12th Standard CBSE Computer Science Unit 7 Communication Technologies Model Question Paper | QB365

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12th Standard CBSE Computer Science Unit 7 Communication Technologies Model Question Paper

Published on: 03/08/2019

Communication Technologies

Download CBSE Class 12th Standard CBSE Computer Science question papers, sample papers, important questions, and previous year solved papers in PDF format. Get free study materials, NCERT solutions, and exam preparation resources for Class 12th Standard CBSE Computer Science

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Std: 12th Standard CBSE - Computer Science

chapter: - Model Question paper

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Questions:

Fill up / 1 Marks

18 x 1 = 18

What is web 2.0?

Name on client-side scripting language and one server-side scripting language.

What is the difference between virus and worm in the computer?

Expand the following abbreviations:

(i) HTTP (ii) VoIP

What out of the following you will use to have an audio visual chat with an expert sitting a far away place to fix-up technical issues?

(i) E-mail (ii) Volp

(iii) FTP

Which of the following crime(s) is/are covered under cyber crime?

(i) stealing brand new hard disk a shop.

(ii) getting into unknown person's social networking account and start messaging on his behalf .

(iii) Copying some important data from a computer without taking permission from the owner of the data.

How is an E-mail different from a chat?

Write two characteristics of wifi.

Expand the following :

(i) GPRS

(ii) CDMA

(iii) GSM

10.

What is the difference between video conferencing and chat?

11.

Write one characteristic each for 2G 3G mobile technologies.

12.

What is modem?

13.

what is difference between star topology and bus topology of network?

14.

What is the advantage of using SWITCH over HUB?

15.

What is a protocol? Which is used to search information from internet using an internet.

16.

Expand the following abbreviations:

(i) HTTP (ii) ARPANET

17.

Write one advantage of bus topology of the network. Also, illustrate how four computers can be connected with each other using star topology of network?

18.

Which of the network (out of LAN, PAN and MAN) is formed, When you connect two mobiles using Bluetooth to transfer a picture file?

Generic 4

1 x 4 = 4

19.

Trine Tech Corporation (TTC) is a professional consultancy company. the company is planning to set up their offices in India with its hub at Hyderabad. As a network advisor, you have to understand their requirement and suggest them the best available solutions. Their queries are mentioned as (i) to (iv) below.
Block to block distance(in m)

Block (From)	Block(To)	Distance
Human Resource	Conference	110
Human Resource	Finance	40
Conference	Finance	80

Expected number of computers to be in each block

Block	Computers
Human Resource	25
Finance	120
Conference	90

(i) Which will be the most appropriate block, where TTC should plan to install their server?
(ii) Draw a block to block cable layout to connect all the building in the most appropriate manner for efficient communication.
(iii) What will be the best possible connectivity out of the following, you will suggest to connect the new setup of offices in Bangalore with its London based office.

Satellite link
Infrared

(iv) Which of the following device will be suggested by you to connect each computer in each of the buildings?

Switch
Modem
Gateway

Generic 2

1 x 2 = 2

20.

Explain the following terms in short:
(i) DHTML
(ii) ISP

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Answers Key:

Fill up / 1 Marks

18 x 1 = 18

()
Web 2.0 is associated with a web application that facilitates participatory information sharing. interoperability user-centered design and collaboration on the world wide web. It allows the user to interact and collaborate with each other in a social media dialogue as creators of user-generated content in a virtual community.

()
Client-side scripting language-VB script

Server-side scripting language-ASP

()
The main difference between virus and worm is the method by which they reproduce and spread. A virus is dependent upon the last life of boot sector and the transfer of files between machines to spread, while a worm can run completely independent and spread itself through a network connection.

()
(i) HTTP HyperText Transfer Protocol.

(ii) VoIP Voice over Internet Protocol

()
(ii) Volp

()
(ii) Getting into unknown person's social networking account and start messaging on his behalf.

()
In order to chat, you need have an account on the same service as the person you are chatting with.e.g.on the other hand, in case of E-mail, it is not necessary,i.e. you can have an account from any provider and you can establish your own.

()
Characteristics of Wi-Fi are as follows:

(i) It is a wireless solution for getting connected to the Internet.

(ii) It is handy as well as available throughout the journey.

()
(i) GPRS General Packet Radio Services

(ii) CDMA Code Division Multiple Access

(iv) GSM Global System for Mobile Communication

10.

()
Chat generally involves one-to-one communicatio. On the other hand, video conferencing means more than two persons are involved in a discussion.

11.

()
Characteristics of 2G mobile technology is that, it has introduced data services for mobile, starting with text messenging.

Characteristics of 3G mobile technology is that is faster than 2G suppotrs video calling.

12.

()
A modem is a data communication equipment that facilitates data communication through telephone lines. It is used to convert digital data into analog and vice-versa.

13.

()
In star topology, nodes are connected to server individually whereas in bus topology all nodes are connected to server along a single length of cable.

14.

()
Switch provides a dedicated line at full bandwidth between two devices but hub doesn't provide a dedicated line. Hub share the banndwidth.

15.

()
Protocol is a set of rules that two or more computers must follow to communicate on network.

WWW (World Wide Web) is used for searching information from Internet browser.

16.

()
HTTP HyperText Transfer Protocol.

ARPANET Advanced Research projects Agency Network.

17.

()
Advantage of bus topology In bus topology, computers can be connected with each other using server (host) along a single length of cable.

Four computers can be connected with each other using server in the following way:

18.

()
When two mobiles are connected using Bluetooth to transfer a picture file, a PAN(Personal Area Network) is created.

Generic 4

1 x 4 = 4

19.

(i) TTC should install its server in finance block as it is having a maximum number of computers.
(ii) The above layout is based on maximum cable length required, which is 120 meters in the above case.
(iii) Satellite Link
(iv) Switch.

Generic 2

1 x 2 = 2

20.

(i) DHTML DHTML stands for Dynamic HyperText Markup Language. It refers to the web content that changes according to the user request. It will react the user input without sending requests to the web server.

(ii) ISP ISP stands for Internet Service Provider. It refers to the company that provides Internet Services. Some common examples of ISPs are Airtel, BSNL, Tata docomo, etc.