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प्रश्न
How is air useful to scooters and cars.?
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उत्तर
Air filled tyres of cars move smoothly on road as there is less friction.
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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.
Fill in the blank:
_____________ discovered the oxygen gas.
Why can’t we see air?
What is wind?
How is air useful to water boats?
Fill in the blank:
The gas evolved as a product of combustion as well as respiration is ______.
Complete the statement given below by filling in the blank with the correct word/s from the word/s given below
____________ is an example of a pollutant present in the air.
Mention two advantages of wind energy.
Explain the following observations very briefly
The arrow of weather cock points towards a particular direction at a particular moment.
