Hello students in this page provide you 20 MCQ based on the operating system which help many exam like Semester and another exam like Banking, Railway, ISRO,DRDO etc.
Multiple Choice Questions on Operating System Set-1
Q.1 What is the primary function of an operating system?
Word processing
Process and Memory Management
Calculation
None of these
Explanation
The operating system manages the computer’s resources, specifically handling process scheduling and memory allocation.
Q.2 What is the full form of DOS?
Disk operating system
Disk orientation system
Disk original System
None of these
Explanation
DOS stands for Disk Operating System, a type of operating system that runs from a disk drive.
Q.3 Which of the following is an example of an operating system?
MS Word
MS-DOS
MS EXCEL
None of these
Explanation
MS-DOS (Microsoft Disk Operating System) is a command-line operating system used in early PCs.
Q.4 A file is a collection of?
Data
Information
Both A & B
None of these
Explanation
A file is a container in a computer system for storing information or data.
Q.5 Which of the following is classified as system software?
Utilities
Compiler
Operating system
All of these
Explanation
System software includes the operating system and all utility programs that manage and direct the computer’s resources.
Q.6 An operating system maintains the page table for?
Each address
Each process
Instruction
None of these
Explanation
The OS uses page tables to manage virtual memory addresses and map them to physical memory.
Q.7 Semaphores are primarily used for solving which problem?
Process management
Priority
Synchronization
None of these
Explanation
A semaphore is a variable or abstract data type used to control access to a common resource by multiple processes in a concurrent system.
Q.8 What does the acronym SJF stand for?
Shortest Job Fit
Shortest Job Fire
Shortest Job First
None of these
Explanation
Shortest Job First (SJF) is a scheduling policy that selects the waiting process with the smallest execution time to execute next.
Q.9 Which of the following is a characteristic supported by Linux?
More than one file
Less than one file
One
None of these
Explanation
Linux is a multi-user and multi-tasking system that supports a complex file system and concurrent processes.
Q.10 The Banker's algorithm is specifically used for?
Deadlock removal
Deadlock avoidance
Both A & B
None of these
Explanation
The Banker’s algorithm is a resource allocation and deadlock avoidance algorithm that tests for safety by simulating the allocation for predetermined maximum possible amounts.
Q.11 How many bytes are in 1 Megabyte (MB)?
2^20 bytes
3^20 bytes
1024 bytes
None of these
Explanation
In computing, 1 MB is traditionally defined as 1,048,576 bytes (
2
20
2
20
).
Q.12 1 Terabyte (TB) is equal to?
1024 MB
512 GB
1024 GB
None of these
Explanation
According to standard data measurement, 1024 Gigabytes (GB) make up 1 Terabyte (TB).
Q.13 In terms of licensing, Linux is considered?
Open source
Closed source
Copyright
None of these
Explanation
Linux is open-source software, meaning its source code is available for anyone to view, modify, and distribute.
Q.14 In terms of licensing, early UNIX versions are typically considered?
Open source
Closed source
Copyright
None of these
Explanation
Standard original UNIX versions are proprietary software protected by copyright laws.
Q.15 What are the possible values of a Binary Semaphore?
2, 1
0, 2
0, 1
None of these
Explanation
A binary semaphore can have only two values: 0 and 1, used to provide mutual exclusion.
Q.16 Running multiple programs at the same time is known as?
Batch OS
Multitasking
Real time
None of these
Explanation
Multitasking is the concurrent execution of multiple tasks (also known as processes) over a certain period of time.
Q.17 What is the definition of Multiprogramming?
More than one program running on CPU
More than one program loaded into main memory
Both
None of these
Explanation
Multiprogramming increases CPU utilization by organizing jobs so that the CPU always has one to execute, with multiple jobs kept in main memory.
Q.18 In certain memory management schemes, 'Process size = partition size' is a valid condition.
True
False
Both
None of these
Explanation
In fixed partitioning, each process is loaded into a partition of the same or larger size.
Q.19 The wastage of memory in a computer system is called?
Fragmentation
External fragmentation
Internal fragmentation
None of these
Explanation
Fragmentation is a phenomenon in which storage space is used inefficiently, reducing capacity or performance.
Q.20 In process scheduling, WT (Waiting Time) is calculated as?
WT = TAT – CT
TAT – BT
TAT – AT
None of these
Explanation
Waiting Time is the difference between Turnaround Time (TAT) and Burst Time (BT).