MCQS

Subject : -Meseg Goes here

1 - Address always goes from1. Processor to meory2. Memory to processor3. Memory to memory4. None of the above Correct Choice : 1 From Lectuer # 1

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2 - Register whose each bit specify a different meaning is1. Accumulator Register2. Pointer Register3. Index register4. Flag register Correct Choice : 4 From Lectuer # 1


3 - Group of bits processor uses to inform memory which element to read/write iscollectively known as

1. Control bus2. Data bus3. Address bus4. RAM Correct Choice : 1 From Lectuer # 1


4 - Instruction Pointer holds the address of the1. Previous instruction to be executed2. Current instruction3. Next instruction to be executed4. None of the given Correct Choice : 3 From Lectuer # 1


5 - There are three busses to communicate the processor and memory named as_____________

1. address bus.,data bus and data bus.2. addressing bus.,data bus and data bus.3. address bus.,datamove bus and data bus.4. address bus.,data bus and control bus.. Correct Choice : 4 From Lectuer # 1


6 - The address bus is unidirectional and address always travels from processor tomemory.

1. TRUE2. FALSE3. 4. Correct Choice : 1 From Lectuer # 1

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7 - Data bus is bidirectional because________1. To way2. Data moves from both, processor to memory and memory to processor,3. Data moves from both, processor to memory and memory to data Bus,4. None of the Given Correct Choice : 3 From Lectuer # 1


8 - Control bus________1. is Not Important.2. is Important .3. bidirectional.4. unidirectional . Correct Choice : 3 From Lectuer # 1


9 - A memory cell is an n-bit location to store data, normally ________also called a byte1. 4-bit2. 8-bit3. 6-bit4. 80-bit Correct Choice : 2 From Lectuer # 1


10 - The number of bits in a cell is called the cell width.______________ define thememory completely.

1. Cell width and number of cells,2. cell number and width of the cells,3. width4. Height Correct Choice : 1 From Lectuer # 1


11 - for memory we define two dimensions. The first dimension defines how many__________bits are there in a single memory cell.

1. parallel2. Vertical3. long4. short Correct Choice : 1 From Lectuer # 1


12 - __________ operation requires the same size of data bus and memory cell width.1. Normal2. Best and simplest3. first4. None of the Given Correct Choice : 2 From Lectuer # 1


13 - Control bus is only the mechanism. The responsibility of sending the appropriatesignals on the control bus to the memory is of the_________________.

1. Data Bus

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2. processor3. Address Bus4. None of the Given Correct Choice : 2 From Lectuer # 1




15 - Registers are also called scratch pad ram1. TRUE2. FALSE3. 4. Correct Choice : 1 From Lectuer # 2


16 - Register are storage cell1. Outside the processor2. Inside the processor3. Both inside and outside the processor4. None of the given Correct Choice : 2 From Lectuer # 2


17 - CX register mostly use a1. Counter register2. Flag register3. Base register4. Desination register Correct Choice : 1 From Lectuer # 2


18 - The basic purpose of a computer is to perform operations, and operations need____________.

1. order2. nothing3. operands4. bit Correct Choice : 3 From Lectuer # 2


19 - Registers are like a scratch pad ram inside the processor and their operation is verymuch like normal______________.

1. Number2. opreations3. memory cells4. None of the Given Correct Choice : 3 From Lectuer # 2

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20 - There is a central register in every processor called the _______ and The word size ofa processor is defined by the width of its__________.

1. accumulator,accumulator2. data bus,accumulator3. accumulator, Address Bus4. accumulator,memory Correct Choice : 1 From Lectuer # 2


21 - ___________does not hold data but holds the address of data1. Pointer, Segment, or Base Register2. Pointer, Index, or Base Register3. General Registers4. Instruction Pointer Correct Choice : 2 From Lectuer # 2


1. executed.2. called3. deleted4. copy Correct Choice : 1 From Lectuer # 2


1. 42. 53. 34. 2 Correct Choice : 1 From Lectuer # 2


24 - These instructions are used to move data from one place to another.1. TRUE2. FALSE3. 4. Correct Choice : 1 From Lectuer # 2


1. Arithmetic and Logic Instructions2. Data Movement Instructions3. Program Control Instructions4. Special Instructions Correct Choice : 2 From Lectuer # 2


26 - ______________allow changing specific processor behaviors and are used to playwith it.

