GATE CS 2020 Set 1 — Question 22

MCQ+1 / -0.33EasyProcess States & PCBProcesses & ThreadsOperating System

Operating System → Processes & Threads → Process States & PCB

Last updated 5 September 2026

Question

Consider the following statements about process state transitions for a system using preemptive scheduling. I. A running process can move to ready state. II. A ready process can move to running state. III. A blocked process can move to running state. IV. A blocked process can move to ready state. Which of the above statements are TRUE?

Correct answer (C) I, II, and IV only Solution I. TRUE: In preemptive scheduling, a running process can be interrupted (e.g., time quantum expiry) and moved back to the Ready state. II. TRUE: The scheduler dispatches a process from the Ready state to the Running state. III. FALSE: A blocked process must first move to the Ready state when the event it was waiting for occurs. It cannot go directly to Running. IV. TRUE: When the I/O or event completes, a Blocked process moves to the Ready state. Therefore, statements I, II, and IV are true. Turn this into a strength. Explore AI-powered practice and doubt support with Success Tracker.

Review answer and solution without JavaScript

Interactive answer checking needs JavaScript. The published solution is available below.

Correct answer (C) I, II, and IV only Solution I. TRUE: In preemptive scheduling, a running process can be interrupted (e.g., time quantum expiry) and moved back to the Ready state. II. TRUE: The scheduler dispatches a process from the Ready state to the Running state. III. FALSE: A blocked process must first move to the Ready state when the event it was waiting for occurs. It cannot go directly to Running. IV. TRUE: When the I/O or event completes, a Blocked process moves to the Ready state. Therefore, statements I, II, and IV are true.

Continue learning with Success Tracker

Use Success Tracker to ask about the reasoning, then try another GATE CS question to check your understanding.

AI-powered practice· Unlimited practice on eligible plans

PYQs with solutions: Attempt available previous-year questions, then compare your reasoning with the worked solution. Coverage varies by stream.
Practice that adapts: Choose a topic, work on weaker areas and bookmark questions to revisit. Your attempts feed your progress tracking.
AI doubt support: Ask follow-up questions about a step or concept while practising, instead of stopping at the final answer.

Unlimited practice is available on eligible plans. Free practice and AI usage have limits; check the current plan allowances before choosing.

This page stays readable without an account. AI responses can be wrong; check them against the solution and source material.