Ch 02: 16-Bit Segmented Memory Model & Addressing Modes

Deep dive into 16-bit real mode memory segmentation (CS, DS, SS, ES), pointer/index registers (SP, BP, SI, DI), and calculating effective physical addresses across memory boundaries.

395 Questions395 MCQs0 Short Questions0 Long Questions

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CS401 - Computer Architecture and Assembly Language Programming Examination Practice

Timed practice exam simulation for CS401 - Computer Architecture and Assembly Language Programming.

Showing 331 – 340 of 395 Questions

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Q331

❓ MCQ📘 CS401📑 Lec 2🏷️ 2.3. Addressing ModesMedium🔁⭐💡📄🎓VU🏛️VU

Why does the assembly statement 'MOV AX, [SI + DI]' produce a syntax error?

💻 assembly Snippet

mov ax, [si + di]  ; Illegal: cannot combine two index registers

A.Two index registers cannot be used together as a memory address
B.An index register cannot be used as a memory address
C.Destination register size mismatch
D.None of the given options

Q332

❓ MCQ📘 CS401📑 Lec 2🏷️ 2.7. Stack OperationsEasy🔁⭐💡📄🎓VU🏛️VU

The hardware stack is an abstract linear ________ that operates in a First-In, Last-Out (FILO) or Last-In, First-Out (LIFO) manner.

A.Program
B.Data structure
C.Heap
D.None of the given options

Q333

❓ MCQ📘 CS401📑 Lec 2🏷️ 2.7. Stack OperationsEasy🔁⭐💡📄🎓VU🏛️VU

When continuous push operations cause the stack to grow beyond its allocated boundary (where SP eventually wraps around past 0), overwriting critical memory, this condition is called stack ________.

A.Overflow
B.Leakage
C.Error
D.Pointer

Q334

❓ MCQ📘 CS401📑 Lec 2🏷️ 2.7. Stack OperationsEasy🔁⭐💡📄🎓VU🏛️VU

The POP operation copies the word element located at the top of the stack into its specified destination ________.

💻 assembly Snippet

pop ax

A.Register
B.Operand (Register or Memory)
C.RET n
D.Pointer

Q335

❓ MCQ📘 CS401📑 Lec 2🏷️ 2.7. Stack OperationsEasy🔁⭐💡📄🎓VU🏛️VU

Which assembly instruction decrements SP (the Stack Pointer) by two and then transfers a word from the source operand onto the top of the stack?

💻 assembly Snippet

push ax

A.PUSH
B.POP
C.CALL
D.RET

Q336

❓ MCQ📘 CS401📑 Lec 2🏷️ 2.7. Stack OperationsEasy🔁⭐💡📄🎓VU🏛️VU

Executing the POP instruction transfers the 16-bit word at the top of the stack (SS:SP) to the destination operand, and then ________ SP by two to adjust the stack frame.

💻 assembly Snippet

pop ax

A.Increments
B.Decrements
C.Increases by 4
D.Decreases by 4

Q337

❓ MCQ📘 CS401📑 Lec 2🏷️ 2.2. Data Definition DirectivesEasy🔁⭐💡📄🎓VU🏛️VU

In NASM assembly language, which of the following syntax declarations can be used to define a byte sequence representing the string 'abc'?

💻 assembly Snippet

db 'abc'
db 'a', 'b', 'c'
db 0x61, 0x62, 0x63

A.db 0x61, 0x62, 0x63
B.db 'a', 'b', 'c'
C.db 'abc'
D.All of the above

Q338

❓ MCQ📘 CS401📑 Lec 2🏷️ 2.1. Segment RegistersEasy🔁⭐💡📄🎓VU🏛️VU

The 'LES' instruction loads a 32-bit far pointer from memory, placing the segment selector into which segment register?

💻 assembly Snippet

les di, [far_ptr]

A.ES
B.DS
C.PS
D.LS

Q339

❓ MCQ📘 CS401📑 Lec 2🏷️ 2.1. Segment RegistersEasy🔁⭐💡📄🎓VU🏛️VU

The 'LDS' instruction loads a 32-bit far pointer from memory, placing the segment selector into which segment register?

💻 assembly Snippet

lds si, [far_ptr]

A.ES
B.DS
C.PS
D.LS

Q340

❓ MCQ📘 CS401📑 Lec 2🏷️ 2.7. Stack OperationsEasy🔁⭐💡📄🎓VU🏛️VU

The Stack Pointer (SP) register is a memory pointer that is modified indirectly by a set of stack manipulation ________.

💻 assembly Snippet

push ax  ; Decrements SP by 2
pop ax   ; Increments SP by 2

A.Instructions (e.g., PUSH, POP, CALL, RET)
B.Pointers
C.Indexes
D.Variables

Ch 02: 16-Bit Segmented Memory Model & Addressing Modes

CS401 - Computer Architecture and Assembly Language Programming Examination Practice

Mid Term Examination

Final Term Examination

CS401 - Computer Architecture and Assembly Language Programming Examination Practice

Mid Term Examination

Final Term Examination

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