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प्रश्न
Tick (√) the correct alternative from the choice given for the following statement.
Air consists of
विकल्प
only oxygen
only nitrogen
only carbon dioxide
all of these
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उत्तर
all of these
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संबंधित प्रश्न
What was the ancient belief regarding the nature of matter ?
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 do you observe when a beam of light is allowed to enter in a closed dark room through a small hole.
Tick (√) the correct alternative from the choice given for the following statement.
Photosynthesis is a process in which plants
With whom should I pair up?
| Group A | Group B | ||
| (1) | Air | (a) | Excretion |
| (2) | Water | (b) | Scattering of light |
| (3) | Soil | (c) | Plasticity |
Fill in the blank:
The gas evolved as a product of combustion as well as respiration is ______.
Fill in the blank:
A candle burns in a jar of oxygen, but gets extinguished in ______
Air has no ______ & ______.
Make sentences using the given set of words.
Air, wind, motion, called
Explain the following observations very briefly
A firki does not rotate in a closed area.
