NCERT Solutions for Class 6 Science Chapter 6 Changes Around Us

Written by Team Trustudies
Updated at 2021-03-08

NCERT solutions for class 6 Science Chapter 6 Changes Around Us Exercise

Q1 ) To walk through a waterlogged area, you usually shorten the length of your dress by folding it. Can this change be reversed?

NCERT Solutions for Class 6 Science Chapter 6 Changes Around Us

Yes, it can be reversed. The way we folded it and made dress smaller, the same way dress can be opened and enlarged.

Q2 ) You accidentally dropped your favourite toy and broke it. This is a change you did not want. Can this change be reversed?

NCERT Solutions for Class 6 Science Chapter 6 Changes Around Us

No, this change can't be reversed because I can't add that toy back because the breakdown of the toy is an irreversible change.

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.

NCERT Solutions for Class 6 Science Chapter 6 Changes Around Us

Sl No. Chang. 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?

NCERT Solutions for Class 6 Science Chapter 6 Changes Around Us

In drawing used only pencil then we can reversed this change. We cannot reverse this change if in this drawing used pen or paint.

Q5 ) Give examples to explain the difference between changes that can or cannot be reversed.

NCERT Solutions for Class 6 Science Chapter 6 Changes Around Us

(A) Changes that can be reversed:

(I) Writing with a pencil.
(II) Switch on or off of the fan.

(B) Changes then can not be reversed:

(I) Writing with a pen.
(II) Making curd from milk.

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 change in POP be reversed?

NCERT Solutions for Class 6 Science Chapter 6 Changes Around Us

No, this change cannot be reversed because getting it back is an irreversible change or a chemical change.

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 occurred in the cement, could be reversed?

NCERT Solutions for Class 6 Science Chapter 6 Changes Around Us