Operating System MCQs with Answers
Practice important Operating System MCQs with answers and explanations.
Multiple Choice Questions
Q401: The performance of the round-robin scheduling algorithm depends primarily on the size of what?
- A: The ready queue
- B: The time quantum
- C: The process burst time
- D: The CPU speed
View Answer
B
Q402: What happens if the time quantum in Round Robin scheduling is set too small?
- A: The number of context switches will decrease
- B: The overhead will decrease
- C: The number of context switches will increase
- D: The CPU efficiency will improve
View Answer
C
Q403: In a round-robin scheduling system, if there are n processes in the ready queue, what is the maximum time a process must wait before getting its next quantum?
- A: (n-1)*(q+tcs)
- B: (n-1)*q
- C: (q+tcs)*n
- D: n*(q+tcs)
View Answer
A
Q404: Which scheduling algorithm is better suited for batch systems?
- A: Round Robin (RR)
- B: Shortest Job First (SJF)
- C: First Come First Serve (FCFS)
- D: Longest Job First (LJF)
View Answer
B
Q405: If the time quantum in a round-robin scheduling system is infinite, what behavior does it mimic?
- A: First Come First Serve (FCFS)
- B: SJF (Shortest Job First)
- C: LJF (Longest Job First)
- D: Multilevel Queue Scheduling
View Answer
A
Q406: In the figure representing Round Robin scheduling (quantum = 20), what does the Gantt chart illustrate?
- A: The order in which processes are executed based on burst times
- B: The execution sequence of processes with a time quantum
- C: The priority of processes in the ready queue
- D: The number of context switches during execution
View Answer
B
Q407: What is the primary advantage of the Shortest Job First (SJF) algorithm over Round Robin scheduling?
- A: Less CPU time consumption
- B: Better response times
- C: Lower waiting time for short processes
- D: Preemptive nature of scheduling
View Answer
C
Q408: A process with a longer CPU burst will likely face a higher waiting time in which scheduling algorithm?
- A: Shortest Job First (SJF)
- B: Round Robin (RR)
- C: First Come First Serve (FCFS)
- D: Longest Job First (LJF)
View Answer
C
Q409: The average turnaround time for a process under Round Robin scheduling is generally _______ compared to SJF.
- A: Higher
- B: Lower
- C: The same
- D: Unpredictable
View Answer
A
Q410: Which of the following is true about Multilevel Queue Scheduling?
- A: All processes are scheduled by the same algorithm
- B: Foreground processes may have a lower priority than background processes
- C: Processes are classified into queues based on properties like priority and type
- D: Each queue gets the same portion of CPU time
View Answer
C