Important File Extensions Questions and Answers

Answer: D

The audio file is album.wav.

WAV (Waveform Audio File Format), developed by Microsoft and IBM, stores sound, usually as uncompressed audio, and is widely used for recording and editing.

The other extensions are not audio: .pdf is a Portable Document Format document, and .jpg and .bmp are image formats (JPEG and bitmap).

Answer: B

The usual Excel extension is .xlsx.

Since Excel 2007, workbooks are saved by default in the Office Open XML format with the extension .xlsx. Older versions used .xls, and macro-enabled workbooks use .xlsm.

.exl, .excl and .exc are not Excel file extensions; they are invented to look like abbreviations of 'Excel'.

Answer: A

Correct answer: DOS Batch File

A .bat file is a batch file: a plain text list of DOS commands that the command interpreter runs in sequence. .com is the DOS command executable.

Answer: B

Correct answer: .swf

.swf is the compiled Flash movie that a player runs; .fla is the editable source file it is built from.

Answer: D

Correct answer: Free Lossless Audio Codec

FLAC stands for Free Lossless Audio Codec. It compresses audio to roughly half its size while keeping every sample of the original, unlike MP3, which discards detail permanently.

Answer: C

Correct answer: .pps

.pps is a PowerPoint Slide Show: the same content as a .ppt, but saved so that opening it starts the presentation instead of the editor.

Answer: D

Correct answer: .ttf

.ttf holds a TrueType font, the outline font format developed by Apple and adopted by Microsoft. The outlines are described mathematically, so the glyphs stay sharp at any size.

Answer: B

Correct answer: .com

.com is the DOS command file - a small executable loaded and run directly. .bat is a batch file of commands rather than an executable itself.

Answer: B

Correct answer: Tagged Image File Format

TIFF stands for Tagged Image File Format. It stores images without loss and can hold several pages in one file, which is why scanners and the printing trade favour it over JPEG.

Answer: B

Correct answer: .py

.py marks a Python source file. When it is run, Python compiles it to bytecode and may cache that alongside as a .pyc file to save recompiling next time.