questions number9,11 and 15
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here is ur answer: 9) Water is ejected in forward directions with a force,it exerts an equal reaction on the hose in backward directions.Due to backward reaction,it is difficult for fire man to hold the hose. Hope this will help you
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Ans. 9) In case of fire before the fireman use the water hoses they shut off the main electric supply for the area because water always contain some dissolve salt which is a good conduct of electricity. If the water fall in the electric current then the fireman will get a sever electric shock.
Ans 11) Electroplating is one of the uses of electrolysis. It is not only used for depositing copper but a number of superior metals. For example handles of bicycle and motorcycles are coated with nickle and chromium so as to give a bright shining appearance
Ans 11) Electroplating is one of the uses of electrolysis. It is not only used for depositing copper but a number of superior metals. For example handles of bicycle and motorcycles are coated with nickle and chromium so as to give a bright shining appearance
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