1. Special Instructions2. Data Movement Instructions

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3. Program Control Instructions4. Arithmetic and Logic Instructions Correct Choice : 1 From Lectuer # 2


27 - 8088 is a 16bit processor with its accumulator and all registers of __________.1. 32 bits2. 6 bits3. 16 bits4. 64 bits Correct Choice : 3 From Lectuer # 2


28 - The __________ of a processor means the organization and functionalities of theregisters it contains and the instructions that are valid on the processor.

1. Manufactures2. architecture3. Deal4. None of the Given Correct Choice : 2 From Lectuer # 2


29 - Intel IAPX88 Architecture is ___________1. More then 25 old2. New3. Not Good4. None of the Given Correct Choice : 1 From Lectuer # 2


30 - By default CS is associated with1. SS2. BP3. CX4. IP Correct Choice : 4 From Lectuer # 3


31 - Size Mismatch Error is a syntax error1. FALSE2. TRUE3. 4. Correct Choice : 1 From Lectuer # 3


32 - Intel follow1. Littel endian2. Big endian3. Both littel endian and big endian4. None of the given Correct Choice : 1 From Lectuer # 3


33 - The extension of assembly languague file is

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1. .doc2. .com3. .lst4. .asm Correct Choice : 4 From Lectuer # 3


34 - All the addressing mechanisms in iAPX88 return a number called _____________address.

1. Effective address2. Physical address3. Direct address4. None of the given Correct Choice : 1 From Lectuer # 3


35 - Register to Register Operation is not allowed1. TRUE2. FALSE3. 4. Correct Choice : 2 From Lectuer # 3


36 - The iAPX88 architecture consists of______registers.1. 132. 123. 94. 14 Correct Choice : 4 From Lectuer # 3


37 - General Registers are ______________1. AX, BX, CX, and DX2. XA, BX, CX, and DX3. SS,SI and DI4. 3 Correct Choice : 1 From Lectuer # 3


1. AH and AL2. A Lower and A Upper3. AL, AU4. AX Correct Choice : 1 From Lectuer # 3


39 - AX is General purpose Register where A stands for__________.1. Acadmic2. Ado3. Architecture4. Accumulator Correct Choice : 4 From Lectuer # 3

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40 - The B of BX stands for _________because of its role in memory addressing.1. Busy2. Base3. Better4. None of the Given Correct Choice : 2 From Lectuer # 3


41 - The D of DX stands for Destination as it acts as the destination in_____________________.

1. I/O operations2. operations3. memory cells4. Memory I/O operations Correct Choice : 1 From Lectuer # 3


42 - The C of CX stands for Counter as there are certain instructions that work with anautomatic count in the ___________.

1. DI register2. BX register3. CX register4. DX register Correct Choice : 3 From Lectuer # 3


43 - _________are the index registers of the Intel architecture which hold address of dataand used in memory access.

1. SI and SS2. PI and DI3. SI and IP4. SI and DI Correct Choice : 4 From Lectuer # 3


44 - In Intel IAPX88 architecture ___________ is the special register containing theaddress of the next instruction to be executed.

1. AX2. PI3. IP4. SI Correct Choice : 3 From Lectuer # 3


45 - SP is a memory pointer and is used indirectly by a set of ____________.1. instructions2. Pointers3. Indexes4. Variables Correct Choice : 1 From Lectuer # 3


46 - ___________is also a memory pointer containing the address in a special area of

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memory called the stack.1. SP2. BP3. PB4. AC Correct Choice : 2 From Lectuer # 3


47 - ____________is bit wise significant and accordingly each bit is named separately.1. AX2. FS3. IP4. Flags Register Correct Choice : 4 From Lectuer # 3


1. carry flag2. Parity Flag3. Auxiliary Carry4. Zero Flag Correct Choice : 1 From Lectuer # 3


49 - Program is an ordered set of instructions for the processor.1. TRUE2. FALSE3. 4. Correct Choice : 1 From Lectuer # 3




