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CA chapter 2 notes class 10

COMPUTER APPLICATION.. CLASS-10... CHPATER -2 INTERNET     SERVICES                                             1)Fill in the blanks.   a.        Google is a good example of a Search Engine .   b.       Search engines broadly consist of three components: The Crawler , The Index , The Search Algorithm .   c.        An E-mail program enables you to send, receive and manage your message through the World Wide Web.   d.        Download means to transfer files from the system you have called to the computer you are using. e.        Upload means to transfer files from your hard disk to the Computer System you have accessed by a modem.   f.   News Group   provide a good way to exchang...
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Periodic table

                                   Periodic table ELEMENTS- Elements are pure from of matter that are made up of one type of atom. ·        DOBEREINER- Grouped all elements in three (triads). ·        NEWLAND- Observed that when elements are arranging in increasing order of their atomic mass. Every eighteen element beginning from any element resemble the first element in its physical and chemical properties. ·        DMITRI MENDLEVE- He is a Russian chemist gave the first periodic table of elements based on his law which states that “The properties of elements are the periodic functions of their atomic mass.”   ·        Modern periodic table was given by HENERY MOSELEY. Periodic table- A tabular form of elements in group and periods highlighting the regular trends in...
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Sulphuric acid

                                        Sulphuric acid Sulfuric acid  (alternative spelling  sulphuric acid ), also known as  oil of vitriol , is a mineral acid composed of the elements sulfur, oxygen and hydrogen, with molecular formula H 2 SO 4 . It is a colorless, odorless, and viscous liquid that is soluble in water and is synthesized in reactions that are highly exothermic. Its corrosiveness can be mainly ascribed to its strong acidic nature, and, if at a high concentration, its dehydrating and oxidizing properties. It is also hygroscopic, readily absorbing water vapor from the air.   Upon contact, sulfuric acid can cause severe chemical burns and even secondary thermal burns; it is very dangerous even at lower concentrat...
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