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प्रश्न
Fill in the blank:
_____________ discovered the oxygen gas.
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उत्तर
Joseph Priestley discovered the oxygen gas.
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संबंधित प्रश्न
Mention the contribution of the following scientists :
- Antoine Lavoisier
- Robert Boyle
- Joseph Priestley
- Sir W. Ramsay
How is air useful to agriculture?
Fill in the blank
Polluted air is harmful to ____.
Tick (√) the correct alternative from the choice given for the following statement.
Fuels which do not leave any residue on burning are
Answer in your own words.
What are the various constituents of air? Write their uses.
Fill in the blank:
Nitrogen of the air is utilized by plants for formation of _____.
Air has variable composition and hence there is ______ oxygen at lower altitudes than at higher altitudes.
What should be done if the clothes of a person catch fire accidentally? Why?
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% |
Which of the following statements is incorrect?
