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प्रश्न
What are the main causes of water pollution ? How can it be controlled ?
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उत्तर
Main causes of water pollution are:
- Chemical waste, industrial waste and agricultural processes.
- Thermal waste from nuclear and thermal power plants.
- Sewage and garbage.
Prevention of water pollution:
- Domestic sewage should be treated before being discharged into rivers.
- Using of non-biodegradable substances like detergents should be stopped.
- Trees and plants must be planted along the banks of rivers.
- Purification of water bodies should be carried out.
- The waste products of industries should be treated before they are discharged into rivers.
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संबंधित प्रश्न
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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 |
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snow, rain, clouds, vapour, evaporation, transpiration.
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