Computer Operator & IT — Past Papers — Part 4 MCQs with Explanations

USB stands for Universal Serial Bus . It allows communication and data transfer between a computer and peripheral devices . Common USB devices include mouse, keyboard, printer, scanner, and external hard drive .

The Motherboard is the main circuit board of a computer. It holds or provides connections for the CPU, RAM, ROM, and expansion cards . It allows different computer components to communicate with each other . Additional information : CPU → Processes instructions RAM → Temporary memory ROM → Stores permanent/basic instructions Expansion cards → Add extra functions to a computer

Email stands for Electronic Mail . It is a method of sending and receiving digital messages through the internet. The term electronic mail has been used with its modern meaning since 1975 . The shorter form E-mail became common around 1979 . Additional information : Parts of a valid email address : Email Prefix Email Domain Address: example@mail.com example = Email Prefix mail.com = Email Domain

A keyboard is an input device. Mainly used to ente r text, numbers, and commands . Contain s alphabetic, numeric, and function keys. Common shortcut keys include Ctrl, Alt, Shift, and Enter.

Alt + Shift + F1 / Shift + F11 → Insert a new worksheet Additional information : Shift + F10 → Open shortcut/context menu Ctrl + Page Up → Previous worksheet Ctrl + Page Down → Next worksheet

MS-DOS: Microsoft Disk Operating System Developed by: Microsoft Designed for: x86-based personal computers Interface: Command-line interface (CLI) IBM version : IBM PC DOS DOS: A term also used for MS-DOS-compatible operating systems.

Definition: Uses 2 or more CPUs. Benefit : Faster processing. Main Memory: Processors usually share RAM. Purpose: Handles multiple tasks efficiently. Additional information: Uniprocessor: One processor Multithreaded: Multiple threads Multiprogramming: Multiple programs in memory

Third Generation (1965–1971): Integrated Circuits (ICs) A small semiconductor chip, usually made of silicon. Contains many tiny electronic components, including transistors/MOSFETs. Additional information: First Generation (1946–1959): Vacuum tubes Second Generation (1959–1965): Transistors Third Generation (1965–1971): Integrated Circuits (ICs) Fourth Generation (1972–1980): VLSI and microprocessors

BCC stands for: Blind Carbon Copy Used in: Email communication Purpose: Hides recipient email addresses from other recipients Additional information : CC (Carbon Copy): Recipients are visible to all BCC: Recipients are hidden from everyone except the sender

A Graphics Card is installed in an expansion slot such as PCI/PCI Express . It improves graphics rendering and gaming performance. Modern dedicated graphics cards commonly use PCI Express (PCIe) slots.

CAD stands for Computer-Aided Design . It is used to create, modify, and analyze designs using computers. CAD is commonly used in engineering, architecture, and manufacturing .

HDMI stands for High-Definition Multimedia Interface . It transmits high-quality digital audio and video through a single cable. It is commonly used to connect computers, TVs, monitors , projectors, and gaming consoles.

Ctrl + L → Left Align Additional information : Ctrl + E → Center Align Ctrl + R → Right Align Ctrl + J → Justify

The F4 key is commonly used to repeat the last action in programs like Microsoft Word and Excel. For example, if you format text or perform a specific actio n, pressing F4 will repeat it. Last updated question by NA on 07 May 2026

Ctrl + Shift + @ → Time format Additional information : Ctrl + Shift + # → Date format Ctrl + Shift + $ → Currency format Ctrl + Shift + % → Percentage format

Ctrl + M → Increase Left Indent Additional information : Ctrl + Shift + M → Decrease Left Indent Ctrl + N → New Document Ctrl + W → Close Document

In MS Word, the shortcut key Ctrl + Right Arrow moves the cursor one word to the right. Additional information : Ctrl + Left Arrow moves the cursor one word to the left. Ctrl + Up Arrow moves the cursor one paragraph up. Ctrl + Down Arrow moves the cursor one paragraph down.

Athlon processors typically operated in the range of 1333 MHz to 2.33 GHz . 1333 MHz = 1.333 GHz . The speed refers to the processor’s clock frequency . Additional information : 1 GHz = 1000 MHz. Processor speed is commonly measured in MHz or GHz . Athlon is a processor family developed by AMD (Advanced Micro Devices).

