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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:
Passing of electric current through water, and water breaking down into hydrogen and oxygen gases.
Chemical changes are accompanied by changes in energy.
Classify the following changes as physical or chemical:-boiling
Name a chemical change which takes place in presence of:
Tick (√) the correct alternative from the choice given for the following statement.
A substance which can not sublime is
True or false
Change of seasons is a non-periodic change.
Match the examples of changes in List I with the correct.
| List I | List II |
| 1. Expansion of a steel rod on heating | A: Physical change |
| 2. Rotting of eggs | B: Chemical change |
| 3. Milk turning sour | |
| 4. Tarnishing of copper | |
| 5. Separation of naphthalene from a mixture of naphthalene and sodium chloride. |
Fill in the blank with the correct word of the statement given below:
Sublimation of iodine is an example of _________ change.
Name the following:
The term involved in the change of state from – ‘water to ice’ – which is a physical change.
A physical change is generally____________.
