Methods to Purify Water
Methods to Purify Water
Different Methods are used to make water safe for drinking.
1. By Boiling: Water can be boiled for few minutes, to kill the germs present in it.
2. By Filtration: Water can be passed through candle filters made of porcelain. Most of the bacteria are trapped in this way.
3. By exposing water to UV Rays: An ultraviolet (UV) filter is fitted directly to the tap. Water from the tap passes through this filter. Ultraviolet light act on the water and kills the germs.
4. By Treating with Chemicals: Potassium permanganate are put into the water. Potassium permanganate is a germicide. It kills the germs.
5. If large amount of fluoride salt is present in water it is treated by lime. Excess fluoride in water causes defects in bones.
Municipal authorities remove all harmful constituents and make water safe for use before supplying to towns and cities. Chlorination is done by adding chlorine tablets or bleaching powder to the water. It kills disease germs.
Choose the incorrect matched statement: | |||
| Right Option : B | |||
| View Explanation | |||
Which of the following are correct : (a) Water can be boiled for few minutes, to kill the germs present in it. (b) Water can be freeze for few minutes, to kill the germs present in it. (c) Water can be passed through candle filters made of porcelain. Most of the bacteria are trapped in this way. | |||
| Right Option : C | |||
| View Explanation | |||
Which of the following are correct : (a) Ultraviolet light act on the water and kills the germs. (b) Water can be boiled for few minutes, to kill the germs present in it. (c) Potassium permanganate | |||
| Right Option : D | |||
| View Explanation | |||
Students / Parents Reviews [20]
My experience with Abhyas academy is very nice or it can be said wonderful. I have been studying here from seven class. I have been completing my journey of three years. I am tinking that I should join Abhyas Academy in tenth class as I am seeing much improvement in Maths and English
Hridey Preet
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Barkha Arora
10thAbout Abhyas metholodology the teachers are very nice and hardworking toward students.The Centre Head Mrs Anu Sethi is also a brilliant teacher.Abhyas has taught me how to overcome problems and has always taken my doubts and suppoeted me.
Shreya Shrivastava
8thWe started with lot of hope that Abhyas will help in better understnding of complex topics of highers classes. we are not disappointed with the progress our child has made after attending Abhyas. Though need to mention that we expected a lot more. On a scale of 1-10, we would give may be 7.
Manya
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Manish Kumar
10thIn terms of methodology I want to say that institute provides expert guidence and results oriented monitering supplements by requsite study material along with regular tests which help the students to improve their education skills.The techniques of providing education helps the students to asses...
Aman Kumar Shrivastava
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Aman Kumar Shrivastava
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Archit Segal
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Prisha Gupta
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Aman Kumar Shrivastava
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Ayan Ghosh
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Om Umang
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Hiya Gupta
8thIt has a great methodology. Students here can get analysis to their test quickly.We can learn easily through PPTs and the testing methods are good. We know that where we have to practice
Barkha Arora
10thAbhyas institute is one of the best coaching institute in the vicinity of Ambala cantt.The institute provides good and quality education to the students.The teachers are well experienced and are very helpful in solving the problems. The major advantages of the institute is extra classes for weak...
Shreya Shrivastava
8thUsually we see institutes offering objective based learning which usually causes a lag behind in subjective examinations which is the pattern followed by schools. I think it is really a work of planning to make us students grab the advantages of modes of examination, Objective Subjective and Onli...
Anika Saxena
8thIt was a good experience with Abhyas Academy. I even faced problems in starting but slowly and steadily overcomed. Especially reasoning classes helped me a lot.
