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.
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 is used to clean water in modern filters? | |||
Right Option : C | |||
View Explanation |
Which of the following method can be used to purify water ? | |||
Right Option : D | |||
View Explanation |
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Third consective year,my ward is in Abhyas with nice experience of admin and transport support.Educational standard of the institute recumbent at satisfactory level. One thing would live to bring in notice that last year study books was distributed after half of the session was over,though study ...
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Usually 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...