Computer Science

Microsoft Word files typically use the .docx extension, which is the default format for Word documents since Word 2007. This format supports advanced features and formatting compared to older formats like .doc or plain text files.

UNIX was originally developed by scientists and engineers at Bell Labs to provide a powerful, flexible operating system for scientific and engineering tasks, making it the correct answer.

The Windows Registry is indeed a hierarchical database that stores low-level settings for the operating system and for applications that opt to use the registry. This makes option B the correct answer.

The shortcut key for Justify Align in most text editing software like Microsoft Word is Ctrl + J, which aligns the selected text evenly along both the left and right margins.

The shortcut key Ctrl + Spacebar is used to clear all character-level formatting in the selected text, reverting it to the default style. This is a standard shortcut in many word processing applications like Microsoft Word.

G-mail is a popular email service provided by Google, and its full form is 'Google Mail'. This is the official and widely accepted expansion of the term.

A firewall is a security device or software that monitors and controls incoming and outgoing network traffic based on predetermined security rules, primarily to protect against unauthorized access and threats.

Pre-released software typically goes through an Alpha phase first, which is an early testing stage before Beta. Beta versions come after Alpha and are more stable but still not final. Therefore, the correct answer for the version of pre-released software is Alpha, not Beta.

Rendering in video editing refers to the process of generating the final video output by processing all edits, effects, and transitions. It is typically the final step in video production before the video can be viewed or exported.

Pressing and holding the left mouse button while moving the mouse is called dragging. This action allows you to move objects or select multiple items on the screen.

The feature that allows you to reverse or take a step backward after making a mistake is called 'Undo'. It reverts the last action performed, making it the correct choice.

Supercomputers are designed to perform a limited number of tasks extremely quickly, focusing on high-speed computation for complex calculations. Mainframes, on the other hand, prioritize handling many tasks simultaneously, supporting numerous users and applications concurrently.

The term used when a clip art image changes the direction of faces is 'Flip,' which mirrors the image horizontally or vertically. 'Rotate' changes the orientation by turning the image around a point, but does not specifically change the direction of faces as flipping does.

A programmed chip is commonly referred to as a PROM (Programmable Read-Only Memory), which can be programmed once after manufacturing. ROM is a broader category that includes PROM but is not specifically the 'programmed chip' itself.

Headers and footers are inserted in documents to display information such as page numbers, titles, or dates consistently at the top or bottom of each page, especially when printed. This allows important information to appear on every page automatically.

Passwords are the most common and widely used tool to restrict access to computer systems by verifying user identity before granting access.

A cache is a memory buffer that stores frequently accessed data to bridge the speed gap between the fast CPU and slower main memory, effectively accommodating speed differentials.

A dedicated computer is designed to perform one specific task or function, unlike general-purpose computers that can run multiple types of software and tasks. Therefore, option B correctly defines a dedicated computer.

The shortcut key Ctrl + F12 is commonly used to open the Open dialog box in many software applications, such as Microsoft Word. This allows users to quickly access files to open without navigating menus.

A spybot is a type of malicious software designed to gather user information and send it to a third party over the Internet. The other options do not specifically describe this behavior: a virus is a broader term for malware, a logic bomb triggers under certain conditions, and a security patch is a software update to fix vulnerabilities.

The shortcut key to increase the font size of the selected text in many text editing programs is Ctrl + Shift + >. This combination increases the font size stepwise.

ROM (Read-Only Memory) is both static and non-volatile, meaning it retains data without power and does not require refreshing like RAM. RAM is volatile, BIOS is firmware stored in ROM, and cache is volatile memory used for speed.

A standard two-sided, single-layer DVD has a capacity of about 8.5 GB to 8.8 GB. The option closest to this standard capacity is 8.8 GB (Option A). Other options exceed typical DVD capacities.

In Microsoft Word, inserting wallpaper (commonly referred to as a background or watermark) is used to add visual interest or branding to a document, such as a logo or decorative image behind the text. It does not affect margins, fonts, or headers/footers.

The shortcut key Ctrl + E is used to center align the selected text in most text editing software, such as Microsoft Word. Ctrl + C is for copy, Ctrl + A is for select all, and 'None of these' is incorrect.