Science Class 6 – Chapter 6 – Changes Around Us – NCERT Exercise Solutions (Question-Answer)

Science Class 6 – Chapter 6 – Changes Around Us – NCERT Exercise Solutions (Question-Answer) is provided below. Total 7 Questions are in this NCERT Chapter Exercise, all are solved here.

Exercises

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

Answer: Yes, this change can be reversed.

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

Answer: No, the change cannot be reversed.

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.

S.No.                  ChangeCan be reversed ( Yes/No)
1The sawing of a piece of wood 
2The melting of ice candy 
3Dissolving sugar in water 
4The cooking of food 
5The ripening of a mango 
6Souring of milk 

Answer :-

S.No.                  ChangeCan be reversed ( Yes/No)
1The sawing of a piece of woodNo
2The melting of ice candyYes
3Dissolving sugar in waterYes
4The cooking of foodNo
5The ripening of a mangoNo
6Souring of milkNo

Q4. A drawing sheet changes when you draw a picture on it. Can you reverse this change?

Answer:  No, the change can not be reversed once we draw a picture on the drawing sheet with a pen or colour. But this change can be reversed if we used a pencil to draw the picture.

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

Answer:

Examples of changes that can be reversed-

  • Filling the balloon with air.
  • Melting of Wax
  • Melting of coal tar
  • Melting of Ice
  • Knitting of sweater

 Examples of change that cannot be reversed-

  • Bursting of balloon
  • Burning of Candle.
  • Ripening of fruits/vegetables.
  • Burning of paper.
  • Milk to Curd

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 changes in POP be reversed?

Answer: No, the changes of Plaster of Paris cannot be reversed.

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 occurs in the cement, could be reversed? 

Answer: No, the changes cannot be reversed.

Science class 6 – Chapter 6 – Changes Around Us – NCERT Exercise Solutions (Question-Answer) ended👍👍👍

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