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प्रश्न
Write true or false
Burning of paper and formation of curd are reversible changes.
पर्याय
True
False
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उत्तर
False.
Burning of paper and formation of curd are irreversible changes.
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संबंधित प्रश्न
Explain the following giving an example.
Pure substance
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 |
State whether the following is physical or chemical changes.
glowing of a bulb -
State whether the following is physical or chemical changes.
shaping a piece of glass —
State whether the following is physical or chemical changes.
cutting wood into small pieces —
True or false
Dissolving of a solid in liquid is a physical change.
Give three reasons why melting of wax, is considered a physical change while burning of a candle, a chemical change.
You are given some candle wax. Can you make a candle doll from it? What kind of change is this?
Which of the following is a physical change?
Grinding of wheat grain changes its size. It is a ____________ change.
