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प्रश्न
What is global warming?
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उत्तर
The increased greenhouse effect is caused due to increase in air pollutants and it results in the average increase in temperature of the atmosphere. This is called Global warming.
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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 |
Write ‘True’ or ‘False’ in front of following statement.
Atmospheric nitrogen is directly absorbed by the plants to form plant proteins.
How is greenhouse effect produced?
What is wind?
A mixture has a variable composition. Give three other reasons why air is considered a mixture and not a compound.
While freezing, the ______ of water is lowered.
Explain the term ‘air pollution’, with reference to air quality. State the sources of a few main pollutants.
Air has variable composition and hence there is ______ oxygen at lower altitudes than at higher altitudes.
Mention two uses of air.
Explain the following observations very briefly
A firki does not rotate in a closed area.
