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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:
Cutting of trees
Tick the most appropriate answer.
5. Photosynthesis requires
- heat energy.
- wind energy
- sunlight.
- sound energy
State whether the following is physical or chemical changes.
water cycle in nature —
Classify the following changes as physical or chemical.
State the Differences Between a Physical Change and a Chemical Change.
Fill in the blank.
The process of a liquid changing into a solid is called ________
Fill in the blank with the appropriate word of the statement given below:
If a change is permanent and irreversible it is considered a _________ change.
Fill in the blank with the correct word of the statement given below:
Sublimation involves a __________ change.
A change in which matter undergoes a change but the total mass of the substance is unaltered is a ______ change.
Classify the following as physical or chemical properties
Metallic sodium is soft enough to be cut with a knife.
