Science Class 6 – Chapter 6 – Changes Around Us – NCERT Exercise Solutions (Question-Answer) is provided below. Total 7 Questions are in this NCERT Chapter Exercise, all are solved here.
Exercises
Q1. To walk through a waterlogged area, you usually shorten the length of your dress by folding it. Can this change be reversed?
Answer: Yes, this change can be reversed.
Q2. You accidentally dropped your favourite toy and broke it. This is the change of you did not want. Can this change be reversed?
Answer: No, the change cannot be reversed.
Q3. Some changes are listed in the following table. For each change, write in the blank column, whether the change can be reversed or not.
| S.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 :-
| S.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 |
Q4. A drawing sheet changes when you draw a picture on it. Can you reverse this change?
Answer: No, the change can not be reversed once we draw a picture on the drawing sheet with a pen or colour. But this change can be reversed if we used a pencil to draw the picture.
Q5. Give examples to explain the difference between changes that can or cannot be reversed.
Answer:
Examples of changes that can be reversed-
- Filling the balloon with air.
- Melting of Wax
- Melting of coal tar
- Melting of Ice
- Knitting of sweater
Examples of change that cannot be reversed-
- Bursting of balloon
- Burning of Candle.
- Ripening of fruits/vegetables.
- Burning of paper.
- Milk to Curd
Q6. 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 immobilised. Can the changes in POP be reversed?
Answer: No, the changes of Plaster of Paris cannot be reversed.
Q7. 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 occurs in the cement, could be reversed?
Answer: No, the changes cannot be reversed.
Science class 6 – Chapter 6 – Changes Around Us – NCERT Exercise Solutions (Question-Answer) ended👍👍👍
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