# 07 - Units of Information (how we get memory)

1. What is a bit?
`note: If you are able to, give this video a watch. It will provide a context for this quiz and units of information. `

The smallest unit of data in a computer

A 0 or a 1

All of the given options are valid

A binary digit

2. A bit has a single binary value -either 0 or 1

FALSE

TRUE

3. The value of a bit is usually stored as either above or below a designated level of electrical charge in a single capacitor within a memory device.

TRUE

FALSE

4. A group of four bits, or half a byte, is sometimes called a ____________________

byte or bit

kilobyte or megabyte

terrabyte or gigabyte

nibble or nybble.

5. 1 byte refers to …

5 bits

1 bit

8 bits

2 bits

6. 1 byte can be used to store

one mp3 song

114 minutes of DVD Video

a number from 0 to 255

page of text from a novel

7. This shows a memory stick with….

16 bytes of memory

No memory

16 GB of memory

32 bits of memory

8. bits, bytes, megabytes, gigabytes, terabytes etc are all used to…

hold the parts of a computer together

perform calculations and store memory

describe disk space, data storage or the capacity of system memory

create the mother board

9. A bit can be used to:

store a single number up to the value of 255

hold the answer to a yes/no or true/false question

store a single number up to the value of 55

store a single letter like A

10. A byte can be used to

store a number from 0 to 255543474562

None of these options are valid answers

store a word like 'CAT'

store a single letter like A

11. The symbol for byte is uppercase B. 16 bytes would be written as

16Bi

16MB

16B

16BYTES

12. A kilobyte is thought of as approximately 1000 bytes but to be accurate it is:

102 bytes

12 bytes

2024 bytes (which is 2 to the power of 10)

1024 bytes (2 to the power of 10)

13. Have a look at the table below which shows the units of information leading to memory. Fill in the blanks

None of the above

1024 TB

1000 Bytes

1024 GB

14. Look at the wikipedia list of sizes with examples below. What is the blank most likely to be?

A large hard drive

A Music file (e.g. mp3)

A CD-ROM

15. A 1TB hard disk could hold about….

half of a high definition movie (You would need 2TB to store a full movie)

20,000 complete high definition movies

150 complete high definition movies

1 complete high definition movie

16. A petabyte is equivalent to 1024 Terabyes. Which of the statements is true?

A petabyte is a unit of information equal to one thousand million

Approximately 10 million photos that exist on Facebook amount to 10000 petabytes worth of data

According to CISCO, in 2016 internet traffic for the whole world was approximately 0.3 petabytes per day!

Data centers and super computers used petabytes of memory

17. With over a billion daily active users, Facebook is the third-busiest site on the internet, according to Alexa. Which statement is true?
```Some interesting facts about Facebook
======================================
Facebook's system processes 2.5 billion pieces of content
and 500+ terabytes of data each day.

It's pulling in 2.7 billion Like actions and 300 million photos
per day, and it scans roughly 105 terabytes of data each half hour.```

It's estimated that they have over 1 trillion bits of storage, growing by several million bits per day

It's estimated that they have approximately 100TB of storage as of 2018

It’s estimated that they have over 200 petabyte of storage, growing by several terabytes a day.

It's estimated that they have about 200,000 kilobytes of storage, growing by 1 million bits per day

18. An MP3 music track is about:

3 - 5 MB

1000 bits

1 - 100 KB

1 - 3 KB

19. A typical high definition movie is about:

10,000 bits

5GB

256 TB

120 KB

20. A single text character (like 'E') can be stored in….

128 bytes minimum

a byte

a bit

1GB (typically 1GB is needed per character)