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शनिवार, 22 जुलाई 2017

Class–VI (CHAPTER-06) CHANGES AROUND US

Class–VI
(CHAPTER-06)
CHANGES AROUND US
Question 1.walk through a waterlogged area, you usually shorten the length of your dress by folding it. Can this change be reversed?
Answer: Yes, this can be reversed.
Question 2.You accidently 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.
Question 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.
S No.ChangeCan be reversed
Yes/No
1.
2.
3.
4.
5.
6.
The sawing of a piece of wood.
The melting of ice candy
Dissolving sugar in water
The cooking of food
The ripening of mango
Souring of milk
Answer:
S No.ChangeCan be reversed
Yes/No
1.
2.
3.
4.
5.
6.
The sawing of a piece of wood.
The melting of ice candy
Dissolving sugar in water
The cooking of food
The ripening of mango
Souring of milk
No
Yes
Yes
No
No
No
Question 4.A drawing sheet changes when you draw a 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. But if the picture is drawn with colours, the change cannot be reversed.
Question 5.Give example to explain the difference between changes that can or cannot be reversed.
Answer: Some changes can be reversed like:
(i)Filing glass with water
(ii)Opening/ closing door
Other changes cannot be reversed, like:
(iii)Curdling of milk
(iv)Ripening of fruit.
Question 6.A thick coating of paste of Plaster of Paris 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 plaster of Paris cannot be reversed.
Question 7.A bag of cement lying in the open gets wet due to rain during night. The next day the sun shines brightly. Do you think the change which have occurred in the cement could be reversed?
Answer: No, the changes which have occurred in the cement cannot be reversed.

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