov [bp], al" moves the one byte contents of the AL register to the address contained in BP register in the current ________.

   1. Stack Segment
   2. Data Segment
   3. Code Segment
   4. Extra Segment

4. mov [1234], ax is an example of

   1. direct addressing
   2. base register indirect
   3. base+index addressing
   4. register indirect addressing

5. ________ instruction makes the code reusable.

   1. Mov
   2. JMP
   3. CALL
   4. SHL

6. ________ and ________ are taken if the last arithmetic operation produced a number in its destination that has odd parity.

   1. JP, JPE
   2. JS, JNS
   3. JCX, JNS
   4. JNP, JPO

7. How many characters were defined by standard ASCII?

   1. 132
   2. 124
   3. 122
   4. 128

8. Which of the following addressing scheme has been used in the instruction MOV [BX], AX?

   1. Base Register Direct
   2. Base Register Indirect
   3. Base + Offset
   4. Base + Index

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

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

10. In case of 32-bit processor, the size of an accumulator register will be ________ bits.

    1. 16
    2. 8
    3. 32
    4. 64

11. ______ is the highest priority interrupt in interrupt controller.

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

12. 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

13. The execution of the instruction "mov word [ES : 160], 0x1230" will print a character on the screen at:

    1. first column of second row
    2. second column of first row
    3. second column of second row
    4. first column of third row

14. Which of the following interrupts is Non maskable interrupt?

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

15. In branching mechanism, the assembler

    1. Replaces the target with its address
    2. Does not replace until the test condition is satisfied
    3. Finds the Branch offset and replaces the Branch target with it
    4. Replaces the target with the value specified by the DATAWORD directive

16. ________ is set only when the last mathematical or logical operation produces a zero in its destination.

    1. Single Flag
    2. Zero flag
    3. Trap Flag
    4. Parity Flag

17. DX plays an important role in arithmetic ________.

    1. addition
    2. multiplication
    3. division
    4. subtraction

18. 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

19. If AX=5, BX=5, CF and ZF are set, AF and DX contains zero then after the execution of instruction "ADC AX, BX", AX will contain the value ________.

    1. 5
    2. 10
    3. 11
    4. 6

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

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

21. In general, width of a memory cell cannot be greater than the width of ________.

    1. Control Bus
    2. Data Bus
    3. Address Bus
    4. I/O Bus

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

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

23. Which of the following Move generates error in .com file?

    1. Legal move
    2. Illegal move
    3. Ambiguous move
    4. Fetal move

24. An 8 x 16 font is stored in ______________ bytes.

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

25. This jump is taken if the last arithmethic operation produced a positive number in its destination.

    1. JNP
    2. JO
    3. JNS
    4. JG

26. All mathematical and logical operations are performed on the ________.

    1. Accumulator
    2. Arithmetic Logic Unit
    3. Program Counter
    4. Flag Register

27. The instruction, MOV AX, 0005H belongs to the address mode of ________ .

    1. Register
    2. Direct
    3. Immediate
    4. Register Relative

28. There are just ________ block processing instructions in 8088.

    1. 6
    2. 5
    3. 4
    4. 3

29. MOV [BX+SI+300], AX is a ________ addressing mode instruction.

    1. Base + Index + Offset
    2. Base + Index
    3. Index Register Indirect + Offset
    4. Illegal

30. Which of the following register is used to hold address of the next instruction to be executed?

    1. Memory address register
    2. Memory data register
    3. Instruction registers
    4. Program counter

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

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

32. The jump command that does not depend on FLAG register is

    1. JCXZ
    2. JO
    3. JNE
    4. JP

33. Physical memory adresses is of

    1. 16 Bits
    2. 32 Bits
    3. 20 Bits
    4. 8 Bits

34. 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

35. Which of the following is a non-destructive AND operation?

    1. AND
    2. XOR
    3. OR
    4. Test

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

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

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

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

38. The extention of assembly languague file is

    1. .doc
    2. .com
    3. .lst
    4. .asm

39. The other directive is "define word" or "dw" with the same syntax as "db" but reserving a whole word of ________ bits instead of a byte.

    1. 32
    2. 8
    3. 16
    4. 64

40. ________ is a special instruction that load a segment register and a general purpose register from a memory locations.

    1. SCAS
    2. MOV
    3. CALL
    4. LES

41. When an element is pushed on the stack SP is decremented by ________.

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

42. ________ is a temporary storage places inside the processor.

    1. Memory
    2. Ram
    3. Cache
    4. Register

43. Group of bits processor uses to inform memory which element to read/write is collectively known as

    1. Control bus
    2. Data bus
    3. Address bus
    4. RAM

44. In ________ every bit moves one position to the right and the bit dropped from the right is inserted at the left and also copied into the carry flag?

