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प्रश्न
How is air useful to windmills?
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उत्तर
Windmills work where there is sufficient movement of air.
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संबंधित प्रश्न
Match the following :
| Column A | Column B |
| (a) Global warming | 1. Hydrated ferric oxide |
| (b) Acid rain | 2. Manganese dioxide |
| (c) Rust | 3. Carbon dioxide |
| (d) Catalyst | 4. Methane |
| (e) Photosynthesis | 5. Nitrogen Dioxide |
Write ‘True’ or ‘False’ in front of following statement.
Atmospheric nitrogen is directly absorbed by the plants to form plant proteins.
What do you observe when a beam of light is allowed to enter in a closed dark room through a small hole.
Write the chemical name of The white insoluble solid formed on the reaction of carbon dioxide with lime water.
Mention five causes of air pollution.
What is the importance of air in transmission of sound?
Match the statements in List I with the correct answer from List II.
| List I | List II |
| 1. The constituent of air which is around 0.02% | A: Nitrogen |
| 2. The constituent of air which is inert or unreactive | B: Oxygen |
| 3. The constituent of air which is non-combustible, but supports combustion. |
C: Sulphur dioxide |
| 4. A pollutant in air responsible for acid rain | D: Carbon dioxide |
| 5. The main rare gas present in air. | E: Argon |
Air has variable composition and hence there is ______ oxygen at lower altitudes than at higher altitudes.
The layer of air around the earth is known as ______.
About 78% of the volume of air is ______.
