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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 changes involved in the following process as physical or chemical changes:
Photosynthesis
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.
Classify the following changes as physical or chemical: curdling of milk
Classify the following changes as physical or chemical:- melting of a solid (wax)
Write true or false
Cutting of paper into pieces is a chemical change.
Fill in the blank
Heat is ________ by a gas during the process of condensation.
Write true or false
Burning of paper and formation of curd are reversible changes.
Classify the following as physical or chemical change :
Growth of a plant
Classify the following as a physical or a chemical change.
Butter getting rancid
A physical change is generally____________.
