4.1.1.15 Stack frames in subroutine calls Quiz: AQA Computer Science, Unit 1

The 20 questions

1. What memory structure stores execution data for a single subroutine call?

   • Heap block
   • Vector array
   • Stack pointer
   • Stack frame

2. Which item is stored in a stack frame alongside local variables and parameters?

   • Global variables
   • Heap pointers
   • Machine code
   • Return address

3. Why is a return address saved in a stack frame during a subroutine call?

   • To pass arguments
   • To store globals
   • To resume execution
   • To allocate heap

4. Which operation adds a new stack frame when a subroutine is called?

   • Dequeue
   • Pop
   • Peek
   • Push

5. What happens to a subroutine's stack frame when execution finishes?

   • It is popped
   • It is expanded
   • It is duplicated
   • It is saved

6. A main program calls A, and A calls B. How many frames are on the stack while B is executing, including the main program's frame?

   • 1
   • 4
   • 2
   • 3

7. A recursive subroutine is called once from the main program. It then calls itself 4 more times before reaching its base case, with no other calls. How many stack frames exist at the deepest point, counting the main program?

   • 5
   • 7
   • 6
   • 4

8. Where are parameter values stored while a subroutine executes?

   • In global memory
   • In heap space
   • In stack frame
   • On hard disk

9. Which memory access order makes a stack suitable for nested subroutine calls?

   • First-in, first-out
   • Random access
   • Direct access
   • Last-in, first-out

10. Which structure automatically reclaims local variable memory when a subroutine ends?

    • Heap manager
    • Garbage collector
    • Operating system
    • Call stack

11. What is stored in a stack frame alongside local variables and parameters?

    • Return address
    • Source code
    • Global variable
    • Heap pointer

12. Main calls subroutine P, which calls subroutine Q. Which stack frame is popped first?

    • All simultaneously
    • Frame for Main
    • Frame for Q
    • Frame for P

13. What structure stores return addresses, parameters, and local variables for subroutine calls?

    • Queue
    • Call stack
    • Hash table
    • Binary tree

14. What error occurs when a recursive subroutine calls itself indefinitely?

    • Syntax error
    • Division by zero
    • Stack overflow
    • Type error

15. A subroutine has three local variables and two parameters. How many values does its stack frame hold for those items alone?

    • 3
    • 6
    • 2
    • 5

16. Which register typically tracks the current top of the subroutine call stack?

    • Stack pointer
    • Base register
    • Program counter
    • Accumulator

17. Where are local variables stored during a subroutine call?

    • Stack frame
    • Global memory
    • Hard drive
    • Disk storage

18. Which value in a stack frame indicates where execution should continue after a subroutine ends?

    • Local variable
    • Return address
    • Passed parameter
    • Frame pointer

19. A stack has frames for main, A and B. B returns. How many frames remain on the stack?

    • 3
    • 1
    • 0
    • 2

20. What directly causes a stack overflow error during execution?

    • Excessive call depth
    • Syntax error
    • Missing output
    • Unused variables

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