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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
Classify the following as chemical or physical change:
Passing of electric current through water, and water breaking down into hydrogen and oxygen gases.
State the various conditions that favour the process of evaporation.
Tick (√) the correct alternative from the choice given for the following statement.
An example of both physical and chemical change is
The rusting of an iron object is called :
What will you take into account while identifying the following?
A physical change in a substance.
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.
Natural and man-made change.
Compare the energy changes involved during a physical and a chemical change.
Give a reason why – Addition of zinc nitrate to water is a physical change but, the addition of zinc to dilute nitric acid is a chemical change.
Natural changes which take place in nature on their own, are beyond the control of human being.
Match the items of Column I with the items of Column II.
| Column I | Column II | ||
| (a) | Large crystals | (i) | Turns lime water into milky |
| (b) | Depositing a layer of zinc on iron | (ii) | Physical change |
| (c) | Souring of milk | (iii) | Rust |
| (d) | Carbon dioxide | (iv) | Sugar candy (Mishri) |
| (e) | Iron oxide | (v) | Chemical change |
| (f) | Dissolving common salt in water | (vi) | Galvanisation |
