Operating System Objective Questions and Answers

This operating system quiz focuses on medium to advanced level concepts with carefully curated objective questions, correct answers, and clear explanations. Ideal for interviews and in-depth OS learning.

Practice Operating System MCQs with Detailed Explanations

Answer at least 12 questions to submit and verify answers.

1 Which CPU scheduling algorithm is optimal in terms of average waiting time but impractical to implement? Medium

2 In preemptive priority scheduling, which issue can occur if priorities are not adjusted? Medium

3 What is the main drawback of Round Robin scheduling with very small time quantum? Medium

4 Which condition is NOT required for a deadlock to occur? Medium

5 Which technique allows the operating system to recover from deadlock? Medium

6 Banker’s algorithm is primarily used for which purpose? Medium

7 Which page replacement algorithm can suffer from Belady’s anomaly? Medium

8 Which page replacement algorithm approximates the optimal algorithm? Medium

9 Thrashing occurs when: Medium

10 Which technique is used to reduce thrashing? Medium

11 Which memory management scheme eliminates external fragmentation? Medium

12 Internal fragmentation is primarily caused by: Medium

13 Which file allocation method suffers from poor random access performance? Medium

14 Which disk scheduling algorithm provides better throughput than FCFS but may cause starvation? Medium

15 Which OS structure minimizes the amount of code running in kernel mode? Medium