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प्रश्न
What are man-made changes ?
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उत्तर
Man-made changes are those that occur because of human activities e.g. changing the direction of flow of a river by building a dam.
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संबंधित प्रश्न
Classify the following as chemical or physical change:
Rusting of almirah
Tick the most appropriate answer.
4. Chemical changes involve
- change in shape.
- change in size.
- change in molecular composition.
- none of these
State whether the following is physical or chemical changes.
shaping a piece of glass —
Write true or false
Cutting of paper into pieces is a chemical change.
Write true or false
Dissolving of solute in a solvent and rusting of iron are both physical changes.
Change is the law of nature and occurs in our everyday life, at all times and in all places.
Differentiate between the following change with a suitable example.
Slow and fast change.
Give a reason why – Heating a platinum wire is a reversible change but, heating a magnesium wire is an irreversible change.
Select the chemical changes from the following list of changes
Butter turning rancid
Digestion of food is a physical change.
Give two examples for the following case:
Physical changes which are not reversible
