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प्रश्न
The ultimate source of all water on the earth is
विकल्प
oceans and seas
spring and wells
rivers and lakes
rain
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उत्तर
rain
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संबंधित प्रश्न
What is the major source of fresh water in the city/town/village where you live?
Give balanced chemical equation for the reaction of water with Iron .
How is rain produced?
What is the effect of impurities present in the water on the melting point and boiling point of water?
How is aquatic life benefited by the fact that water has maximum density at 4oC?
Explain why:
If distilled water is kept in a sealed bottle for a long time, it leaves etchings on the surface of the glass.
Name the process which is responsible for the formation of droplets on the surface of a glass of cold drink. _______
Water is colourless, odourless and _______.
Why should we not throw cooking oil and fats down the drain?
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 |
