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प्रश्न
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?
एका वाक्यात उत्तर
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उत्तर
Air will come rushing out of the bottle.
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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 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 beam of light is allowed to enter in a closed dark room through a small hole.
How is air useful to agriculture?
How is air useful to windmills?
Fill in the blank:
The gas evolved as a product of combustion as well as respiration is ______.
Fill in the blank:
Rusting is a chemical reaction which involves _____ oxidation.
The composition of air is always exactly the same.
Air has no ______ & ______.
Match the following:
| 1. | Layer of air | a. | Hand fan |
| 2. | Electrical energy | b. | 21% |
| 3. | Nitrogen | c. | Windmill |
| 4. | Oxygen | d. | Atmosphere |
| 5. | Palm Trees | e. | 78% |
