12th Standard Computer Applications March 2023: Online Practice Test

Explanation. Web casting is the live broadcasting (telecasting) of real-time programs such as events and shows over the Internet.

Explanation. In PageMaker, the area inside the dark border is the page, and the area outside it is the pasteboard, used to keep objects temporarily; objects on it are not printed.

Explanation. MySQL is a Relational Database Management System (RDBMS): data is stored in tables of rows and columns and accessed using SQL.

Explanation. According to the server-side scripting usage statistics quoted in the textbook, about 78.9% of websites are developed using PHP.

Explanation. An associative array stores data as key-value pairs, where each value is accessed using a named key instead of a numeric index.

Explanation. Loops that run a block of code a specified (fixed) number of times are called bounded loops; loops that repeat until a condition changes are unbounded loops. A for loop is one example of a bounded loop, but the category itself is called bounded loops.

Explanation. In a group of radio buttons only one option can be selected at a time, whereas check boxes allow several selections.

Explanation. In the history of networking, SAGE and SABRE were early systems and ARCNET was an early LAN; the new fibre optics period brought speeds towards gigabit levels.

Explanation. RFID (Radio Frequency Identification) uses radio signals to identify and track objects through tags attached to them.

Explanation. In DNS, each node label can have at most 63 characters, while a full domain name can have at most 255 characters.

Explanation. Fiber optic cables, used for long-distance high-speed links, are laid deep underground so that they are protected from damage.

Explanation. The dotcom phenomenon refers to the rapid growth of Internet-based companies (whose names ended in .com) in the late 1990s.

Explanation. NS2 (Network Simulator version 2) is an open source network simulator; C++ and TCL are the languages used to build and script it.

Explanation. PGP stands for Pretty Good Privacy, an encryption program used to secure e-mail and data.

Explanation. The Zoom tool in PageMaker magnifies (or reduces) a particular area of the page; the Hand tool only scrolls the page.