CS401 Solved Grand Quiz Spring 2021

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CS401 Solved MCQs

mov [1234], ax is an example of ________________ addressing.

Direct

____jump is absolute and not position relative.

FAR

In Extended Multiplication, we store the Multiplication in _____ bits , and the result is stored in _____ bits

16 , 32

SHL and SAL are same

True

Simple CMP instruction uses _____operation

Subtraction

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

The Execution of the instruction “mov word [ES:160]”willm print a character on the screen at the_____

First, second

The segment off set pair is called a/an__________address.

Logical

If AX=00FF, then which of the following instruction can be used to change the value of AX to FF00

AND AX,FF00

Total NUMBER of reserved interrupts un the intel 8088 are_____

A/An ____ is an area of memory that holds all local variables and parameters.

Stack

____________is used for temporary diversion.

CALL

The swap flag can be stored in _____________

A Register

The JUMP is taken if the last arithmetic has produced a positive number in its destination

JNP

OUR computer screen is like a 2-D array having _____ rows and ______ columns.

25, 40

The correlation process from the interrupt a number to the interrupt handler uses a table is called.

Interrupt Vector table

The 8088 processor divides interrupts into_____classes.

Two

__________function decrements SP ( the STACK pointer) by, Two, and then transfer a word from the source operand to the top of the stack now pointed to by SP.

PUSH

REPE repeats a string instruction while the _________

ZERO

Which of the following is the extension of object file?

.exe

Code size reduction and improvement in speed were the two reasons for introducing block processing instruction in the _____ processor.

8088

REP allows the instruction to be repeated__times.

EACH bit of the ______ register conveys a different meaning.

FLAGS

Scrolling is the process of the moving one or more lines towards this top or bottom of the screen, a and the new line that appears on the top or bottom is____

cleared

The most convenient place to store local variables is ______

Stack

When SI or DI are used, we name the method ____ addressing.

indexed

A value 0500 is stored in my memory. If we transfer this value to a general-Purpose register. Then it will be shown as

0500

In iAPX88, when an element is poped from the stack .SP is ______by 2

DECREMENTED

Which of the following is used to clear the direction flag?

cld

In __________________ operation, a zero is inserted from the left and every bit moves one position to the right. The right most bit is dropped into the carry flag.

shift logical right operation

iAPX88 consist of______register

Also observe that with the CALL instruction ___is decremented by two from FFFE to FFFC, and the stack windows shows 0150 at its top.

For example the clear screen operation initializes this whole block to

0/0720.

Software interrupts on the contrary are not generated from outside the processor. They just provide an extended call mechanism. Far call allows us to jump anywhere in the whole megabyte of memory.

Far

The ____and DPL have the same meaning as in data and code descriptors.

The maximum parameters a subroutine can receive are _____when all the general registers are used.

Seven

In general the memory cell cannot be wider than the width of the

data bus.

BP the default segment used is

SS.

IN 8051 by the same manufacturer has an______ stack

Incrementing

Mov [1234] ax is an example of —- addressing.

Direct

The important thing to observe in the ASCII table is the contiguous arrangement of the uppercase alphabets (41-5A), the lowercase alphabets (61-7A), and the numbers

(30-39).

How many are the functions of a register.

Two

B80500, B8 was the opcode and

0500

In the opcode B80500, B8 was the opcode and 0500 was the operand stored immediately

afterwards

Scrolling is the process when all the lines on the screen move one or more lines towards the top of towards the bottom and the new line that appears on the top or the bottom is

cleared.

This precise synchronization between the processor and the memory is the responsibility of the

control bus.

In the _________the carry flag is inserted from the left, every bit moves one position to the right, and the right most bit is dropped in the carry flag

rotate through carry right instruction(RCR),

the interrupt call loads new values in CS, IP, and

FLAGS.

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

Destination

How logical errors are different from syntax error _____ is generally used in a loop instead the REP.

Identifying syntax and logical errors is responsibility of assembler and programmer respectively

LODS

The instructions for permanent diversion in intel 8088 is

jmp

In _______a zero is inserted from the right, and every bit moves one position to its left , the most significant bit drops into the carry flag.

______subtracts one from its single operand.

DEC

Which of the following formulaes calculates the desired location on the screen?

location = ( hypos * 80 + epos ) * 2

Stack is a data structure that behaves in a first in last _____manner.

Out

8088 is a_________ processor with its accumulator and all registers of

16 bits

REPE or REPNE are used with the _______instructions.

