Class 8 Computer Science Notes, Unit 1: ICT Fundamentals -- Exercise Short Response and Miscellaneous (within the chapter) Questions and Answers

Class 8 Computer Science Notes

Unit-1 

"ICT Fundamentals"

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Class 8 Computer Science MCQs (All Units Exercise) 

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1. Exercise Short Response Questions and Answers:

Q1. Differentiate between LAN and WAN.? 

Ans:

LAN	WAN
1. LAN covers a limited area	1. WAN covers a large geographical area
2. Data transfer speed is faster	2. Data transfer speed is slow in WAN
3. LAN is inexpensive	3. WAN is expensive
4. LAN is usually connected through wires.	4. WAN is usually connected through telephone lines

Q2. What are the benefits of using networks?

Ans:

Benefits of networks:

1.   Computer networks are used to share hardware.
2.  Computer networks are used to share software.
3.  Networks are used to share data and programs.
4.  Networks are used to share a single internet connection.
5.  Used to communicate with different people around the world

Q3. What is the role of the network switch?

Ans:

Network switch:

it is a network device that allows computers in a network to connect with one another using wired communication. It transmits the message directly to the destination computer. It maintains a table (MAC) for forwarding data

Q4. Differentiate between wired and wireless networks.

Ans:

WIRED NETWORK	WIRELESS NETWORK
1. Wired required a physical path for transmission.	1. Wireless does not require a physical path for transmission.
2. Wired network is more secure	2. Wireless network is less secure
3. Wired network is faster	3. Wireless network is slower than a wired network
4. twisted pair, coaxial, and fiber optic medium is used in a wired network.	4. Satellite and microwave  communication media is used in wireless networks.

Q5. List different tasks that can be performed by robots?

Ans:
There are different tasks performed by robots. Robots are widely used in automobile manufacturing, Packaging, laboratory research, and cleaning home.

Q6. Why distributed applications are used? List some distributed applications?

Ans: 

It is used when the workload is too much for a single server to handle. Some example of distributed applications is cellular networks, online banking, social networks, supermarket check-out system, etc.

Q7. What is the purpose of blockchain technology?

Ans: 
Purpose of blockchain:
It is a type of database that provides a secure digital information recording. The blockchain database is used in banks and financial services for the secure recording and sharing of digital information such as transactions.

Q8. Describe 3D Holographic imaging?

Ans: 

3D Holographic imaging is a new technology that uses laser beams to create three-dimensional images called holograms. A 3D Hologram displays objects and animations that seem to be real. A 3D Hologram exists freely in space; a person can walk around it and see it from all sides.

2. Miscellaneous Questions and Answers (Within the Unit):

Q1.  Write the difference between PAN and VPN.

Ans:

PAN	VPN
1. Stands for Personal Area Network	1. Stands for Virtual Private Network
2. PAN is an interconnection of electronic devices within an individual person’s workplace.	2. VPN allows the user to access the web privately and securely through VPN gateway.
3. Provide communication over short distances.	3. Provide communication over long distances.

Q2.  In which applications infrared technology is used?

Ans:

Some applications are:

• It is used in a TV remote. 
  
• It is used in the car locking system.  
  
• It is used in electronic toys etc.

Q3.  Write the benefits of wireless communication:

Ans:.
Benefits of wireless communication:

• Easy to install and easy to maintain.
• Users can communicate while on the move.
  
• Provides faster transfer of information.
• Easy to expand the network.

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