Computer Science

IBM introduced the IBM Personal Computer (IBM PC) in 1981, which became widely recognized as the first computer designed for home and personal use by a major company.

1 GB (gigabyte) is equal to 1,000,000,000 bytes (1 billion bytes) in the decimal system, which is commonly used for storage devices. Therefore, 5 GB is 5 billion bytes.

ACL stands for Access Control List, which is used in computer systems and networking to define permissions for users or processes. It specifies which users or system processes are granted access to objects, as well as what operations are allowed.

CSS stands for 'Cascading Style Sheets.' None of the provided options correctly state the full form. Option B only says 'Cascading,' which is incomplete. The correct full form is 'Cascading Style Sheets,' so the options should be corrected to reflect this. Since none of the options are fully correct, the best correction is to update the options and correct answer accordingly.

The abacus is considered the earliest known calculating device, used for basic arithmetic operations such as addition, subtraction, multiplication, and division. It is a manual tool and represents the beginning of computational devices in human history.

BCD stands for 'Binary Coded Decimal,' which is a class of binary encodings of decimal numbers where each decimal digit is represented by a fixed number of binary digits, usually four or eight.

ALU stands for Arithmetic Logic Unit, which is a digital circuit used to perform arithmetic and logic operations in computers.

1 KB (Kilobyte) is equal to 1024 bytes. This is a standard unit of digital information storage in computing, where 1 KB = 1024 bytes.

The word 'virus' is derived from Latin, where it originally meant 'poison' or 'slimy liquid.' It is not originally an English or Greek word.

CRT stands for 'Cathode Ray Tube,' which is a technology used in traditional computer monitors and television screens. The other options are incorrect expansions of the acronym.