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प्रश्न
What should be done if the clothes of a person catch fire accidentally? Why?
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उत्तर
- Cover the person in a rug or blanket and Roll him on the floor.
- This will cut off the air and put out the flames.
- A suitable fire extinguisher can also be chosen.
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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 |
Write ‘True’ or ‘False’ in front of following statement.
Atmospheric nitrogen is directly absorbed by the plants to form plant proteins.
How is greenhouse effect produced?
Give two uses of the following component present in air:
carbon dioxide
How is air useful to windmills?
Tick (√) the correct alternative from the choice given for the following statement.
The gases which cause acid rain are
Describe a simple experiment with the help of a diagram to show that Air has mass
With whom should I pair up?
| Group A | Group B | ||
| (1) | Air | (a) | Excretion |
| (2) | Water | (b) | Scattering of light |
| (3) | Soil | (c) | Plasticity |
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?
List five activities that are possible due to the presence of air.
