MCQ
How can water vapour in the air return to Earth?
- AIt evaporates and is blown by the wind
- BIt evaporates and forms clouds
- ✓It condenses then precipitates
- DIt stick to any warm surface it comes in contact with
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$P-$ Recycling reduces pollution
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$Q-$ Recycling makes the environment unfit of living things`
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$R-$ Recycling helps to conserve energy
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$S-$ Recycling results in wastage of natural resources
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S.No.
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Changes
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Type
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$1.$
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Sharpening of pencil.
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Physical, reversible.
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$2.$
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Evaporation of water.
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Physical, irreversible.
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$3.$
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Opening of a bud.
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Chemical irreversible.
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$4.$
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Rusting of iron.
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Chemical reversible.
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