SCAS

____________can be used to check whether particular bits of a number are set or not.

AND

Which of the following flags sets when a larger number is subtracted from a smaller number?

When an element is pushed on the stack, SP is decremented by _______

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

AND

“mov [bx], ax” moves the two byte contents of the AX register to the address contained in the BX register in the current

data segment.

OR operation in assembly

“or ax, bx”

AX and BX. There are _____ AND operations as a result; one for every bit of AX

operand of POP is called _______since data is moving from the stack to the operand.

Destination

8088 is a _____ bit processor with its accumulator and all registers of

Whenever an element is pushed on the stack SP is decremented by

Two

The______ has a special role in debugging

trap flag

The convention to return a value from a subroutine is to use

the AX register

The iAPX88 architecture consists

of 14 registers..

the CALL instruction _____is decremented by two

The P and DPL have the same meaning as in data and code descriptors.

. The maximum parameters a subroutine can receive are ____when all the general registers are used.

Seven

memory cell cannot be wider than the width of

the data bus.

BP is attached to SS by default

In 8051, there is an _____stack

Incrementing

in the ASCII table is the contiguous arrangement of the uppercase alphabets (41-5A), the lowercase alphabets (61-7A), and the numbers

(30-39).

multiply two 32bit numbers and store the answer in a 64bit location.

In the opcode B80500, B8 was the opcode and 0500 was the operand stored immediately afterwards

0500

The first instruction of “COM” file must be at offset

0x0010
0x0100
0x1000
0x0000

The iAP888 architecture consists of ___________ register.

One screen location corresponds to a

Byte
Word
Double type
Double word

When an item is pushed on the decrementing stack, the top of the stack is

First decremented and then element copied to the stack
First incremented and then element copied to the stack
decremented after the element copied to the stack
incremented after the element copied to the stack

Each screen location corresponds to a word, the lower byte of this word contains _________.

The character code
The attribute byte
the parameters
The dimensions

If ax contains decimal -2 and BX contains decimal 2 then after the execution of

Instruction: CMP AX, BX, JA label

Jump will be taken
Zero flag will set
2F will contain value -4
Jump will not be taken

Only instructions allow moving data from memory to memory.

String
Word
Indirect
Stack

In a video memory, each screen location corresponds to _______

One byte
Two bytes
Four bytes
Eight bytes

mov ax,5 has

1 operand
2 operand
3 operand
4 operand

The physical address of the stack is obtained by

SS:SI combination
SS:SP combination
ES:BP combination
ES:SP combination

Index registers are used to store _____________

Data
Intermediate result
Address
Both data and addresses

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

32 bits
16 bits
8 bits
4 bits

If the direction of the processing of a string is from higher addresses towards lower addresses then

ZF is cleared
DF is cleared
ZF is set
DF is set

The instruction ADC has ________ Operand(s)

Which bit of the attribute byte represents the red component of background color?

In STOS instruction, the implied source will always be in

AL or AX registers
DL or DX registers
BL or BX registers
CL or CX registers

When a 32 bit number is divided by a 16 bit number, the quotient will be store in

“mov byte [num1], 5” is ______ instruction.

Legal
Illegal
Stack bases
Memory indirect

To transfer control back the RET instruction take

1 argument
2 arguments
3 arguments
No arguments

The maximum parameters a subroutine can receive (with the help of registers) are

The basic function of SCAS instruction is to

Compare
Scan
Sort
Move data

The bits of the ____________ work independently and individually.

Index register
Base register
Flags register
Accumulator

To convert any digit to its ASCII representation

Add 0x30 in the digit
Subtract 0x30 from the digit
Add 0x61 in the digit
Subtract 0x61 from the digit

Each screen contains location corresponds to a word, the lower byte of this word contains _____

The character code
The attribute byte
The parameters
The dimensions

JC and JNC test the _____________ flag.

Carry
Parity
Zero
Sign

After the execution of REP instruction CX will be decremented then which of the following flags will be affected?

CF
OF
DF
No flags will be affected

___________ register holds the address of next instruction is to be executed

Base pointer
Code segment
Source index
Program counter

The clear screen operation initializes whole block of video memory to

0417
0714
0721
0174

The 8088 processor divides interrupts into _____ classes.

One
Two
Three
Four

Which of the following directive used to reserve a 8 bit space in the memory holding data?

The base pointer accesses local variables using _______ offsets.

