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प्रश्न
Match the items of Column I with the items of Column II
| Column I | Column II | ||
| (a) | Weather cock | (i) | Gases and fine dust particles |
| (b) | Mountaineers | (ii) | Sailing yacht |
| (c) | Fine hair inside the nose | (iii) | Oxygen cylinders |
| (d) | Smoke | (iv) | Direction of air flow |
| (e) | Wind | (v) | Prevent dust particles |
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उत्तर
| Column I | Column II | ||
| (a) | Weather cock | (iv) | Direction of air flow |
| (b) | Mountaineers | (iii) | Oxygen cylinders |
| (c) | Fine hair inside the nose | (v) | Prevent dust particles |
| (d) | Smoke | (i) | Gases and fine dust particles |
| (e) | Wind | (ii) | Sailing yacht |
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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 |
Give two uses of the following component present in air:
water vapour
Name the processes which maintain the balance between oxygen and carbon dioxide in the air. How is it done?
What is air pollution?
State what do you understand by the term ‘air’. Explain its importance to mankind.
Why is it said that-
Air is a homogeneous mixture of various gases.
Name the important scientists and their studies which led to the discovery of the components of air.
Take a squeezable bottle. Make a hole on the lid and close the bottle tightly. Bring the bottle near your face and press the bottle. What do you feel?
What is global warming?
Which of the following statements is incorrect?
