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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
How is greenhouse effect produced?
Fill in the blank:
_____________ discovered the oxygen gas.
Match the statements in Column A, with those in Column B.
| Column A | Column B |
| 1. Largest Constituent of air, which dilutes the activity of oxygen. |
(a) Oxygen |
| 2. A gas used for filling weather observation balloons. | (b) carbon acid |
| 3. An acid formed by the dissolution of sulphur dioxide gas in water. | (c) Sulphur acid |
| 4. An acid formed by the dissolution of carbon dioxide in water. | (d) Helium |
| 5. A gas vital for respiration. | (e) Nitrogen |
What is wind?
What do you observe when a burning candle is covered with an inverted jar.
What do you observe when a beam of light is allowed to enter in a closed dark room through a small hole.
Describe a simple experiment with the help of a diagram to show that Air occupies space
Draw a neat labelled diagram for the following experiment.
To demonstrate the burning of sulphur in a jar of oxygen.
Wind does not help in the movement of which of the following?
Explain the following observations very briefly
A firki does not rotate in a closed area.
