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प्रश्न
Tick the most appropriate answer.
Rising and setting of the sun at a given place is a
पर्याय
periodic change
undesirable change
physical change
reversible change
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उत्तर
periodic change.
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संबंधित प्रश्न
Classify the following as chemical or physical change:
Burning of paper and wood
Tick the most appropriate answer.
4. Chemical changes involve
- change in shape.
- change in size.
- change in molecular composition.
- none of these
State the various conditions that favour the process of evaporation.
Make a list of different types of changes with example.
Classify the following as a physical or a chemical change.
Melting of wax
Give reasons why – separation of mixtures e.g. iron from a mixture of iron and sulphur is a physical change, but heating a mixture of iron and sulphur is considered a chemical change.
Compare the energy changes involved during a physical and a chemical change.
Select the chemical changes from the following list of changes
Glowing of an electric bulb.
Assertion: The explosion of fire cracker is a physical change.
Reason: A physical change is a reversible change.
Adding sugar to milk is a physical change.
