Ch 04: Bit Manipulation and Shifts

Covers bitwise logic manipulations, clearing/setting/toggling specific bits, arithmetic vs logical shifts, fast multiplication and division algorithms by powers of 2, and extended-precision math.

198 Questions198 MCQs0 Short Questions0 Long Questions

🎯 Exam Practice Papers

CS401 - Computer Architecture and Assembly Language Programming Examination Practice

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

Showing 21 – 30 of 198 Questions

Page 3 of 20

Q21

❓ MCQ📘 CS401📑 Lec 4🏷️ 4.2. Multiplication and Division InstructionsEasy🔁⭐💡📄🎓VU🏛️VU

For the execution of the instruction `DIV BL`, in which register is the implied dividend stored?

💻 assembly Snippet

DIV BL

A.AX
B.BX
C.CX
D.DX

Q22

❓ MCQ📘 CS401📑 Lec 4🏷️ 4.1. Shift and Rotate Instructions (RCR and RCL)Easy🔁⭐💡📄🎓VU🏛️VU

In a Rotate Through Carry Right (RCR) instruction executed on a 16-bit word operand, the rotation effectively operates across a total ring of how many bits?

💻 assembly Snippet

RCR AX, 1

A.17 bits rotation
B.16 bits rotation
C.1 bit rotation
D.8 bits rotation

Q23

❓ MCQ📘 CS401📑 Lec 4🏷️ 4.1. Shift Instructions and Bitwise ArithmeticEasy🔁⭐💡📄🎓VU🏛️VU

Suppose the decimal number 35 is shifted right by one bit position using a logical right shift instruction (`SHR`). What will be the resulting decimal value?

💻 assembly Snippet

MOV AL, 35
SHR AL, 1

A.17
B.35
C.70
D.140

Q24

❓ MCQ📘 CS401📑 Lec 4🏷️ 4.2. Shifting and RotationsEasy⭐💡📄🎓VU🏛️VU

If register D contains decimal 35, what is the new value after performing a bitwise logical shift left by 2 bits (`35 << 2`)?

💻 assembly Snippet

mov ax, 35
shl ax, 2 ; AX = 35 * 4 = 140

A.35
B.70
C.140
D.17

Q25

📝 Short Q📘 CS401📑 Lec 4🏷️ 4.5. Bitwise Logical OperationsMedium⭐💡📄🎓VU🏛️VU

Explain the purpose, mechanics, and usage of the `TEST` instruction in x86 assembly language.

💻 assembly Snippet

test ax, 0x0001 ; Tests if Bit 0 is set without changing AX

Q26

❓ MCQ📘 CS401📑 Lec 4🏷️ 4.1. Addressing Modes (Immediate Label vs Memory Contents Addressing)Easy🔁⭐💡📄🎓VU🏛️VU

If variable `Num1` is located at memory offset address `0x0117` and stores the data value `0x0005`, what value will register `BX` contain after executing `mov bx, Num1` in NASM assembly?

💻 assembly Snippet

mov bx, Num1   ; BX = 0x0117 (immediate address offset)
mov bx, [Num1] ; BX = 0x0005 (memory contents)

A.0005
B.0117
C.Num1
D.1701

Q27

📝 Short Q📘 CS401📑 Lec 4🏷️ 4.1. Assembly Syntax Errors (Size Mismatch and Directives)Medium⭐💡📄🎓VU🏛️VU

Explain common assembly language program syntax and semantic errors, such as 'Size Mismatch Error', and how to correct them.

💻 assembly Snippet

mov ax, bl       ; ERROR: Size mismatch (16-bit vs 8-bit)
mov byte [bx], 5 ; CORRECT: Explicit size directive

Q28

❓ MCQ📘 CS401📑 Lec 4🏷️ 4.1. Assembly Syntax Errors (Size Mismatch Syntax Error)Easy🔁⭐💡📄🎓VU🏛️VU

True or False: A 'Size Mismatch Error' in assembly language programming is classified as a compile-time syntax error.

A.False
B.True

Q29

❓ MCQ📘 CS401📑 Lec 4🏷️ 4.1. Segmented Memory Model (CS:IP Default Pairing)Easy🔁⭐💡📄🎓VU🏛️VU

By default, the Code Segment register (CS) is implicitly paired with which register to form full instruction addresses (CS:IP)?

A.SS
B.BP
C.CX
D.IP

Q30

❓ MCQ📘 CS401📑 Lec 4🏷️ 4.1. Addressing Modes (Memory-to-Memory Limitation)Easy🔁⭐💡📄🎓VU🏛️VU

True or False: In x86 assembly language architecture, direct memory-to-memory operations (such as `mov [mem1], [mem2]`) are directly supported in a single instruction.

💻 assembly Snippet

; ILLEGAL: mov [mem1], [mem2]
; LEGAL:
mov ax, [mem2]
mov [mem1], ax

A.True
B.False

Ch 04: Bit Manipulation and Shifts

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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