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
Answer the following question:
Why is acid added to water before electrolysis ?
What is the importance of dissolved impurities in water?
Complete the statement by filling the blank with the correct word from the option.
The ratio of hydrogen & oxygen in water is ____.
Match the terms in List I with the correct answers in List II.
| List I | List II |
| 1. Solubility in a given solvent decreases with an increase in temperature. | A: Na2SO4.10H2O |
| 2. A white efflorescent crystal | B: NaOH |
| 3. A hygroscopic dehydrating agent | C: Ca(HCO3)2 |
| 4. A deliquescent alkali | D: conc. H2SO4 |
| 5. A substance present in temporary hard water | E: CaSO4 |
True or false? Correct the wrong statement.
We get rainwater throughout the year.
Unscramble the words and fill in the blanks.
- ondencsaonti ______
- vaeionorpat ______
- ecippitatrino ______
Among the given options, which one is not correct for the use of large amounts of fertilisers and pesticides?
Match Column I with Column II
| Column I | Column II | ||
| (a) | Ground water | (i) | Solid form of water |
| (b) | Bawri | (ii) | Wastage of water |
| (c) | Snow | (iii) | Water management |
| (d) | Drip irrigation | (iv) | Small water |
| (e) | Leaking taps | (v) | Water table |
A jumbled word is given here. Write the correct form of the word.
CHARREGE
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.
