Question
Differentiate between compost and vermicompost?
| Compost | Vermicompost |
| It is prepared from all type of organic waste like sewage, animal refuse, farm waste, etc, and take 3-6 month to prepare. | It is prepared from domestic waste, vegetable waste and takes 1-2 months to prepare. |
| Organic remains are decomposed by microbes. | Organic remains are pulverised by earthworms. |
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Name the two acids that are present in acid rain.
| Temperature: | 10°C | 20°C | 40°C | 60°C | 80°C |
| Solubility: | 24g | 37g | 41g | 55g | 66g |
What is a megaphone? Name the principle on which a megaphone works.


Explain why, a piece of glass sinks in water but it floats in mercury.