GCSE A451 - Internet

Question 1

Describe HTML (2 marks)

Answer 1

 HyperText Mark-up Language
 Text file containing the text to be displayed…
 … uses tags which indicate how to display it
 … location of pictures/other elements to include
 … and hyperlinks to other locations/URLS

Question 2

Explain why HTML is important when creating web pages (2 marks)

Answer 2

 Web browser used to interpret the file and display the
data correctly
 Because it is an open/accepted standard…
 … data will display correctly on all browsers
 … which conform to the standard

Question 3

What type of file is a JPG?

Answer 3

A high resolution image

Question 4

What type of file is a PDF?

Answer 4

read only text file

Question 5

What type of file is a MP3?

Answer 5

audio/sound

Question 6

What type of file is a MPEG?

Answer 6

video

Question 7

What type of file is a ZIP?

Answer 7

compressed file

Question 8

Explain the importance of compressing files when transmitting over the Internet.

Answer 8

 It reduces the size of the file which needs to be
transmitted
 Shortens download time
 Reduces Internet traffic 
 Allows multimedia files to be streamed

Question 9

Describe the difference between lossy and lossless compression and give an example where each could be used (4 marks)

Answer 9

 In lossy compression, when the data is
uncompressed it is not exactly the same as the
original
 But the difference is so small that it cannot normally
be noticed
 Eg music files(mp3), large resolution images for
displaying on small screens.
 In lossless compression, when the data is
uncompressed it is restored completely to the
original file
 Eg compressed text files