With respect to computer networks, which of the following is the correct expanded form of RJ 45 ? (A) Radio Jo

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Q. With respect to computer networks, which of the following is the correct expanded form of RJ 45 ? (A) Radio Jockey 45 (B) Registered Jockey 45 (C) Radio Jack 45 (D) Registered Jack 45

Odisha ChseCBSE Class XII Board 2026MCQ· 1mImportance★★★★★

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Concept understanding — Acronym Expansion

Acronym Expansion

You already know acronyms. When you say "UNESCO" instead of "United Nations Educational, Scientific and Cultural Organization," you are using an acronym. Acronym expansion is simply the reverse process: taking the short form and writing out every word it stands for, in full, exactly once.

The intuition is straightforward. Think of a nickname. If someone is called "Ravi" but their full name is "Ravindra Kumar Sharma," then expanding the nickname means writing the full name. Acronym expansion does the same thing for abbreviations made from initial letters.

The Precise Meaning

Acronym expansion means writing each word that the letters of the acronym represent, in the correct order, without adding or omitting any word. The acronym itself is a compressed label; expansion decompresses it back to the original phrase.

For example:

UNESCO expands to United Nations Educational, Scientific and Cultural Organization
NATO expands to North Atlantic Treaty Organization
GDP expands to Gross Domestic Product

Note

An acronym is formed from the first letters of a multi-word name. Not every abbreviation is an acronym — "Dr." is an abbreviation, not an acronym, because it is not spoken as a word. Acronyms are spoken as words (like "NASA") or as letter sequences (like "WTO").

Why It Matters

In commerce and humanities, you will encounter acronyms constantly — in textbooks, news articles, government reports, and business documents. Knowing what an acronym stands for is not enough; you must be able to expand it correctly because:

Precision matters. "FDI" and "FPI" both involve foreign investment, but they mean different things. Expanding them — Foreign Direct Investment versus Foreign Portfolio Investment — makes the distinction clear.
Context changes meaning. The same acronym can expand differently in different fields. "WTO" in trade means World Trade Organization; in tourism, it could mean World Tourism Organization. Expansion removes ambiguity.
Exams test exact recall. You may be asked to "expand the acronym WTO" or "write the full form of IMF." There is no room for approximation. The expansion must match the official name exactly.

A Common Mistake …

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RJ 45 stands for Registered Jack 45, referring to a standardized network interface for connecting telecommunications or data equipment.

Concept and Intuition

In computer networks, devices need to connect to each other to communicate. This connection often happens through physical cables, and these cables need specific connectors to plug into ports on devices like computers, routers, and switches. To ensure that equipment from different manufacturers can connect and work together seamlessly, standards are crucial.

The "RJ" in RJ 45 refers to a series of such standardized network interfaces. These standards define not just the physical shape of the connector, but also the specific wiring pattern inside it. This ensures that when you plug a cable into a port, the correct electrical signals are sent to the correct pins, allowing data to flow properly. The term "Registered" signifies that these standards are officially defined and documented, historically by the US Federal Communications Commission (FCC), to ensure interoperability across the telecommunications industry.

Step-by-step Solution

Understanding "RJ": The prefix "RJ" stands for Registered Jack. This term originated from the US telephone system, where the FCC (Federal Communications Commission) established a series of "Registered Jack" standards. These standards specify the wiring patterns for connecting telecommunications equipment to a service provider's network. While initially for telephones, the concept extended to data networking.
Understanding "45": The number "45" in RJ 45 is a specific identifier within the Registered Jack system. It denotes a particular wiring configuration for an 8-position, 8-contact (8P8C) modular connector. This specific wiring standard is widely used for Ethernet connections in local area networks (LANs). …

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Q.With respect to computer networks, which of the following is the correct expanded form of RJ 45 ? (A) Radio Jockey 45 (B) Registered Jockey 45 (C) Radio Jack 45 (D) Registered Jack 45

Concept and Intuition

Step-by-step Solution

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