GATE CS 2026 Set 2 — Question 23

MCQ+1 / -0.33EasyFCFS & SJFProcess SchedulingOperating System

Operating System → Process Scheduling → FCFS & SJF

Last updated 5 September 2026

Question

Which one of the following CPU scheduling algorithms cannot be preemptive?

Correct answer (B) First Come First Serve (FCFS) Scheduling Solution First Come First Serve (FCFS) scheduling is inherently non-preemptive. Once a process is assigned to the CPU, it runs until it completes or performs an I/O operation. SRTF is the preemptive version of SJF. Round Robin is inherently preemptive (based on time quantum). Priority Scheduling can be either preemptive or non-preemptive. Turn this into a strength. Explore AI-powered practice and doubt support with Success Tracker.

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Correct answer (B) First Come First Serve (FCFS) Scheduling Solution First Come First Serve (FCFS) scheduling is inherently non-preemptive. Once a process is assigned to the CPU, it runs until it completes or performs an I/O operation. SRTF is the preemptive version of SJF. Round Robin is inherently preemptive (based on time quantum). Priority Scheduling can be either preemptive or non-preemptive.

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