Operating Systems MCQs | STS IBA FPSC BPSC SPSC PPSC Mcqs Test Preparation
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Which of the following algorithms is used in real-time operating systems to meet strict deadline requirements?
A. Rate-monotonic scheduling
B. Round Robin
C. First-Come, First-Served
D. Shortest Job First
Answer: Rate-monotonic scheduling
Which is not a type of kernel mode operation?
A. User-level execution
B. I/O management
C. Process management
D. Memory management
Answer: User-level execution
What does ‘thrashing’ refer to in memory management?
A. A condition where excessive paging occurs, reducing performance
B. Allocating more memory than a process requires
C. Switching between multiple processes rapidly
D. Exhausting all available system memory
Answer: A condition where excessive paging occurs, reducing performance
What is the main goal of the ‘working set’ model in virtual memory?
A. Reduce page faults by keeping frequently used pages in memory
B. Ensure that processes do not starve
C. Balance CPU load across all processes
D. Prevent deadlock by limiting resource use
Answer: Reduce page faults by keeping frequently used pages in memory
Which of the following is used to implement the ‘Copy-on-Write’ (COW) strategy in operating systems?
A. Virtual memory
B. Process scheduling
C. File systems
D. Deadlock prevention
Answer: Virtual memory
What is the major drawback of the ‘shortest job next’ scheduling algorithm?
A. Leads to starvation of long processes
B. Requires large memory allocation
C. Causes low CPU utilization
D. Results in more context switches
Answer: Leads to starvation of long processes
Which of the following is a characteristic of the ‘elevator’ (SCAN) disk scheduling algorithm?
A. Serves requests in a specific direction until no more requests are left
B. Always serves the shortest request first
C. Uses a round-robin method for serving requests
D. Does not take the direction of disk movement into account
Answer: Serves requests in a specific direction until no more requests are left
Which of the following is a drawback of using a spinlock for process synchronization?
A. Wastes CPU cycles
B. Requires extra memory allocation
C. Cannot prevent race conditions
D. Leads to deadlocks
Answer: Wastes CPU cycles
What is the main difference between a ‘microkernel’ and a ‘monolithic kernel’?
A. Microkernels have minimal functionality in kernel space
B. Monolithic kernels provide multitasking support
C. Microkernels support more device drivers
D. Monolithic kernels can be upgraded without rebooting
Answer: Microkernels have minimal functionality in kernel space