1. Add the bx to ax and change the bx2. Add the ax to bx and change the ax3. Add the bx to ax and change the ax4. Add the bx to ax and change nothing Correct Choice : 3 From Lectuer # 3


52 - Unconditional jump1. Execute in every condition whether true or false2. If the condition is true3. If the condition is false4. None of the given Correct Choice : 1 From Lectuer # 4

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53 - Memory to Memory operation is allowed1. TRUE2. FALSE3. 4. Correct Choice : 2 From Lectuer # 4


54 - we can not add two base register i.e. (bx+bp) or cant use in an instruction1. TRUE2. FALSE3. 4. Correct Choice : 1 From Lectuer # 4


55 - In direct addressing the memory address given in the instruction is1. Fixed2. Variable3. Register4. Empty Correct Choice : 1 From Lectuer # 4


56 - mov [1234],ax is an example of1. Direct addressing2. Base register indirect3. Base+index4. None of the given Correct Choice : 1 From Lectuer # 4


57 - we can not Subrtace index register from the base register( bx-si )in assemlbylanguage



58 - The maximum memory iAPX88 can access is________________.1. 1MB2. 2MB3. 3MB4. 128MB Correct Choice : 1 From Lectuer # 4


59 - The maximum memory iAPX88 can access is 1MB which can be accessed with_______________.

1. 18 bits2. 20 bits

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3. 16 bits4. 2 bits Correct Choice : 2 From Lectuer # 4


60 - _____________address of 1DED0 where the opcode B80500 is placed.1. physical memory2. memory3. efective4. None of the Given Correct Choice : 1 From Lectuer # 4


61 - 16 bit of Segment and Offset Addresses can be converted to 20bit Address i.eSegment Address with lower four bits zero + Offset Address with ______ four bits zero =20bit Physical Address

1. Middle2. lower3. Top4. upper Correct Choice : 4 From Lectuer # 4


62 - When adding two 20bit Addresses a carry if generated is dropped without beingstored anywhere and the phenomenon is called address______.

1. wraparound2. mode3. ping4. error Correct Choice : 1 From Lectuer # 4


63 - segments can only be defined a 16byte boundaries called _____________boundaries.

1. segment2. paragraph3. Cell4. RAM Correct Choice : 1 From Lectuer # 4


64 - in a Program CS, DS, SS, and ES all had the same value in them. This is called_____________________.

1. equel memory2. overlapping segments3. segments hidding4. overlapping SI Correct Choice : 2 From Lectuer # 4


65 - When a large number is subtracted from a smaller number, a borrow is needed; in thiscase which flag will be set

1. ZF2. CF

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3. SF4. OF Correct Choice : 2 From Lectuer # 5


66 - The jump is taken if the last arithmetic operation changed the sign unexpectedly.1. JO2. JNO3. JNZ4. JZ Correct Choice : 1 From Lectuer # 5


67 - This jump is taken if the last arithmetic operation produced a number in its destinationthat has even parity , Which jump is taken

1. JP2. JPE3. JNP4. both JP and JPE Correct Choice : 1 From Lectuer # 5


1. 1byte2. 4bit3. 16bit4. 2byte Correct Choice : 1 From Lectuer # 5


1. No comments Will be2. ; accumulate sum in add3. ; accumulate sum in ax4. ; accumulate sum in Bx Correct Choice : 3 From Lectuer # 5


1. Immediate2. Indirect3. Direct4. Register Correct Choice : 4 From Lectuer # 5


1. Based Register Indirect2. Indirect3. Base Indirect4. Immediate Correct Choice : 1 From Lectuer # 5


72 - In JA jump is not taken after a CMP if the unsigned destination is larger than the

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unsigned source.1. TRUE2. FALSE3. 4. Correct Choice : 2 From Lectuer # 6


1. Immediate2. Indirect3. Indirect4. Register Correct Choice : 1 From Lectuer # 6


1. OFFSET+ Indirect2. Register + Direct3. Indirect + Reference4. BASEd REGISTER + OFFSET Correct Choice : 4 From Lectuer # 7


