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प्रश्न
What do you observe when a beam of light is allowed to enter in a closed dark room through a small hole.
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उत्तर
We will observe randomly moving dust particles in the beam of light. This confirms the presence of dust particles in the 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 |
What was the ancient belief regarding the nature of matter ?
Mention the contribution of the following scientists :
- Antoine Lavoisier
- Robert Boyle
- Joseph Priestley
- Sir W. Ramsay
Name two air pollutants which cause acid rain.
Name three greenhouse gases.
Name the following.
Inert gases in the air
Name the important scientists and their studies which led to the discovery of the components of air.
Explain Lavoisier’s experiment which provided evidence to the discovery of components in air.
What is wind energy?
State whether the following statement is true or false. If false, correct them.
Air does not occupy any space.
