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प्रश्न
When a woolen yarn is knitted to get a sweater, the change can be classified as ____________.
पर्याय
physical change
chemical change
endothermic change
exothermic change
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उत्तर
When a woolen yarn is knitted to get a sweater, the change can be classified as physical change.
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संबंधित प्रश्न
Match the columns
| column A | coulmn B |
| 1. A change which cannot be easily reversed | a. man-made change |
| 2.A change that repeats itself at regular intervals | b. chemical change |
| 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 formade | e. irreversible change |
| f. slow change |
Write short answer.
Give two examples of periodic changes
State whether the following statement is true or false. If false write the correct statement.
Melting of butter and wax are examples of chemical changes.
Name the following:
The type of change physical or chemical involved – ‘when a substance undergoes a change in state, colour or size’.
Compare the energy changes involved during a physical and a chemical change.
Select the chemical changes from the following list of changes
Rotting of eggs.
Name the following.
The product of the chemical change in keeping a polished iron nail exposed to the atmosphere.
Ice, water and water vapour look different and display different ______ properties but they are ______ the same.
Give two examples for the following case:
Physical changes which are reversible
Give an example of a physical change in which the color of the substance changes.
