Section Seven - Data Representation

Question 1

Fill in the gaps:

1) apply (2) operators to (3

Answer 1

(1) Logic Gates
(2) Boolean Operators
(3) inputs

Question 2

Complete the sentence:

NOT gates takes a single Input…

Answer 2

…and gives a single output

Question 3

What is a feature of a NOT gate?

Answer 3

The output is always the opposite value to the Input

Question 4

Finish the sentence:

AND gates take two inputs…

Answer 4

…and give one output

Question 5

Finish the sentence:

OR gates take two inputs…

Answer 5

…and give one output

Question 6

What is the size of a bit (b)?

Answer 6

A single binary digit (1 or 0)

Question 7

What is a parity bit used for?

Answer 7

To check for errors in binary numbers?

Question 8

What is a Binary Shift?

Answer 8

Used to Multiply or Divide numbers, every bit is moved along to the left or the right

Question 9

When do Overflow Errors occur?

Answer 9

When a number has too many bits?

Question 10

What are Images stored as?

Answer 10

A series of pixels

Question 11

What increases the file size of a image?

Answer 11

Increasing the Colour Depth and Resolution

Question 12

What do devices need to display images?

Answer 12

Metadata

Question 13

What does Metadata include?

Answer 13

File format, height, width, colour depth and resolution

Question 14

What factors affect the size and quality of sound files?

Answer 14

Sampling intervals
Sampling frequency
Sample size
Bit rate

Question 15

What are the two types of compression?

Answer 15

Lossless and Lossy

Question 16

How does Lossy compression work?

Answer 16

Works by permanently removing data from the file

Question 17

How does Lossless compression work?

Answer 17

Works by making the file smaller by temporarily removing data to store the file and restores it to original state when it’s opened