CBSE Science Class 6 - Changes Around Us Chapter 6 NCERT Solution
1. To walk through a waterlogged area, you usually shorten the length of your dress by folding it. Can this chnge be reserved ?
Answer:
Yes, it can be reserved by unfolding the dress.
2. You accidentally dropped your favourite toy and broke it. This is a change you did not want. Can this changed be reversed ?
Answer:
No, this change (breaking of toy) 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.
Answer:
- No
- Yes
- Yes
- No
- No
- No
4. A drawing sheet changes when you draw picture on it. Can you reverse this change ?
Answer:
If the picture is drawn with a pencil, then it can be erased; hence change can be reversed.
5. Give examples to explain the difference between changes that can or cannot be reversed.
Answer:
Some changes can be reversed, like :
- filling glass with water
- opening/closing door
Other changes cannot be reversed, like :
- Curdling of milk
- Ripening of milk.
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 immobilised. Can the change in POP be reversed ?
Answer:
No. The change in POP cannot be reversed.
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 occured in the cement, could be reversed ?
Answer:
No. The changes which have occured in the cement cannot be reversed.