G9 L1 MINI

Why do computers use binary instead of other number systems?

• It’s easier to type

• It’s faster for humans to read

• Computers only understand ON and OFF states

• It takes up more space

What is binary made up of?

• Only 0s and 1s

• Letters and numbers

• 8 different symbols

• Digits from 0 to 9

Which file type needs the formula width × height × colour depth to find its size?

• Text

• Music

• Image

• Spreadsheet

How big is a 100 × 100 pixel image with 8-bit colour?

• 100,000 bits

• 10,000 bytes

• 800,000 KB

• 10 KB

Why are bits grouped into bytes?

• A byte is needed to store one character

• Bytes are easier to count

• A byte holds more voltage

• Bits are only used in hex

What is the largest number you can store using 8-bit binary?

• 128

• 255

• 256

• 512

What happens if you try to store 256 in 8 bits?

• The computer changes it to text

• An overflow error happens

• It becomes 999

• The number becomes negative

How many MB is a 2.5 GB file?

• 25

• 250

• 2,500

• 25,000

What is the best unit to describe the size of a full HD movie?

• Bytes

• Kilobytes

• Megabytes

• Gigabytes

Why is hexadecimal often used in computing instead of binary?

• It can store more data

• It uses letters for easier spelling

• It’s shorter and easier to read than long binary numbers

• It works better on phones