Important File Extensions Questions and Answers

Answer: D

Correct answer: Portable Document Format

PDF stands for Portable Document Format, Adobe's format for documents that look the same on every machine because the file carries its own fonts and layout.

Answer: C

Correct answer: .sql

.sql holds SQL statements - a script of queries or a dump of a database as the commands needed to rebuild it. .db holds the database itself rather than the statements.

Answer: D

Correct answer: Graphics Interchange Format

GIF is Graphics Interchange Format. The first word is the noun Graphics, not the adjective Graphical, which is what separates the answer from its near neighbour among the options.

Answer: C

Correct answer: Photoshop Document

PSD is Photoshop Document, the native Photoshop format, which preserves layers, masks and channels that a flattened format such as JPEG would discard.

Answer: A

Correct answer: photoshop document

.psd is the native Photoshop file, keeping layers and editing information intact. A flattened picture file such as .jpg or .png keeps only the finished image.

Answer: A

Correct answer: .gz

.gz marks a file compressed with gzip, the GNU compression program. A tarball compressed this way is commonly .tar.gz, since tar bundles the files and gzip compresses the bundle.

Answer: D

Correct answer: .msi

.msi is a Microsoft Installer package - a database of files and instructions that the Windows Installer service reads to install a program.

Answer: D

Correct answer: Java bytecode compiled from source

A .class file holds the bytecode produced when the Java compiler processes a .java source file. The Java Virtual Machine executes this bytecode, which is what lets the same compiled file run on any platform with a JVM.

Answer: B

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: B

Correct answer: Self Extracting Archive

.sea is a Self-Extracting Archive on the Mac: a compressed archive that carries the code to unpack itself, so no separate utility is needed.