Operating Systems MCQs | STS IBA FPSC BPSC SPSC PPSC Mcqs Test Preparation
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What is ‘context switching’?
A. The process of saving and restoring the state of a CPU so that execution can be resumed from the same point at a later time
B. The mechanism used by the CPU to switch from user mode to kernel mode
C. The process of swapping out pages from memory to disk
D. A technique to reduce CPU idle time
Answer: The process of saving and restoring the state of a CPU so that execution can be resumed from the same point at a later time
Which of the following memory management schemes may cause ‘external fragmentation’?
A. Segmentation
B. Paging
C. Demand Paging
D. Virtual Memory
Answer: Segmentation
What is the difference between ‘hard real-time’ and ‘soft real-time’ systems?
A. Hard real-time systems guarantee meeting deadlines, while soft real-time systems aim to meet deadlines without guarantees
B. Soft real-time systems are used for embedded systems, while hard real-time systems are used for general-purpose computing
C. Hard real-time systems require multiple CPUs, while soft real-time systems do not
D. Soft real-time systems can only handle CPU-bound tasks
Answer: Hard real-time systems guarantee meeting deadlines, while soft real-time systems aim to meet deadlines without guarantees
What is the main advantage of the ‘Round Robin’ scheduling algorithm?
A. It provides fairness by giving each process an equal share of CPU time
B. It ensures that the shortest jobs are executed first
C. It minimizes context switching overhead
D. It eliminates deadlock
Answer: It provides fairness by giving each process an equal share of CPU time
What is the primary goal of the ‘multiprogramming’ concept in operating systems?
A. Maximizing CPU utilization
B. Minimizing memory usage
C. Reducing the number of I/O operations
D. Simplifying process management
Answer: Maximizing CPU utilization
Which of the following best describes ‘segmentation’?
A. Dividing a program into variable-sized sections, each corresponding to a logical unit of the program
B. Breaking memory into fixed-size blocks for processes
C. Swapping processes between memory and disk
D. Allocating CPU time in time-sharing systems
Answer: Dividing a program into variable-sized sections, each corresponding to a logical unit of the program
What does ‘page fault’ refer to in a virtual memory system?
A. A page that is not currently in memory but needed for execution
B. A page that has been corrupted
C. A fault in the paging algorithm
D. A hardware error in the page table
Answer: A page that is not currently in memory but needed for execution
What is ‘internal fragmentation’?
A. Wasted memory within allocated partitions
B. Memory wasted due to small file sizes
C. Memory wasted due to page faults
D. External memory fragmentation due to non-contiguous allocation
Answer: Wasted memory within allocated partitions
Which of the following is an advantage of ‘multithreading’ in operating systems?
A. Faster context switching
B. Increased CPU utilization by running multiple threads
C. Improved memory management
D. Better disk scheduling
Answer: Increased CPU utilization by running multiple threads