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प्रश्न
How is air useful to water boats?
एका वाक्यात उत्तर
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उत्तर
Air helps the movement of water boats.
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संबंधित प्रश्न
Mention the contribution of the following scientists :
- Antoine Lavoisier
- Robert Boyle
- Joseph Priestley
- Sir W. Ramsay
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 |
Fill in the blank:
_____________ discovered the oxygen gas.
How is air useful to scooters and cars.?
What is meant by ozone depletion?
Tick (√) the correct alternative from the choice given for the following statement.
Photosynthesis is a process in which plants
Fill in the blank:
A candle burns in a jar of oxygen, but gets extinguished in ______
Name a device which uses wind energy to generate electricity.
About 78% of the volume of air is ______.
State whether the following statement is true or false. If false, correct them.
Air does not occupy any space.
