Data Representation GCSE Computer Science Revision

what is the maximum value an 8 bit binary number can have?

• 8

• 255

• 128

• 256

Which number could be a Hexadecimal number?

• FG

• AD

• IP

• CT

what is the denery (decimal) value of the binary number

0101

• 101

• 16

• 5

• 9

convert 12 to a binary number nd you get....

• 01100

• 01010

• 11000

• 10101

which file extension could be a picture

• .mp3

• .jpg

• .xls

• .doc

If a picture is 100 pixels by 10 pixels and uses 3 bits per pixel for colours how many colours can it have

• 3000

• 8

• 1000

• 3

If a picture is 100 pixels by 10 pixels and uses 3 bits per pixel for colours, what is the file size in bits

• 3000

• 300

• 1000

• 8000

If a picture has 16 colours what is the bit depth?

• 16

• 8

• 4

• 2

a file is 32000 bits in size. What is it in kilobytes?

• 32 kB

• 4000 kB

• 4 kB

• 3.2 kB

What is the difference between lossy and lossless compression?

• Lossy keeps the picture resolution the same

• lossless always uses less storage space

• lossy always uses less storage space

• lossless keeps all the dat held in the file