Operating System MCQs with Answers
Practice important Operating System MCQs with answers and explanations.
Chapter: 16
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
Correct Answer:
B
Chapter: 16
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
Correct Answer:
C
Chapter: 16
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)
Correct Answer:
A
Chapter: 16
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)
Correct Answer:
B
Chapter: 16
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
Correct Answer:
A
Chapter: 16
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
Correct Answer:
B
Chapter: 16
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
Correct Answer:
C
Chapter: 16
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)
Correct Answer:
C
Chapter: 16
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
Correct Answer:
A
Chapter: 16
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
Correct Answer:
C
Chapter: 16
Q411:
In a multilevel queue scheduling system, processes in the foreground queue typically get what kind of priority?
A. Lower priority
B. Higher priority
C. The same priority
D. No priority assigned
Correct Answer:
B
Chapter: 16
Q412:
Which of the following factors heavily influences the performance of the Round Robin scheduling algorithm?
A. Size of the ready queue
B. Size of the time quantum
C. Process priority
D. Memory usage
Correct Answer:
B
Chapter: 16
Q413:
Round Robin scheduling is most suited for which type of system?
A. Batch systems
B. Time-sharing systems
C. Embedded systems
D. Real-time systems
Correct Answer:
B
Chapter: 16
Q414:
The main disadvantage of a small time quantum in Round Robin scheduling is:
A. Higher response time
B. Higher context switch overhead
C. Larger waiting time
D. forced preemption
Correct Answer:
B
Chapter: 16
Q415:
What is the optimal time quantum size for minimizing turnaround time in Round Robin scheduling?
A. A very small time quantum
B. A very large time quantum
C. Equal to the average burst time
D. At least as large as the average burst time
Correct Answer:
C
Chapter: 16
Q416:
The average waiting time in Round Robin scheduling is typically __________ compared to SJF scheduling.
A. Higher
B. Lower
C. The same
D. Unpredictable
Correct Answer:
A
Chapter: 16
Q417:
In Multilevel Queue Scheduling, which type of process usually gets the highest priority?
A. Background processes
B. Foreground processes
C. Both processes have the same priority
D. Depends on process burst time
Correct Answer:
B
Chapter: 16
Q418:
A context switch in the Round Robin algorithm occurs when:
A. A process completes its time quantum
B. The ready queue is empty
C. A new process is added to the ready queue
D. A process enters a critical section
Correct Answer:
A
Chapter: 16
Q419:
The turnaround time for a process in Round Robin scheduling is heavily influenced by:
A. Process priority
B. Time quantum size
C. Context switch time
D. CPU burst time
Correct Answer:
B
Chapter: 16
Q420:
In Figure 16.2, as the time quantum size decreases, what happens to the number of context switches?
A. It decreases
B. It stays constant
C. It increases
D. There is no impact
Correct Answer:
C