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प्रश्न
Use of excessive .................... by farmers causes water pollution.
उत्तर
Use of excessive fertilizers by farmers causes water pollution.
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संबंधित प्रश्न
What is the major source of fresh water in the city/town/village where you live?
State the importance of water cycle in nature.
Name the gas produced when steam is passed over hot coke.
Give the importance of dissolved minerals & salts.
Explain the following observation:
Washing-soda become coated with a white powder when left exposed to the atmosphere.
Give a reason for the following:
A crusty ‘boiler scale’ is formed in boilers, when hard water is used.
Differentiate between the following:
Natural water and treated water
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 |
Which are the three states of water?
Match the items of Column I with the items of Column II with reference to sewage.
| Column I | Column II | ||
| (a) | Inorganic impurities | (i) | phosphorus and nitrogen |
| (b) | Organic impurities | (ii) | nitrates and phosphates |
| (c) | Nutrients | (iii) | cholera and typhoid |
| (d) | Bacteria | (iv) | pesticides and herbicides |
