Important File Extensions Questions and Answers

Answer: C

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: A

Correct answer: True

.dat is a generic data file extension: it says the contents are data for some program without identifying the program or the format, so the statement is true.

Answer: A

Correct answer: Word Perfect Document

WPD is the document format of WordPerfect, the word processor that dominated before Word. The extension is built from the product name.

Answer: C

Correct answer: Backup file

.bak marks a backup copy, usually written automatically before a program overwrites the original. Renaming it back to the original extension is the normal way to recover the earlier version.

Answer: D

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: 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: A

Correct answer: .bin

.bin is the extension of a MacBinary II encoded file, which packs a Mac file's data fork, resource fork and metadata into a single stream for transfer over systems that know nothing of forks.

Answer: C

Correct answer: .java

Java source files take .java, and the compiler turns each into a .class file of bytecode.

Answer: A

Correct answer: .sys

.sys marks a system file, typically a device driver or a component the operating system loads at startup.

Answer: B

Correct answer: .ra

.ra is RealAudio, the streaming audio format from RealNetworks.