Match List - I with List - II. Choose the correct answer from the options given below :List - I (operating system concepts) List - II (characteristics) (A) Paging (I) Evicts least recently used process (B) LRU (Least Recently Used) (II) Extends physical memory (C) C-SCAN (III) Logical to physical mapping (D) Virtual Memory (IV) Circular disk access
(A)-(III), (B)-(I), (C)-(IV), (D)-(II)
The items are four standard operating-system mechanisms for memory and disk management.
(A) Paging — the logical address space is divided into pages and a page table maps each page to a physical frame, i.e. logical to physical mapping: (A)-(III).
(B) LRU (Least Recently Used) — a replacement policy that evicts the page (the item that has gone unused longest) that was least recently used: (B)-(I).
(C) C-SCAN — the disk head services requests in one direction only and then jumps back to the start, treating the cylinders as a circular list: (C)-(IV).
(D) Virtual Memory — uses secondary storage to give processes an address space larger than RAM, so it extends physical memory: (D)-(II).
Codes that call LRU circular disk access or paging an eviction policy mismatch these mechanisms, so the other three codes fail.
(A)-(III), (B)-(I), (C)-(IV), (D)-(II) option is correct.
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