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प्रश्न
What is air pollution?
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उत्तर
Air Pollution: “Mixing of UNWANTED and HARMFUL SUBSTANCES in the air is called AIR POLLUTION.”
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संबंधित प्रश्न
Mention the contribution of the following scientists :
- Antoine Lavoisier
- Robert Boyle
- Joseph Priestley
- Sir W. Ramsay
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:
oxygen
Tick (√) the correct alternative from the choice given for the following statement.
Respiration
Fill in the blank:
A candle burns in a jar of oxygen, but gets extinguished in ______
Draw a neat labelled diagram for the following experiment.
To demonstrate the burning of sulphur in a jar of oxygen.
Mention two advantages of wind energy.
Cool and soothing wind: Breeze.
uproot trees wind: ______.
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?
