Communication Technologies (OLD) - Test Paper 02

 CBSE TEST PAPER-02

Class-12 Computer Science(Communication Technologies)

General Instruction: -

  • Question No. 1 to 8 carries one marks.
  • Question No. 9 to 10 carry Three marks.               
  1. What is the significance of Cyber Law?
  2. What is web scripting?
  3. Write one advantage and one disadvantage of following network topologies in network : (i) BUS Topology, (ii) STAR Topology
  4. Write two characteristics of Web 2.0.
  5. Define Mobile Communication and Wireless Communication.
  6. Write short notes on the following :
    (i) GSM (ii) CDMA (iii) WLL (iv) 3G (v) SMS (vi) EDGE
  7. Write two advantages of 3G over 2G Mobile Telecommunication Technologies in terms of speed and services?
  8. Categories the following under Client side and Server Side script category?
    (i) JavaScript
    (ii) ASP
    (iii) VB Script
    (iv) JSP
  9. Out of the following, which is the fastest (i) wired and (ii) wireless medium of communication?
    Infrared, Co‐axial Cable, Ethernet Cable, Microwave, Optical Fiber
  10. Knowledge Supplement Organisation has set up its new center at Mangalore for its office and web-based activities. It has 4 blocks of buildings as shown in the diagram below:

    Center to center distances between various blocks

    Block A to Block B50 m
    Block B to Block C150 m
    Block C to Block D25 m
    Block A to Block D170 m
    Block B to Block D125 m
    Block A to Block C90 m

    Number of Computers

    Black A25
    Block B50
    Block C125
    Block D10

    i. Suggest a cable layout of connections between the blocks.
    ii. Suggest the most suitable place (i.e. block) to house the server of organisation with a suitable reason.
    iii. Suggest the placement of the following devices with justification
    - Repeater
    - Hub/Switch
    iv. The organization is planning to link its front office situated in the city in a hilly region where the cable connection is not feasible, suggest an economic way to connect it with reasonably high speed?

CBSE TEST PAPER-23
Class-12 Computer Science(Communication Technologies)
[Answers]

  1. Cyber law encompasses a wide variety of political and legal issues related to the Internet and other communications technology, including intellectual property, privacy, freedom of expression, and jurisdiction.
  2. A script is a small bit of code that enables web browsers to do something rather than just displaying static results. Scripts are used in web design to create dynamic pages. There are 2 categories of Web script Client-Side Script which can be written by using JavaScript, VB Script and Server Side Script which can be written in PHP, JSP
  3.  
    BUS TopologySTAR Topology
    Advantage : 
    *Simple architecture.*Easy to detect faults and to remove parts.
    Disadvantage : 
    *Breakage of wire at any point disturbs*Expensive as compared to Bus Topology the entire network.
  4. (Write any two)
    - Makes web more interactive through online social media
    - Supports easy online information exchange
    - Interoperability on the internet
    - Video sharing possible on the websites
  5. Mobile Communication essentially refers to a computing device that is not continuously connected to the base or central network. This may include laptops, newly created smartphones and also PDA’s. Wireless Communication is simply data communication without the use of a landline. This may involve a cellular telephone, a two-way radio, a fixed wireless connection, a laser, or satellite communications.
  6. i) GSM (Global System for Mobile Communications): It is leading digital cellular system. In covered areas, cell phone users can buy one phone that will work anywhere the standard is supported. It uses narrowband TDMA, which allows eight simultaneous calls on the same radio frequency.
    ii) CDMA (Code Division Multiple Access): It is a digital cellular technology that uses spread-spectrum techniques. CDMA does not assign a specific frequency to each user. Instead, every channel uses the full available spectrum.
    iii) WLL (Wireless in Local Loop): WLL is a system that connects subscribers to the public switched telephone network using radio signals as a substitute for other connecting media.
    iv) 3G: 3G is a specification for the third generation of mobile communication of mobile communication technology. 3G promises increased bandwidth, up to 384 kbps when a device is stationary.
    v) SMS (Short Message Service): SMS is the transmission of short text messages to and from a mobile phone, fax machine and or IP address.
    vi) EDGE (Enhanced Data rates for Global Evolution):  EDGE is a radio based high-speed mobile data standard.
  7. Speed ‐ Faster web browsing
    Faster file transfer
    Service ‐ Better video clarity
    Better security
  8. Client Side Scripts Server-Side Scripts
    VB Script ASP
    JavaScript JSP
  9. (i) Wired – Optical Fiber
    (ii) Wireless ‐ Infrared OR Microwave
  10. i. Layout

    ii. The most suitable place/block to house the server of this organisation would be Block C, as this block contains the maximum number of computers.
    iii. According to the above layout,  since the distance between Blocks A and C is large so a repeater would ideally be placed in between this path. A hub/switch each would be needed in all the blocks, to interconnect the group of cables from the different computers in each block.
    iv. The most economic way to connect it with a reasonable high speed would be to use radio wave transmission, as they are easy to install, can travel long distances, and penetrate buildings easily, so they are widely used for communication, both indoors and outdoors. Radio waves also have the advantage of being omnidirectional, which is they can travel in all the directions from the source so that the transmitter and receiver do not have to be carefully aligned physically.