XI Computer Science

Note: Attempt Five question in all including the compulsory question No.1 which carries 10 marks.Select Two question from each section.

Q.1) Choose the correct answer for each from the given options : ( 10 )
(i) 1 Gigabyte (GB) data is equivalent to:

• 1024 Kilobyte
• 1024 Bytes
• 1024×1024 Kilobytes
• 1024 Megabytes.

(ii) Select the simplest topolgy from the following:

• Bus topology
• Star topology
• Token ring topology
• FDDI topology.

(iii) A device that provides the network with a single point of contact for all other devices is called:

• Hub
• Router
• Bridge
• Repeater.

(iv) Which markup Language is used to produce web pages?

• WML
• HTML
• XML
• SGML

(v) Which one of the following is not a visual IDE?:

• Visual Basic
• Visual C++
• Delphi
• COBOL

(vi) A term used to describe the maximum speed at which a given device can transfer data is :

• Buffer
• Routing
• Bandwidth
• Cache.

(vii) ASCII is the abbreviation of:

• Application Software Code of Information Interchange
• American Standard Code of Information Interchange
• American System Code of Information Interchange
• American Symbolic Code of Information Interchange.

(viii) Every HTML document is stored on URL,also known as:

• ftp server
• Http server
• Proxy server
• WWW server

(ix) A software that enables users and applications to interact with the computer hardware is called:

• Operating System
• Application Software
• Client Software
• Database Management System

(x) Which part of CPU perform all arithmetic and logic calculations on data it receives?:

• Control Unit
• Main memory unit
• Arithmetic logic unit (ALU)
• Read only memory

SECTION “A”

Q.2a) Differentiate between Sequential Access,Cyclical Access and random Access devices? ( 5 )
(b) What does term memory refer to? ( 5 )
(c) Write names of commonly used INPUT and OUTPUT devices and briefly describe the functions of these devices. ( 5 )

Q.3a) What is an OSI model? How many layers does it consist of?
Name these layers .Explain the functionality of any three of them. ( 5 )
(b) What is meant by Network Topology?How many kinds of topologyies exist?explain each topology briefly. ( 5 )
(c) Differentiate between Desktop Operating System and Network Operating System.Write an account of Windows Operating System. ( 5 )

Q.4a) What are the advantages and disadvantages of data communication? ( 5 )
(b) Define the term Data .Explain Data Validation.How are different types of data encoded? ( 5 )
(c) What is Computer Virus? Explain different kinds of viruses and the damage caused by them .Write the methods to prevent from such damages. ( 5 )

Q.5a) Write short notes on Three of the following : ( 15 )
(i) Word processor
(ii) Spread sheet
(iii) High level programming Language
(iv) LAN (Local Area Network)
(v) Network protocols
(vi) Network devices.

SECTION “B”

Q.6a) Which of the following are correct URLs?: ( 5 )
(i) http://www.ebay.com
(ii) http://www.jang.com.pk
(iii) http://www.news@usa.com
(iv) ftp://www.download.com
(v) http://www/mynews.com:80
(vi) telnet://www.ucla.edu
(vii) http://www/poetry.com/poets/sahir.html
(viii) http://www/poetry.com/poets/sahir.htm
(ix) gopher://gopher.ucla.adu
(x) http://security.secure.com
(b) Define Internet .What are the benefits of E-mail? ( 5 )
(c) Differentiate the following: ( 5 )
(i) FTP and HTTP
(ii) LAN and WAN

Q.7a) Answer any Five of the following: ( 5 )
(i) What is meant by data protection and privacy of data?
(ii) What is a Server Software?
(iii) What does the Router do?
(iv) What is a Register?
(v) Draw the block diagram of computer.
(vi) What is a Newsgroup?
(vii) What is co-axial cable?
(b) What is a Web browser ? Name the two most popular and extensively used web browsers. ( 5 )
(c) Define and explain any two of the following: ( 5 )
(i) Ethernet card
(ii) World Wide Web
(iii) IP address
(iv) Web search engine

Q.8a) What is the function of a MODEM? Write the different types of modems available. ( 5 )
(b) What do the following terminologies stand for? ( 5 )
(i) IDE
(ii) GUI
(iii) IEEE
(iv) XML
(v) WAP
(c) What is the importance of Data backup? List the names of backup devices. ( 5 )