📑 CHAPTER PRACTICE

CS401 - Computer Architecture and Assembly Language Programming – Subroutines

Practice 10 verified multiple choice questions per batch with instant answer reveal and comprehensive solutions.

Showing 31 – 40 of 222 Questions

Page 4 of 23

Q31📝 Short Q📑 Lec 5Medium⭐High-Yield💡Conceptual

Discuss the relationship between the subroutine instructions `CALL` and `RET` regarding whether they operate as hardware-dependent or independent operations.

💻 assembly Snippet

call my_subroutine ; Pushes IP and jumps
;
my_subroutine:
    ret ; Pops return address into IP

Q32❓ MCQ📑 Lec 5Easy🔁Repeated⭐High-Yield💡Conceptual

True or False: Executing the instruction `PUSH` increments the Stack Pointer (`SP`) by two before transferring a word to the top of the stack.

💻 assembly Snippet

push ax ; Decrements SP by 2, writes AX to [SS:SP]

A.True
B.False

Q33❓ MCQ📑 Lec 5Easy🔁Repeated⭐High-Yield💡Conceptual

__________ is also a stack memory base pointer register containing the address of arguments and local variables inside the stack segment.

💻 assembly Snippet

mov ax, [bp + 4] ; Accesses parameter passed on stack via BP

A.SP
B.BP
C.PB
D.AC

Q34❓ MCQ📑 Lec 5Easy🔁Repeated⭐High-Yield💡Conceptual

The Stack Pointer register (SP) is a memory pointer that is used implicitly/indirectly by a specific set of __________ (such as `PUSH`, `POP`, `CALL`, and `RET`).

💻 assembly Snippet

push ax ; SP modified implicitly by PUSH instruction
pop  bx ; SP modified implicitly by POP instruction

A.instructions
B.Pointers
C.Indexes
D.Variables

Q35❓ MCQ📑 Lec 5Easy🔁Repeated⭐High-Yield💡Conceptual

The Stack Pointer (SP) is a specialized memory pointer register that implicitly points to the __________.

💻 assembly Snippet

push ax ; Decrements SP by 2, pointing to new top of stack

A.Top of the stack
B.Bottom of the stack
C.Base of the stack frame
D.Start of code segment

Q36❓ MCQ📑 Lec 5Easy🔁Repeated⭐High-Yield💡Conceptual

The `CALL` instruction takes a target memory label as an __________ and begins execution from that target location.

💻 assembly Snippet

call print_string ; 'print_string' label acts as argument

A.argument
B.Label
C.Text
D.Register

Q37❓ MCQ📑 Lec 5Easy🔁Repeated⭐High-Yield💡Conceptual

The __________ instruction allows temporary control flow diversion to a subroutine, enabling code reusability.

💻 assembly Snippet

call my_subroutine ; Temporarily diverts control flow to subroutine

A.CALL
B.RET
C.AND
D.XOR

Q38❓ MCQ📑 Lec 5Easy🔁Repeated⭐High-Yield💡Conceptual

In standard stack frame creation, executing `push bp` performs which action?

💻 assembly Snippet

push bp     ; Pushes old BP onto stack
mov  bp, sp ; Sets up new stack frame pointer

A.sending bp copy to stack
B.making bp copy from stack
C.pushing bp on the stack
D.doing nothing

Q39❓ MCQ📑 Lec 5Easy🔁Repeated⭐High-Yield💡Conceptual

When parameters are passed to a subroutine on the stack, the straightforward method to retrieve them inside the subroutine is to __________ them off the stack.

💻 assembly Snippet

pop ax ; Retrieves top parameter off the stack into AX

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

Q40❓ MCQ📑 Lec 5Easy🔁Repeated⭐High-Yield💡Conceptual

To preserve register values across subroutine calls, the standard technique is to use __________ and __________ operations to save caller registers on the stack and restore them before returning.

💻 assembly Snippet

subroutine:
    push ax ; Save AX
    push bx ; Save BX
    ; ... subroutine work ...
    pop  bx ; Restore BX
    pop  ax ; Restore AX
    ret

A.POP, ADC
B.CALL, RET
C.CALL, RET n
D.PUSH, POP

CS401 - Computer Architecture and Assembly Language Programming – Subroutines

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