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FC0-U71 Practice Question: Which THREE of the following are common file…
Which THREE of the following are common file formats for images?
⚠ Common exam trap
Test-takers frequently confuse file extensions based on common usage (e.g., .mp3 for music or .docx for documents) rather than recognizing them as non-image formats, leading them to select these incorrect options.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
.gif
Option C (.gif) is correct because GIF (Graphics Interchange Format) is a standard raster image format supporting indexed color and animation. Option D (.png) is correct because PNG (Portable Network Graphics) is a common lossless raster image format widely used for web graphics. Option E (.jpg) is correct because JPEG (.jpg) is a ubiquitous lossy compressed raster image format for photographs. Option A (.mp3) is incorrect because MP3 is an audio compression format, not an image format. Option B (.docx) is incorrect because DOCX is a Microsoft Word document format for text and rich content, not an image format.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
.mp3
Why it's wrong here
The .mp3 extension denotes compressed audio, not a raster or vector image format, so it cannot store pictures. It is tempting because .mp3 is a widely recognised media container, correctly chosen when the requirement is audio playback rather than image storage.
- ✗
.docx
Why it's wrong here
.docx is a Microsoft Word document format, storing text and formatting rather than pixel or vector image data, so it cannot serve as an image file. It is tempting because documents often embed images, but the container itself is text-based; formats such as .png, .jpg or .gif are the actual image choices.
- ✓
.gif
Why this is correct
.gif is a raster image format supporting up to 256 colours, lossless compression and simple animation, which satisfies the stem's requirement for a common image file format. Its palette limitation distinguishes it from .jpg and .png, but it remains a standard web image type alongside those formats.
- ✓
.png
Why this is correct
.png is a raster image format using lossless DEFLATE compression with alpha-channel transparency, satisfying the question's requirement for a common image file format. It is widely produced by screenshot tools, web browsers and graphics editors, distinguishing it from document or audio formats.
- ✓
.jpg
Why this is correct
.jpg is a lossy raster image format using discrete cosine transform compression, meeting the question's requirement for a common image file format. Its photographic compression makes it the default output of digital cameras and web publishing, unlike text, video or executable formats.
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Same concept, more angles
2 more ways this is tested on FC0-U71
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Which THREE of the following are common file extensions for image files?
medium- A..mp3
- ✓ B..png
- ✓ C..jpg
- D..xlsx
- ✓ E..gif
Why B: Option B (.png) is correct because PNG (Portable Network Graphics) is a standard raster image format that supports lossless compression and transparency. Option C (.jpg) is correct because JPEG (.jpg/.jpeg) is one of the most common lossy-compressed photographic image formats. Option E (.gif) is correct because GIF (Graphics Interchange Format) is a widely used image format supporting indexed color and simple animation. Option A (.mp3) is not an image extension but an MPEG-1/2 Audio Layer III audio format, and Option D (.xlsx) is not an image extension but the Microsoft Excel Open XML spreadsheet format.
Variation 2. Which TWO of the following are common file formats for images?
medium- A.PDF
- ✓ B.PNG
- C.TXT
- D.MP3
- ✓ E.JPEG
Why B: PNG (B) is a correct answer because it is a raster image format that uses lossless compression and supports transparency, making it a standard format for web graphics and screenshots. JPEG (E) is also correct because it is a widely used raster image format that applies lossy compression, ideal for photographs and continuous-tone images. The other options do not belong: PDF (A) is a document format for page layout and text/vector content, TXT (C) is a plain-text format, and MP3 (D) is a compressed audio format.
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This FC0-U71 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the FC0-U71 exam.