Units and Data Storage

Question 1

What is a bit?

Answer 1

1 bit

The smallest unit of data in computing.

Question 2

What is a nibble?

Answer 2

4 bits

Commonly used in computing as a half-byte.

Question 3

What is the size of a byte?

Answer 3

8 bits

A byte is a fundamental unit of data storage.

Question 4

How many bytes are in a kilobyte?

Answer 4

1000 bytes

Equivalent to 8 thousand bits.

Question 5

How many kilobytes are in a megabyte?

Answer 5

1000 kilobytes

Equivalent to 1 million bytes or 8 million bits.

Question 6

How many megabytes are in a gigabyte?

Answer 6

1000 megabytes

Equivalent to 1 billion bytes or 8 billion bits.

Question 7

What is the size of a terabyte in bytes?

Answer 7

1000 gigabytes

Equivalent to 1 trillion bytes or 8 trillion bits.

Question 8

How many terabytes are in a petabyte?

Answer 8

1000 terabytes

Equivalent to 1 quadrillion bytes or 8 quadrillion bits.

Question 9

What is the size of an exabyte?

Answer 9

1000 petabytes

Equivalent to 1 quintillion bytes or 8 quintillion bits.

Question 10

How many exabytes are in a zettabyte?

Answer 10

1000 exabytes

Equivalent to 1 sextillion bytes or 8 sextillion bits.

Question 11

What is the size of a yottabyte?

Answer 11

1000 zettabytes

Equivalent to 1 septillion bytes or 8 septillion bits.

Question 12

How many zettabytes are in a brontobyte?

Answer 12

1000 yottabytes

Equivalent to 1 octillion bytes or 8 octillion bits.

Question 13

What is a geopbyte?

Answer 13

1000 brontobytes

Equivalent to 1 nonillion bytes or 8 nonillion bits.

Question 14

Calculate the size of a text file with 1000 characters at 1 bit per character.

Answer 14

125 bytes

Calculation: 1000 bits / 8 = 125 bytes.

Question 15

What is the formula for calculating the size of image files?

Answer 15

Colour depth * image height * image width

Colour depth is the number of bits available to store.

Question 16

Calculate the size of an image with dimensions 100 x 300 pixels and a depth of 2.

Answer 16

7500 bytes (7.5 KB)

Calculation: 100 * 300 * 2 = 60000 bits, 60000 / 8 = 7500 bytes.

Question 17

What is the formula for calculating the size of sound files?

Answer 17

Sample rate * duration * bit depth

Sample rate is the number of samples per second.

Question 18

Calculate the size of a sound file with a bit depth of 2, taking 10 samples per second for 30 seconds.

Answer 18

75 bytes

Calculation: 30 * 10 * 2 = 600 bits, 600 / 8 = 75 bytes.

Question 19

What is binary?

Answer 19

A number system made up of 0 and 1

It is a base two number system used in computing.

Question 20

Why is binary used in computers?

Answer 20

Because a CPU is made up of millions of transistors that can be in one of two states (on/off)

This allows for the representation of data.

Question 21

What is binary addition for 1 + 1?

Answer 21

0 carry 1

This represents an overflow in binary addition.

Question 22

What is an overflow error in binary?

Answer 22

An extra carry/bit when the result exceeds 8 bits

The result exceeds 255 (11111111 in binary).

Question 23

How do you multiply in binary using shift?

Answer 23

Shift all numbers to the left

Each place moved represents a multiplier of 2.

Question 24

How do you divide in binary using shift?

Answer 24

Shift all numbers to the right

Each place moved represents a division by 2.

Question 25

What happens to the far left digit when multiplying in binary?

Answer 25

It is dropped ## Footnote The far right digit is replaced by a 0.

Question 26

What happens to the far right digit when dividing in binary?

Answer 26

It is dropped ## Footnote The far left digit is replaced by a 0.

Question 27

What are the types of character sets?

Answer 27

ASCII and Unicode ## Footnote ASCII = American Standard Code for Information Interchange

Question 28

What is a character set?

Answer 28

the number of possible characters that can be represented in a computer system

Question 29

How does ASCII work and what is it useful for? How is each character stored?

Answer 29

allows the computer to understand the characters that have been typed by a human Each character is given a unique binary code and that is how the computer can represent the correct character Each character is stored in 8-bit

Question 30

How much space does ASCII take up and how many characters are there?

Answer 30

1 byte for the whole english language 255 possible characters

Question 31

Why was Unicode developed?

Answer 31

to account for every language in the world. An example of this would allow a user from any country to select their language when setting up an operating system. The Unicode character set would account for every language

Question 32

How much space does Unicode take up and how many characters are there?

Answer 32

It uses 2 bytes(16 bits) that gives us 2^16 possible characters(65,536)

Question 33

What's metadata?

Answer 33

data about the data

Question 34

What metadata is looked for when a multimedia file opens?

Answer 34

The format of the file Height Width File size Date Geo location Author Colour depth of the file

Question 35

What 2 ways do you refer to an image?

Answer 35

colour depth/ bit depth resolution

Question 36

What is colour depth/ bit depth of a file?

Answer 36

the number of bits per pixel The higher your colour depth, the higher your image quality but the file size is bigger

Question 37

What is resolution of a file?

Answer 37

the number of pixels in the same sized area The higher the resolution, the higher the image quality is but bigger the file size