Negative

2. Which of the following describes the purpose of MOVS instruction?

Move memory to memory

3. Which part of this (0000000B80500) encoded instruction is an offset?

0500

4. Stack is a data structure that behaves a first in last _______ manner. Out

5. In the instruction “mov word [es:160], 0x1230”, 30 represents ______ character. 0

6. Multiplying two 4 bit numbers result in a ________ bit number.

7. In case of near jump, the relative address is stored in _______ bits.

8. _______ instructions have two parameters, one is the general purpose register to be loaded and the other is the memory location from which to load these registers.

LDS

9. Physical memory address is of

20 bit

10. ________ ports which interface the processor to the external world, including keyboards, mice, monitors, disc drives.

Input, outpu

11. In base+offset addressing, the value contained in the base register is add with offset to get ______.

Effective address

12. In 8051, there is an _________ stack. Incrementing

13. AX register can be divided into ______ and _____ bytes

Lower, higher

14. CLI stands for

Clear the interrupt flag

15. When a 32 bit number is divided by a 16 bit number, the remainder is of

16 bits

16. MUL instruction performs an unsigned multiplication of _______ with the source operand.

Accumulator

17. DW can store ______ bit value in it.

18. When the stack pointer, points to the return address? When the bubble sort subroutine is called

19. IAPX88 stands for ________.

Intel Advanced Processor Extensions 88

20. 90 is the op-code of Do nothing

21. When characters are stored in any high level or low level language, the actual thing stored in a byte is their ______.

ASCII code

22. We can convert any digit to ______ by adding 0x30 in the digit.

ASCII

23. A complete _______ is called a pass over the array

Iteration

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

25. In _______ operation the carry flag is inserted from the right causing every bit to move one location to its left and the most significant bit occupying the carry flag. Rotate Through Carry Left (RCL)

26. ASCII table is the contiguous arrangement of the uppercase alphabets (41-5A), the lowercase alphabets (61-7A), and the numbers _________.

30-39

27. _______ can also be used as a masking operation to invert selective bits.

XOR

28. BH register is a _______ bit register.

29. Which of the following is the renamed version of conditional jump JZ?

30. SP is associated (by default) with _______.

31. The maximum amount of memory accessible using 8085 processor is ________.

64 KB

32. In XOR operation the output is 1 if

Both inputs are different

33. The clear screen operation initializes whole block of video memory to:

0720

34. The 8088 processor divides interrupts into ______ classes.

Two

35. Which of the following directive is used to reserve a 8 bit space in the memory for holding data?

36. All mathematical and logical operations are performed on the _______

Accumulator

37. ______ jump is not position relative but is absolute

Far

38. Which of the following bit that “Shift Logical Right” operation copies in the carry flag?

Right most bit

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

Program counter

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

Address bus

41. _________ containing the address of the next instruction to be executed. Instruction pointer (IP)

42. To convert the case of a character, we add or subtract ________ from its ASCII code.

0x20

43. Which of the following instruction is effectively same as to multiply the value of AX by 8?

SHL AX, 8

MUL AX,3

44. ______ interrupts are those which occur side by side with some other activity.

Synchronous

45. During CALL operation, the current value of the _________ is automatically saved on the stack, and the destination of CALL is loaded in the instruction pointer.

Instruction pointer

46. In SCAS Example, we use SCASB with _____ and a zero in AL register to find a zero byte in a string

REPNE

47. In interrupt vector table. Introducing a new entry in this mapping table is called ______an interrupt.

Hooking

48. What does the following instruction do? ADD AX. BX

Add both registers and load value into ax register

49. The process through which the segment register can be explicitly specified as known as

Segment addressing

50. REPE and REPNE prefixes are only meaningful with _______.

CMPS

51. ________ refers to the total number of bits in a memory cell.

Cell width

52. The _______ operation is about shifting 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.

Shift Arithmetic Right (SAR)

53. _____ and _____ cannot be used as 8bit register pairs like AX, BX, CX, and DX.

SI, DI

54. AX and BX both are 16-bit register, if we perform AND operation on these two registers, then how many AND operations will be performed?

16 And operation

55. 8085 can access up to _______ of memory, whereas 8088 can access up to ________ of memory.

64Kb, 1Mb

56. CS and IP are both ______ bit registers.

57. In 8080, there is a _____ stack.

Decrementing

58. An important role of the stack is in the creation of ____variables that are only needed while the subroutine is in execution and not afterward.

Local

59. ____ movement of data is not allowed in assembly language.

