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प्रश्न
Write true or false
Earthquake is a desirable change.
पर्याय
True
False
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उत्तर
False
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संबंधित प्रश्न
State the various conditions that favour the process of evaporation.
Match the columns.
| Column A | Column B |
| 1. a change which cannot be easily reversed | a. man-made change |
| 2 a change that repeats itself at regular intervals | b. chemical chang |
| 3. a change that is made by humans | c. physical change |
| 4. a change in which the original substance cannot be obtained | d. periodic change |
| 5. a change where no new substance is formed | e. irreversible change |
| f . slow change |
Write true or false
A natural change can also be a desirable change.
Make a list of different types of changes with example.
Classify the following as physical or chemical change :
Condensation of steam
Classify the following as a physical or a chemical change.
Manufacture of salt from sea water
Define a chemical change. Give two examples of the above 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.
Desirable and undesirable change.
Select the chemical changes from the following list of changes
Vaporisation of water into water vapour.
Select the correct answer from the choice given below to complete the sentence
The energy required for completion of a physical change is ______________ when the change is reversed.
