Data Representation

Question 1

Explain how an integer would be stored in a computer

Answer 1

An integer would be stored a **binary number

Question 2

Write the conversion table to convert a binary number to a denary number

Answer 2

128 |64 | 32 | 16 | 8 | 4 | 2 | 1

Question 3

What is a real number

Answer 3

A number with a decimal point

Question 4

How would a real number be stored in a computer

Answer 4

A real number would be stored in
binary using floating point representation with a mantissa and exponent

Question 5

What is an integer

Answer 5

A whole number (with no decimal point)

Question 6

Identify the Mantissa - 0.5387 X10 ²³

Answer 6

5387

Question 7

Identify the Exponent - 0.5387 X10 ²³

Answer 7

23

Question 8

What is a control character give an example

Answer 8

Control characters are used to perform actions rather than to display a printable character on screen.

Examples include ‘Escape’, ‘Backspace’ and ‘Delete

Question 9

What is a printable character and give an example of one

Answer 9

Printable characters are used to show a character on screen.

Letters, symbols, numbers and punctuation marks are all examples of printable characters.

Question 10

How would text or a string be stored in a computer

Answer 10

Text would be stored using extended ASCII each character would be respresented by a 8 bit binary number

Question 11

How many bits would it take to represent the phrase “data representation”

Answer 11

162 (19 x 8)

19 letters 4 for data, 1 for the space and 14 for representation

Question 12

Using extended ASCII how many characters could be represented using 64 bits?

Answer 12

8

8 bits per character - 64/8

Question 13

Explain how a bit map graphic would be stored in a computer

Answer 13

A bit map would be stored as a grid of pixels with a binary number used to represent the colour of each pixel

Question 14

Explain how a vector graphic would store an image in a computer

Answer 14

In a vector graphic each shape is represented by an object which has number of attributes that define how it looks

Question 15

List the 4 vector graphic objects you need know for Nat 5 Computing

Answer 15

Polygon
Rectangle
Ellipse
Line

Question 16

Name vector graphic object used for a 5 sided shape

Answer 16

Polygon

Question 17

Name the vector graphic object used to represent an Octagon

Answer 17

Polygon

Question 18

Name the vector graphic object used to respresent a circle

Answer 18

Elipse

Question 19

Name the vector graphic object used to represent an oval

Answer 19

Elipse

Question 20

Name the vector graphic object used to represent a square

Answer 20

Rectangle

Question 21

Name the vector graphic object and 2 attributes to represent a red rectangle

Answer 21

Object: Rectangle
Attributes: x and y coordinates, line colour and fill colour

Question 22

Name the vector graphic object and 2 attributes used to represent a blue line

Answer 22

Object: Line
Attributes: x and y coordinates and line colour

Question 23

List the 3 vector graphic atributes you need know for Nat 5 Computing

Answer 23

Coordinates
Line colour
Fill colour

Question 24

Which of the following vector graphic atributes should not be used with a line object. Coordinates, Line colour, Fill colour

Answer 24

Fill colour