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Files & Extensions

Reasoning & Computer Aptitude · Computer Fundamentals

Useful for: IBPS Banking

Overview

File extensions tell the system and user which program opens a file.

Key points

.docx (Word), .xlsx (Excel), .pptx (PowerPoint), .pdf (portable document).
.jpg/.png (images), .mp3 (audio), .mp4 (video).
.zip (compressed archive), .exe (executable program in Windows), .txt (plain text).
.html (web page), .csv (comma-separated values).
Opening unknown .exe attachments is a common malware risk.

Explanation

.png supports transparency; .jpg uses lossy compression.
CSV files open in spreadsheets and databases.
Hidden extensions can disguise malware (e.g. invoice.pdf.exe).
File size units: KB, MB, GB.

Step by step

Identify the term or device asked.
Recall its definition or function.
Eliminate options from other categories.

Examples

A file with values separated by commas → .csv.
An executable program file in Windows → .exe.
A compressed archive → .zip.

Traps and advanced points

Trap: Opening .exe attachments from unknown senders.
Trap: Mixing .xlsx and .docx.
Trap: Thinking .jpg is lossless.

Quick revision

Office: docx, xlsx, pptx.
csv, zip, exe.
Beware double extensions.

Practice MCQs

In Excel, a formula normally begins with which symbol?
1. @
2. =
3. &
4. #
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Answer: (b) =. Correct: =.
Applied recall: Which Microsoft Office application is mainly used for word-processing documents?
1. Microsoft PowerPoint
2. Microsoft Excel
3. Paint
4. Microsoft Word
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Answer: (d) Microsoft Word. Correct: Microsoft Word.
Applied recall: Which shortcut commonly saves the current document?
1. Ctrl+Z
2. Ctrl+N
3. Ctrl+S
4. Ctrl+F
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Answer: (c) Ctrl+S. Correct: Ctrl+S.
Which Microsoft Office application is mainly used for slide presentations?
1. Microsoft Word
2. Calculator
3. Microsoft PowerPoint
4. Microsoft Excel
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Answer: (c) Microsoft PowerPoint. Correct: Microsoft PowerPoint.
Computer awareness: “spreadsheet” is best matched with:
1. service that indexes/retrieves web information
2. software for tabular data, formulas and analysis
3. fraudulent attempt to steal sensitive information by impersonation
4. Internet Protocol
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Answer: (b) software for tabular data, formulas and analysis. Spreadsheet” is best matched with software for tabular data, formulas and analysis.
Computer awareness: “CSV” is best matched with:
1. Read Only Memory
2. Comma-Separated Values
3. application used to access web content
4. software for creating/editing formatted text documents
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Answer: (b) Comma-Separated Values. CSV” is best matched with Comma-Separated Values.
Computer awareness: “PDF” is best matched with:
1. Comma-Separated Values
2. Hypertext Transfer Protocol
3. Structured Query Language
4. Portable Document Format
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Answer: (d) Portable Document Format. PDF” is best matched with Portable Document Format.
In a Ranchi office practice scenario, Applied recall: Which Microsoft Office application is mainly used for word-processing documents?
1. Microsoft PowerPoint
2. Microsoft Excel
3. Paint
4. Microsoft Word
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Show answer
Answer: (d) Microsoft Word. Word is designed for creating and editing text documents.
In a Ranchi records practice scenario, Applied recall: Which shortcut commonly saves the current document?
1. Ctrl+Z
2. Ctrl+N
3. Ctrl+S
4. Ctrl+F
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Answer: (c) Ctrl+S. Ctrl+S is the common save shortcut.
In a Ranchi training practice scenario, Which Microsoft Office application is mainly used for slide presentations?
1. Microsoft Word
2. Calculator
3. Microsoft PowerPoint
4. Microsoft Excel
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Show answer
Answer: (c) Microsoft PowerPoint. PowerPoint is used to create and present slide decks.