Operating Systems MCQs | STS IBA FPSC BPSC SPSC PPSC Mcqs Test Preparation
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What does ‘I/O-bound process’ refer to in operating systems?
A. A process that spends more time doing input-output than computations
B. A process that spends more time in computation
C. A process that frequently switches between devices
D. A process that does not use any I/O devices
Answer: A process that spends more time doing input-output than computations
Which algorithm is used to manage access to the critical section in ‘Dekker’s algorithm’?
A. Mutual exclusion
B. Round-robin
C. Spinlock
D. Semaphore
Answer: Mutual exclusion
Which of the following is not a method of inter-process communication?
A. Shared memory
B. Message passing
C. Pipes
D. Spinlocks
Answer: Spinlocks
In a two-level paging system, how many page tables are used?
A. Two
B. One
C. Four
D. Unlimited
Answer: Two
Which of the following is not a requirement for the occurrence of a deadlock?
A. Preemption
B. Circular wait
C. Mutual exclusion
D. Hold and wait
Answer: Preemption
What is the role of the ‘dispatcher’ in an operating system?
A. Loads processes into the ready queue
B. Selects the next process to execute
C. Handles system calls
D. Allocates memory for processes
Answer: Selects the next process to execute
Which of the following is a characteristic of the ‘multilevel feedback queue’ scheduling algorithm?
A. Allows processes to move between queues
B. Assigns all processes to a single queue
C. Processes stay in their initial queue
D. Always executes shortest job first
Answer: Allows processes to move between queues
Which of the following best defines ‘virtual memory’?
A. A memory management technique that gives an application the impression it has contiguous working memory
B. A way to physically increase the size of RAM
C. A method to improve disk performance
D. A process used to delete files
Answer: A memory management technique that gives an application the impression it has contiguous working memory
What is the key purpose of the ‘fork()’ system call in UNIX?
A. Creates a new process
B. Allocates memory
C. Manages I/O devices
D. Synchronizes processes
Answer: Creates a new process