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प्रश्न
When a woolen yarn is knitted to get a sweater, the change can be classified as ____________.
विकल्प
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
Classify the following as chemical or physical change:
Rusting of almirah
Classify the following as chemical or physical change:
Burning of paper and wood
Changes in which only ______ properties of a substance change are called physical changes.
Dissolving salt in water is a reversible change.
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
Decomposition of leaves is a fast change.
What are man-made changes ?
Classify the following as a physical or a chemical change.
Burning of coal
Explain the term – ‘sublimation’. Is sublimation of naphthalene – a physical or a chemical change. Give reasons.
Adding sugar to milk is a physical change.
