Computer Abbreviations — Patwari Notes
The most frequently asked computer-related abbreviations — hardware terms like CPU, RAM, ROM, BIOS, USB, software terms like PDF, GUI, OS, and the order of memory measurement units — given together here at RSCIT level for the Patwari exam.
- RSCIT-level depth
- 6 min read
Why Are Computer Abbreviations Important?
Asking for the full form of an abbreviation is a very common question type in the Computer Knowledge section — such as 'What is the full form of CPU?'. Here, the most frequently asked abbreviations related to hardware, memory and general computer terminology are given together. (Internet-related abbreviations — such as WWW, HTTP, ISP — are covered separately in the Internet Basics notes.)
Abbreviations Related to Hardware and Processing
| Abbreviation | Full Form |
|---|---|
| CPU | Central Processing Unit |
| ALU | Arithmetic Logic Unit |
| CU | Control Unit |
| RAM | Random Access Memory |
| ROM | Read Only Memory |
| BIOS | Basic Input Output System |
| USB | Universal Serial Bus |
| VDU | Visual Display Unit |
| LED | Light Emitting Diode |
| LCD | Liquid Crystal Display |
Remember the difference between RAM and ROM — RAM is temporary (data is erased when the computer is switched off), ROM is permanent (data remains safe even when switched off).
Abbreviations Related to Files, Storage and Software
| Abbreviation | Full Form |
|---|---|
| Portable Document Format | |
| GUI | Graphical User Interface |
| OS | Operating System |
| CD | Compact Disc |
| DVD | Digital Versatile Disc |
| GB / MB / KB | Gigabyte / Megabyte / Kilobyte |
| JPEG / JPG | Joint Photographic Experts Group |
| MP3 | MPEG Audio Layer 3 |
| ZIP | The name of a compressed file format (this is not an abbreviation of another term) |
Remember the order of storage units: 1024 KB = 1 MB, 1024 MB = 1 GB — going from a smaller to a larger unit is always a multiple of 1024.
The Order of Memory Measurement Units
Computer memory is measured in Bytes, and larger units equal 1024 times the smaller unit: 1 Byte = 8 Bits, 1 Kilobyte (KB) = 1024 Bytes, 1 Megabyte (MB) = 1024 KB, 1 Gigabyte (GB) = 1024 MB, 1 Terabyte (TB) = 1024 GB. This order (Bit → Byte → KB → MB → GB → TB) can be asked about directly in exams.
Memory Trick / Exam Tip
Trick to remember RAM vs ROM: RAM = 'Remembers only while Active' (it remembers only while the computer is on), ROM = 'Read Only, Retains' (stays safe permanently, even when switched off).
Frequently Asked Questions
What is the full form of CPU?+
The full form of CPU is Central Processing Unit — it is considered the computer's 'brain', processing all calculations and instructions.
What is the difference between RAM and ROM?+
RAM (Random Access Memory) is temporary memory — its data is erased when the computer is switched off; ROM (Read Only Memory) is permanent — its data remains safe even when switched off.
How many MB are there in 1 GB?+
There are 1024 MB (Megabytes) in 1 GB (Gigabyte) — every larger memory unit equals 1024 times the smaller unit.
What is the full form of GUI?+
The full form of GUI is Graphical User Interface — it is the way in which a user interacts with a computer through icons and menus instead of text commands, such as in Windows.
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