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Unit 5 · System Software and Operating System Paper 2 CS · December 2023

Match List I with List II
List IList II
(a) LRU(I) A page is written to secondary memory only when it has been selected for replacement
(b) Demand cleaning(II) A page that has not been referenced for the longest time is replaced
(c) Long-term scheduling(III) The decision to add to the number of processes that are partially or fully in main memory
(d) Medium-term scheduling(IV) The decision to add to the pool of processes to be executed

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Correct answer: B. (a)-(II), (b)-(I), (c)-(IV), (d)-(III)

Explanation

LRU replaces the page unused for the longest time (II). Demand cleaning writes a page out only when it is selected for replacement (I). Long-term scheduling decides which processes join the pool to be executed (IV). Medium-term scheduling decides how many processes are (partly) in main memory (III).

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