    1. ROL
    2. RCR
    3. RCL
    4. ROR

45. The interrupt call loads new values in ________ segment.

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

46. Number of operands of ADC (add with carry) register are:

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

47. The 8088 processor divides interrupts into ________ classes.

    1. One
    2. Two
    3. Three
    4. Four

48. The purpose of MOVS instruction is:

    1. Move register to register
    2. Move register to a memory location
    3. Move a memory location to register
    4. Move memory to memory

49. The top of stack is contained in ________ register.

    1. SP
    2. BP
    3. AX
    4. BX

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

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

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

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

52. 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

53. Sending the appropriate signals on the control bus to the memory is the responsibility of ________.

    1. Memory
    2. Processor
    3. Control Bus
    4. Data Bus

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

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

55. Stack is a data structure that behaves in a first in last ________ manner.

    1. In
    2. Out
    3. Push
    4. Add

56. SCAS compares a source byte or word in register AL or AX with the ________ string element addressed by ES: DI and updates the flags.

    1. Source
    2. Destination
    3. Flag
    4. Register

57. There are ________ registers in iAPX88 architecture that can hold address of data.

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

58. MUL (multiply) instruction performs an unsigned multiplication of the source operand and the ________ .

    1. Accumulator
    2. Carry
    3. Word
    4. Base

59. Which of the following operation is used to clear any specific bit in a binary number?

    1. AND
    2. OR
    3. XOR
    4. NOT

60. CX register is mostly used as a

    1. counter register
    2. flag register
    3. base register
    4. destination register

61. 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

62. BH register is a ________ bit register.

    1. 8
    2. 16
    3. 24
    4. 32

63. What does the given instruction do?
    SHR DL, 1

    1. move right most bit in carry
    2. move bit in DL
    3. Shift and store the One bit in DL
    4. Shift and store the most bit in DL

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

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

65. All the addressing modes return the number after calculation, this number is known as ________ ?

    1. Base Address
    2. Offset Address
    3. Data Address
    4. Effective Address

66. 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

67. SP is associated with ____________ , by default.

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

68. Which part of this (00000000000 B80500) encoded instruction is an offset?

    1. First Column
    2. Second column
    3. B8
    4. 0500

69. In a comparison, if the both operands are same. The result of subtraction will be zero and the zero flag will be ________.

    1. Set
    2. Incremented
    3. Updated
    4. Decremented

70. ASCII table is the contiguous arrangement of the upercase alphabets (41-5A), the lowercase alphabets (61-7A), and the numbers ________.

    1. 31-40
    2. 29-39
    3. 30-39
    4. 31-41

71. ________ is the basic means of sorting temporary data on the stack.

    1. PUSH
    2. POP
    3. CALL
    4. RET

Select a course code for Objective Questions:

ACC311 ACC501 BIF101 BIF401 BIF501 BIO101 BIO201 BIO202 BIO203 BIO204 BIO301 BIO302 BIO303 BIO401 BIO503 BNK603 BT101 BT201 BT301 BT302 BT401 BT402 BT403 BT404 BT405 BT406 BT501 BT504 BT505 BT604 CHE201 CHE301 CS001 CS101 CS201 CS202 CS204 CS301 CS302 CS304 CS311 CS401 CS402 CS403 CS408 CS501 CS502 CS504 CS506 CS508 CS601 CS602 CS604 CS605 CS607 CS609 CS610 CS614 CS707 CS710 ECO401 ECO402 ECO403 ECO404 EDU302 EDU401 EDU402 EDU501 EDU601 ENG101 ENG201 ENG301 ENG501 FIN611 FIN624 FIN625 ISL201 IT430 MCM101 MCM301 MGMT623 MGT101 MGT211 MGT301 MGT401 MGT402 MGT501 MGT502 MGT503 MGT510 MGT601 MGT603 MKT501 MKT610 MKT630 MTH101 MTH202 MTH302 MTH501 MTH601 MTH634 PAK301 PHY101 PHY301 PSY101 PSY403 PSY502 PSY512 SOC101 SOC301 SOC401 STA301 STA630 STA641 ZOO102 ZOO401 ZOO501 ZOO502 ZOO503 ZOO504 ZOO505 ZOO506 ZOO510 ZOO630

Select a course code for Subjective Questions:

ACC311 CS001 CS101 CS201 CS301 CS607 CS701 CS702 CS703 CS704 CS707 CS708 CS710 CS711 CS718 CS721 CS724 ECO401 ECO403 ENG101 ENG301 MGT703 MTH501 STA301