Q1. Operating System is:

A) Application Software
B) System Software
C) Utility Software
D) Programming Language

Answer: B

Explanation: An Operating System is system software that acts as an interface between the user and computer hardware.

Q2. The main function of an Operating System is:

A) Compile programs
B) Manage computer hardware and software resources
C) Create websites
D) Design databases

Answer: B

Explanation: The OS manages CPU, memory, files, input/output devices, and software resources.

Q3. Which of the following is not a type of Operating System?

A) Batch OS
B) Real-Time OS
C) Compiler OS
D) Distributed OS

Answer: C

Explanation: Compiler is a translator software, not a type of Operating System.

Q4. Which OS allows multiple users to work at the same time?

A) Single User OS
B) Multiuser OS
C) Batch OS
D) Embedded OS

Answer: B

Explanation: A Multiuser OS allows many users to use the same system simultaneously.

Q5. Which Operating System is commonly used in ATM machines?

A) Batch OS
B) Real-Time OS
C) Distributed OS
D) Network OS

Answer: B

Explanation: ATM machines require quick and accurate responses, so Real-Time OS is used.

Q6. Which generation introduced Operating Systems?

A) First Generation
B) Second Generation
C) Third Generation
D) Fourth Generation

Answer: C

Explanation: Proper operating systems were introduced in the third generation of computers.

Q7. UNIX is an example of:

A) Single-user OS
B) Multi-user OS
C) Mobile OS
D) Embedded OS

Answer: B

Explanation: UNIX is a powerful multi-user and multitasking operating system.

Q8. Which of the following is an example of system software?

A) MS Word
B) Photoshop
C) Windows
D) Chrome

Answer: C

Explanation: Windows is an Operating System, so it is system software.

Q9. Which of the following is not an OS service?

A) File management
B) Memory management
C) Web designing
D) Process management

Answer: C

Explanation: Web designing is an application-level task, not an OS service.

Q10. System calls are used for:

A) Communication between user and kernel
B) Playing games
C) Internet browsing
D) Virus scanning

Answer: A

Explanation: System calls allow user programs to request services from the kernel.

Q11. Which mode is used to execute system calls?

A) User Mode
B) Kernel Mode
C) Safe Mode
D) Normal Mode

Answer: B

Explanation: System calls are executed in Kernel Mode because they require privileged access to hardware and system resources.

Q12. The heart of the Operating System is:

A) Shell
B) Kernel
C) CPU
D) RAM

Answer: B

Explanation: Kernel is the core part of the Operating System that manages system operations like memory, CPU, and devices.

Q13. Which OS structure has all services in one large kernel?

A) Microkernel
B) Layered
C) Monolithic
D) Virtual Machine

Answer: C

Explanation: In Monolithic architecture, all OS services run together inside one large kernel.

Q14. Which OS structure provides better security and modularity?

A) Monolithic
B) Microkernel
C) Batch
D) DOS

Answer: B

Explanation: Microkernel keeps only essential functions in the kernel, improving security and modularity.

Q15. Layered OS structure divides OS into:

A) Threads
B) Layers
C) Processes
D) Files

Answer: B

Explanation: In Layered structure, the OS is divided into different layers, each performing specific functions.

Q16. Which of the following is an example of a Microkernel OS?

A) Windows
B) Linux
C) Mach
D) DOS

Answer: C

Explanation: Mach is a famous example of Microkernel architecture.

Q17. Virtual Machine provides:

A) Real hardware
B) Simulated environment
C) Antivirus
D) File system

Answer: B

Explanation: A Virtual Machine creates a virtual or simulated computer environment.

Q18. Hypervisor is related to:

A) File system
B) Virtual Machine
C) CPU scheduling
D) Deadlock

Answer: B

Explanation: Hypervisor is software used to create and manage Virtual Machines.

Q19. Which command interpreter is used in UNIX?

A) Kernel
B) Shell
C) BIOS
D) Loader

Answer: B

Explanation: Shell is the command interpreter in UNIX that accepts and executes user commands.

Q20. Windows OS is developed by:

A) Apple
B) IBM
C) Microsoft
D) Intel

Answer: C

Explanation: Windows Operating System is developed by Microsoft.

Q21. CLI stands for:

A) Common Line Interface
B) Command Line Interface
C) Control Line Interface
D) Code Line Interface

Answer: B

Explanation: CLI stands for Command Line Interface, where users interact with the system by typing text commands.

Q22. GUI stands for:

A) General User Interface
B) Graphical User Interface
C) Graphic Utility Interface
D) Global User Interface

Answer: B

Explanation: GUI stands for Graphical User Interface, where users interact using icons, buttons, windows, and menus.

Q23. Which of the following is an example of GUI OS?

A) DOS
B) UNIX Command Line
C) Windows
D) Shell Script

Answer: C

Explanation: Windows is a GUI-based Operating System because it provides a graphical environment for users.

Q24. DOS is an example of:

A) GUI
B) CLI
C) Real-Time OS
D) Distributed OS

Answer: B

Explanation: DOS uses text-based commands, so it is a Command Line Interface (CLI) operating system.

Q25. Which of the following is not a system call type?

A) Process Control
B) File Management
C) Communication
D) Video Editing

Answer: D

Explanation: Video editing is an application task, not a type of system call.

Q26. The interface between user and hardware is:

A) Compiler
B) Operating System
C) Database
D) Browser

Answer: B

Explanation: The Operating System acts as a bridge between the user and the computer hardware.

Q27. Bootstrap program is stored in:

A) RAM
B) ROM
C) Cache
D) Hard Disk

Answer: B

Explanation: The bootstrap program is stored in ROM because it is needed during system startup.

Q28. Which of the following loads the OS into memory?

A) Compiler
B) Loader
C) Bootstrap Program
D) Assembler

Answer: C

Explanation: The bootstrap program loads the Operating System into memory when the computer starts.

Q29. Which Operating System is used in smartphones?

A) Android
B) Linux
C) UNIX
D) DOS

Answer: A

Explanation: Android is a mobile Operating System specially designed for smartphones and tablets.

Q30. Linux is mainly known as:

A) Proprietary OS
B) Open Source OS
C) Database
D) Programming Language

Answer: B

Explanation: Linux is an open-source Operating System, meaning its source code is freely available.