Practice Data Compression Multiple Choice Questions with Answers Quiz-1

Q.1.

What is data compression

Restructuring Data
Modifying Data
Both A & B
None of These

Q.2.

Applications of Huffman Coding

Text compression
Audio compression
Lossless image compression
All of the above

Q.3.

The idea with wavelets is to represent a complicated function by

simple basic functions
sinus functions
lines
square functions

Q.4.

Advantages for lossless compression

The quality will not be affected much
Will send quicker
A very simple algorithm
All of above

Q.5.

The purpose of data compression is to decrease file sizes .

True
False

Q.6.

Which formula shows how to work out the percentage a file has been compressed by?

bits in (Huffman *7) /100
bits in ASCii - bits in Huffman
difference in bits / bits in ASCII * 100
None of these

Q.7.

How do you calculate the number of bits of a body of text in ASCII?

Number of characters * 7
Number of characters (including spaces) *7
bits in Huffman * 7
bits in Huffman / 7

Q.8.

How do you move through a Huffman tree?

0 = right 1= left
1 = left 2 = right
0 = left 1 = right
0 = middle 1 = back

Q.9.

Huffman trees use the _______________ of each character to work out their encoding.

Frequency
Order in ASCII
Number value
None of these

Q.10.

Lossy or lossless? This type of compression gets rid of some information

Lossy
Lossless
Both
None of these

Q.11.

Lossy or lossless? This type of compression makes the file smaller

Lossy
Lossless
Both
All of above

Q.12.

Which best describes Lossless Compression?

No information is lost but file size is increased
There is no loss in information at all after compression
Files which have the exact same data after compression
Compression that involves an algorithm

Q.13.

Lossy or lossless? This type of compression does not get rid of any data

Lossy
Lossless
Both
All of above

Q.14.

Application of LZW

GIF
Zip
PNG
All of the above

Q.15.

Compression packages which use an LZ77-based algorithm followed by a variable-length coder.

PKZip
Zip
PNG
All of the above

Q.16.

LZhas ___ compression but very ____ decompression.

fast, slow
slow, fast
None of these
All of above

Q.17.

Full form of GIF

Graphics Interchange Form
Graphics Inter Format
Graphics Interchange Format
Graphics Interact Format

Q.18.

LZand LZare the two algorithms used for

Lossy data compression
Lossless data compression
Both
None of the above

Q.19.

Which of these terms is a type of data compression?

resolution
zipping
inputting
caching

Q.20.

Adaptive dictionary –

holding strings previously found in the input stream
sometimes allowing the addition of strings but no deletions
allowing for additions and deletions of strings as new input symbols are being read
Both (A) and (B)
Both (A) and (C)

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