Computer Science

The smallest unit of memory or data in a computer is a bit, which represents a binary value of 0 or 1. Bytes and megabytes are larger units composed of multiple bits.

A program written in a high-level language is called source code because it is the original code written by a programmer before being translated into machine code. Assembly programs and machine programs refer to lower-level representations, not high-level language code.

Internet Explorer is a web browser used primarily for viewing web pages on the internet, making option C the correct answer.

ENIAC (Electronic Numerical Integrator and Computer) was the first general-purpose electronic digital computer, completed in 1945. IBM and Apple are companies, not specific early computers, and 'None of these' is incorrect.

ENIAC (Electronic Numerical Integrator and Computer) was the first general-purpose electronic digital computer, completed in 1945. It is widely recognized as the first electronic computer, making option A correct.

Tim Berners-Lee, along with Robert Cailliau, invented the World Wide Web. He is widely recognized as the primary inventor of the WWW, making option B correct.

ASCII stands for American Standard Code for Information Interchange, which is a character encoding standard for electronic communication. The other options are incorrect expansions of the acronym.

The '@' symbol is used in email addresses to separate the local part (username) from the domain part, effectively dividing the email into two parts.

The font size tool in many word processors, including MS Word, can be accessed using the shortcut Ctrl + Shift + P, which opens the font size dialog box. Ctrl + S is the shortcut for saving a document, so option C is incorrect.

CSS stands for Cascading Style Sheets, which is the correct and widely accepted expansion used in web development to describe the style sheet language.