Data Compression and file types

Question 1

What does each file have?

Answer 1

File Extension

Question 2

What is the purpose of a file extension?

Answer 2

• What type of data it is

- Which application package will open that file

Question 3

What is .docx?

Answer 3

A Word file for Office 2007

Question 4

What is .xlsx

Answer 4

A excel file for Office 2007

Question 5

What is .pdf

Answer 5

A Portable Document Format File

Question 6

What is .accdb

Answer 6

An Access Database for Office 2007

Question 7

What are the problems associated with saving data?

Answer 7

• Backing storage devices have limited capacity
• Large files will also take longer to load than smaller ones
• If data is transmitted across a network, smaller files will get there quick than larger files

Question 8

How do you solve the problem of large files?

Answer 8

Files can be compressed to make them smaller when stored or sent but they need to be de-compressed.

Question 9

What are the Advantages of Data Compression?

Answer 9

• Files will take up less storage space when saved

- Files will reach their destination more quickly when sent over a network

Question 10

What are the Disadvantages of Data Compression?

Answer 10

• Precision can be lost

- It is not always possible to return to the uncompressed state

Question 11

Sounds can be saved using:

Answer 11

• .wav (File is not Compressed)
• wma. (File can be Compressed)

.mp3 (File can be Compressed)

Question 12

Images can be saved using:

Answer 12

.bmp (File is not Compressed)

.jpeg , .gif (File is Compressed)

Question 13

Videos can be saved using:

Answer 13

.mp4 (File is Compressed)

Question 14

Folders can be saved using:

Answer 14

.zip (File is Compressed)