Operating Systems & Software MCQs With Answers

BIOS (Basic Input/Output System) or modern UEFI (Unified Extensible Firmware Interface) executes the POST (Power-On Self-Test) and loads the OS bootloader into memory when a computer turns on.

Deadlock occurs when four conditions hold simultaneously: Mutual Exclusion, Hold and Wait, No Preemption, and Circular Wait. Starvation refers to a process waiting indefinitely due to low priority, and Thrashing occurs when high paging activity degrades performance.

Round Robin (RR) is a preemptive scheduling algorithm designed for time-sharing systems. Each process is assigned a fixed time slot called a Time Quantum. It avoids process starvation.

Virtual Memory uses demand paging to map secondary storage (swap/page file) as an extension of RAM. This enables programs larger than physical memory capacity to execute seamlessly.

The Kernel is the central core of an OS managing process lifecycle, memory, device drivers, and system calls in Kernel Mode. The Shell is the command-line or GUI user interface layer wrapping around the kernel.

The fork() system call creates a duplicate child process identical to the parent process. It returns 0 to the child and the child's PID to the parent process. exec() replaces the current process image with a new program.

chmod (change mode) modifies read/write/execute permissions (e.g., chmod 755 file.txt). chown changes file ownership, and chgrp alters group assignments.

The Loader is an OS module that reads executable program files from disk storage, allocates RAM memory space, sets up environment variables, and transfers control to the program entry point.

The Clipboard is a temporary physical memory buffer in the operating system that holds text, graphics, or files that have been cut (Ctrl+X) or copied (Ctrl+C) until they are pasted (Ctrl+V).

Pressing Shift + Delete bypasses the Recycle Bin and permanently deletes the selected file or folder immediately from the storage drive.

Task Manager (accessible via Ctrl + Shift + Esc or Ctrl + Alt + Del) provides details about computer performance, active applications, processes, network activity, and memory consumption.

An Operating System (OS) is system software that acts as an interface between the user, application software, and computer hardware. It manages hardware resources, memory, file systems, and process execution.

MS-DOS (Microsoft Disk Operating System) was Microsoft's primary non-graphical command-line operating system released in 1981 for IBM-compatible PCs. It laid the commercial foundation for Microsoft before Windows GUI environments were introduced.

PDF stands for Portable Document Format. Developed by Adobe Systems in 1992, PDF presents documents consistently across hardware, software platforms, and operating systems without altering page formatting, fonts, or image placement.

- GUI stands for Graphical User Interface.
- It lets users interact using icons and windows.
- Windows and macOS both use a GUI.

- Formatting prepares a storage device by erasing existing data.
- It sets up the device to store new data properly.
- New hard disks and USB drives are usually formatted before first use.

- A software suite is a bundle of related computer programs.
- Microsoft Office is a common example of a software suite.
- Suites often share a similar look and work well together.

- Compatibility means a program or device works correctly with a system.
- Incompatible software may not install or run properly.
- Checking requirements before installing helps avoid this issue.

- Partitioning divides one drive into separate sections.
- Each partition can be used like a separate drive.
- It is sometimes used to install more than one operating system.

- Installing sets up a new program so it can run on a computer.
- It usually involves copying files and settings to the system.
- Uninstalling removes a program that is no longer needed.

- Uninstalling removes a program from a computer.
- It frees up storage space.
- Most operating systems have a built-in tool for uninstalling programs.

- Shutdown turns a computer completely off.
- All open programs are closed in the process.
- It differs from sleep mode, which keeps some power running.

- Sleep mode is a low-power state that pauses activity.
- The computer stays partially on to resume quickly.
- It saves more energy than leaving a computer fully active.

- Hibernate saves open work to disk before turning off.
- It uses less power than sleep mode.
- Work can be resumed later without starting programs again.

- A warm boot restarts a computer that is already on.
- It is different from a cold boot, which starts from fully off.
- Restarting can fix minor software issues.

- A cold boot starts a computer from being fully off.
- It loads the operating system from scratch.
- This differs from a warm boot, which restarts an already-on computer.

- Microsoft Word is an example of application software.
- It helps users perform a specific task, like writing.
- Windows, Linux, and macOS are operating systems, not applications.

- Application software helps perform specific user tasks.
- Word processors and browsers are common examples.
- It is different from system software, which manages the computer itself.

- The operating system manages hardware and runs programs.
- Windows, macOS, and Linux are examples.
- Every computer needs an OS to function.

- System software helps manage the computer itself.
- The operating system is a type of system software.
- It works in the background to keep the computer running.

- Freeware is software that is free to use.
- It sometimes includes advertisements.
- It usually stays free without a time limit.

- Shareware is offered free on a trial basis.
- Users are asked to pay after the trial ends.
- It differs from freeware, which usually stays free.

