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Changes Around Us

Class 6th Science CBSE Solution
Exercise
  1. To walk through a waterlogged area, you usually shorten the length of your dress by…
  2. You accidentally dropped your favourite toy and broke it. This is a change you did not…
  3. Some changes are listed in the following table. For each change, write in the blank column…
  4. A drawing sheet changes when you draw a picture on it. Can you reverse this change?…
  5. Give few examples to explain the difference between changes that can or cannot be…
  6. A thick coating of a paste of Plaster of Paris (POP) is applied over the bandage on a…
  7. A bag of cement lying in the open gets wet due to rain during the night. The next day the…
Exercise
Question 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. Folding of dress can be reversed as you can unfold it later.
Question 2.

You accidentally dropped your favourite toy and broke it. This is a change you did not want. Can this change be reversed?
Answer:

No. This 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.
Answer:




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 colours, the change cannot be reversed while if it is drawn with a pencil, it can be erased and hence can be reversed.
Question 5.

Give few examples to explain the difference between changes that can or cannot be reversed.
Answer:

Following are the examples of changes that can be reversed:

(i) Drawing a picture with a pencil.


(i) Filling glass with juice.


(ii) Opening and closing of window.


Following are the examples of changes that cannot be reversed


(i) Curding of milk.


(ii) Ripening of fruit.
Question 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. This change cannot be reversed because it is irreversible chemical change.
Question 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. The changes occurred in the cement cannot be reversed.