Sample Paper – 2012 Class – X Subject – SCIENCE

Jun 30th, 2015
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One mark Questions 1. Focal length of concave lens is 50cm find its power? 2. Write Functional Groups of Alcohol and Aldehyde

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History of InternetContentIntroductionCreation of ARPANETFrom ARPANET to InternetFrom Internet to the World Wide WebDevelopment of the World Wide WebQuestionsCreation of ARPANET (1)1957 USSR launched Sputnik IUnited States were shockedAdvanced Research ProjectsAgencyThechnological think-tankSpace, ballistic missiles and nucleartest monitoringCommunication between operationalbase and subcontractersCreation of ARPANET (2)1962 computer research programLeaded by John Licklider (MIT)Leonard Kleinrock published his first paper onpacket-switching theory1965 first wide area network createdConnection between Berkeley and MITCreation of ARPANET (3)1967 plans for ARPANETwere published1969 Interface MessageProcessor (IMP)MIT NPL (UK) RAND4 computers (UCLA, SRI,UCSB and UTAH)1971 23 host computers(15 nodes)From ARPANET to Internet (1)1972 ARPANET went publicICCCFirst program for person-to-person communication(e-mail)197375% of all ARPANET traffic is e-mailFirst international connection (University College ofLondon)From ARPANET to Internet (2)1974 TCP/IPEach network should work on its ownWithin each network there would be a gatewayPackages would be routed through the fastestavailable routeLarge mainframe computersSev

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