Question 1

What is procedural decomposition? [2 marks]

Accepted Answer

Breaking a problem into smaller sub-problems making it more manageable to solve.  Each of which solves an identifiable task; Each of which might be further subdivided;

Question 2

What is representational abstraction? [1 mark]

Accepted Answer

Removing details

Question 3

What is abstraction by generalisation? [1 mark]

Accepted Answer

Grouping by common characteristics

Question 4

Digital data has a continuous set of values and in theory can be measured to any degree of accuracy with an infinite range of values

Accepted Answer

false

Answer

true

Question 5

How does a computer capture an image? [3 marks]

Question 6

Bitmap images are also referred to as?

Accepted Answer

Raster graphics

Answer

Rasfar images

Answer

Raster images

Answer

Rasfar graphics

Question 7

Why is there a deterioration in quality when a bitmap is resized? [1 mark]

Accepted Answer

Resolution doesn’t define the actual physical size of an image. If an image is made bigger (or smaller), the size of each pixel grows or shrinks to maintain the required resolution

Question 8

What is metadata? [2 marks]

Accepted Answer

Metadata is data about data and is stored within the same file as the image data. Some examples include: the date the image was taken, colour depth, the camera make and model, width and height in pixels, author.

Question 9

What are vector graphics?

Accepted Answer

freetext://Vector graphics are based on mathematical relationships with control points that make up the image.

Information is not stored about each pixel.

These points are connected by lines and curves called vector paths or vectors.

The properties of each geometric object/shape in the vector graphic image are stored as a list.

Question 10

Compare vector graphics to bitmap images?

Accepted Answer

freetext://Bitmaps store the colour of each pixel. Large amount of
storage needed.

Vector graphics store info about the properties of the
objects that make up the image which is only a small
amount of storage.

Individual objects in a vector graphics can be edited.

Image or parts of vector graphics image can be scaled without loss of
quality.

If an vector graphics object is deleted the software knows what is
behind so no “hole” is left in the image.

Question 11

Advantages of vector graphics?

Accepted Answer

multiplem

Answer

Will appear computer generated - the computer calculates its scale and therefore makes the image look computer generated on the screen.

Question 12

Give an example of an ADC or DAC? [1 mark]

Accepted Answer

microphone

Question 13

How does an analogue to digital converter work?

Accepted Answer

freetext://The microphone analogue sensor picks the signal

Analogue sound samples are taken by the amplifier

Each sample is quantised to measure its wave height
and translate this into an integer value

The integer value is then approximated to the nearest
allowed value and stored as a binary value

To output a sound, the reverse happens

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