NCERT Solutions Class 6 Science
The NCERT Solutions in English Language for Class 6 Science Chapter – 6 (Changes Around Us) has been provided here to help the students in solving the questions from this exercise.
Chapter – 6 (Changes Around Us)
1. To walk through a waterlogged area, you usually shorten the length of your dress by folding it. Can this change be reversed?
Answer – Yes, it can be reversed by unfolding the dress.
2. You accidentally dropped your favorite toy and broke it. This is a change you did not want. Can this change be reversed?
Answer – No, this change cannot be reversed
3. Some changes are listed in the following table. For each change, write in the blank column, whether the change can be reversed or not.
| Sl No | Change | Can be reversed Yes/No |
| 1 | The sawing of a piece of wood | |
| 2 | The melting of ice candy | |
| 3 | Dissolving sugar in water | |
| 4 | The cooking of food | |
| 5 | The ripening of a mango | |
| 6 | Souring of milk |
Answer –
| Sl No | Change | Can be reversed Yes/No |
| 1 | The sawing of a piece of wood | No |
| 2 | The melting of ice candy | Yes |
| 3 | Dissolving sugar in water | Yes |
| 4 | The cooking of food | No |
| 5 | The ripening of a mango | No |
| 6 | Souring of milk | No |
4. A drawing sheet changes when you draw a picture on it. Can you reverse this change?
Answer – No. We cannot reverse this change. Because we cannot get a fresh drawing sheet once a picture is drawn on it. But if the pencil is used to draw the picture, we can reverse the change.
5. Give examples to explain the difference between changes that can or cannot be reversed.
Answer –
Changes that can be reversed :- In such changes, we can return back to the original position if the cause of change is withdrawn; for example,
- Heating of milk,
- Glowing of Electric bulb,
- Distillation of liquid,
- Drying of clothes,
- Knitting a sweater,
- Stretching a rubber band,
- Melting of ice,
- Filling glass with water, etc.
Changes that cannot be reversed : The changes in which we cannot go back to the original position, even if we withdraw the cause of change; for example,
- Boiling of egg,
- Burning of Paper or Wood,
- Rusting of Iron,
- Growth of plants and animal
- Conversion of milk into curd
- Ripening of fruit,
- Making flour from grain,
- The flowering of a bud, etc.
6. A thick coating of a paste of Plaster of Paris (POP) is applied over the bandage on a fractured bone. It becomes hard on drying to keep the fractured bone immobilized. Can the change in POP be reversed?
Answer – No, the change in POP cannot be reversed since it is a chemical change.
7. A bag of cement lying in the open gets wet due to rain during the night. The next day the sun shines brightly. Do you think the changes, which have occurred in the cement, could be reversed?
Answer – No, these are irreversible chemical changes.
NCERT Solutions for Class 6 Science
- Chapter 1 – Food Where Does It Come From
- Chapter 2 – Components of Food
- Chapter 3 – Fibre to Fabric
- Chapter 4 – Sorting Materials Into Groups
- Chapter 5 – Separation of Substances
- Chapter 7 – Getting to Know Plants
- Chapter 8 – Body Movements
- Chapter 9 – The Living Organisms and Their Surroundings
- Chapter 10 – Motion and Measurement of Distances
- Chapter 11 – Light, Shadows and Reflection
- Chapter 12 – Electricity and Circuits
- Chapter 13 – Fun with Magnets
- Chapter 14 – Water
- Chapter 15 – Air Around Us
- Chapter 16 – Garbage In, Garbage Out
