Computer MCQs for Competitive Exams

A hacker is an individual who uses their technical skills to illegally access computer systems, often for malicious purposes or unauthorized information retrieval.

RAM (Random Access Memory) is volatile memory, meaning it only stores data temporarily while the computer is powered on, unlike permanent storage devices.

Malware is a broad term encompassing any software specifically designed to disrupt, damage, or gain unauthorized access to a computer system.

A firewall is a security system, either hardware or software, that monitors and controls network traffic to prevent unauthorized access to a computer.

Mainframe computers are powerful, large-scale machines primarily used by large organizations for critical applications and bulk data processing.

NOS stands for Network Operating System, which is specialized software designed to manage network resources and facilitate communication between connected devices.

A hyperlink is a clickable element on a webpage that directs the user to another document, section, or resource when activated.

A programming language is a formal set of instructions and rules used to tell a computer what operations to perform, enabling software development.

The memory unit is an essential component of the Central Processing Unit (CPU), responsible for storing data and instructions for quick access.

Serial access memories are most useful in applications where data is inherently processed or stored sequentially, flowing in and out serially.

Debugging is the essential process of identifying, analyzing, and fixing or bypassing errors within computer program code to ensure proper operation.

BIOS is an acronym for Basic Input Output System, which is firmware used to perform hardware initialization during the booting process.

Sorting is the process of arranging data elements into a specific order or sequence, such as alphabetical or numerical, for better organization.

RAM functions as a "waiting room" for the computer's processor, temporarily holding data and instructions ready for immediate access and processing.

Thomas J. Watson Sr. is recognized as the founder of IBM, having built the company into a global technology and consulting corporation.

A keyboard or mouse is an input device, which allows users to feed data and commands into a computer system for processing.

In Microsoft Word, a document can be saved using "Save," "Save As," or through the quick access toolbar, providing three distinct methods.

The correct answer is submenu because a submenu acts as a secondary, branching level within a hierarchical user interface menu system to display specialized options related to a primary selection.

• submenu: This is the correct choice. Your original default answer key listed 'dialog box', which is a factual error. In classic graphical user interfaces, when a user expands a primary option from the main menu bar (such as 'File' or 'Edit'), a drop-down list appears. Choosing an entry marked with a secondary arrow opens a 'submenu', presenting an additional, clustered set of related parameters or commands.
• Incorrect Options:
  • dialog box: This is incorrect. A dialog box is an independent, standalone pop-up window that prompts users to input parameter values, choose specific settings, or view system confirmation notifications before a program can proceed. It is not an integrated extension of the main menu list itself.
  • menu selection: This is incorrect. This is a general descriptive term for the act of clicking an option rather than a distinct interface element or structural command group.

MS-Access is a relational database management system (RDBMS) designed for creating, managing, and manipulating databases, making it a database program.

In MS Excel, the "Data" tab contains the "Remove Duplicates" feature, which is specifically used to delete duplicate values from a selected range.

E-mail is an abbreviation for "Electronic mail," which is a widely used method for exchanging digital messages over the internet.

The "Alt + Tab" shortcut key combination is universally used in Windows operating systems to quickly switch between different open application windows.

Computers perform fundamental operations including arithmetic calculations, logical comparisons, data storage, and input/output processing to function effectively.

The Central Processing Unit (CPU) primarily consists of the Arithmetic Logic Unit (ALU) for calculations and the Control Unit (CU) for managing operations.

Charles Babbage (C) is recognized as the "Father of the Computer" for conceiving the Analytical Engine, which established the foundational principles of modern digital computers. Leibnitz (A) and Blaise Pascal (B) contributed to earlier mechanical calculators, but not the programmable computer concept.