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प्रश्न
Give two examples for the following case:
Physical changes which are reversible
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उत्तर
- Folding of paper
- Melting of ice
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संबंधित प्रश्न
A burning candle shows both physical and chemical changes. Explain ?
State whether the following is physical or chemical changes.
growing of a piglet into a pig —
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.
Classify the following as physical or chemical change :
Formation of curd from milk
What is a chemical change ? Give two examples of chemical changes.
Fill in the blank.
There is no change in the _____________of the substance during a physical change.
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.
Ice, water and water vapour look different and display different ______ properties but they are ______ the same.
Cutting a log of wood into pieces is a chemical change.
