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Ans.  a.   MODEM (Modulator Demodulator) is a device used to convert the digital signals into analog signals and vice versa. It is
                 mainly used to connect a telephone to a computer terminal.
               b.  URL (Uniform Resource Locater) is the unique address of a web page located on the internet.
               c.  HTML (Hypertext Markup Language) is the basic language used to design web pages with hypertext and hyperlinks.
               d.   World Wide Web (WWW) was designed by Tim Berner Lee in 1989. It is a system of interlinked hypertext documents
                 that are accessed via the internet.
          12.  What is 4G?
          Ans.   Fourth Generation (4G) of cellular service has integrated features of 3G with Internet compatibility to support wireless
              mobile Internet, as the data transmission speed in Standard 4G (or 4G LTE) is around five to seven times faster than 3G.
              4G provides same features as 3G but with high data transfer speed. It provides data transfer speed around 150Mbps. It
              enables for flawless service in applications like wireless broadband access, Multimedia Messaging Service (MMS), video
              chat, mobile TV, HDTV content and Digital Video Broadcasting (DVB).
                                                                                    21 st   #Communication
        C.  Competency-based/Application-based questions:                        Century   #Leadership & Responsibility
                                                                                   Skills
           1.  Due to the pandemic everyone was bound to stay at home. But due to the internet the whole world was connected.
               a.  What is meant by World Wide Web? Also write any two web browsers that you know.
               b.  Explain how data is transferred over internet.
          Ans.  a.    "A web browser, or simply 'browser,' is an application used to access and view websites. Common web browsers include
                 Microsoft Edge, Google Chrome, Mozilla Firefox, and Apple Safari.
               b.   Data sent over the internet is called a message, but before messages get sent, they're broken up into tinier parts
                 called  packets.  These  messages  and  packets  travel  from  one  source  to  the  next  using  Internet  Protocol  (IP)  and
                 Transmission Control Protocol (TCP).
           2.  Amit has applied for a job. He got a call for an interview through video conferencing.
               a.  Video conferencing is an example of        .
               b.  Write its three important features.
               c.  Explain its two types.
          Ans.  a.   Instant Messaging Software
               b.   Its three important features are:
                  i.  Provides private and secure online chat.
                  ii.  Text Messages can be sent to one or more person.
                  iii.  Provides audio and video calling and conferencing.
               c.  Its two types are:
                  i.   Application  based instant messaging software:  are  freely  available  and  can be easily installed  on  devices like
                    smartphones, computers, touchpads etc.
                  ii.   Web based instant messaging software: accessed using browsers such as Microsoft Edge, Mozilla Firefox, Google
                    Chrome, etc.
           3.  Rohan has set up a small business in his basement. His 5 employees want to inter-connect their computers so that data can
              be easily shared.
               a.  Suggest the suitable type of network for his small business in the basement of his house.
               b.  Give two advantages of connecting to a network.
               c.  Which application software will help them browse the internet?
               d.  How can they get an internet connection?
          Ans.  a.  Local Area Network
               b.  The two advantages are:
                  i.   File sharing: You can share files like text files, spreadsheets, documents, presentations, audio files, video files, etc.
                    amongst different users and access the file from any location if devices are interconnected.
                  ii.   Data Sharing: Data can be easily shared, sent and received through network.
               c.  Web browsers like Microsoft Edge, Google Chrome, etc.
               d.  Airtel, Jio or any other ISP



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