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प्रश्न
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.
Desirable and undesirable change.
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उत्तर
| Desirable change | Undesirable change |
| (i) Changes brought about by nature or man which produces – useful or good results. | (i) Changes brought about by nature or man which produces – useless or bad results. |
| (ii) Positive and advantageous nature. | (ii) Negative and detrimental nature. |
| (iii) Examples of a desirable change: Rain bringing water to the crops, change of milk to curd, ripening of fruits seedling into a plant. |
(iii) Examples of an undesirable change: Rain causing destruction by floods, milk turning sour on a hot day, rotting of fruits, cutting of trees. |
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संबंधित प्रश्न
Classify the following as chemical or physical change:
Melting of butter in a pan
State whether the following statement is true or false. In case a statement is false, write the corrected statement.
Cutting a log of wood into pieces is a chemical change.
Ripening of fruits is a desirable change.
State whether the following is physical or chemical changes.
lightning —
State whether the following is physical or chemical changes.
cutting wood into small pieces —
Tick the most appropriate answer.
Photosynthesis requires
Given reason:
Freezing of water to ice and evaporation of water are physical changes.
Give the reason why the following is considered as chemical changes.
Copper carbonate on heat gives copper oxide and carbon dioxide.
Name the following.
The salt obtained when a chemical change takes place on the addition of iron to dilute sulphuric acid.
When a woolen yarn is knitted to get a sweater, the change can be classified as ____________.
