CS401 - Computer Architecture and Assembly Language Programming: Branching MCQs with Answers & Solutions

Q1📝 Short Q📑 Lec 3Easy🔁Repeated⭐High-Yield💡Conceptual

When multiplying two 8-bit numbers in x86 assembly language, how many bits will the resulting product contain?

💻 assembly Snippet

mov al, 0xFF
mov bl, 0x02
mul bl

Q2🧠 Long Problem📑 Lec 3Medium🔁Repeated⭐High-Yield💡Conceptual

Write the algorithm for the Bubble Sort sorting technique in your own words.

💻 assembly Snippet

mainloop:
    mov si, 0
    mov byte [swap], 0
innerloop:
    mov ax, [bx+si]
    cmp ax, [bx+si+2]
    jbe noswap
    xchg ax, [bx+si+2]
    mov [bx+si], ax
    mov byte [swap], 1

Q3📝 Short Q📑 Lec 3Easy🔁Repeated⭐High-Yield💡Conceptual

Provide valid x86 assembly instruction(s) to divide the unsigned value in the AX register by 8.

💻 assembly Snippet

mov cl, 3
shr ax, cl

Q4📝 Short Q📑 Lec 3Medium🔁Repeated⭐High-Yield💡Conceptual

Calculate the new values of registers AX and DX after executing the instruction 'DIV BX' when DX = 0x0000, AX = 0x0007, and BX = 0x0002, or state if an overflow occurs.

💻 assembly Snippet

mov dx, 0x0000
mov ax, 0x0007
mov bx, 0x0002
div bx

Q5📝 Short Q📑 Lec 3Medium🔁Repeated⭐High-Yield💡Conceptual

Calculate the new values of registers AX and DX after executing the instruction 'DIV BX' when DX = 0x0000, AX = 0xFFFF, and BX = 0x0010, or state if an overflow occurs.

💻 assembly Snippet

mov dx, 0x0000
mov ax, 0xFFFF
mov bx, 0x0010
div bx

Q6📝 Short Q📑 Lec 3Hard🔁Repeated⭐High-Yield💡Conceptual

Calculate the new values of registers AX and DX after executing the instruction 'IDIV BX' when DX = 0xFFFF, AX = 0xFFFC, and BX = 0x0003, or state if an overflow occurs.

💻 assembly Snippet

mov dx, 0xFFFF
mov ax, 0xFFFC
mov bx, 0x0003
idiv bx

Q7📝 Short Q📑 Lec 3Hard🔁Repeated⭐High-Yield💡Conceptual

Calculate the new values of registers AX and DX after executing the instruction 'DIV BX' when DX = 0xFFFF, AX = 0xFFFC, and BX = 0x0003, or state if an overflow occurs.

💻 assembly Snippet

mov dx, 0xFFFF
mov ax, 0xFFFC
mov bx, 0x0003
div bx

Q8📝 Short Q📑 Lec 3Easy🔁Repeated⭐High-Yield💡Conceptual

The MOVZX (Move with Zero-Extend) instruction is strictly used with ________ integers.

💻 assembly Snippet

mov bl, 0x85
movzx cx, bl

Q9📝 Short Q📑 Lec 3Medium🔁Repeated⭐High-Yield💡Conceptual

Consider the following code segment: mov bl, 0x9B movsx cx, bl What is the resulting 16-bit hexadecimal value stored in the CX register?

💻 assembly Snippet

mov bl, 0x9B
movsx cx, bl

Q10📝 Short Q📑 Lec 3Easy🔁Repeated⭐High-Yield💡Conceptual

Which flag in the FLAGS register is NOT affected by the execution of INC and DEC instructions?

💻 assembly Snippet

stc
inc ax

Branching

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