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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
Tick the most appropriate answer.
5. Photosynthesis requires
- heat energy.
- wind energy
- sunlight.
- sound energy
State whether the following is physical or chemical changes.
glowing of a bulb -
State whether the following is physical or chemical changes.
water cycle in nature —
Fill in the blank.
The process of a liquid changing into a solid is called ________
Fill in the blank with the correct word of the statement given below:
Sublimation involves a __________ change.
Give a reason why – Heating a platinum wire is a reversible change but, heating a magnesium wire is an irreversible change.
Give the reason why the following is considered as chemical changes.
Copper carbonate on heat gives copper oxide and carbon dioxide.
What is the difference between dissolution of sugar and burning of sugar ?
Give two examples for the following case:
Physical changes which are reversible
Give an example to justify the statement that physical changes can be reversible as well as irreversible.