Memory-to-Memory

60. With the execution of CALL instruction, the value of____ is decremented by 2.

61. In interrupt vector table, introducing a new entry in the mapping table is called____ an interrupt.

Hocking

62. Which of the following is the most illegal instruction? Mov al, ax

63 Motorola follows____

Big endian

64. Which of the following instruction allows code reusability in 8088?

CALL

65. When the first thing popped off from the stack, the stack would be the return “address” and not the ____

Argument

66. ___ decrements SP (the stack pointer) by two and then transfers a word from source operand to the top of stack now pointed to by SP,

PUSH

67. Which of the following is a Program Control Instruction?

cmp ax,0

68. Logical addressing is a mechanism to access ___ memory.

Physical memory

69. In assembly language “JN2” is used to Jump if the zero flag is not set

70. In segmented memory model, the size of one window is restricted to ______.

64 KB

71. Twenty-bit register is formed by the combination of two ___ bit register.

Sixteen

72. MOV[BX+SI+300],AX is a _____ addressing mode instruction.

Base + index + offset

73. Physical address calculating depends on

Effective address

74. There are ____ registers in iAPX88 architecture that can hold address of data.

75. ____ also known as source operand since the data is moving to stack from this operand.

PUSH

76. By default CS is associated with

77. The stack pointer contains the address of the word that is currently on ______.

Top the stack

78. If AX=OOFF, then which of the following instruction can be used to change the value of AX to FFOO

ANDAX, FFOO

79. All addressing mechanisms in iAPX88 return a number called ___ address.

Effective

80. In 8088 processor, interrupts are divided into the following classes. Software Interrupts, Hardware Interrupts

81. Which of the following is the interrupt number for NMI? INT 3

82. here are ___ registers in IAPX88 architecture that can hold address of data. 4

83. Use of AND operation to make selective bits zero in its destination operand is known as_____.

Selective Bit Clearing

84. Standard ASCII has ____ characters? 128

85. ____ is used to store both the instructions to be executes by the microprocessor and the data to be used in the computation.

Microprocessor

86. Number of operands of ADC ( add with carry) register are: 3

87. DX play an important role in arithmetic

Addition.

88.Stack is a

Data Structure

89. REPE or REPNE are used with the ————instructions

SCAS

90. __________Instruction have two parameters, one is the general purpose register to be loaded and other is the memory location from which to load these registers

LDS

91. Keywords used to define two bytes program

92. The shift logical left operation is the exact______ of shift logical right

Opposite

94. Sending the appropriate signal on the control bus to the memory is the responsibility of Control Bus

95. A parallel port has ——- views

96. The mechanism used to drop carry for making the calculated address valid is known is

address wraparound

97. In________ a zero is inserted form right and every bit moves one position to its left wth most significant but dropping in to carry flag

Both SHL and SAL

98. The reduction in code size and the improvement in speed are the two reasons why block processing instruction were introduced in the _____ Processor

8080

99. Mov ax, [NUM1] is a ______ bit move instruction.

100. Which of the following is the interrupt number for debug interrupt

INT 3

101. Each entry of the interrupt vector table is of ____ bytes

102. If BL contains 000000101 then after a Singe Right Shift, BL will contain

00000010

103. ______can be used to check weather particular bit of number are set or not

AND

104. When the relative address stored with the instruction is in 16 bit , the jump is called a ______jump

Near

105. The Stack of 8088 works on ___Sized element

Word

105. The interrupt call loads new values in segment

Flag

106. Mov AX, 0XB800, Move ES, AX : this instruction points ES to

Video Base

107. When the operant of DIV instruction is of 16 bits then implied dividend will be of

Bits

108. Which bit is attribute but representing the blue component of foreground color

109. When the operand of DIV instruction is of 16-bits then implied dividend will be stored in

AX Register

110. Constant can never be used as

destination

111. DB-25 is a _____Port Connector

Parallel

112. Flag register is a special register in every architecture ,, is as also known as

Program Status Word

113. BP stands for

base pointer

114. Intel follows

little endian

115. Mov [1234].ax is an example of

direct addressing

116. OR is used to clear any specific bit in a binary number

117. In general the memory cell cannot be wider than the width of the

data bus.

118. Source operand always resided in

accumulator register

119. ________always resided in accumulator register

source operand

120. INT instruction takes _____argument varying from 0-255.

1 byte

122. Program consists of

logical parts

123. 8088 provides a mechanism for mapping interrupts to interrupt handlers is called h

hooking an interrupt.

