Advertisements
Advertisements
प्रश्न
Explain rain water harvesting.
Explain the following:
Rain water harvesting
Advertisements
उत्तर
It is a technique of collecting, storing, and reutilizing rainwater. Special water-harvesting structures are made for this purpose, such as wells, percolation pits, dams and lagoons. This technique is very useful in the regions where there is water scarcity or where rainfall does not occur. It maintains a supply of water during the dry months of the year.
संबंधित प्रश्न
Explain how the peculiar variation of density of water with temperature can protect marine-life.
Answer the following question:
Why is acid added to water before electrolysis ?
State the importance of the solubility of CO2 and O2 in water.
Explain why:
If distilled water is kept in a sealed bottle for a long time, it leaves etchings on the surface of the glass.
What do you understand by permanent hardness?
Give the importance of dissolved minerals & salts.
Select the correct answer of the following statement:
A solution which can pass through a filter paper but not through a semipermeable membrane.
Name one substance which is ‘deliquescent’.
What happens when a spoonful of sugar, sawdust, and soil are added to a glass of water?
Fill in the blanks in the following statements using words given in the box.
| air, handpumps, cholera, water, large, ground |
A very ______ number of our people defecate in the open. It may cause ______ pollution and soil pollution. Both the surface water and ______ water get polluted. ______ water is the source for wells, tubewells and ______. Thus it becomes the most common route for ______ borne diseases like ______, dysentery, etc.
