NCERT Class 6 Science – Changes Around Us Chapter 6 Question Answer for Preparation of Exams. Here we Provide Class 6 Vigyan Question Answer, Important Questions, for Various State Boards Students like CBSE, Haryana, uttar pradesh, mp and other state students.
Also Read : – Class 6 Science NCERT Solution
NCERT Class 6 Science Chapter 6 Changes Around Us Question Answer ( अभ्यास के प्रश्न उत्तर ) Solution.
Changes Around Us Class 6 Science Chapter 6 Question Answer
Textual Questions and Answer for Easy to Understand the Chapter of Science.
Q.1. To walk through a waterlogged area, you usually shorten the length of your dress by folding it. Can this change be reversed ?
Ans. Yes, it can be reversed by unfolding the folded clothes.
Q. 2. You accidentally dropped your favourite toy and broke it.
This is a change you did not want. Can this change be reversed ?
Ans. No, it cannot be reversed.
Q. 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.||Change||Can be reversed|
|The sawing of a piece of wood.|
The melting of ice candy.
Dissolving sugar in water.
The cooking of food.
The ripening of a mango.
Souring of milk.
Ans. (1) No (2) Yes (3) Yes (4) No (5) No (6) No.
Q. 4. A drawing sheet changes when your draw a picture on it. Can you reverse this change ?
Ans. No, we cannot reverse this change. It is because when we draw pictures with ink and paint / colours the change produced is permanent. On the other hand if we draw picture with a pencil then the change produced can be reversed by rubbing it with eraser.
Q.5. Give examples to explain the difference between changes that can or cannot be reversed.
Ans. Reversible Changes:- The changes which can be reversed :
(a) Melting of ice cream
(b) Liquid changing into vapours
(c) Solid changing into liquid.
(a) Melted ice cream can be changed to solid ice cream by placing in freezer.
(b) Vapours can be changed to liquid by cooling.
(c) Liquid can be changed to solid by freezing.
Irreversible Changes :
(1) Souring of milk cannot be reversed.
(2) Burning of wood cannot be reversed.
(3) Making curd from milk.
Q. 6. A thick coating of a 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 ?
Ans. No, once the POP hardens, it cannot be changed to powder form again. So to say the change is irreversible.
Q. 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 that the changes, which have occurred in the cement, could be reversed ?
Ans. No, the wet cement becomes hard on placing in the sun and cannot be changed to original powdered form.