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प्रश्न
True or false
In a physical change no net energy change is involved.
पर्याय
True
False
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उत्तर
True
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संबंधित प्रश्न
When a candle burns, both physical and chemical changes take place. Identify these changes. Give another example of a familiar process in which both the chemical and physical changes take place.
Choose the most appropriate answer.
Rising and setting of the sun at a given place is a
Make a list of different types of changes with example.
State whether the following is physical or chemical changes.
water cycle in nature —
Tick the most appropriate answer.
Photosynthesis requires
Make a list of different types of changes with example.
Name the following:
The final product of the physical change involved during the ‘melting of a piece of wax’.
Match the examples of changes in List I with the correct type of change in List II.
| List I | List II |
| 1. Burning of paper | A: Physical change |
| 2. The ringing of an electric bell | B: Chemical change |
| 3. Curdling of milk | |
| 4. Electric light is switched on | |
| 5. Melting of butter |
______ is the substance that is dissolved in a solvent.
Two drops of dilute sulphuric acid were added to 1 g of copper sulphate powder and then small amount of hot water was added to dissolve it (step I). On cooling, beautiful blue coloured crystals got separated (step II). Step I and Step II are:
