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प्रश्न
Which of the following statements is incorrect?
पर्याय
All living things require air to breathe.
We can feel air but we cannot see it.
Moving air makes it possible to fly a kite.
Air is present everywhere but not in soil.
उत्तर
Air is present everywhere but not in soil.
Explanation:
Air is omnipresent and is present in soil too. This can be inferred by adding water to a pot filled with a lump of soil. After adding water it can be observed that the soil absorbs all the water and air bubbles are formed. These air bubbles show the escaping air.
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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 |
Discuss harmful effects of greenhouse effect.
Why can’t we see air?
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Although we cannot see air, we can ___it.
Tick (√) the correct alternative from the choice given for the following statement.
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Tick (√) the correct alternative from the choice given for the following statement.
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______ soil has pH 7.
Draw a neat labelled diagram for the following experiment.
To study the presence of carbon dioxide in air.
Mention two advantages of wind energy.
Explain the following observations very briefly
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