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प्रश्न
Discuss harmful effects of greenhouse effect.
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उत्तर
Large amount of carbon-dioxide in the polluted air results in increase of greenhouse effect which has raised the average temperature of the Earth by 2°C. This results in global warming which, in turn, will melt ice on the polar caps, thereby raising the level of sea water by a few metres. This can result in submerging of coastal areas and islands causing excessive damage.
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संबंधित प्रश्न
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 observeation balloons. | (b) Carbonic acid |
| 3. An acid formed by the dissolution of sulphur dioxide gas in water. | (c) Sulphuric acid |
| 4. An acid formed by the dissolution of carbon dioxide in water. | (d) Helium |
| 5. A gas vital for respiration. | (e) Nitrogen |
What do you observe when Carbon dioxide gas is passed through lime water.
Give two uses of the following component present in air:
oxygen
How is air useful to agriculture?
How is air useful to scooters and cars.?
Tick (√) the correct alternative from the choice given for the following statement.
Fuels which do not leave any residue on burning are
Give a brief account of the discovery of air and the scientists involved.
How is light scattered by the air?
Air has variable composition and hence there is ______ oxygen at lower altitudes than at higher altitudes.
Which of the following statements is incorrect?
