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प्रश्न
What is air pollution?
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उत्तर
Air Pollution: “Mixing of UNWANTED and HARMFUL SUBSTANCES in the air is called AIR POLLUTION.”
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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 |
Discuss harmful effects of greenhouse effect.
Why can’t we see air?
What do you observe when a beam of light is allowed to enter in a closed dark room through a small hole.
Name two air pollutants which cause acid rain.
Tick (√) the correct alternative from the choice given for the following statement.
Which of the following is not a greenhouse gas?
Give a brief account of the discovery of air and the scientists involved.
State whether the following statement is ‘true’ or ‘false’. If false write the correct statement.
Air is a mixture and not a compound since the components of air cannot be separated by physical methods.
The capacity of air to hold moisture depends upon the ______ of the air.
Why is it said that-
Air is a homogeneous mixture of various gases.