Initial speed range: 1.3–2.0 GHz Processor: Intel Pentium 4 Architecture: NetBurst Introduction: November 2000

Data transmission means sending and receiving data through a transmission medium. It allows information to move from one device to another . Transmission media can be wired or wireless. Wired : Twisted-pair cable, coaxial cable, fiber-optic cable. Wireless : Radio waves, microwaves, infrared, and satellite communication.

Inventor: Tim Berners-Lee Collaborator: Robert Cailliau Year of invention: 1989 August Organization: CERN (European physics lab, Switzerland) First website: 1991 (public release) WWWW stands for World-Wide Web Worm.

The Office Button was introduced in Microsoft Office 2007 . It was located at the upper-left corner of the Word window. It provided commands such as New, Open, Save, Print, and Close .

A network is a group of two or more computers connected together. It allows computers to share information and resources . Resources may include files, printers, applications , and internet connections . Additional information : Router : A device that directs data between networks. Server : A computer that provides services or resources to other computers. Pipeline : A mechanism for processing or transferring data.

A communication channel is created to facilitate the transmission of information. It provides a medium through which a message travels from sender to receiver. Examples include telephone, email, radio, and internet .

Visuals make technical information easier to understand. They help readers understand complex ideas quickly. Examples include diagrams, charts, graphs, tables, and illustrations .

Monitor, Printer, and Headphones are all output devices. Output devices present or produce information from a computer for the user. Additional information : Monitor : Displays text, images, and videos. Printer : Produces information on paper. Headphones : Produce audio or sound output.

F5 key is used to refresh or reload a web page. It updates the page to show the latest content. Commonly used in browsers like Google Chrome and Mozilla Firefox . Additional information : Ctrl + R → Refresh page Ctrl + Shift + R → Hard refresh (clear cache) F11 → Full screen mode Ctrl + T → Open new tab Ctrl + W → Close current tab

IP stands for Internet Protocol . It is a set of rules used to address and route data between devices on a network . Every device on an IP network can be identified using an IP address . Additional information : IPv4 : Uses 32-bit addresses. IPv6 : Uses 128-bit addresses. Example of IPv4: 192.168.1.1

Bit stands for Binary Digit . A bit is the smallest unit of data in a computer. Represents 0 or 1 ( off / on state) 8 bits = 1 byte Used in all digital systems and computer memory.

Ctrl + Shift + L → Apply bullet points. Additional information : Ctrl + S → Save the document. Ctrl + A → Select all. Ctrl + B → Bold text. Ctrl + I → Italic text.

SMTP is the standard protocol used to send emails across the internet. SMTP stands for Simple Mail Transfer Protocol .

A Cell is the intersection of a row and a column in a spreadsheet such as MS Excel. Each cell has a unique cell address , such as A1, B5, or C10. Rows are identified by numbers : 1, 2, 3, ... Columns are identified by letters : A, B, C, ... A cell can contain text, numbers, formulas, or functions .

Ctrl + X → Cut (remove selected text) Additional information : Ctrl + R → Align text to the right Ctrl + E → Center align text Ctrl + J → Justify paragraph Ctrl + L → Align text to the left Ctrl + Q → Remove paragraph formatting ( reset to default left alignment )

In full-duplex transmission, data flows in both directions simultaneously . Both devices can send and receive data at the same time. A common example is a telephone call . Additional information : Simplex : One direction only. Half-duplex : Both directions, but not at the same time.

A1 and B1 are cell references . A cell reference identifies a specific cell in a worksheet. In =A1+B1 , Excel adds the values stored in cells A1 and B1 .

PowerPoint slides contain areas called placeholders . Placeholders are used to hold text, pictures, charts, tables , and other content. Additional information : Title placeholder : Used for slide headings. Content placeholder : Used for text and other objects.

A cell address is also called a cell reference. It identifies a specific cell in a spreadsheet. It is written using a column letter and row number .

A presentation outline helps organize the main ideas of a presentation. It arranges information in a logical sequence . It helps the presenter maintain a clear structure and avoid unnecessary information .

An operating system manages computer hardware and software resources . It uses hardware efficiently and provides services to applications. It allows programs to run smoothly and interact with hardware . It acts as an interface between users , applications , and hardware .

Ctrl + K → Insert Hyperlink Additional information : Ctrl + P → Print Ctrl + F2 → Print Preview Ctrl + H → Replace dialog box Ctrl + D → Font dialog box