A-LevelComputer ScienceSystem software9618/31 · May/June 2021 · Q39 Marks

Draw one line to connect each Operating System (OS) term to the most appropriate description about it. OS term Multi-tasking Paging Interrupt handling Scheduling Virtual memory Description Using secondary storage to simulate additional main memory Managing the processes running on the CPU Managing the execution of many programs that appear to run at the same time Locating non-contiguous blocks of data and relocating them Transferring control to another routine when a service is required Reading/writing same-size blocks of data from/to secondary storage when required

(a)Draw one line to connect each Operating System (OS) term to the most appropriate description about it. OS term Multi-tasking Paging Interrupt handling Scheduling Virtual memory Description Using secondary storage to simulate additional main memory Managing the processes running on the CPU Managing the execution of many programs that appear to run at the same time Locating non-contiguous blocks of data and relocating them Transferring control to another routine when a service is required Reading/writing same-size blocks of data from/to secondary storage when required[5]
(b)Explain how an interpreter executes a program without producing a complete translated version of it.[4]

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Mark scheme

Marking points from the official mark scheme (May/June 2021). The mark or mark type is shown in brackets.

[1] (a) Multi-tasking -> Managing the execution of many programs that appear to run at the same time
[1] (a) Paging -> Locating non-contiguous blocks of data and relocating them
[1] (a) Interrupt handling -> Transferring control to another routine when a service is required
[1] (a) Scheduling -> Managing the processes running on the CPU
[1] (a) Virtual memory -> Using secondary storage to simulate additional main memory
[1] (b) An interpreter examines source code one statement at a time
[1] (b) Check each statement for errors
[1] (b) If no error is found the statement is executed
[1] (b) If an error is found this is reported and the interpreter halts
[1] (b) Interpretation is repeated for every iteration in repeated sections of code/in loops
[1] (b) Interpretation has to be repeated every time the program is run

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