Computer Operator & IT — Past Papers — Part 2 MCQs with Explanations

Hybrid computer processes both analog and digital signals. It combines the features of analog and digital computers. Used in medical equipment, scientific research, and industrial systems.

Ctrl + D → Opens Font Dialog Box. Ctrl + F12 → Opens the Open Document dialog box. Ctrl + H → Opens the Replace dialog box.

DVI stands for Digital Visual Interface. It is a video display interface. Used to connect a computer to a monitor/display. It can transmit digital video signals.

Machine language is the basic language directly understood by the computer's CPU. It uses binary digits (0 and 1). The basic components are instructions and data. Instructions tell the CPU what operation to perform .

First computer program: Ada Lovelace’s algorithm (1843) for Charles Babbage’s Analytical Engine . First widely used high-level programming language: FORTRAN (1957). Machine Language: The earliest machine-level programming language, using binary 0s and 1 s.

Spam = Unsolicited Commercial Email (UCE). Sent without the recipient’s request or permission. Usually sent to many people at once. Often contains advertisements, promotions, or offers.

The BMP file format, also known as a bitmap image file Developed by: Microsoft Corporation Initial release: December 1987 Type of format: Raster graphics

A Client Operating System is designed for personal computers and end users. It is used for daily tasks like browsing, gaming, and office work . Windows 10 is a popular client OS by Microsoft. It runs on desktops and laptops .

YAHOO stands for: Yet Another Hierarchical Officious Oracle. Founded: January 1994; 32 years ago Headquarters: Sunnyvale, California, United States Owners Apollo Global Management (90%) Verizon (10%) Founders Jerry Yang David Filo

IMEI stands for International Mobile Equipment Identity IMEI = unique 15-digit number Used to i dentify mobile devices Helps track or block lost/stolen phones Works globally fo r all mobile networks Last updated by NS on 06 May 2026

Ctrl + H is used for Find and Replace function . It allows users to search text and replace it quickly. Additional information : Ctrl + F → Find text Ctrl + C → Copy Ctrl + V → Paste Ctrl + X → Cut Ctrl + Z → Undo

PrtScn captures a picture of the screen. The screenshot is copied to the clipboard. It can then be pasted using Ctrl + V. **

Kernel/Filter scans the input image. Performs convolution to detect features. Identifies patterns like edges, shapes, and textures. Produces a feature map.

PDA: Personal Digital Assistant Type: Handheld computer Uses: Contacts, calendar, notes Input: Touchscreen and stylus Purpose: Managing personal information

The basic components of a machine language program are: Instructions: Tell the computer what operations to perform. Data: The information on which the instructions operate. Machine language uses binary digits (0s and 1s). It is directly understood by the CPU .

Data entered through the keyboard is temporarily stored in RAM . RAM holds data and programs currently being used . It is a volatile memory. Data in RAM is lost when the computer is turned off.

" Presentation View " is not a PowerPoint view. Common PowerPoint views include: Normal view Slide Sorter view Outline view Slide Show view

Coded entries used to gain access to a computer system are called passwords . Definition: A secret string of letters , numbers , or symbols . Purpose: User verification and account security .

A strong password should contain a combination of letters, numbers and special characters . Alphabetic characters: A–Z, a–z Numeric characters: 0–9 Special characters: @, #, $, %, ! Strong password: Long, unique, and difficult to guess.

CC stands for Carbon Copy . It is used to send a copy of an email to additional recipients. All recipients can see the email addresses listed in the To and Cc fields. Additional information : Bcc (Blind Carbon Copy) → Sends a hidden copy; other recipients cannot see these addresses.

Flash memory is a type of EEPROM that can be electrically erased and reprogrammed in blocks. It is non-volatile memory, meaning it retains data even when power is turned off . It is widely used in USB drives, SSDs , and memory cards .

A pixel (picture element) is the smallest addressable element of a digital image or display screen . A screen is made up of millions of pixels arranged in rows and columns. Additional information : Byte : A unit of digital data, normally 8 bits. Bit : The smallest unit of digital data, represented as 0 or 1.

Bill Gates is the co-founder of Microsoft , along with Paul Allen in 1975 . He is an American businessman, software developer, and philanthropist. He belongs to the United States of America (USA). He was conferred the Hilal-e-Pakistan on February 17, 2022 , for his services in public health and philanthropy .

