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प्रश्न
What was the ancient belief regarding the nature of matter ?
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उत्तर
The ancient belief about the nature of matter was that it is com-pound of four elements
- fire
- air
- wood
- earth
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संबंधित प्रश्न
What is wind?
How is air useful to windmills?
Fill in the blank
Polluted air is harmful to ____.
Describe a simple experiment with the help of a diagram to show that Air occupies space
State whether the following statement is ‘true’ or ‘false’. If false write the correct statement.
Air is a mixture and not a compound since the components of air cannot be separated by physical methods.
With whom should I pair up?
| Group A | Group B | ||
| (1) | Air | (a) | Excretion |
| (2) | Water | (b) | Scattering of light |
| (3) | Soil | (c) | Plasticity |
What is the importance of air in transmission of sound?
Mention two advantages of wind energy.
In a number of musical instruments, air plays an important role. Can you name some such instruments?
Paheli kept some water in a beaker for heating. She observed that tiny bubbles appeared before the water started to boil. She boiled the water for about 5 minutes and filled it in a bottle up to the brim and kept the bottle air tight till it cooled down to room temperature.
Why did the tiny bubbles appeared?
