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प्रश्न
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?
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उत्तर
Air will come rushing out of the bottle.
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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 |
What is greenhouse effect?
Give two uses of the following component present in air:
water vapour
State two similarities and two differences between respiration and burning.
How is air useful to water boats?
Tick (√) the correct alternative from the choice given for the following statement.
Which of the following is not a greenhouse gas?
A mixture has a variable composition. Give three other reasons why air is considered a mixture and not a compound.
Draw a neat labelled diagram for the following experiment.
To demonstrate the burning of sulphur in a jar of oxygen.
Air has no ______ & ______.
Explain the following observations very briefly
A firki does not rotate in a closed area.
