Basic computer operations (hardware and software)

The governing concept is application switching in an operating system. Alt+Tab commonly moves focus from one open application window to another while leaving both applications open. Ctrl+S saves the current file, Ctrl+P opens printing, and Enter usually starts a new line. Since the question asks what Alt+Tab is used for, option B is correct.

The governing concept is keyboard state control. When Caps Lock is active, alphabetic keys normally produce uppercase letters, such as A, B, and C, without holding Shift for each letter. It does not save a file, remove the cursor, or shut down the computer. The exact behavior of number and symbol keys usually remains unchanged, so option C is correct.

The governing concept is data protection through redundancy. A backup is a separate copy of a file stored on another location or device. If the original is accidentally deleted, corrupted, infected, or lost because of hardware failure, the copy can be used to restore the information. A backup does not alter the computer’s color, monitor brightness, or keyboard, so option C is correct.

The governing concept is electrical and equipment safety. The computer should be shut down and, when appropriate, unplugged before cleaning; a soft, dry, lint-free cloth can remove dust without introducing moisture. Spraying liquid on a powered device, pulling cables, or touching components with wet hands can cause short circuits, damage, or electric shock. Therefore option D is the appropriate precaution.

The governing concept is the purpose of a shortcut in an operating system. A shortcut is a small link or pointer to the original application, so double-clicking it opens the application quickly without making another full copy. Creating or deleting the shortcut normally does not install, enlarge, or remove the original program. Therefore, option A is correct; the other options confuse access links with program files or power controls.

The governing concept is the computer startup sequence. During booting, firmware begins the startup checks and the operating system is loaded from secondary storage into RAM, where it can manage hardware and run programs. Scanning searches for information, printing produces paper output, and formatting prepares a storage device by organizing or erasing data. Thus, option A correctly names the startup-loading process.

The governing concept is the difference between input and output devices. A scanner optically reads text or images on paper and converts that information into a digital file that the computer can store or process. A printer produces paper output, while a speaker produces sound and a projector displays images on a surface. Because the question asks for paper-to-digital input, option C is correct.

The governing concept is the function of window-control buttons. Minimise hides the active window from the desktop and usually places its task button on the taskbar, while the application normally remains running and can be reopened. Close ends that window or exits the application, depending on the program. Neither button permanently removes the program or shuts down the whole computer. Therefore, option D is correct.

Application software helps a user perform a particular task. A word processor is designed for creating, editing, formatting, and saving documents, so option C is correct. A motherboard, RAM, and CPU are hardware components inside or connected to a computer; they support processing and storage but are not user applications. Thus, the distractors represent hardware, whereas the word processor represents software.

The governing concept is reversal of a recent editing action. Undo cancels the latest change, so it can restore text that was accidentally deleted; in many applications, Ctrl+Z performs this command. Therefore option B is correct. Restarting or shutting down does not reverse editing, and uninstalling removes software rather than recovering document content. Saving afterward may preserve the corrected document.

The governing concept is hardware–software communication. A device driver acts as an interface that helps the operating system understand and control a particular device, such as a printer, keyboard, or graphics card. Thus option B is correct. Writing documents, playing videos, and renaming files are application or file-management tasks, not the general purpose of a driver.

The governing concept is device recognition through a compatible driver. A newly connected printer may need printer-driver software so that the operating system can identify its functions, send print jobs, and receive status information. Option C is therefore correct. A word processor creates documents, a media player handles audio or video, and a calculator performs arithmetic; none normally establishes printer communication.

The governing concept is restarting the operating system so that services, memory, and recently changed settings can load again. Restarting is often useful after software updates and may clear temporary faults or unresponsive behavior. Option A is correct. Printing requires a printer, scanning requires a scanner, and cleaning a mouse is a physical maintenance task, so options B, C, and D do not describe restarting.

The governing concept is software maintenance. Updates may repair known bugs, close security vulnerabilities, improve compatibility, and sometimes add useful features or performance improvements. Therefore option B is correct. Updating software does not enlarge the computer’s physical body, convert one hardware device into another, or normally delete every file. Those choices confuse maintenance with unrelated hardware or data actions.

The governing concept is preventive computer security. Antivirus programs use virus definitions and detection rules to recognise malicious files and behaviour. Because new malware appears frequently, regular updates add information about emerging threats; therefore, option C is correct. Updating does not change monitor size, increase printer speed, or make every file open automatically, so options A, B, and D describe unrelated effects.

The governing concept is safe handling of removable storage. A suspicious pen drive may contain malware that can run when files are opened or accessed. Scanning it with updated antivirus software before using its contents can identify threats and reduce risk, so option D is correct. Inserting it everywhere, disabling antivirus, or opening files blindly removes protective checks and makes options A, B, and C unsafe.

The governing concept is user-session security. Logging out ends the current account session, so another person using a shared computer cannot normally continue viewing or changing the first user’s open account. Therefore, option A is correct after work is finished on a shared device. Logging out is different from shutting down: it does not necessarily turn off the computer, and the other options have no connection with ending a session.

The governing concept is authentication and access control. A strong password, especially one that is difficult to guess and not reused, helps prevent unauthorised people from entering an account and viewing or changing private data. Thus, option B is correct. It does not physically protect the computer case, printer paper, or screen brightness; those are unrelated hardware conditions, so options A, C, and D are incorrect.

The governing concept is the difference between a shortcut and the original program. A shortcut is a small link or reference that points to the program’s location, commonly on the desktop or Start menu. Selecting it provides convenient, quick access, so option B is correct. It is not a complete duplicate, does not remove the program, and cannot increase RAM; therefore A, C, and D confuse a link with unrelated operations.

The governing concept is that a shortcut is a reference, not the original file. Deleting the shortcut normally removes only that link from the desktop, folder, or menu; the file or program to which it points remains in its original location. Thus, option C is correct. Deleting a shortcut does not ordinarily rename, print, or delete the target, although deleting the actual file itself would be a different action, so A, B, and D are incorrect.

The governing concept is window and task switching in an operating system. The taskbar lists or represents open applications, so clicking the required program’s button brings that window to the front without closing the others. Therefore, option D is correct. Shutting down ends the session, deleting files destroys data, and disconnecting the monitor interrupts display; none of these actions switches normally between open windows, so A, B, and C are unsuitable.

A screenshot is a captured image of the display at a particular moment. Using a keyboard shortcut or a system tool can copy the visible screen, after which the image may be saved as a file. Formatting prepares storage, booting starts or loads the operating system, and uninstalling removes software. Since none of those creates a screen image, option A is correct.

Hardware is the physical equipment, while software provides instructions that control or use it. In option B, the word processor sends a print command through the operating system and printer driver, and the physical printer produces the document. The other choices wrongly assume that hardware can act without instructions or a complete computer system. Thus, option B best demonstrates cooperation between software and hardware.

The governing concept is the effect of startup programs on system resources. When many unnecessary applications launch together, they consume RAM, processor time and sometimes disk activity before the user begins working. The computer may therefore start and respond more slowly, making option D correct. Extra programs do not increase storage, secure every file, or make a printer faster.

The governing concept is system software and the boot process. After the initial hardware startup checks, the operating system is loaded into memory so that it can manage hardware, provide the user interface and support other applications. Therefore, option A is correct. Presentation software, an image editor and a music application are user programs that normally run only after the operating system is available.