Week 0 Scratch

Question 1

What is a bit?

Answer 1

A binary digit - e.g., a 0 or a 1

Question 2

How would you explain what transistors are?

Answer 2

Transistors are tiny lightbulbs that go on/off.
- You need more transistors to store more memory

Question 3

What is a byte?

Answer 3

A byte is 8 bits

Question 4

What is ASCII mapping?

Answer 4

• Mapping for the English language where each single character is worth a Byte (8 bits)
• Alphabet begins at 65 (A)
• More advanced characters use more bits - e.g., 16, 24, 32

Question 5

How is colour represented?

Answer 5

Using RGB - red green blue
- 3 Numbers for one pixel - so 24 bits per pixel

Question 6

What is an algorithm?

Answer 6

Step by step instructions to turn an input into an output - a problem into a solution

Question 7

What is the definition of a function?

Answer 7

An action or verb. A bite-sized task that a computer can do for you

Question 8

What is a conditional?

Answer 8

‘Forks in the road’ where you ask a question and decide which way to go - e.g., if, else if etc

Question 9

What is a boolean expression?

Answer 9

The questions you ask to a conditional - a question you ask with a yes or no answer (True or False) to decide which fork in the road to go down

Question 10

What is a loop?

Answer 10

A cycle that makes you keep going back to a particular point

Question 11

What is pseudocode?

Answer 11

A human-readable version of your code