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प्रश्न
Why can’t we see air?
उत्तर
We can’t see air because it is colourless, odourless and transparent gaseous matter.
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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 |
Name two important processes supported by oxygen present in air.
Tick (√) the correct alternative from the choice given for the following statement.
Rust is
Describe a simple experiment with the help of a diagram to show that Air exerts pressure
Water does not have a ______ but has definite ______ and ______.
What will happen if the amount of water vapour in the air increases.
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?
The composition of air is always exactly the same.
List five activities that are possible due to the presence of air.
Make sentences using the given set of words.
Air, wind, motion, called
