Operating Systems MCQs | STS IBA FPSC BPSC SPSC PPSC Mcqs Test Preparation
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What is the primary disadvantage of the ‘Shortest Job Next’ (SJN) scheduling algorithm?
A. It can lead to starvation of longer processes
B. It requires complex prediction of process execution times
C. It causes excessive context switches
D. It only works for batch processing systems
Answer: It can lead to starvation of longer processes
Which page replacement algorithm uses the ‘reference bit’ to approximate LRU?
A. Clock Algorithm
B. FIFO
C. Optimal Page Replacement
D. Least Recently Used
Answer: Clock Algorithm
What is the main objective of the ‘LRU’ (Least Recently Used) page replacement algorithm?
A. To replace the page that has not been used for the longest time
B. To replace the oldest page
C. To replace the most frequently used page
D. To replace the page with the lowest priority
Answer: To replace the page that has not been used for the longest time
What is a ‘device driver’?
A. Software that controls a specific hardware device
B. An interface between the kernel and user programs
C. Software that allocates memory to processes
D. A hardware abstraction layer
Answer: Software that controls a specific hardware device
What is the main disadvantage of using the ‘First-Come-First-Served’ (FCFS) scheduling algorithm?
A. It can lead to the 'convoy effect,' causing longer jobs to delay shorter jobs
B. It requires complex data structures to manage
C. It causes high CPU utilization
D. It can only be used for I/O-bound processes
Answer: It can lead to the 'convoy effect,' causing longer jobs to delay shorter jobs
In UNIX, what is the purpose of the ‘kill’ command?
A. To terminate a process
B. To start a process
C. To suspend a process
D. To change process priority
Answer: To terminate a process
Which of the following is true about ‘demand paging’?
A. Pages are loaded into memory only when they are needed
B. All pages of a process are loaded into memory at once
C. It eliminates the need for virtual memory
D. It reduces the size of the page table
Answer: Pages are loaded into memory only when they are needed
What is the primary purpose of ‘paging’ in operating systems?
A. To allow processes to run even when memory is limited
B. To reduce external fragmentation
C. To increase I/O throughput
D. To prevent deadlock
Answer: To reduce external fragmentation
What is ‘thrashing’ in the context of virtual memory?
A. Excessive paging activity causing system slowdowns
B. Overutilization of CPU resources
C. Fragmentation caused by dynamic memory allocation
D. CPU-bound processes slowing down the system
Answer: Excessive paging activity causing system slowdowns