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  Here you can find PDF  files regarding to general knowledge topics of  c ompetitive exams.You can download the pdf files and you can prepare for your exams easily.   WORLD COUNTRIES,CAPITALS AND LANGUAGES WORLD POPULATION 2016 ALL NOBEL PRIZE WINNERS OIL AND GAS REFINERIES IN WORLD SCIENTISTS-INVENTIONS

                   If you are now starting to learn ENGLISH,you first need to know some basic rules of the language.Developing solid foundation in English not only improves your speaking skills but also improves your writing skills.   Learn all the below lessons for getting great grip on this language. BELOW ALL ARE IN PDF TENSES TENSE SELECTION

                                                       ELECTRONICS Definition of electronics:       electronics is a science which deals with the study of flow and control of electrons and the study of their behaviour and effects in vaccum,gases and semiconductors,and with devices using such electrons. A ctually everyone confuses between electronic and electrical.the basic difference between them is simple. electronics deals with the flow of charge through non metal conductors electrical deals with the flow of charge through metal conductors   here non metal conductors means semi conductors .we will see how semi conductors act like non metals below. metals can be classified as insulators ,semiconductors and conductors. INSULATORS: diamond SEMI CONDUCTORS: graphite, germanium and silicon CONDUCTORS: aluminium ,copper   conduction band consists of holes which are positively charged