124. The routine that executes in response to an INT instruction is called the ________or_____

interrupt service routine (ISR) , the interrupt handler.

125. The push operation copies its operand on the stack , while the____operation makes a copy from the top of the stack into its operand.

pop

126. ROR : in the rotate right operation 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.

127. The segment, offset pair is called a

logical address

128. the local variables and the parameters are always stored in

stack segment

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

130. JNP and JPO is taken if the last arithmetic operation produced a number in its destination that has

odd parity

130. JP and JPE is taken if the last arithmetic operation produced a number in its destination that has

even parity.

131. There are two forms of the DIV instruction.

132. Unconditional jump

always transfer the control

133. The group of bits that the processor uses to inform the memory about which element to read or write is collectively known as the

address bus.

134. ADC has three operands

135. In direct addressing the memory address given in the instruction is

fixed

136. In which of the following addressing, the memory address is fixed and is given in the instruction?

Direct

137. _______pair of registers used to access memory

DI and SI

138. Total number of cells is called the

depth

139. ________copies the______in the carry flag

Shift Logical Right (SHR) , right most bit

140. REP with _______ will utilize the full processor power to do the scrolling in minimum time.

MOVS

141. The correlation process from the interrupt number to the interrupt handler uses a table called

interrupt vector table

142. POP is also known as

destination operand

143. The parallel port connector is a 25pin connector called

DB-25

144. The _________port connector is a 25pin connector called DB-25

parallel

145. There are just ______ block processing instructions in 8088.

146. Interrupts are ______and unpredictable

asynchronous

147. ______instruction allows code reusability in 8088

CALL

148. Program Control Instructions

cmp ax, 0

149. In MULTIPLICATION ALGORITHM ,We take the first digit of the multiplier and multiply it with the

multiplicand

150. _______jump is taken if the last arithmetic operation changed the sign unexpectedly.

151. ______is a special instructions

CLI

152. the interrupt call loads new values in

153. A 32bit processor has an accumulator of

32 bits.

154. Left shift on hexa-decimal number 9C40 ans is

0x13880

154. Each entry of the table is of ____bytes

four

155. Video Graphics Adapter

VGA.

156. The instruction “mov [bp], al” moves the one byte content of the AL register to the address contained in the BP register in the current

stack segment.

158. STI stands for

Set Interrupt Flag

159. Flags register is a special register in every architecture, it is also known as

program status word

160. A special register exists in every processor called

the program counter or the instruction pointer

161. mov word [es:160], 0x1230 12 meaning

green color on blue background.

162. ______can store 16 bits

163. two variants of STOS are ______and_____STOSB, STOSW

164. Another important role of the stack is in the creation of _____that are only needed while the subroutine is in execution and not afterwards.

local variables

165. In Far jump

both offset and segment are given

167. to multiply a number in register by 2 the number is

shift left one bit

168. In case of downward compatible mechanism, the codes written for 8080 are ______for 386 processor

Valid

169. Interrupt hooking is the mechanism that is used for mapping interrupt to interrupt handler

170. Which of the following statement is used to clear the value of AX register, xor ax,

171. Which assembly instruction is used to ADD data at address 1200 to bx register

add bx, [1200]

172. Chose the correct option from the following addressing modes , from which both register moves into the data segment

base+offset

173. _______operation , a carry flag is inserted from left moving every bit one position to the right, with the right most bit is dropped in carry flag

RCR

175. After the execution of SAR

instruction most significant bit retains its original value

175. _____is the part of microprocessor that ménages the execution of instruction

Control unit

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

set

177. When SI and DI are used, we name the method

Indexed Addressing

178. Which combination will you prefer to obtain the physical address of the stack

SS:SP

179. Whenever we need access to a memory location whose address is not know until run time we use

index register

180. Interrupts are________event

asynchronous

181. During program execution , if any change in AH or AL is reflected in_______as Well

182. Basic function of register is to

hold operand

183. Which among the following is the pointer registers?

index pointer and decession pointer

184. mov [bx], ax moves the two bytes content of AX register to the address contained in BX register in the current

data segment

185. in string manipulation the instruction to clear the direction flag is

CLD

186. If A is subtracted from B and the resulting answer is negative figure it means B is

small number

187. in ___ operation the output is 1 only if only if both inputs are 1 ?

AND

188. The interrupt call loads new values in CS, IP, and

FLAGS.

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CS401 Solved Grand Quiz Spring 2021

CS401 Solved MCQs

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