NCERT Solutions for Class 6 Science Chapter 6 Changes Around Us in English Medium or Hindi Medium free to download in PDF format for the academic year 2022-23 based on new NCERT Books. Key points and description of questions are given in Video Format based on latest NCERT Books for 2022-2023. Download Class 6 NCERT Solutions Apps for all subject in English and Hindi for offline use.
NCERT Solutions for Class 6 Science Chapter 6
|Chapter 6:||Changes Around Us|
Class 6 Science Chapter 6 Answers
6 Science Chapter 6 Important Questions for Practice
1. Iron rim is made slightly smaller than the wooden wheel. The rim is usually heated before fixing into the wooden wheel, because on heating the iron rim
(a) expands and fits onto the wooden wheel.
(b) contracts and fits onto the wooden wheel.
(c) no change in the size takes place.
(d) expands first, then on cooling contracts and fits onto the wooden wheel.
2. An iron ring is heated. Which of the following statement about it is incorrect?
(a) The ring expands.
(b) The ring almost comes to the same size on cooling.
(c) The change in this case is reversed.
(d) The ring changes its shape and the change cannot be reversed.
3. Pick the change that can be reversed from the following
(a) Cutting of trees
(b) Melting of ghee
(c) Burning of candle
(d) Blooming of flower
4. While lighting a candle, Paheli observed the following changes
(i) Wax was melting.
(ii) Candle was burning.
(iii) Size of the candle was reducing.
(iv) Melted wax was getting solidified.
5. Rolling of chapati and baking of chapati are the changes that
(a) can be reversed.
(b) cannot be reversed.
(c) can be reversed and cannot be reversed, respectively.
(d) cannot be reversed and can be reversed, respectively.
6. Which of the following change cannot be reversed?
(a) Hardening of cement (b) Freezing of ice cream (c) Opening a door (d) Melting of chocolate
7. Salt can be separated from its solution (salt dissolved in water), because
(a) mixing of salt in water is a change that can be reversed by heating and melting of salt.
(b) mixing of salt in water is a change that cannot be reversed.
(c) mixing of salt in water is a permanent change.
(d) mixing of salt in water is a change that can be reversed by evaporation.
Answers of Important Questions
All answers are done properly based on new CBSE Syllabus and following the latest NCERT Books.
Important Questions on Class 6 Science Chapter 6
To walk through a waterlogged area, you usually shorten the length of your dress by folding it. Can this change be reversed?
Yes, by unfolding the dress this change can be reversed.
Give examples to explain the difference between changes that can or cannot be reversed.
Examples of Reversible Changes: Melting of Ice into water. By freezing the water we can obtain ice again. Folding a paper: By unfolding it, we can undo the change. Hot milk to cold milk: By boiling milk, we can make it warm. Example of Irreversible Changes: Burning of candle. Bursting of crackers. Cutting of trees.
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?
When water is added to POP, it undergoes a chemical change. Its composition changes and is converted into another substance. Since it is a chemical change, so it cannot be reversed.