Advertisements
Advertisements
प्रश्न
True or false
In a physical change no net energy change is involved.
विकल्प
True
False
Advertisements
उत्तर
True
APPEARS IN
संबंधित प्रश्न
Tick the most appropriate answer.
4. Chemical changes involve
- change in shape.
- change in size.
- change in molecular composition.
- none of these
Fill in the blank.
Changes that occur in nature are called ........................
Write short answer.
Give an example of desirable change which can also be undesirable
What are reversible and irreversible changes ? Give one example for each.
State four differences between physical and chemical changes.
True or false
Dissolving of a solid in liquid is a physical change.
Which of the following are physical changes and which are chemical changes ?
The rusting of an iron object is called :
Give a reason why
Freezing of water is a reversible change while burning of a candle – an irreversible change.
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 |
