We are given a set of multiple-choice questions and we need to provide the correct answers.

1. Problem Description

We are given a set of multiple-choice questions and we need to provide the correct answers.

2. Solution Steps

3

5. IP address: An IP address uniquely identifies a device or a website on the internet.

3

6. Useless emails: These are stored in the trash folder.

3

7. URL to IP address: DNS (Domain Name System) is used to convert a URL to an IP address.

3

8. Pixel color amount: If the number of bits for a pixel is four, the color amount is $2^4 = 16$.

3

9. Robot technology tool: Arduino is used to do practical activities using robot technology.

4

0. Social network website: Second Life can be considered a social web site among them.

3. Final Answer

3

5. (4) IP address is used to uniquely identify a device or a web site in internet.

3

6. (3) Trash

3

7. (1) DNS

3

8. (2) 16

3

9. (2) Arduino

4

0. (1) Second life