O-Level Computing (7155) Data Representation quiz: binary, hexadecimal, binary addition, overflow, storage units, compression, media encoding quiz

Electronic components have two stable states that map onto 0 and 1

Binary numbers are shorter than denary numbers

Binary can store decimal points more accurately

Humans find binary easier to read than denary

7

11

13

23

2

8

4

16

It lets the computer run faster

It is the only base a CPU can process

It uses less storage than binary

It is a compact, readable shorthand for binary

FF

F0

88

256

00011100

00011110

00111100

00001111

1001

0111

1000

1100

When two binary numbers are equal

When a register is empty

When a number is converted to hexadecimal

When the result is too large to fit in the fixed number of bits available

8

4

1

16

It permanently removes detail to shrink the file

It keeps all the original data so the file can be restored exactly

It can only be used on images

It always produces a smaller file than lossy compression

A program's executable file

A document of source code

A photograph shared online

A spreadsheet of exam marks

A pixel colour

A file size in bytes

A sound sample

A single text character (capital A)

By sampling its amplitude at regular intervals and storing each sample as a binary number

As a grid of pixels

As an ASCII string

By rounding it to the nearest hexadecimal digit

Sample rate and bit depth

Resolution (number of pixels) and colour depth (bits per pixel)

Clock speed and number of cores

Lossless and lossy compression only