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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
Give two uses of the following component present in air:
nitrogen
State two similarities and two differences between respiration and burning.
How is air useful to water boats?
How is air useful to windmills?
State four steps to be taken to control air pollution.
Fill in the blank
Polluted air is harmful to ____.
Tick (√) the correct alternative from the choice given for the following statement.
Air pollution is due to the
A mixture has a variable composition. Give three other reasons why air is considered a mixture and not a compound.
Name a device which uses wind energy to generate electricity.
Cool and soothing wind: Breeze.
uproot trees wind: ______.