1. Address2. mode3. effective address4. Physical Address Correct Choice : 3 From Lectuer # 7


1. CS with BX2. BX with CS3. BX with AX4. None of the Given Correct Choice : 2 From Lectuer # 7


77 - For exampleBX=0100DS=FFF0 And Opcode are;move [bx+0x0100], Axnow what is the effective memory address;

1. 00202. 02003. 03004. 0x02 Correct Choice : 2 From Lectuer # 7


78 - For example

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BX=0100DS=FFF0 And Opcode are;move [bx+0x0100], Axnow what is the physical memory address;

1. 00202. 0x01003. 0x101004. 0x100100 Correct Choice : 2 From Lectuer # 7


1. Immediate2. Indirect3. Direct4. Register Correct Choice : 3 From Lectuer # 8


1. Basef Register Indirect2. Indirect3. Indexed Register Indirect4. Immediate Correct Choice : 3 From Lectuer # 8


1. Basef Register Indirect2. Indirect3. Direct4. illegal Correct Choice : 4 From Lectuer # 8


1. Address must be 16bit2. Address must be 8bit3. Address must be 4bit4. 8 bit to 16 bit move illegal Correct Choice : 4 From Lectuer # 8



84 - In JNE and JNZ there is difference for only _____________;1. Programmer or Logic2. Assembler3. Debugger4. IAPX88 Correct Choice : 1 From Lectuer # 9

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85 - JMP is Instruction that on executing take jump regardless of the state of all flags iscalled__________

1. Jump2. Conditional jump3. Unconditional jump4. Stay Correct Choice : 3 From Lectuer # 9


86 - When result of the source subtraction from the destination is zero, zero flag is set i.e.ZF=1its mean that;

1. DEST = SRC2. DEST != SRC3. DEST 4. DEST > SRC Correct Choice : 1 From Lectuer # 9


87 - When an unsigned source is subtracted from an unsigned destination and thedestination is smaller, borrow is needed which sets the ____________.

1. carry flag i.e CF = 02. carry flag i.e CF = 13. Carry Flag + ZF=14. None of the Given Correct Choice : 2 From Lectuer # 9


88 - In the case of unassigned source and destination when subtracting and in the resultZF =1 OR CR=1 then _______

1. DEST = SRC2. DEST != SRC3. UDEST ? USRC4. DEST > SRC Correct Choice : 3 From Lectuer # 9


89 - In the case of unassigned source and destination when subtracting and in the resultZF =0 AND CR=0 then _______

1. DEST = SRC2. DEST != SRC3. UDEST 4. UDEST > USRC Correct Choice : 4 From Lectuer # 9


90 - In the case of unassigned source and destination when subtracting and in the resultCR=0 then _______

1. DEST = SRC2. DEST != SRC3. UDEST 4. UDEST ? USRC Correct Choice : 4 From Lectuer # 9

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91 - ______This jump is taken if the last arithmetic operation produced a zero in itsdestination. After a CMP it is taken if both operands were equal.

1. Jump if zero(JZ)/Jump if equal(JE)2. Jump if equal(JE)3. Jump if zero(JZ)4. No Jump fot This Correct Choice : 1 From Lectuer # 9


92 - _______This jump is taken after a CMP if the unsigned source is smaller than orequal to the unsigned destination.

1. JBE(Jump if not below or equal)2. JNA(Jump if not above)/JBE(Jump if not below or equal)3. JNA(Jump if not above)4. No Jump fot This Correct Choice : 2 From Lectuer # 9


1. Literal2. Variable3. Label4. Starting point Correct Choice : 3 From Lectuer # 10


1. Shl2. sar3. Shr4. Sal Correct Choice : 3 From Lectuer # 10


1. Shl2. sar3. Shr4. Sal Correct Choice : 1 From Lectuer # 10


96 - ADC has _________ operands.1. two2. three3. Five4. Zero Correct Choice : 2 From Lectuer # 10


97 - 90 is the op-code of1. Do nothing2. Add

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3. Subtract4. Multiplication Correct Choice : 1 From Lectuer # 10


98 - Numbers of any size can be added using a proper combination of __________.1. ADD and ADC2. ABD and ADC3. ADC and ADC4. None of the Given Correct Choice : 1 From Lectuer # 11


99 - Like addition with carry there is an instruction to subtract with borrowscalled____________.

