Unit 1 - Digital Data

Question 1

define Data

Answer 1

raw facts and figures

Question 2

define Information

Answer 2

data that has been processed

Question 3

What does it mean by processing?

Answer 3

searching, sorting, validation, conversion, analysis & calculation

Question 4

What is a ‘bit’ short for? Define and give an example

Answer 4

Binary Digit. It’s the smallest unit of data that can be stored by a computer. 1 or 0.

Question 5

How many bits are there in a nibble

Answer 5

4

Question 6

How many bits does a byte have? Explain what a byte can be and give an example

Answer 6

8. A single keyboard character e.g. letter A

Question 7

Order of Units of storage smallest to largest

Answer 7

bit, nibble, byte, kilobyte, megabyte, gigabyte, terabyte

Question 8

define Data type

Answer 8

a general classification of data that tells the computer how the programmer intends to use the data

Question 9

State 5 data types

Answer 9

numeric, date/time, character, string, boolean

Question 10

Numeric data type: Integer and Real

Answer 10

Integer is a whole number and a Real numeric is a number that contains a decimal point

Question 11

Date/Time data type

Answer 11

a date or time can be stored

Question 12

Character data type

Answer 12

a single alphanumeric character

Question 13

String data type

Answer 13

a series of alphanumeric characters

Question 14

Boolean data type

Answer 14

true or false

Question 15

What’s a commonly used character set for storing Characters?

Answer 15

ASCII - American Standard Code for Information and Interchange

Question 16

What’s Unicode?

Answer 16

the new standard for representing characters of all the languages in the world. It can represent 2^16 unique characters

Question 17

The word “pixel” is made up of?

Answer 17

picture and element

Question 18

define Pixel

Answer 18

smallest unit of an image that can be changed. Basically a tiny block of colour that a computer uses to build up an image.

Question 19

What do you call an image made up of pixels?

Answer 19

bitmap image (as it uses a ‘map’ of where the ‘bits’ of information are stored)

Question 20

What’s the Resolution of an image

Answer 20

the number of pixels used in an image

Question 21

What happens if we adjust the image resolution high in a bitmap image

Answer 21

high quality images and more storage space needed

Question 22

Vector graphics use?

Answer 22

lines, curves and shapes

Question 23

state 3 features of a Vector image

Answer 23

can be resized very easily, stretched without losing the quality of an image, image quality doesn’t depend on resolution

Question 24

Give an example of each: bitmap and vector graphics

Answer 24

bitmap - photographs

vector - diagrams