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1. Computer Network Computer Network  is an integration of two or more than two computers. It means when computers or their associated devices are connected through a medium is known as a computerork. The medium through which computer systems are connected may be wired or wireless. Figure: Wired Network (all the devices are connected through cable/wire) Figure: Wireless Network (all the devices are connected through Radio Waves) The main objective of Computer Network is to share data/information from one device to another. Network Devices The network devices are devices that help to communicate between computer devices. The most popular network devices are  Network Cables ,  Switch ,  Router ,  Bridge or Hub , etc. 1.1 Network Types The basic types of network types are as follows - LAN MAN WAN PAN i. LAN The  LAN  stands for " Local Area Network" , as its name implies that this type of network is dedicated to a specific geographic area. In the LAN, a group of computers belong

General Properties of Acids and Bases What are Acids and Bases? Acids are chemical substances which are characterized by a sour taste in an aqueous medium.  They have the tendency to turn blue litmus red. On the other hand,  bases are chemical substances which are characterized by a bitter taste and are slippery to the touch.  Some bases are soluble in water while others are not. Water soluble bases are known as alkalis. They have the tendency to turn red litmus blue. Acids and bases react with a wide range of chemical compounds to form salts. Some chemical reactions of acids and bases are: Physical Properties of Acids and Bases The physical properties of acids and bases are listed in the table below. Properties Acids Bases Colour Mineral acids are colourless liquids but sometimes sulphuric acid becomes yellow due to impurities. Some organic acids are white coloured solids. Examples:  benzoic acid Bases are colourless except the hydroxides of iron and copper. Taste Sour Bitter Touch –