1. SwB2. SBB3. SBC4. SBBC Correct Choice : 2 From Lectuer # 11


1. 16 AND2. 17 AND3. 32 AND4. 8 AND Correct Choice : 1 From Lectuer # 12


101 - ____________can be used to check whether particular bits of a number are set ornot.

1. AND2. OR3. XOR4. NOT Correct Choice : 1 From Lectuer # 12


102 - __________can also be used as a masking operation to invert selective bits.1. AND2. OR3. XOR4. NOT Correct Choice : 3 From Lectuer # 12


103 - Masking Operations are Selective Bit ______________________1. Clearing, XOR, Inversion and Testing2. Clearing, Setting, Inversion and Testing3. Clearing, XOR, AND and Testing4. None of the Given Correct Choice : 2 From Lectuer # 12


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104 - The ____________ instruction allows temporary diversion and therefore reusabilityof code.

1. CALL2. RET3. AND4. XOR Correct Choice : 1 From Lectuer # 13


105 - CALL takes a label as _____________ and execution starts from that label,1. argument2. Lable3. TXt4. Register Correct Choice : 1 From Lectuer # 13


106 - When the __________instruction is encountered and it takes execution back to theinstruction following the CALL.

1. CALL2. RET3. AND4. XOR Correct Choice : 2 From Lectuer # 13


107 - _______________________ Both the instructions are commonly used as a pair,however technically they are independent in their operation.

1. RET and ADC2. Cal and SSb3. CALL and RET4. ADC and SSB Correct Choice : 3 From Lectuer # 13


108 - The CALL mechanism breaks the thread of execution and does not changeregisters, except ____________.

1. SI2. IP3. DI4. SP Correct Choice : 2 From Lectuer # 13


109 - Which type of Rotation it is "Every bit moves one position to the right and the bitdropped from the right is inserted at the eft. This bit is also copied into the carry flag."

1. ROL2. RCR3. RCL4. ROR Correct Choice : 4 From Lectuer # 13


110 - SHL and SAL are same

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111 - Which type of shifting is "Inserts a zero from the left and moves every bit oneposition to the right and copies the rightmost bit in the carry flag."

1. SHL2. SAL3. SAR4. SHR Correct Choice : 4 From Lectuer # 13


112 - Stack is a ______ that behaves in a first in last out manner.1. Program2. data structure3. Heap4. None of the Given Correct Choice : 2 From Lectuer # 14


113 - If ____________ is not available, stack clearing by the callee is a complicatedprocess.

1. CALL2. SBB3. RET n4. None of the Given Correct Choice : 3 From Lectuer # 14


114 - When the stack will eventually become full, SP will reach 0, and thereafterwraparound producing unexpected results. This is called stack ________

1. Overflow2. Leakage3. Error4. Pointer Correct Choice : 1 From Lectuer # 14


115 - The pop operation makes a copy from the top of the stack into its_______________.1. Register2. operand3. RET n4. Pointer Correct Choice : 2 From Lectuer # 14


116 - _______________decrements SP (the stack pointer) by two and then transfers aword from the source operand to the top of stack

1. PUSH2. POP

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3. CALL4. RET Correct Choice : 1 From Lectuer # 14


117 - POP transfers the word at the current top of stack (pointed to by SP) to thedestination operand and then __________ SP by two to point to the new top of stack.

1. increments2. dcrements3. ++4. -- Correct Choice : 1 From Lectuer # 14


1. POP, ADC2. CALL, RET3. CALL, RET n4. PUSH, POP Correct Choice : 4 From Lectuer # 14


119 - To access the arguments from the stack, the immediate idea that strikes is to__________ them off the stack.

