Operating Systems MCQs | STS IBA FPSC BPSC SPSC PPSC Mcqs Test Preparation

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Which of the following is not a characteristic of ‘real-time operating systems’?

A. Time constraints on task execution
B. Low response times
C. No context switching
D. Guaranteed worst-case execution time

Answer: No context switching

Which of the following is a ‘preemptive’ scheduling algorithm?

A. Round Robin
B. First-Come, First-Served
C. Shortest Job Next
D. FCFS

Answer: Round Robin

Which of the following is a key feature of ‘distributed systems’?

A. Geographically separated nodes collaborate on a task
B. Multiple processes share the same memory space
C. All nodes run the same operating system
D. There is no network involved

Answer: Geographically separated nodes collaborate on a task

What does ‘multiprogramming’ aim to achieve in an operating system?

A. Maximize CPU utilization
B. Increase memory efficiency
C. Minimize response time
D. Improve security

Answer: Maximize CPU utilization

What is the key role of the ‘swapper’ process in an operating system?

A. Swaps entire processes in and out of memory
B. Manages memory allocation for processes
C. Allocates CPU time to processes
D. Handles process creation and termination

Answer: Swaps entire processes in and out of memory

Which disk scheduling algorithm ensures ‘fair’ access by all processes?

A. Round Robin
B. FCFS (First Come, First Served)
C. SSTF (Shortest Seek Time First)
D. SCAN

Answer: FCFS (First Come, First Served)

Which of the following is a disadvantage of using the ‘paging’ method in memory management?

A. Internal fragmentation
B. External fragmentation
C. I/O overhead
D. Increased CPU utilization

Answer: Internal fragmentation

Which of the following is not a valid state for a process?

A. New
B. Ready
C. Executing
D. Blocked

Answer: Executing

What is the main disadvantage of the ‘priority scheduling’ algorithm?

A. Leads to starvation
B. Requires more memory
C. Causes deadlock
D. Increases context switching

Answer: Leads to starvation