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प्रश्न
Fill in the blank
Revolution of the earth around the sun is a ________ change.
उत्तर
Revolution of the earth around the sun is a natural periodic change.
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संबंधित प्रश्न
Write true or false for the statement.
Burning of paper and formation of curd are reversible changes
Write true or false for the statement.
Deforestation is a man-made change
Which of the following are physical changes and which are chemical changes?
Burning of candle wax, Melting of candle wax, Mixing of iron filings and sand, Burning of wood, Breaking a piece of chalk, Burning a piece of paper, Cutting a piece of paper.
Classify the following as a physical or a chemical change.
Manufacture of salt from sea water
Classify the following as a physical or a chemical change.
Butter getting rancid
Give four difference between physical and chemical changes.
Name the following:
The type of change physical or chemical involved – ‘when a substance undergoes a change in state, colour or size’.
Compare the energy changes involved during a physical and a chemical change.
Select the correct answer from the choice given below to complete the sentence
The dissolution of lead nitrate in water is deemed as a _________ change.
Keeping a stone in sunlight for few hours is ______.