1. PUSH2. POP3. CALL4. Rrgister Correct Choice : 2 From Lectuer # 15


120 - push bpwe are ________________

1. sending bp copy to stack2. making bp copy from stack3. pushing bp on the stack4. doing nothing Correct Choice : 3 From Lectuer # 15


121 - Local Variables means variables that are used within the ___________________1. Subroutine2. Program3. CALL4. Label Correct Choice : 1 From Lectuer # 15


122 - Standard ASCII has 128 characters with assigned numbers from ________.1. 1to 1292. 0 to 1273. 0 to 1284. None of the Given Correct Choice : 2 From Lectuer # 16

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1. 0x602. 0x903. 0x304. 0x40 Correct Choice : 4 From Lectuer # 16


124 - Which bit is refer to the Blinking of foreground character1. 62. 73. 54. 3 Correct Choice : 2 From Lectuer # 16


125 - Which bit is refer to the Intensity component of foreground color1. 42. 53. 34. 7 Correct Choice : 3 From Lectuer # 16


126 - Which bit is refer to the Green component of background color1. 12. 53. 34. 7 Correct Choice : 2 From Lectuer # 16


127 - Which bit is refer to the Green component of foreground color1. 12. 53. 34. 7 Correct Choice : 1 From Lectuer # 16


128 - String can be indicate bye given1. db 0x61, 0x61, 0x632. db 'a', 'b', 'c'3. db 'abc'4. All of the above Correct Choice : 4 From Lectuer # 16


129 - The first form divides a 32bit number in DX:AX by its 16bit operand and stores the___________ quotient in AX

1. 16bit2. 17bit3. 32bit

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4. 64bit Correct Choice : 1 From Lectuer # 17


130 - The ___________ (division) used in the process is integer division and not floatingpoint division.

1. DIV instruction2. ADC instruction3. SSB instruction4. DIVI instruction Correct Choice : 1 From Lectuer # 17


131 - ______________(multiply) performs an unsigned multiplication of the sourceoperand and the accumulator.

1. Multi2. DIV3. MUL4. Move Correct Choice : 3 From Lectuer # 18


132 - The desired location on the screen can be calculated with the following formulae.1. location = ( hypos * 80 + SP ) * 32. location = ( hypos * 80 + slocation ) * 23. location = ( hypos * 80 + epos ) * 24. None of the Given Correct Choice : 3 From Lectuer # 18


133 - To play with string there are 5 instructions that are __________1. STOS, LODS, CMPS, SCAS, and MOVS2. MUL, DIV, ADD, ADC and MOVE3. SSB, ADD, CMPS, ADC, and MOVS4. None of the Given Correct Choice : 1 From Lectuer # 18


134 - _______transfers a byte or word from register AL or AX to the string elementaddressed by ES:DI and updates DI to point to the next location.

1. LODS2. STOS3. SCAS4. MOVE Correct Choice : 2 From Lectuer # 18


135 - ____________ transfers a byte or word from the source location DS:SI to AL or AXand updates SI to point to the next location.


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136 - _______compares a source byte or word in register AL or AX with the destinationstring element addressed by ES: DI and updates the flags.



137 - ____________ repeat the following string instruction while the zero flag is set andREPNE or REPNZ repeat the following instruction while the zero flag is not set.

1. REP or REPZ2. REPE or REPZ3. REPE or RPZ4. RPE or REPZ Correct Choice : 2 From Lectuer # 18


138 - The execution of instruction mov word [es:160], 0x1230, will print a character on thescreen at.

1. First column of second row2. Second column of first row3. Second column of second row4. First column of third row Correct Choice : 4 From Lectuer # 19


139 - In the instruction mov word [es:160], 0x1230, 30 represents the character.1. A2. B3. 04. 1 Correct Choice : 3 From Lectuer # 20


140 - LES loads ______________1. ES2. DS3. PS4. LS Correct Choice : 1 From Lectuer # 20


141 - LDS loads_______.1. ES2. DS3. PS4. LS Correct Choice : 2 From Lectuer # 20


142 - REP allows the instruction to be repeated ____________ times allowing blocks ofmemory to be copied.

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1. DX2. CX3. BX4. AX Correct Choice : 2 From Lectuer # 20


143 - ___________pops IP, then CS, and then FLAGS.1. Ret n2. REZA3. REPE4. IRET Correct Choice : 4 From Lectuer # 21


144 - ________ , Trap, Single step Interrupt1. INT 02. INT 13. INT 34. INT 0 Correct Choice : 2 From Lectuer # 21


145 - _________,NMI-Non Maskable Interrupt1. INT 02. INT 13. INT 34. INT 0 Correct Choice : 3 From Lectuer # 21


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