Cell borders in MS Excel are used to separate and define individual cells or ranges of cells . Borders make worksheets clearer , organized , and easier to read. Borders can be applied to the top, bottom, left, right, or all sides of a cell or selected range.

An Operating System (OS) is system software . It manages computer hardware and provides a platform for running application software . It acts as an interface between the user and computer hardware . Functions of an Operating System : Allocates resources Monitors activities Manages disks and files

Common uses: Documents, letters, assignments, reports, resumes Developer: Microsoft Type: Word processor / application software First released: 25 October 1983 Original name: Multi-Tool Word First platform: Xenix

Ctrl + S = To save a document. Additional information : Ctrl + X → Cut (remove selected text) 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 )

A computer mouse is a handheld hardware input device . It is used to control the cursor in a GUI (Graphical User Interface). It helps in pointing, moving, and selecting items on a computer.

COMPUTER stands for Commonly Operated Machine Particularly Used for Technical Education and Research First electronic general-purpose computer: ENIAC Developed: 1945–1946 Output devices: Monitor, Printer, Speaker, Projector Input devices: Keyboard, Mouse, Scanner, Microphone Father of the computer: Charles Babbage

Graphics inserted into a word processor are typically called clip art or inline images. Clip Art: Ready-made graphics or illustrations. Inline Image: Picture inserted within the text. Example: MS Word allows users to insert pictures, icons, and shapes.

In MS Excel Ctrl+9 shortcut key is used for hiding rows. Additional information: Ctrl+0 (zero) to Hide Columns. Ctrl+Shift+( to Unhide Rows. Ctrl+Shift+) to Unhide Columns Ctrl + N New Workbook Ctrl + O Open Workbook Ctrl + S Save Workbook Ctrl + P Print Ctrl + K Insert Hyperlink Ctrl + ; Insert Current Date Ctrl + Shift + ; Insert Current Time Last updated NA on 10-09-2026

Ctrl + R runs the Fill Right command Additional information Ctrl + D: Fill Down SUM(): Adds/total values in a range COUNT(): Counts cells containing numbers MOD(): Returns the remainder after division

Ctrl + D: Fill Down Ctrl + R: Fill Right Additional information SUM(): Adds/total values in a range COUNT(): Counts cells containing numbers MOD(): Returns the remainder after division

Borders can be applied to: Cells: Used in MS Excel to outline or separate data. Paragraphs: Used in MS Word to frame blocks of text. Text: Can be applied to selected text or lines.

To highlight a column, Ctrl+Space is used. Additional information: Shift + Space is used for row. Help in MS Excel: F1 Display active cells in Excel: Shift+Backspace Current date in Excel: Ctrl+; GO TO tab in Ms. Excel: F5 Column highlight: CTRL + space SUM formula in MS Excel: ALT + = New worksheet in Excel: Shift + F11 Format numbers in comma format: Shift+1 Last updated NA on 10-09-2026

Transistors were the core technology used in second-generation computers. The University of Manchester's experimental Transistor Computer was first operational in November 1953 Additional information: The five generations of computers: First Generation (1946-1959 or 1940-1956): Vacuum tube-based technology (e.g., ENIAC). Second Generation (1959-1965 or 1956-1963): Transistor-based technology. Third Generation (1965-1971 or 1964-1971): Integrated circuit -based technology. Fourth Generation (1972-1980): VLSI microprocessor-based technology. Fifth Generation (1980-present): ULSI microprocessor-based technology, with a focus on artificial intelligence.

Cache Memory is the fastest memory. It is typically located inside or very close to the CPU . Additional information : L1 Cache : Usually the fastest and smallest CPU cache. L2 Cache : Larger than L1 but generally slower. L3 Cache : Larger and usually shared among CPU cores.

ROM (Read Only Memory) is a non-volatile storage device. It stores data permanently even without power. Additional information : RAM (Random Access Memory) is a volatile storage device. It loses data when power is off .

Charles Babbage is known as the Father of the Compute r . He designed the more advanced Analytical Engine , which featured a " Mill " (CPU) and a " Store " (memory). Additional information : He was an English polymath . Born : 26 December 1791 London, England Died : 18 October 1871 (aged 79) London, England Last updated on 09-03- 2026

Headers and footers are visible in Page Layout View and Print Layout View . They appear at the top and bottom of a page . They can contain page numbers, dates, document titles , and other information. Additional information : Page Layout View : Shows how the page will appear when printed, including headers and footers. Print Layout View : Displays the document with its page structure, including headers and footers.