TOPIC 1

Question 1

Define Data

Answer 1

Data is raw facts and figures which has not been processed and has no meaning

Question 2

Define information

Answer 2

Information is data that has been processed and therefore has meaning and context

Question 3

Define pixel

Answer 3

A pixel is the smallest unit of digital image that can be displayed and edited on a computer screen

Question 4

State 3 characteristics of a pixel

Answer 4

> A pixel is the smallest area that can be edited on a graphic > Each pixel has its own colour > When combined together pixels form an image

Question 5

Define resolution

Answer 5

Resolution is the measure of the quality of an image per number of pixels.

Question 6

A high resolution image contains a high number of pixels. What can this lead to?

Answer 6

> Longer loading times
Longer file transfer times between communication links

Question 7

Define a bitmapped image

Answer 7

Bitmap image graphics are made up of pixels which can provide high quality photographs

Question 8

State 3 examples of bitmaps image

Answer 8

> JPEG
TIFF
GIFF

Question 9

Define a thumbnail

Answer 9

A thumbnail image is a smaller version of an image. You click on the thumbnail to display the full version image

Question 10

State 2 advantages of a thumbnail

Answer 10

> Reduces the loading time for pages
Shows a preview of the image

Question 11

Define vector based images

Answer 11

Vector i ages are made up of mathematical equations which are not affected by scaling

Question 12

State 3 features of vector based images

Answer 12

> The image can be resized without loss of quality
The image quality does not depend on resolution
Suitable for diagrams and symbols

Question 13

State 3 advantages of vector based images

Answer 13

> WMF
EPS
SWF

Question 14

State 2 differences between bitmap and vector based images

Answer 14

> Can be resized without loss of quality of vector based images whereas bitmapped images will be pixelated when resized
There is no need to store individual pixel values in vector based images

Question 15

What is streaming?

Answer 15

Streaming a video involves initiating the playing of the video shortly after the first few seconds of the video file have been downloaded, allowing the video to be watched in real time

Question 16

State three advantages of streaming

Answer 16

> The video is unlikely to be replicated
The user does not have to wait for the entire file to download
The users computer does not need to be capable of storing the entire file

Question 17

Define buffering

Answer 17

A part of memory used to store a downloaded video before it is watched

Question 18

What is buffering

Answer 18

During streaming, a video is both downloading in the backround and playing in the foreground.

Question 19

What is representing sound?

Answer 19

Conversion to digital is necessary. computers do not understand analogue signals this needing to convert the signals to digital

Question 20

What is the difference between analogue and digital signals?

Answer 20

Analogue signals are continuous signal whereas digital signals are binary digits

Question 21

Define anal;ogue signals

Answer 21

An analogue signal is a continuous signal varying frequency that represents a physical such as sound.

Question 23

Define digital signals

Answer 23

A digital signal is a binary signal with 1s and 0s as values