List-I (Algorithm / Term) A. FIFO B. Optimal (OPT) C. LRU D. Thrashing List-II (Operational Phenomenon) Suffers from Belady's Anomaly (faults rise as frames rise). Replaces the page that will not be used for the longest time. Replaces the page that has remained untouched for the longest time. Massive page swap activity causing high CPU utilization drop.

A-1, B-2, C-3, D-4 Explanation: A. FIFO (First-In, First-Out) 1 : FIFO is subject to Belady's Anomaly , a phenomenon where increasing the number of allocated page frames results in an increase (rather than a decrease) in page faults for certain reference strings. B. Optimal (OPT) 2 : Replaces the page that will not be used for the longest time in the future . It produces the lowest page-fault rate among all algorithms but requires future knowledge of page requests. C. LRU (Least Recently Used) 3 : Replaces the page that has not been referenced for the longest period in the past (untouched for the longest time). D. Thrashing 4 : Occurs when a system spends more time swapping pages in and out of memory than executing processes, leading to a drastic drop in CPU utilization . Therefore, the correct mapping is A-1, B-2, C-3,

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CUET PG 2026 — operating system os PYQ

CUET PG | operating system os | 2026

List-I (Algorithm / Term)

A. FIFO

B. Optimal (OPT)

C. LRU

D. Thrashing

List-II (Operational Phenomenon)

Suffers from Belady's Anomaly (faults rise as frames rise).

Replaces the page that will not be used for the longest time.

Replaces the page that has remained untouched for the longest time.

Massive page swap activity causing high CPU utilization drop.

Choose the correct answer: