File Extensions and Their Uses – JKSSB Mock Test
File extensions are an important topic in JKSSB Computer Awareness exams. Understanding file extensions helps you know the type of file and which software is needed to open it.
This guide covers:
- What is a file extension?
- Common file extensions and their uses
- Tables for easy learning
- Examples and FAQs for JKSSB
What is a File Extension?
A file extension is a set of characters added at the end of a file name after a dot (.).
Example: document.pdf – Here, pdf is the file extension.
File extensions tell the computer which program can open the file. Each extension is linked to a specific file type.
Structure of a File Name
File Name + . + Extension
Example: resume.docx
- resume = File Name
- docx = File Extension
Importance of File Extensions
- Identify file type (document, image, video, etc.)
- Tell the system which software to use
- Protects files from misuse (security)
- Helps organize and manage data
Common File Extensions and Their Uses
1️⃣ Document File Extensions
| Extension | Use | Example |
|---|---|---|
| .doc / .docx | Microsoft Word Document | report.docx |
| Portable Document Format | ebook.pdf | |
| .txt | Plain Text File | notes.txt |
| .odt | OpenDocument Text | letter.odt |
2️⃣ Image File Extensions
| Extension | Use | Example |
|---|---|---|
| .jpg / .jpeg | Compressed Image File | photo.jpg |
| .png | Portable Network Graphics (Transparent Image) | logo.png |
| .gif | Animated or simple image file | animation.gif |
| .bmp | Bitmap Image | image.bmp |
3️⃣ Audio and Video File Extensions
| Extension | Use | Example |
|---|---|---|
| .mp3 | Audio File | song.mp3 |
| .wav | Uncompressed Audio | recording.wav |
| .mp4 | Video File | movie.mp4 |
| .avi | Audio Video Interleave (Video) | video.avi |
4️⃣ Spreadsheet and Presentation Extensions
| Extension | Use | Example |
|---|---|---|
| .xls / .xlsx | Microsoft Excel Spreadsheet | data.xlsx |
| .csv | Comma Separated Values | marks.csv |
| .ppt / .pptx | Microsoft PowerPoint Presentation | slides.pptx |
5️⃣ Compressed File Extensions
| Extension | Use | Example |
|---|---|---|
| .zip | Compressed Archive | project.zip |
| .rar | Compressed File (WinRAR) | backup.rar |
| .7z | 7-Zip Compressed Archive | files.7z |
6️⃣ Programming File Extensions
| Extension | Use | Example |
|---|---|---|
| .html / .htm | Web Page Files | index.html |
| .py | Python Script | program.py |
| .java | Java Source Code | App.java |
| .c | C Language File | main.c |
| .cpp | C++ Language File | project.cpp |
7️⃣ System File Extensions
| Extension | Use | Example |
|---|---|---|
| .exe | Executable File (Windows) | setup.exe |
| .dll | Dynamic Link Library | driver.dll |
| .sys | System File | config.sys |
Other Important Extensions for JKSSB
- .apk: Android Application Package
- .iso: Disk Image File
- .bak: Backup File
- .tmp: Temporary File
- .log: Log File (Record of events)
Why Learn File Extensions?
- To identify the file type quickly
- To avoid opening malicious files (like fake .exe files)
- For safe file management
- To use the correct software for different files
Common Exam Questions (JKSSB)
- Q: What is the extension of a Word document?
A: .doc or .docx - Q: Which extension is used for video files?
A: .mp4 or .avi - Q: What is .exe file used for?
A: Executable program in Windows - Q: Which extension is used for images with transparent backgrounds?
A: .png - Q: What is the extension for a compressed file?
A: .zip or .rar
FAQs: File Extensions – JKSSB
Q1: What is a file extension?
Answer: A suffix at the end of a file name that indicates the file type.
Q2: Can file extensions be changed?
Answer: Yes, but changing it incorrectly can make the file unusable.
Q3: What is the extension of a text file?
Answer: .txt
Q4: Give two examples of audio file extensions.
Answer: .mp3 and .wav
Q5: What is .pdf used for?
Answer: Portable Document Format for documents
Final Thoughts
Learning file extensions is important for the JKSSB Computer Awareness exam. These small suffixes help identify files, prevent mistakes, and manage data properly.
Revise this list regularly and practice examples to improve your computer knowledge for the JKSSB exam.
All the best for your preparation!