- PDF stands for Portable Document Format.
- It keeps a document's layout the same on any device.
- PDFs are widely used for official documents.

- The .jpg extension usually indicates an image file.
- It is commonly used for photographs.
- JPEG balances quality with smaller file size.

- The .mp3 extension usually indicates an audio file.
- It is commonly used for music and podcasts.
- MP3 reduces file size while keeping reasonable sound quality.

- The .mp4 extension usually indicates a video file.
- It can hold both video and audio in one file.
- MP4 is widely supported for streaming and sharing videos.

- A backup is a copy of important data made to prevent loss.
- It can be stored on an external drive or online.
- Regular backups protect against accidental deletion.

- Compression reduces the size of a file.
- It saves storage space and speeds up transfers.
- Common compressed formats include .zip files.

- An app store is where users download mobile apps.
- Apple's App Store and Google Play are examples.
- Apps can be free or paid.

- Middleware connects and allows communication between applications.
- It works between the operating system and applications.
- It is common in large business software systems.

- Firmware is low-level software built into hardware.
- It controls a device's basic functions.
- Routers and printers commonly use firmware.

- Open-source software has publicly available source code.
- Anyone can view, modify, and share it.
- Linux is a well-known example of open-source software.

- Proprietary software keeps its source code private.
- It usually requires a purchased license to use.
- Microsoft Windows is an example of proprietary software.

- A plug-in adds specific extra features to an application.
- Browser plug-ins can add things like ad blocking.
- Not all plug-ins work with every version of an app.

- An emulator simulates a different computer system.
- It allows software made for one system to run on another.
- Game console emulators are a common example.

- A virtual machine is a virtual computer inside a real one.
- It can run its own separate operating system.
- Several virtual machines can run on one physical computer.

- Dual-boot lets a computer run more than one OS.
- The user chooses which one to start at boot time.
- It usually requires dividing the drive into separate parts.

- A hypervisor manages resources for multiple virtual machines.
- It lets several virtual systems share one physical computer.
- It is important in cloud computing and data centers.

- File conversion changes a file from one format to another.
- It is often needed for compatibility with other programs.
- Many apps offer a 'Save As' option for this.

- A file manager is used to browse and organize files.
- File Explorer in Windows is a common example.
- It helps with copying, moving, and deleting files.

- Safe Mode loads only essential drivers and services.
- It is used to troubleshoot computer problems.
- Users can access it through special startup options.

- Control Panel is used to adjust Windows settings.
- It manages things like hardware and installed programs.
- Newer Windows versions also use a Settings app.

- The desktop is the on-screen arrangement of icons and windows.
- It is the main starting point for using a computer.
- Users can customize their desktop background and icons.

- A directory, or folder, organizes related files.
- It can also contain other folders inside it.
- Good organization makes files easier to find.

- A version is a numbered update of a software program.
- It reflects new features, fixes, or improvements.
- Keeping software updated improves performance and security.

• System software provides the platform for other software to run.
• It includes operating systems, device drivers, and utility software.
• Application software performs specific user tasks.

• BIOS is firmware used to perform hardware initialization during the booting process.
• It is stored on a ROM chip on the motherboard.
• UEFI is the modern successor to BIOS.

• JPEG (Joint Photographic Experts Group) uses lossy compression to reduce file size.
• It is ideal for photos with complex colors.
• Other formats like PNG are better for graphics with transparency.

• Over time, files become 'fragmented' across the disk, slowing down reading speed.
• Defragmentation collects pieces of the same file together.
• This is only for mechanical hard drives; SSDs should not be defragmented.

• WYSIWYG editors allow users to edit content in a way that looks like the finished product.
• Common in word processors and website builders.
• It bridges the gap between raw code and visual design.

• Proprietary software has restrictive licenses and the source code is hidden.
• Users purchase a license to use it, but do not own it.
• Contrast this with Open Source software.

• Multi-threading allows a program to perform multiple tasks concurrently.
• Threads share the same memory space within a process.
• It improves the performance of modern applications.

• Vector-based design programs like Illustrator are used for logos and branding.
• Raster-based programs like Photoshop are for photos.
• Essential for creative industries.

• Booting involves the BIOS/UEFI loading the OS kernel into memory.
• 'Cold boot' is from power-off; 'Warm boot' is a restart.
• The goal is to reach a usable OS state.

• Linux is a free, open-source OS kernel.
• It powers most servers, Android devices, and supercomputers.
• Various 'distributions' (e.g., Ubuntu, Fedora) exist.

• Services (Windows) or Daemons (Linux) provide system-level functionality.
• They do not require a user interface.
• Examples: web servers, print queues, anti-virus scanners.